godot-docs/classes/class_springbonesimulator3d.rst

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.. _class_SpringBoneSimulator3D:

SpringBoneSimulator3D
=====================

**Inherits:** :ref:`SkeletonModifier3D<class_SkeletonModifier3D>` **<** :ref:`Node3D<class_Node3D>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

A :ref:`SkeletonModifier3D<class_SkeletonModifier3D>` to apply inertial wavering to bone chains.

.. rst-class:: classref-introduction-group

Description
-----------

This :ref:`SkeletonModifier3D<class_SkeletonModifier3D>` can be used to wiggle hair, cloth, and tails. This modifier behaves differently from :ref:`PhysicalBoneSimulator3D<class_PhysicalBoneSimulator3D>` as it attempts to return the original pose after modification.

If you setup :ref:`set_root_bone()<class_SpringBoneSimulator3D_method_set_root_bone>` and :ref:`set_end_bone()<class_SpringBoneSimulator3D_method_set_end_bone>`, it is treated as one bone chain. Note that it does not support a branched chain like Y-shaped chains.

When a bone chain is created, an array is generated from the bones that exist in between and listed in the joint list.

Several properties can be applied to each joint, such as :ref:`set_joint_stiffness()<class_SpringBoneSimulator3D_method_set_joint_stiffness>`, :ref:`set_joint_drag()<class_SpringBoneSimulator3D_method_set_joint_drag>`, and :ref:`set_joint_gravity()<class_SpringBoneSimulator3D_method_set_joint_gravity>`.

For simplicity, you can set values to all joints at the same time by using a :ref:`Curve<class_Curve>`. If you want to specify detailed values individually, set :ref:`set_individual_config()<class_SpringBoneSimulator3D_method_set_individual_config>` to ``true``.

For physical simulation, **SpringBoneSimulator3D** can have children as self-standing collisions that are not related to :ref:`PhysicsServer3D<class_PhysicsServer3D>`, see also :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>`.

\ **Warning:** A scaled **SpringBoneSimulator3D** will likely not behave as expected. Make sure that the parent :ref:`Skeleton3D<class_Skeleton3D>` and its bones are not scaled.

.. rst-class:: classref-reftable-group

Properties
----------

.. table::
   :widths: auto

   +-------------------------------+----------------------------------------------------------------------------------+----------------------+
   | :ref:`Vector3<class_Vector3>` | :ref:`external_force<class_SpringBoneSimulator3D_property_external_force>`       | ``Vector3(0, 0, 0)`` |
   +-------------------------------+----------------------------------------------------------------------------------+----------------------+
   | :ref:`bool<class_bool>`       | :ref:`mutable_bone_axes<class_SpringBoneSimulator3D_property_mutable_bone_axes>` | ``true``             |
   +-------------------------------+----------------------------------------------------------------------------------+----------------------+
   | :ref:`int<class_int>`         | :ref:`setting_count<class_SpringBoneSimulator3D_property_setting_count>`         | ``0``                |
   +-------------------------------+----------------------------------------------------------------------------------+----------------------+

