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>`

A 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 :ref:`process_material<class_GPUParticles3D_property_process_material>` 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:`amount_ratio<class_GPUParticles3D_property_amount_ratio>`               | ``1.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :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:`float<class_float>`                                 | :ref:`interp_to_end<class_GPUParticles3D_property_interp_to_end>`             | ``0.0``                       |
   +-----------------------------------------------------------+-------------------------------------------------------------------------------+-------------------------------+
   | :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:`convert_from_particles<class_GPUParticles3D_method_convert_from_particles>` **(** :ref:`Node<class_Node>` particles **)**                                                                                                                                 |
   +-------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | 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

Signals
-------

.. _class_GPUParticles3D_signal_finished:

.. rst-class:: classref-signal

**finished** **(** **)**

Emitted when all active particles have finished processing. When :ref:`one_shot<class_GPUParticles3D_property_one_shot>` is disabled, particles will process continuously, so this is never emitted.

\ **Note:** Due to the particles being computed on the GPU there might be a delay before the signal gets emitted.

.. 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.

.. _class_GPUParticles3D_constant_DRAW_ORDER_REVERSE_LIFETIME:

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

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



.. _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** **(** **)**

The number of particles to emit in one emission cycle. The effective emission rate is ``(amount * amount_ratio) / lifetime`` particles per second. Higher values will increase GPU requirements, even if not all particles are visible at a given time or if :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>` is decreased.

\ **Note:** Changing this value will cause the particle system to restart. To avoid this, change :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>` instead.

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

----

.. _class_GPUParticles3D_property_amount_ratio:

.. rst-class:: classref-property

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

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

- void **set_amount_ratio** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_amount_ratio** **(** **)**

The ratio of particles that should actually be emitted. If set to a value lower than ``1.0``, this will set the amount of emitted particles throughout the lifetime to ``amount * amount_ratio``. Unlike changing :ref:`amount<class_GPUParticles3D_property_amount>`, changing :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>` while emitting does not affect already-emitted particles and doesn't cause the particle system to restart. :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>` can be used to create effects that make the number of emitted particles vary over time.

\ **Note:** Reducing the :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>` has no performance benefit, since resources need to be allocated and processed for the total :ref:`amount<class_GPUParticles3D_property_amount>` of particles regardless of the :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>`. If you don't intend to change the number of particles emitted while the particles are emitting, make sure :ref:`amount_ratio<class_GPUParticles3D_property_amount_ratio>` is set to ``1`` and change :ref:`amount<class_GPUParticles3D_property_amount>` to your liking instead.

.. 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** **(** **)**

The base diameter for particle collision in meters. If particles appear to sink into the ground when colliding, increase this value. If particles appear to float when colliding, decrease this value. Only effective if :ref:`ParticleProcessMaterial.collision_mode<class_ParticleProcessMaterial_property_collision_mode>` is :ref:`ParticleProcessMaterial.COLLISION_RIGID<class_ParticleProcessMaterial_constant_COLLISION_RIGID>` or :ref:`ParticleProcessMaterial.COLLISION_HIDE_ON_CONTACT<class_ParticleProcessMaterial_constant_COLLISION_HIDE_ON_CONTACT>`.

\ **Note:** Particles always have a spherical collision shape.

.. 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

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.. _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. :ref:`emitting<class_GPUParticles3D_property_emitting>` can be used to start and stop particles from emitting. However, if :ref:`one_shot<class_GPUParticles3D_property_one_shot>` is ``true`` setting :ref:`emitting<class_GPUParticles3D_property_emitting>` to ``true`` will not restart the emission cycle until after all active particles finish processing. You can use the :ref:`finished<class_GPUParticles3D_signal_finished>` signal to be notified once all active particles finish processing.

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

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.. _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

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.. _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

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.. _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

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.. _class_GPUParticles3D_property_interp_to_end:

.. rst-class:: classref-property

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

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

- void **set_interp_to_end** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_interp_to_end** **(** **)**

Causes all the particles in this node to interpolate towards the end of their lifetime.

\ **Note:** This only works when used with a :ref:`ParticleProcessMaterial<class_ParticleProcessMaterial>`. It needs to be manually implemented for custom process shaders.

.. 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** **(** **)**

The amount of time each particle will exist (in seconds). The effective emission rate is ``(amount * amount_ratio) / lifetime`` particles per second.

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

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.. _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 the number of particles equal to :ref:`amount<class_GPUParticles3D_property_amount>` 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

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.. _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

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.. _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

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.. _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

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.. _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** **(** **)**

Path to another **GPUParticles3D** node that will be used as a subemitter (see :ref:`ParticleProcessMaterial.sub_emitter_mode<class_ParticleProcessMaterial_property_sub_emitter_mode>`). Subemitters can be used to achieve effects such as fireworks, sparks on collision, bubbles popping into water drops, and more.

\ **Note:** When :ref:`sub_emitter<class_GPUParticles3D_property_sub_emitter>` is set, the target **GPUParticles3D** node will no longer emit particles on its own.

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

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.. _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

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.. _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

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.. _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. :ref:`GeometryInstance3D.extra_cull_margin<class_GeometryInstance3D_property_extra_cull_margin>` is added on each of the AABB's axes. Particle collisions and attraction will only occur within this area.

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.

\ **Note:** :ref:`visibility_aabb<class_GPUParticles3D_property_visibility_aabb>` is overridden by :ref:`GeometryInstance3D.custom_aabb<class_GeometryInstance3D_property_custom_aabb>` if that property is set to a non-default value.

.. 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_convert_from_particles:

.. rst-class:: classref-method

void **convert_from_particles** **(** :ref:`Node<class_Node>` particles **)**

Sets this node's properties to match a given :ref:`CPUParticles3D<class_CPUParticles3D>` node.

.. 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.)`