godot-docs/classes/class_gpuparticles3d.rst

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.. _class_GPUParticles3D:

GPUParticles3D
==============

**Inherits:** :ref:`GeometryInstance3D<class_GeometryInstance3D>` **<** :ref:`VisualInstance3D<class_VisualInstance3D>` **<** :ref:`Node3D<class_Node3D>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

3D particle emitter.

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

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

3D particle node used to create a variety of particle systems and effects. **GPUParticles3D** features an emitter that generates some number of particles at a given rate.

Use the ``process_material`` property to add a :ref:`ParticleProcessMaterial<class_ParticleProcessMaterial>` to configure particle appearance and behavior. Alternatively, you can add a :ref:`ShaderMaterial<class_ShaderMaterial>` which will be applied to all particles.

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

Tutorials
---------

- :doc:`Particle systems (3D) <../tutorials/3d/particles/index>`

- :doc:`Controlling thousands of fish with Particles <../tutorials/performance/vertex_animation/controlling_thousands_of_fish>`

- `Third Person Shooter Demo <https://godotengine.org/asset-library/asset/678>`__

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

Properties
----------

.. table::
   :widths: auto

   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`int<class_int>`                                     | :ref:`amount<class_GPUParticles3D_property_amount>`                           | ``8``                         |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`collision_base_size<class_GPUParticles3D_property_collision_base_size>` | ``0.01``                      |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>`           | :ref:`draw_order<class_GPUParticles3D_property_draw_order>`                   | ``0``                         |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`Mesh<class_Mesh>`                                   | :ref:`draw_pass_1<class_GPUParticles3D_property_draw_pass_1>`                 |                               |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`Mesh<class_Mesh>`                                   | :ref:`draw_pass_2<class_GPUParticles3D_property_draw_pass_2>`                 |                               |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`Mesh<class_Mesh>`                                   | :ref:`draw_pass_3<class_GPUParticles3D_property_draw_pass_3>`                 |                               |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`Mesh<class_Mesh>`                                   | :ref:`draw_pass_4<class_GPUParticles3D_property_draw_pass_4>`                 |                               |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`int<class_int>`                                     | :ref:`draw_passes<class_GPUParticles3D_property_draw_passes>`                 | ``1``                         |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`Skin<class_Skin>`                                   | :ref:`draw_skin<class_GPUParticles3D_property_draw_skin>`                     |                               |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`bool<class_bool>`                                   | :ref:`emitting<class_GPUParticles3D_property_emitting>`                       | ``true``                      |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`explosiveness<class_GPUParticles3D_property_explosiveness>`             | ``0.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`int<class_int>`                                     | :ref:`fixed_fps<class_GPUParticles3D_property_fixed_fps>`                     | ``30``                        |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`bool<class_bool>`                                   | :ref:`fract_delta<class_GPUParticles3D_property_fract_delta>`                 | ``true``                      |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`bool<class_bool>`                                   | :ref:`interpolate<class_GPUParticles3D_property_interpolate>`                 | ``true``                      |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`lifetime<class_GPUParticles3D_property_lifetime>`                       | ``1.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`bool<class_bool>`                                   | :ref:`local_coords<class_GPUParticles3D_property_local_coords>`               | ``false``                     |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`bool<class_bool>`                                   | :ref:`one_shot<class_GPUParticles3D_property_one_shot>`                       | ``false``                     |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`preprocess<class_GPUParticles3D_property_preprocess>`                   | ``0.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`Material<class_Material>`                           | :ref:`process_material<class_GPUParticles3D_property_process_material>`       |                               |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`randomness<class_GPUParticles3D_property_randomness>`                   | ``0.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`speed_scale<class_GPUParticles3D_property_speed_scale>`                 | ``1.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`NodePath<class_NodePath>`                           | :ref:`sub_emitter<class_GPUParticles3D_property_sub_emitter>`                 | ``NodePath("")``              |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`bool<class_bool>`                                   | :ref:`trail_enabled<class_GPUParticles3D_property_trail_enabled>`             | ``false``                     |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`float<class_float>`                                 | :ref:`trail_lifetime<class_GPUParticles3D_property_trail_lifetime>`           | ``0.3``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` | :ref:`transform_align<class_GPUParticles3D_property_transform_align>`         | ``0``                         |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :ref:`AABB<class_AABB>`                                   | :ref:`visibility_aabb<class_GPUParticles3D_property_visibility_aabb>`         | ``AABB(-4, -4, -4, 8, 8, 8)`` |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+