.. rst-class:: classref-reftable-group

Methods
-------

.. table::
   :widths: auto

   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`                                     | :ref:`are_all_child_collisions_enabled<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`clear_collisions<class_SpringBoneSimulator3D_method_clear_collisions>`\ (\ index\: :ref:`int<class_int>`\ )                                                                                                                |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`clear_exclude_collisions<class_SpringBoneSimulator3D_method_clear_exclude_collisions>`\ (\ index\: :ref:`int<class_int>`\ )                                                                                                |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`clear_settings<class_SpringBoneSimulator3D_method_clear_settings>`\ (\ )                                                                                                                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_center_bone<class_SpringBoneSimulator3D_method_get_center_bone>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                                 | :ref:`get_center_bone_name<class_SpringBoneSimulator3D_method_get_center_bone_name>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>`    | :ref:`get_center_from<class_SpringBoneSimulator3D_method_get_center_from>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`NodePath<class_NodePath>`                             | :ref:`get_center_node<class_SpringBoneSimulator3D_method_get_center_node>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_collision_count<class_SpringBoneSimulator3D_method_get_collision_count>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                  |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`NodePath<class_NodePath>`                             | :ref:`get_collision_path<class_SpringBoneSimulator3D_method_get_collision_path>`\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`\ ) |const|                                                                 |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_drag<class_SpringBoneSimulator3D_method_get_drag>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Curve<class_Curve>`                                   | :ref:`get_drag_damping_curve<class_SpringBoneSimulator3D_method_get_drag_damping_curve>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                            |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_end_bone<class_SpringBoneSimulator3D_method_get_end_bone>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                                |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`BoneDirection<enum_SkeletonModifier3D_BoneDirection>` | :ref:`get_end_bone_direction<class_SpringBoneSimulator3D_method_get_end_bone_direction>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                            |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_end_bone_length<class_SpringBoneSimulator3D_method_get_end_bone_length>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                  |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                                 | :ref:`get_end_bone_name<class_SpringBoneSimulator3D_method_get_end_bone_name>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                      |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_exclude_collision_count<class_SpringBoneSimulator3D_method_get_exclude_collision_count>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                  |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`NodePath<class_NodePath>`                             | :ref:`get_exclude_collision_path<class_SpringBoneSimulator3D_method_get_exclude_collision_path>`\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`\ ) |const|                                                 |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_gravity<class_SpringBoneSimulator3D_method_get_gravity>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                                  |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Curve<class_Curve>`                                   | :ref:`get_gravity_damping_curve<class_SpringBoneSimulator3D_method_get_gravity_damping_curve>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                      |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>`                               | :ref:`get_gravity_direction<class_SpringBoneSimulator3D_method_get_gravity_direction>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                              |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_joint_bone<class_SpringBoneSimulator3D_method_get_joint_bone>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                                             |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                                 | :ref:`get_joint_bone_name<class_SpringBoneSimulator3D_method_get_joint_bone_name>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_joint_count<class_SpringBoneSimulator3D_method_get_joint_count>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_joint_drag<class_SpringBoneSimulator3D_method_get_joint_drag>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                                             |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_joint_gravity<class_SpringBoneSimulator3D_method_get_joint_gravity>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                                       |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>`                               | :ref:`get_joint_gravity_direction<class_SpringBoneSimulator3D_method_get_joint_gravity_direction>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_joint_radius<class_SpringBoneSimulator3D_method_get_joint_radius>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                                         |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>`   | :ref:`get_joint_rotation_axis<class_SpringBoneSimulator3D_method_get_joint_rotation_axis>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                           |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>`                               | :ref:`get_joint_rotation_axis_vector<class_SpringBoneSimulator3D_method_get_joint_rotation_axis_vector>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                             |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_joint_stiffness<class_SpringBoneSimulator3D_method_get_joint_stiffness>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const|                                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_radius<class_SpringBoneSimulator3D_method_get_radius>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                                    |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Curve<class_Curve>`                                   | :ref:`get_radius_damping_curve<class_SpringBoneSimulator3D_method_get_radius_damping_curve>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                                       | :ref:`get_root_bone<class_SpringBoneSimulator3D_method_get_root_bone>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                              |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                                 | :ref:`get_root_bone_name<class_SpringBoneSimulator3D_method_get_root_bone_name>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                    |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>`   | :ref:`get_rotation_axis<class_SpringBoneSimulator3D_method_get_rotation_axis>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                      |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Vector3<class_Vector3>`                               | :ref:`get_rotation_axis_vector<class_SpringBoneSimulator3D_method_get_rotation_axis_vector>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`                                   | :ref:`get_stiffness<class_SpringBoneSimulator3D_method_get_stiffness>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                              |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Curve<class_Curve>`                                   | :ref:`get_stiffness_damping_curve<class_SpringBoneSimulator3D_method_get_stiffness_damping_curve>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                  |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`                                     | :ref:`is_config_individual<class_SpringBoneSimulator3D_method_is_config_individual>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>`                                     | :ref:`is_end_bone_extended<class_SpringBoneSimulator3D_method_is_end_bone_extended>`\ (\ index\: :ref:`int<class_int>`\ ) |const|                                                                                                |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`reset<class_SpringBoneSimulator3D_method_reset>`\ (\ )                                                                                                                                                                     |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_center_bone<class_SpringBoneSimulator3D_method_set_center_bone>`\ (\ index\: :ref:`int<class_int>`, bone\: :ref:`int<class_int>`\ )                                                                                    |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_center_bone_name<class_SpringBoneSimulator3D_method_set_center_bone_name>`\ (\ index\: :ref:`int<class_int>`, bone_name\: :ref:`String<class_String>`\ )                                                               |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_center_from<class_SpringBoneSimulator3D_method_set_center_from>`\ (\ index\: :ref:`int<class_int>`, center_from\: :ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>`\ )                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_center_node<class_SpringBoneSimulator3D_method_set_center_node>`\ (\ index\: :ref:`int<class_int>`, node_path\: :ref:`NodePath<class_NodePath>`\ )                                                                     |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_collision_count<class_SpringBoneSimulator3D_method_set_collision_count>`\ (\ index\: :ref:`int<class_int>`, count\: :ref:`int<class_int>`\ )                                                                           |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_collision_path<class_SpringBoneSimulator3D_method_set_collision_path>`\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`, node_path\: :ref:`NodePath<class_NodePath>`\ )                            |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_drag<class_SpringBoneSimulator3D_method_set_drag>`\ (\ index\: :ref:`int<class_int>`, drag\: :ref:`float<class_float>`\ )                                                                                              |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_drag_damping_curve<class_SpringBoneSimulator3D_method_set_drag_damping_curve>`\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ )                                                                 |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_enable_all_child_collisions<class_SpringBoneSimulator3D_method_set_enable_all_child_collisions>`\ (\ index\: :ref:`int<class_int>`, enabled\: :ref:`bool<class_bool>`\ )                                               |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_end_bone<class_SpringBoneSimulator3D_method_set_end_bone>`\ (\ index\: :ref:`int<class_int>`, bone\: :ref:`int<class_int>`\ )                                                                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_end_bone_direction<class_SpringBoneSimulator3D_method_set_end_bone_direction>`\ (\ index\: :ref:`int<class_int>`, bone_direction\: :ref:`BoneDirection<enum_SkeletonModifier3D_BoneDirection>`\ )                      |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_end_bone_length<class_SpringBoneSimulator3D_method_set_end_bone_length>`\ (\ index\: :ref:`int<class_int>`, length\: :ref:`float<class_float>`\ )                                                                      |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_end_bone_name<class_SpringBoneSimulator3D_method_set_end_bone_name>`\ (\ index\: :ref:`int<class_int>`, bone_name\: :ref:`String<class_String>`\ )                                                                     |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_exclude_collision_count<class_SpringBoneSimulator3D_method_set_exclude_collision_count>`\ (\ index\: :ref:`int<class_int>`, count\: :ref:`int<class_int>`\ )                                                           |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_exclude_collision_path<class_SpringBoneSimulator3D_method_set_exclude_collision_path>`\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`, node_path\: :ref:`NodePath<class_NodePath>`\ )            |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_extend_end_bone<class_SpringBoneSimulator3D_method_set_extend_end_bone>`\ (\ index\: :ref:`int<class_int>`, enabled\: :ref:`bool<class_bool>`\ )                                                                       |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_gravity<class_SpringBoneSimulator3D_method_set_gravity>`\ (\ index\: :ref:`int<class_int>`, gravity\: :ref:`float<class_float>`\ )                                                                                     |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_gravity_damping_curve<class_SpringBoneSimulator3D_method_set_gravity_damping_curve>`\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ )                                                           |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_gravity_direction<class_SpringBoneSimulator3D_method_set_gravity_direction>`\ (\ index\: :ref:`int<class_int>`, gravity_direction\: :ref:`Vector3<class_Vector3>`\ )                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_individual_config<class_SpringBoneSimulator3D_method_set_individual_config>`\ (\ index\: :ref:`int<class_int>`, enabled\: :ref:`bool<class_bool>`\ )                                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_drag<class_SpringBoneSimulator3D_method_set_joint_drag>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, drag\: :ref:`float<class_float>`\ )                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_gravity<class_SpringBoneSimulator3D_method_set_joint_gravity>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, gravity\: :ref:`float<class_float>`\ )                                          |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_gravity_direction<class_SpringBoneSimulator3D_method_set_joint_gravity_direction>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, gravity_direction\: :ref:`Vector3<class_Vector3>`\ )        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_radius<class_SpringBoneSimulator3D_method_set_joint_radius>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, radius\: :ref:`float<class_float>`\ )                                             |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_rotation_axis<class_SpringBoneSimulator3D_method_set_joint_rotation_axis>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, axis\: :ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>`\ ) |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_rotation_axis_vector<class_SpringBoneSimulator3D_method_set_joint_rotation_axis_vector>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, vector\: :ref:`Vector3<class_Vector3>`\ )             |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_joint_stiffness<class_SpringBoneSimulator3D_method_set_joint_stiffness>`\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, stiffness\: :ref:`float<class_float>`\ )                                    |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_radius<class_SpringBoneSimulator3D_method_set_radius>`\ (\ index\: :ref:`int<class_int>`, radius\: :ref:`float<class_float>`\ )                                                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_radius_damping_curve<class_SpringBoneSimulator3D_method_set_radius_damping_curve>`\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ )                                                             |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_root_bone<class_SpringBoneSimulator3D_method_set_root_bone>`\ (\ index\: :ref:`int<class_int>`, bone\: :ref:`int<class_int>`\ )                                                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_root_bone_name<class_SpringBoneSimulator3D_method_set_root_bone_name>`\ (\ index\: :ref:`int<class_int>`, bone_name\: :ref:`String<class_String>`\ )                                                                   |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_rotation_axis<class_SpringBoneSimulator3D_method_set_rotation_axis>`\ (\ index\: :ref:`int<class_int>`, axis\: :ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>`\ )                                            |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_rotation_axis_vector<class_SpringBoneSimulator3D_method_set_rotation_axis_vector>`\ (\ index\: :ref:`int<class_int>`, vector\: :ref:`Vector3<class_Vector3>`\ )                                                        |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_stiffness<class_SpringBoneSimulator3D_method_set_stiffness>`\ (\ index\: :ref:`int<class_int>`, stiffness\: :ref:`float<class_float>`\ )                                                                               |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |void|                                                      | :ref:`set_stiffness_damping_curve<class_SpringBoneSimulator3D_method_set_stiffness_damping_curve>`\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ )                                                       |
   +-------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Enumerations
------------