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

Methods
-------

.. table::
   :widths: auto

   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`AABB<class_AABB>` | :ref:`capture_aabb<class_GPUParticles3D_method_capture_aabb>` **(** **)** |const|                                                                                                                                                                               |
   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                    | :ref:`emit_particle<class_GPUParticles3D_method_emit_particle>` **(** :ref:`Transform3D<class_Transform3D>` xform, :ref:`Vector3<class_Vector3>` velocity, :ref:`Color<class_Color>` color, :ref:`Color<class_Color>` custom, :ref:`int<class_int>` flags **)** |
   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Mesh<class_Mesh>` | :ref:`get_draw_pass_mesh<class_GPUParticles3D_method_get_draw_pass_mesh>` **(** :ref:`int<class_int>` pass **)** |const|                                                                                                                                        |
   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                    | :ref:`restart<class_GPUParticles3D_method_restart>` **(** **)**                                                                                                                                                                                                 |
   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                    | :ref:`set_draw_pass_mesh<class_GPUParticles3D_method_set_draw_pass_mesh>` **(** :ref:`int<class_int>` pass, :ref:`Mesh<class_Mesh>` mesh **)**                                                                                                                  |
   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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

----

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

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

.. _enum_GPUParticles3D_DrawOrder:

.. rst-class:: classref-enumeration

enum **DrawOrder**:

.. _class_GPUParticles3D_constant_DRAW_ORDER_INDEX:

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

:ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` **DRAW_ORDER_INDEX** = ``0``

Particles are drawn in the order emitted.

.. _class_GPUParticles3D_constant_DRAW_ORDER_LIFETIME:

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

:ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` **DRAW_ORDER_LIFETIME** = ``1``

Particles are drawn in order of remaining lifetime. In other words, the particle with the highest lifetime is drawn at the front.

.. _class_GPUParticles3D_constant_DRAW_ORDER_REVERSE_LIFETIME:

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

:ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` **DRAW_ORDER_REVERSE_LIFETIME** = ``2``

Particles are drawn in reverse order of remaining lifetime. In other words, the particle with the lowest lifetime is drawn at the front.

.. _class_GPUParticles3D_constant_DRAW_ORDER_VIEW_DEPTH:

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

:ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` **DRAW_ORDER_VIEW_DEPTH** = ``3``

Particles are drawn in order of depth.

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

----

.. _enum_GPUParticles3D_EmitFlags:

.. rst-class:: classref-enumeration

enum **EmitFlags**:

.. _class_GPUParticles3D_constant_EMIT_FLAG_POSITION:

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

:ref:`EmitFlags<enum_GPUParticles3D_EmitFlags>` **EMIT_FLAG_POSITION** = ``1``

Particle starts at the specified position.

.. _class_GPUParticles3D_constant_EMIT_FLAG_ROTATION_SCALE:

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

:ref:`EmitFlags<enum_GPUParticles3D_EmitFlags>` **EMIT_FLAG_ROTATION_SCALE** = ``2``

Particle starts with specified rotation and scale.

.. _class_GPUParticles3D_constant_EMIT_FLAG_VELOCITY:

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

:ref:`EmitFlags<enum_GPUParticles3D_EmitFlags>` **EMIT_FLAG_VELOCITY** = ``4``

Particle starts with the specified velocity vector, which defines the emission direction and speed.

.. _class_GPUParticles3D_constant_EMIT_FLAG_COLOR:

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

:ref:`EmitFlags<enum_GPUParticles3D_EmitFlags>` **EMIT_FLAG_COLOR** = ``8``

Particle starts with specified color.

.. _class_GPUParticles3D_constant_EMIT_FLAG_CUSTOM:

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

:ref:`EmitFlags<enum_GPUParticles3D_EmitFlags>` **EMIT_FLAG_CUSTOM** = ``16``

Particle starts with specified ``CUSTOM`` data.