.. _enum_SpringBoneSimulator3D_CenterFrom:

.. rst-class:: classref-enumeration

enum **CenterFrom**: :ref:`🔗<enum_SpringBoneSimulator3D_CenterFrom>`

.. _class_SpringBoneSimulator3D_constant_CENTER_FROM_WORLD_ORIGIN:

.. rst-class:: classref-enumeration-constant

:ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>` **CENTER_FROM_WORLD_ORIGIN** = ``0``

The world origin is defined as center.

.. _class_SpringBoneSimulator3D_constant_CENTER_FROM_NODE:

.. rst-class:: classref-enumeration-constant

:ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>` **CENTER_FROM_NODE** = ``1``

The :ref:`Node3D<class_Node3D>` specified by :ref:`set_center_node()<class_SpringBoneSimulator3D_method_set_center_node>` is defined as center.

If :ref:`Node3D<class_Node3D>` is not found, the parent :ref:`Skeleton3D<class_Skeleton3D>` is treated as center.

.. _class_SpringBoneSimulator3D_constant_CENTER_FROM_BONE:

.. rst-class:: classref-enumeration-constant

:ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>` **CENTER_FROM_BONE** = ``2``

The bone pose origin of the parent :ref:`Skeleton3D<class_Skeleton3D>` specified by :ref:`set_center_bone()<class_SpringBoneSimulator3D_method_set_center_bone>` is defined as center.

If :ref:`Node3D<class_Node3D>` is not found, the parent :ref:`Skeleton3D<class_Skeleton3D>` is treated as center.

.. rst-class:: classref-section-separator

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.. rst-class:: classref-descriptions-group

Property Descriptions
---------------------

.. _class_SpringBoneSimulator3D_property_external_force:

.. rst-class:: classref-property

:ref:`Vector3<class_Vector3>` **external_force** = ``Vector3(0, 0, 0)`` :ref:`🔗<class_SpringBoneSimulator3D_property_external_force>`

.. rst-class:: classref-property-setget

- |void| **set_external_force**\ (\ value\: :ref:`Vector3<class_Vector3>`\ )
- :ref:`Vector3<class_Vector3>` **get_external_force**\ (\ )

The constant force that always affected bones. It is equal to the result when the parent :ref:`Skeleton3D<class_Skeleton3D>` moves at this speed in the opposite direction.

This is useful for effects such as wind and anti-gravity.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_property_mutable_bone_axes:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **mutable_bone_axes** = ``true`` :ref:`🔗<class_SpringBoneSimulator3D_property_mutable_bone_axes>`

.. rst-class:: classref-property-setget

- |void| **set_mutable_bone_axes**\ (\ value\: :ref:`bool<class_bool>`\ )
- :ref:`bool<class_bool>` **are_bone_axes_mutable**\ (\ )

If ``true``, the solver retrieves the bone axis from the bone pose every frame.

If ``false``, the solver retrieves the bone axis from the bone rest and caches it, which increases performance slightly, but position changes in the bone pose made before processing this **SpringBoneSimulator3D** are ignored.

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.. _class_SpringBoneSimulator3D_property_setting_count:

.. rst-class:: classref-property

:ref:`int<class_int>` **setting_count** = ``0`` :ref:`🔗<class_SpringBoneSimulator3D_property_setting_count>`

.. rst-class:: classref-property-setget

- |void| **set_setting_count**\ (\ value\: :ref:`int<class_int>`\ )
- :ref:`int<class_int>` **get_setting_count**\ (\ )

The number of settings.

.. rst-class:: classref-section-separator

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.. rst-class:: classref-descriptions-group

Method Descriptions
-------------------

.. _class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **are_all_child_collisions_enabled**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>`

Returns ``true`` if all child :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>`\ s are contained in the collision list at ``index`` in the settings.

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.. _class_SpringBoneSimulator3D_method_clear_collisions:

.. rst-class:: classref-method

|void| **clear_collisions**\ (\ index\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_clear_collisions>`

Clears all collisions from the collision list at ``index`` in the settings when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``false``.

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.. _class_SpringBoneSimulator3D_method_clear_exclude_collisions:

.. rst-class:: classref-method

|void| **clear_exclude_collisions**\ (\ index\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_clear_exclude_collisions>`

Clears all exclude collisions from the collision list at ``index`` in the settings when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_clear_settings:

.. rst-class:: classref-method

|void| **clear_settings**\ (\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_clear_settings>`

Clears all settings.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_center_bone:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_center_bone**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_center_bone>`

Returns the center bone index of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_center_bone_name:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_center_bone_name**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_center_bone_name>`

Returns the center bone name of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_center_from:

.. rst-class:: classref-method

:ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>` **get_center_from**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_center_from>`

Returns what the center originates from in the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_center_node:

.. rst-class:: classref-method

:ref:`NodePath<class_NodePath>` **get_center_node**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_center_node>`

Returns the center node path of the bone chain.

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.. _class_SpringBoneSimulator3D_method_get_collision_count:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_collision_count**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_collision_count>`

Returns the collision count of the bone chain's collision list when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``false``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_collision_path:

.. rst-class:: classref-method

:ref:`NodePath<class_NodePath>` **get_collision_path**\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_collision_path>`

Returns the node path of the :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>` at ``collision`` in the bone chain's collision list when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``false``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_drag:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_drag**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_drag>`

Returns the drag force damping curve of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_drag_damping_curve:

.. rst-class:: classref-method

:ref:`Curve<class_Curve>` **get_drag_damping_curve**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_drag_damping_curve>`

Returns the drag force damping curve of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_end_bone:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_end_bone**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_end_bone>`

Returns the end bone index of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_end_bone_direction:

.. rst-class:: classref-method

:ref:`BoneDirection<enum_SkeletonModifier3D_BoneDirection>` **get_end_bone_direction**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_end_bone_direction>`

Returns the tail direction of the end bone of the bone chain when :ref:`is_end_bone_extended()<class_SpringBoneSimulator3D_method_is_end_bone_extended>` is ``true``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_end_bone_length:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_end_bone_length**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_end_bone_length>`

Returns the end bone tail length of the bone chain when :ref:`is_end_bone_extended()<class_SpringBoneSimulator3D_method_is_end_bone_extended>` is ``true``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_end_bone_name:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_end_bone_name**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_end_bone_name>`

Returns the end bone name of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_exclude_collision_count:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_exclude_collision_count**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_exclude_collision_count>`

Returns the exclude collision count of the bone chain's exclude collision list when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``true``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_exclude_collision_path:

.. rst-class:: classref-method

:ref:`NodePath<class_NodePath>` **get_exclude_collision_path**\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_exclude_collision_path>`

Returns the node path of the :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>` at ``collision`` in the bone chain's exclude collision list when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``true``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_gravity:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_gravity**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_gravity>`

Returns the gravity amount of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_gravity_damping_curve:

.. rst-class:: classref-method

:ref:`Curve<class_Curve>` **get_gravity_damping_curve**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_gravity_damping_curve>`

Returns the gravity amount damping curve of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_gravity_direction:

.. rst-class:: classref-method

:ref:`Vector3<class_Vector3>` **get_gravity_direction**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_gravity_direction>`

Returns the gravity direction of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_bone:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_joint_bone**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_bone>`

Returns the bone index at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_bone_name:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_joint_bone_name**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_bone_name>`

Returns the bone name at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_count:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_joint_count**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_count>`

Returns the joint count of the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_drag:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_joint_drag**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_drag>`

Returns the drag force at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_gravity:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_joint_gravity**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_gravity>`

Returns the gravity amount at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

----

.. _class_SpringBoneSimulator3D_method_get_joint_gravity_direction:

.. rst-class:: classref-method

:ref:`Vector3<class_Vector3>` **get_joint_gravity_direction**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_gravity_direction>`

Returns the gravity direction at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_radius:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_joint_radius**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_radius>`

Returns the radius at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_rotation_axis:

.. rst-class:: classref-method

:ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>` **get_joint_rotation_axis**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_rotation_axis>`

Returns the rotation axis at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_rotation_axis_vector:

.. rst-class:: classref-method

:ref:`Vector3<class_Vector3>` **get_joint_rotation_axis_vector**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_rotation_axis_vector>`

Returns the rotation axis vector for the specified joint in the bone chain. This vector represents the axis around which the joint can rotate. It is determined based on the rotation axis set for the joint.

If :ref:`get_joint_rotation_axis()<class_SpringBoneSimulator3D_method_get_joint_rotation_axis>` is :ref:`SkeletonModifier3D.ROTATION_AXIS_ALL<class_SkeletonModifier3D_constant_ROTATION_AXIS_ALL>`, this method returns ``Vector3(0, 0, 0)``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_joint_stiffness:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_joint_stiffness**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_joint_stiffness>`

Returns the stiffness force at ``joint`` in the bone chain's joint list.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_radius:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_radius**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_radius>`

Returns the joint radius of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_radius_damping_curve:

.. rst-class:: classref-method

:ref:`Curve<class_Curve>` **get_radius_damping_curve**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_radius_damping_curve>`

Returns the joint radius damping curve of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_root_bone:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_root_bone**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_root_bone>`

Returns the root bone index of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_root_bone_name:

.. rst-class:: classref-method

:ref:`String<class_String>` **get_root_bone_name**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_root_bone_name>`

Returns the root bone name of the bone chain.

.. rst-class:: classref-item-separator

----

.. _class_SpringBoneSimulator3D_method_get_rotation_axis:

.. rst-class:: classref-method

:ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>` **get_rotation_axis**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_rotation_axis>`

Returns the rotation axis of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_rotation_axis_vector:

.. rst-class:: classref-method

:ref:`Vector3<class_Vector3>` **get_rotation_axis_vector**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_rotation_axis_vector>`

Returns the rotation axis vector of the bone chain. This vector represents the axis around which the bone chain can rotate. It is determined based on the rotation axis set for the bone chain.

If :ref:`get_rotation_axis()<class_SpringBoneSimulator3D_method_get_rotation_axis>` is :ref:`SkeletonModifier3D.ROTATION_AXIS_ALL<class_SkeletonModifier3D_constant_ROTATION_AXIS_ALL>`, this method returns ``Vector3(0, 0, 0)``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_stiffness:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_stiffness**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_stiffness>`

Returns the stiffness force of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_get_stiffness_damping_curve:

.. rst-class:: classref-method

:ref:`Curve<class_Curve>` **get_stiffness_damping_curve**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_get_stiffness_damping_curve>`

Returns the stiffness force damping curve of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_is_config_individual:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_config_individual**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_is_config_individual>`

Returns ``true`` if the config can be edited individually for each joint.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_is_end_bone_extended:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **is_end_bone_extended**\ (\ index\: :ref:`int<class_int>`\ ) |const| :ref:`🔗<class_SpringBoneSimulator3D_method_is_end_bone_extended>`

Returns ``true`` if the end bone is extended to have a tail.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_reset:

.. rst-class:: classref-method

|void| **reset**\ (\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_reset>`

Resets a simulating state with respect to the current bone pose.