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

----

.. _enum_GPUParticles3D_TransformAlign:

.. rst-class:: classref-enumeration

enum **TransformAlign**:

.. _class_GPUParticles3D_constant_TRANSFORM_ALIGN_DISABLED:

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

:ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` **TRANSFORM_ALIGN_DISABLED** = ``0``



.. _class_GPUParticles3D_constant_TRANSFORM_ALIGN_Z_BILLBOARD:

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

:ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` **TRANSFORM_ALIGN_Z_BILLBOARD** = ``1``



.. _class_GPUParticles3D_constant_TRANSFORM_ALIGN_Y_TO_VELOCITY:

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

:ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` **TRANSFORM_ALIGN_Y_TO_VELOCITY** = ``2``



.. _class_GPUParticles3D_constant_TRANSFORM_ALIGN_Z_BILLBOARD_Y_TO_VELOCITY:

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

:ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` **TRANSFORM_ALIGN_Z_BILLBOARD_Y_TO_VELOCITY** = ``3``



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

----

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

Constants
---------

.. _class_GPUParticles3D_constant_MAX_DRAW_PASSES:

.. rst-class:: classref-constant

**MAX_DRAW_PASSES** = ``4``

Maximum number of draw passes supported.

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

----

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

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

.. _class_GPUParticles3D_property_amount:

.. rst-class:: classref-property

:ref:`int<class_int>` **amount** = ``8``

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

- void **set_amount** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_amount** **(** **)**

Number of particles to emit.

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

----

.. _class_GPUParticles3D_property_collision_base_size:

.. rst-class:: classref-property

:ref:`float<class_float>` **collision_base_size** = ``0.01``

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

- void **set_collision_base_size** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_collision_base_size** **(** **)**

.. container:: contribute

	There is currently no description for this property. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

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

----

.. _class_GPUParticles3D_property_draw_order:

.. rst-class:: classref-property

:ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` **draw_order** = ``0``

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

- void **set_draw_order** **(** :ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` value **)**
- :ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` **get_draw_order** **(** **)**

Particle draw order. Uses :ref:`DrawOrder<enum_GPUParticles3D_DrawOrder>` values.

\ **Note:** :ref:`DRAW_ORDER_INDEX<class_GPUParticles3D_constant_DRAW_ORDER_INDEX>` is the only option that supports motion vectors for effects like TAA. It is suggested to use this draw order if the particles are opaque to fix ghosting artifacts.

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

----

.. _class_GPUParticles3D_property_draw_pass_1:

.. rst-class:: classref-property

:ref:`Mesh<class_Mesh>` **draw_pass_1**

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

- void **set_draw_pass_mesh** **(** :ref:`int<class_int>` pass, :ref:`Mesh<class_Mesh>` mesh **)**
- :ref:`Mesh<class_Mesh>` **get_draw_pass_mesh** **(** :ref:`int<class_int>` pass **)** |const|

:ref:`Mesh<class_Mesh>` that is drawn for the first draw pass.

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

----

.. _class_GPUParticles3D_property_draw_pass_2:

.. rst-class:: classref-property

:ref:`Mesh<class_Mesh>` **draw_pass_2**

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

- void **set_draw_pass_mesh** **(** :ref:`int<class_int>` pass, :ref:`Mesh<class_Mesh>` mesh **)**
- :ref:`Mesh<class_Mesh>` **get_draw_pass_mesh** **(** :ref:`int<class_int>` pass **)** |const|

:ref:`Mesh<class_Mesh>` that is drawn for the second draw pass.

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

----

.. _class_GPUParticles3D_property_draw_pass_3:

.. rst-class:: classref-property

:ref:`Mesh<class_Mesh>` **draw_pass_3**

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

- void **set_draw_pass_mesh** **(** :ref:`int<class_int>` pass, :ref:`Mesh<class_Mesh>` mesh **)**
- :ref:`Mesh<class_Mesh>` **get_draw_pass_mesh** **(** :ref:`int<class_int>` pass **)** |const|

:ref:`Mesh<class_Mesh>` that is drawn for the third draw pass.

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

----

.. _class_GPUParticles3D_property_draw_pass_4:

.. rst-class:: classref-property

:ref:`Mesh<class_Mesh>` **draw_pass_4**

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

- void **set_draw_pass_mesh** **(** :ref:`int<class_int>` pass, :ref:`Mesh<class_Mesh>` mesh **)**
- :ref:`Mesh<class_Mesh>` **get_draw_pass_mesh** **(** :ref:`int<class_int>` pass **)** |const|

:ref:`Mesh<class_Mesh>` that is drawn for the fourth draw pass.

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

----

.. _class_GPUParticles3D_property_draw_passes:

.. rst-class:: classref-property

:ref:`int<class_int>` **draw_passes** = ``1``

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

- void **set_draw_passes** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_draw_passes** **(** **)**

The number of draw passes when rendering particles.