It is useful to prevent the simulation result getting violent. For example, calling this immediately after a call to :ref:`AnimationPlayer.play()<class_AnimationPlayer_method_play>` without a fading, or within the previous :ref:`SkeletonModifier3D.modification_processed<class_SkeletonModifier3D_signal_modification_processed>` signal if it's condition changes significantly.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_set_center_bone:

.. rst-class:: classref-method

|void| **set_center_bone**\ (\ index\: :ref:`int<class_int>`, bone\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_center_bone>`

Sets the center bone index of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_set_center_bone_name:

.. rst-class:: classref-method

|void| **set_center_bone_name**\ (\ index\: :ref:`int<class_int>`, bone_name\: :ref:`String<class_String>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_center_bone_name>`

Sets the center bone name of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_set_center_from:

.. rst-class:: classref-method

|void| **set_center_from**\ (\ index\: :ref:`int<class_int>`, center_from\: :ref:`CenterFrom<enum_SpringBoneSimulator3D_CenterFrom>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_center_from>`

Sets what the center originates from in the bone chain.

Bone movement is calculated based on the difference in relative distance between center and bone in the previous and next frames.

For example, if the parent :ref:`Skeleton3D<class_Skeleton3D>` is used as the center, the bones are considered to have not moved if the :ref:`Skeleton3D<class_Skeleton3D>` moves in the world.

In this case, only a change in the bone pose is considered to be a bone movement.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_set_center_node:

.. rst-class:: classref-method

|void| **set_center_node**\ (\ index\: :ref:`int<class_int>`, node_path\: :ref:`NodePath<class_NodePath>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_center_node>`

Sets the center node path of the bone chain.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_set_collision_count:

.. rst-class:: classref-method

|void| **set_collision_count**\ (\ index\: :ref:`int<class_int>`, count\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_collision_count>`

Sets the number of collisions in the collision list at ``index`` in the settings when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``false``.

.. rst-class:: classref-item-separator

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.. _class_SpringBoneSimulator3D_method_set_collision_path:

.. rst-class:: classref-method

|void| **set_collision_path**\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`, node_path\: :ref:`NodePath<class_NodePath>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_collision_path>`

Sets the node path of the :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>` at ``collision`` in the bone chain's collision list when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``false``.

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.. _class_SpringBoneSimulator3D_method_set_drag:

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|void| **set_drag**\ (\ index\: :ref:`int<class_int>`, drag\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_drag>`

Sets the drag force of the bone chain. The greater the value, the more suppressed the wiggling.

The value is scaled by :ref:`set_drag_damping_curve()<class_SpringBoneSimulator3D_method_set_drag_damping_curve>` and cached in each joint setting in the joint list.

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.. _class_SpringBoneSimulator3D_method_set_drag_damping_curve:

.. rst-class:: classref-method

|void| **set_drag_damping_curve**\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_drag_damping_curve>`

Sets the drag force damping curve of the bone chain.

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.. _class_SpringBoneSimulator3D_method_set_enable_all_child_collisions:

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|void| **set_enable_all_child_collisions**\ (\ index\: :ref:`int<class_int>`, enabled\: :ref:`bool<class_bool>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_enable_all_child_collisions>`

If ``enabled`` is ``true``, all child :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>`\ s are colliding and :ref:`set_exclude_collision_path()<class_SpringBoneSimulator3D_method_set_exclude_collision_path>` is enabled as an exclusion list at ``index`` in the settings.

If ``enabled`` is ``false``, you need to manually register all valid collisions with :ref:`set_collision_path()<class_SpringBoneSimulator3D_method_set_collision_path>`.

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.. _class_SpringBoneSimulator3D_method_set_end_bone:

.. rst-class:: classref-method

|void| **set_end_bone**\ (\ index\: :ref:`int<class_int>`, bone\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_end_bone>`

Sets the end bone index of the bone chain.

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.. _class_SpringBoneSimulator3D_method_set_end_bone_direction:

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|void| **set_end_bone_direction**\ (\ index\: :ref:`int<class_int>`, bone_direction\: :ref:`BoneDirection<enum_SkeletonModifier3D_BoneDirection>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_end_bone_direction>`

Sets the end bone tail direction of the bone chain when :ref:`is_end_bone_extended()<class_SpringBoneSimulator3D_method_is_end_bone_extended>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_end_bone_length:

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|void| **set_end_bone_length**\ (\ index\: :ref:`int<class_int>`, length\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_end_bone_length>`

Sets the end bone tail length of the bone chain when :ref:`is_end_bone_extended()<class_SpringBoneSimulator3D_method_is_end_bone_extended>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_end_bone_name:

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|void| **set_end_bone_name**\ (\ index\: :ref:`int<class_int>`, bone_name\: :ref:`String<class_String>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_end_bone_name>`

Sets the end bone name of the bone chain.