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

----

.. _class_GPUParticles3D_property_draw_skin:

.. rst-class:: classref-property

:ref:`Skin<class_Skin>` **draw_skin**

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

- void **set_skin** **(** :ref:`Skin<class_Skin>` value **)**
- :ref:`Skin<class_Skin>` **get_skin** **(** **)**

.. container:: contribute

	There is currently no description for this property. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

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

----

.. _class_GPUParticles3D_property_emitting:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **emitting** = ``true``

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

- void **set_emitting** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_emitting** **(** **)**

If ``true``, particles are being emitted.

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

----

.. _class_GPUParticles3D_property_explosiveness:

.. rst-class:: classref-property

:ref:`float<class_float>` **explosiveness** = ``0.0``

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

- void **set_explosiveness_ratio** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_explosiveness_ratio** **(** **)**

Time ratio between each emission. If ``0``, particles are emitted continuously. If ``1``, all particles are emitted simultaneously.

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

----

.. _class_GPUParticles3D_property_fixed_fps:

.. rst-class:: classref-property

:ref:`int<class_int>` **fixed_fps** = ``30``

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

- void **set_fixed_fps** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_fixed_fps** **(** **)**

The particle system's frame rate is fixed to a value. For example, changing the value to 2 will make the particles render at 2 frames per second. Note this does not slow down the simulation of the particle system itself.

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

----

.. _class_GPUParticles3D_property_fract_delta:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **fract_delta** = ``true``

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

- void **set_fractional_delta** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **get_fractional_delta** **(** **)**

If ``true``, results in fractional delta calculation which has a smoother particles display effect.

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

----

.. _class_GPUParticles3D_property_interpolate:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **interpolate** = ``true``

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

- void **set_interpolate** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **get_interpolate** **(** **)**

Enables particle interpolation, which makes the particle movement smoother when their :ref:`fixed_fps<class_GPUParticles3D_property_fixed_fps>` is lower than the screen refresh rate.

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

----

.. _class_GPUParticles3D_property_lifetime:

.. rst-class:: classref-property

:ref:`float<class_float>` **lifetime** = ``1.0``

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

- void **set_lifetime** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_lifetime** **(** **)**

Amount of time each particle will exist.

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

----

.. _class_GPUParticles3D_property_local_coords:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **local_coords** = ``false``

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

- void **set_use_local_coordinates** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **get_use_local_coordinates** **(** **)**

If ``true``, particles use the parent node's coordinate space (known as local coordinates). This will cause particles to move and rotate along the **GPUParticles3D** node (and its parents) when it is moved or rotated. If ``false``, particles use global coordinates; they will not move or rotate along the **GPUParticles3D** node (and its parents) when it is moved or rotated.

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

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.. _class_GPUParticles3D_property_one_shot:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **one_shot** = ``false``

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

- void **set_one_shot** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **get_one_shot** **(** **)**

If ``true``, only ``amount`` particles will be emitted.

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

----

.. _class_GPUParticles3D_property_preprocess:

.. rst-class:: classref-property

:ref:`float<class_float>` **preprocess** = ``0.0``

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

- void **set_pre_process_time** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_pre_process_time** **(** **)**

Amount of time to preprocess the particles before animation starts. Lets you start the animation some time after particles have started emitting.

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

----

.. _class_GPUParticles3D_property_process_material:

.. rst-class:: classref-property

:ref:`Material<class_Material>` **process_material**

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

- void **set_process_material** **(** :ref:`Material<class_Material>` value **)**
- :ref:`Material<class_Material>` **get_process_material** **(** **)**

:ref:`Material<class_Material>` for processing particles. Can be a :ref:`ParticleProcessMaterial<class_ParticleProcessMaterial>` or a :ref:`ShaderMaterial<class_ShaderMaterial>`.

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

----

.. _class_GPUParticles3D_property_randomness:

.. rst-class:: classref-property

:ref:`float<class_float>` **randomness** = ``0.0``

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

- void **set_randomness_ratio** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_randomness_ratio** **(** **)**

Emission randomness ratio.

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

----

.. _class_GPUParticles3D_property_speed_scale:

.. rst-class:: classref-property

:ref:`float<class_float>` **speed_scale** = ``1.0``

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

- void **set_speed_scale** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_speed_scale** **(** **)**

Speed scaling ratio. A value of ``0`` can be used to pause the particles.