\ **Note:** End bone must be the root bone or a child of the root bone. If they are the same, the tail must be extended by :ref:`set_extend_end_bone()<class_SpringBoneSimulator3D_method_set_extend_end_bone>` to jiggle the bone.

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.. _class_SpringBoneSimulator3D_method_set_exclude_collision_count:

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|void| **set_exclude_collision_count**\ (\ index\: :ref:`int<class_int>`, count\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_exclude_collision_count>`

Sets the number of exclude collisions in the exclude collision list at ``index`` in the settings when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_exclude_collision_path:

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|void| **set_exclude_collision_path**\ (\ index\: :ref:`int<class_int>`, collision\: :ref:`int<class_int>`, node_path\: :ref:`NodePath<class_NodePath>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_exclude_collision_path>`

Sets the node path of the :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>` at ``collision`` in the bone chain's exclude collision list when :ref:`are_all_child_collisions_enabled()<class_SpringBoneSimulator3D_method_are_all_child_collisions_enabled>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_extend_end_bone:

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|void| **set_extend_end_bone**\ (\ index\: :ref:`int<class_int>`, enabled\: :ref:`bool<class_bool>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_extend_end_bone>`

If ``enabled`` is ``true``, the end bone is extended to have a tail.

The extended tail config is allocated to the last element in the joint list. In other words, if you set ``enabled`` to ``false``, the config of the last element in the joint list has no effect in the simulated result.

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.. _class_SpringBoneSimulator3D_method_set_gravity:

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|void| **set_gravity**\ (\ index\: :ref:`int<class_int>`, gravity\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_gravity>`

Sets the gravity amount of the bone chain. This value is not an acceleration, but a constant velocity of movement in :ref:`set_gravity_direction()<class_SpringBoneSimulator3D_method_set_gravity_direction>`.

If ``gravity`` is not ``0``, the modified pose will not return to the original pose since it is always affected by gravity.

The value is scaled by :ref:`set_gravity_damping_curve()<class_SpringBoneSimulator3D_method_set_gravity_damping_curve>` and cached in each joint setting in the joint list.

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.. _class_SpringBoneSimulator3D_method_set_gravity_damping_curve:

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|void| **set_gravity_damping_curve**\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_gravity_damping_curve>`

Sets the gravity amount damping curve of the bone chain.

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.. _class_SpringBoneSimulator3D_method_set_gravity_direction:

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|void| **set_gravity_direction**\ (\ index\: :ref:`int<class_int>`, gravity_direction\: :ref:`Vector3<class_Vector3>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_gravity_direction>`

Sets the gravity direction of the bone chain. This value is internally normalized and then multiplied by :ref:`set_gravity()<class_SpringBoneSimulator3D_method_set_gravity>`.

The value is cached in each joint setting in the joint list.

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.. _class_SpringBoneSimulator3D_method_set_individual_config:

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|void| **set_individual_config**\ (\ index\: :ref:`int<class_int>`, enabled\: :ref:`bool<class_bool>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_individual_config>`

If ``enabled`` is ``true``, the config can be edited individually for each joint.

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.. _class_SpringBoneSimulator3D_method_set_joint_drag:

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|void| **set_joint_drag**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, drag\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_drag>`

Sets the drag force at ``joint`` in the bone chain's joint list when :ref:`is_config_individual()<class_SpringBoneSimulator3D_method_is_config_individual>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_joint_gravity:

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|void| **set_joint_gravity**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, gravity\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_gravity>`

Sets the gravity amount at ``joint`` in the bone chain's joint list when :ref:`is_config_individual()<class_SpringBoneSimulator3D_method_is_config_individual>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_joint_gravity_direction:

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|void| **set_joint_gravity_direction**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, gravity_direction\: :ref:`Vector3<class_Vector3>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_gravity_direction>`

Sets the gravity direction at ``joint`` in the bone chain's joint list when :ref:`is_config_individual()<class_SpringBoneSimulator3D_method_is_config_individual>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_joint_radius:

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|void| **set_joint_radius**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, radius\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_radius>`

Sets the joint radius at ``joint`` in the bone chain's joint list when :ref:`is_config_individual()<class_SpringBoneSimulator3D_method_is_config_individual>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_joint_rotation_axis:

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|void| **set_joint_rotation_axis**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, axis\: :ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_rotation_axis>`

Sets the rotation axis at ``joint`` in the bone chain's joint list when :ref:`is_config_individual()<class_SpringBoneSimulator3D_method_is_config_individual>` is ``true``.

The axes are based on the :ref:`Skeleton3D.get_bone_rest()<class_Skeleton3D_method_get_bone_rest>`'s space, if ``axis`` is :ref:`SkeletonModifier3D.ROTATION_AXIS_CUSTOM<class_SkeletonModifier3D_constant_ROTATION_AXIS_CUSTOM>`, you can specify any axis.

\ **Note:** The rotation axis and the forward vector shouldn't be colinear to avoid unintended rotation since **SpringBoneSimulator3D** does not factor in twisting forces.