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

----

.. _class_GPUParticles3D_property_sub_emitter:

.. rst-class:: classref-property

:ref:`NodePath<class_NodePath>` **sub_emitter** = ``NodePath("")``

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

- void **set_sub_emitter** **(** :ref:`NodePath<class_NodePath>` value **)**
- :ref:`NodePath<class_NodePath>` **get_sub_emitter** **(** **)**

.. container:: contribute

	There is currently no description for this property. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

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

----

.. _class_GPUParticles3D_property_trail_enabled:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **trail_enabled** = ``false``

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

- void **set_trail_enabled** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_trail_enabled** **(** **)**

If ``true``, enables particle trails using a mesh skinning system. Designed to work with :ref:`RibbonTrailMesh<class_RibbonTrailMesh>` and :ref:`TubeTrailMesh<class_TubeTrailMesh>`.

\ **Note:** :ref:`BaseMaterial3D.use_particle_trails<class_BaseMaterial3D_property_use_particle_trails>` must also be enabled on the particle mesh's material. Otherwise, setting :ref:`trail_enabled<class_GPUParticles3D_property_trail_enabled>` to ``true`` will have no effect.

\ **Note:** Unlike :ref:`GPUParticles2D<class_GPUParticles2D>`, the number of trail sections and subdivisions is set in the :ref:`RibbonTrailMesh<class_RibbonTrailMesh>` or the :ref:`TubeTrailMesh<class_TubeTrailMesh>`'s properties.

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

----

.. _class_GPUParticles3D_property_trail_lifetime:

.. rst-class:: classref-property

:ref:`float<class_float>` **trail_lifetime** = ``0.3``

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

- void **set_trail_lifetime** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_trail_lifetime** **(** **)**

The amount of time the particle's trail should represent (in seconds). Only effective if :ref:`trail_enabled<class_GPUParticles3D_property_trail_enabled>` is ``true``.

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

----

.. _class_GPUParticles3D_property_transform_align:

.. rst-class:: classref-property

:ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` **transform_align** = ``0``

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

- void **set_transform_align** **(** :ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` value **)**
- :ref:`TransformAlign<enum_GPUParticles3D_TransformAlign>` **get_transform_align** **(** **)**

.. container:: contribute

	There is currently no description for this property. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

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

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.. _class_GPUParticles3D_property_visibility_aabb:

.. rst-class:: classref-property

:ref:`AABB<class_AABB>` **visibility_aabb** = ``AABB(-4, -4, -4, 8, 8, 8)``

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

- void **set_visibility_aabb** **(** :ref:`AABB<class_AABB>` value **)**
- :ref:`AABB<class_AABB>` **get_visibility_aabb** **(** **)**

The :ref:`AABB<class_AABB>` that determines the node's region which needs to be visible on screen for the particle system to be active.

Grow the box if particles suddenly appear/disappear when the node enters/exits the screen. The :ref:`AABB<class_AABB>` can be grown via code or with the **Particles → Generate AABB** editor tool.

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

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

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

.. _class_GPUParticles3D_method_capture_aabb:

.. rst-class:: classref-method

:ref:`AABB<class_AABB>` **capture_aabb** **(** **)** |const|

Returns the axis-aligned bounding box that contains all the particles that are active in the current frame.

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

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.. _class_GPUParticles3D_method_emit_particle:

.. rst-class:: classref-method

void **emit_particle** **(** :ref:`Transform3D<class_Transform3D>` xform, :ref:`Vector3<class_Vector3>` velocity, :ref:`Color<class_Color>` color, :ref:`Color<class_Color>` custom, :ref:`int<class_int>` flags **)**

Emits a single particle. Whether ``xform``, ``velocity``, ``color`` and ``custom`` are applied depends on the value of ``flags``. See :ref:`EmitFlags<enum_GPUParticles3D_EmitFlags>`.

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

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.. _class_GPUParticles3D_method_get_draw_pass_mesh:

.. rst-class:: classref-method

:ref:`Mesh<class_Mesh>` **get_draw_pass_mesh** **(** :ref:`int<class_int>` pass **)** |const|

Returns the :ref:`Mesh<class_Mesh>` that is drawn at index ``pass``.

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

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.. _class_GPUParticles3D_method_restart:

.. rst-class:: classref-method

void **restart** **(** **)**

Restarts the particle emission, clearing existing particles.

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

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.. _class_GPUParticles3D_method_set_draw_pass_mesh:

.. rst-class:: classref-method

void **set_draw_pass_mesh** **(** :ref:`int<class_int>` pass, :ref:`Mesh<class_Mesh>` mesh **)**

Sets the :ref:`Mesh<class_Mesh>` that is drawn at index ``pass``.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |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.)`