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.. _class_SpringBoneSimulator3D_method_set_joint_rotation_axis_vector:

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|void| **set_joint_rotation_axis_vector**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, vector\: :ref:`Vector3<class_Vector3>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_rotation_axis_vector>`

Sets the rotation axis vector for the specified joint in the bone chain.

This vector is normalized by an internal process and represents the axis around which the bone chain can rotate.

If the vector length is ``0``, it is considered synonymous with :ref:`SkeletonModifier3D.ROTATION_AXIS_ALL<class_SkeletonModifier3D_constant_ROTATION_AXIS_ALL>`.

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.. _class_SpringBoneSimulator3D_method_set_joint_stiffness:

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|void| **set_joint_stiffness**\ (\ index\: :ref:`int<class_int>`, joint\: :ref:`int<class_int>`, stiffness\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_joint_stiffness>`

Sets the stiffness force at ``joint`` in the bone chain's joint list when :ref:`is_config_individual()<class_SpringBoneSimulator3D_method_is_config_individual>` is ``true``.

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.. _class_SpringBoneSimulator3D_method_set_radius:

.. rst-class:: classref-method

|void| **set_radius**\ (\ index\: :ref:`int<class_int>`, radius\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_radius>`

Sets the joint radius of the bone chain. It is used to move and slide with the :ref:`SpringBoneCollision3D<class_SpringBoneCollision3D>` in the collision list.

The value is scaled by :ref:`set_radius_damping_curve()<class_SpringBoneSimulator3D_method_set_radius_damping_curve>` and cached in each joint setting in the joint list.

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.. _class_SpringBoneSimulator3D_method_set_radius_damping_curve:

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|void| **set_radius_damping_curve**\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_radius_damping_curve>`

Sets the joint radius damping curve of the bone chain.

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.. _class_SpringBoneSimulator3D_method_set_root_bone:

.. rst-class:: classref-method

|void| **set_root_bone**\ (\ index\: :ref:`int<class_int>`, bone\: :ref:`int<class_int>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_root_bone>`

Sets the root bone index of the bone chain.

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.. _class_SpringBoneSimulator3D_method_set_root_bone_name:

.. rst-class:: classref-method

|void| **set_root_bone_name**\ (\ index\: :ref:`int<class_int>`, bone_name\: :ref:`String<class_String>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_root_bone_name>`

Sets the root bone name of the bone chain.

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.. _class_SpringBoneSimulator3D_method_set_rotation_axis:

.. rst-class:: classref-method

|void| **set_rotation_axis**\ (\ index\: :ref:`int<class_int>`, axis\: :ref:`RotationAxis<enum_SkeletonModifier3D_RotationAxis>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_rotation_axis>`

Sets the rotation axis of the bone chain. If set to a specific axis, it acts like a hinge joint. The value is cached in each joint setting in the joint list.

The axes are based on the :ref:`Skeleton3D.get_bone_rest()<class_Skeleton3D_method_get_bone_rest>`'s space, if ``axis`` is :ref:`SkeletonModifier3D.ROTATION_AXIS_CUSTOM<class_SkeletonModifier3D_constant_ROTATION_AXIS_CUSTOM>`, you can specify any axis.

\ **Note:** The rotation axis vector and the forward vector shouldn't be colinear to avoid unintended rotation since **SpringBoneSimulator3D** does not factor in twisting forces.

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.. _class_SpringBoneSimulator3D_method_set_rotation_axis_vector:

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|void| **set_rotation_axis_vector**\ (\ index\: :ref:`int<class_int>`, vector\: :ref:`Vector3<class_Vector3>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_rotation_axis_vector>`

Sets the rotation axis vector of the bone chain. The value is cached in each joint setting in the joint list.

This vector is normalized by an internal process and represents the axis around which the bone chain can rotate.

If the vector length is ``0``, it is considered synonymous with :ref:`SkeletonModifier3D.ROTATION_AXIS_ALL<class_SkeletonModifier3D_constant_ROTATION_AXIS_ALL>`.

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.. _class_SpringBoneSimulator3D_method_set_stiffness:

.. rst-class:: classref-method

|void| **set_stiffness**\ (\ index\: :ref:`int<class_int>`, stiffness\: :ref:`float<class_float>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_stiffness>`

Sets the stiffness force of the bone chain. The greater the value, the faster it recovers to its initial pose.

If ``stiffness`` is ``0``, the modified pose will not return to the original pose.

The value is scaled by :ref:`set_stiffness_damping_curve()<class_SpringBoneSimulator3D_method_set_stiffness_damping_curve>` and cached in each joint setting in the joint list.

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.. _class_SpringBoneSimulator3D_method_set_stiffness_damping_curve:

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|void| **set_stiffness_damping_curve**\ (\ index\: :ref:`int<class_int>`, curve\: :ref:`Curve<class_Curve>`\ ) :ref:`🔗<class_SpringBoneSimulator3D_method_set_stiffness_damping_curve>`

Sets the stiffness force damping curve of the bone chain.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |required| replace:: :abbr:`required (This method is required to be overridden when extending its base class.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`
.. |void| replace:: :abbr:`void (No return value.)`