godot-docs/classes/class_particles.rst

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.. DO NOT EDIT THIS FILE, but the Particles.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_Particles:

Particles
=========

**Inherits:** :ref:`GeometryInstance<class_GeometryInstance>` **<** :ref:`VisualInstance<class_VisualInstance>` **<** :ref:`Spatial<class_Spatial>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

**Category:** Core

Brief Description
-----------------

3D particle emitter.

Properties
----------

+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`int<class_int>`                      | :ref:`amount<class_Particles_property_amount>`                     |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`DrawOrder<enum_Particles_DrawOrder>` | :ref:`draw_order<class_Particles_property_draw_order>`             |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`Mesh<class_Mesh>`                    | :ref:`draw_pass_1<class_Particles_property_draw_pass_1>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`Mesh<class_Mesh>`                    | :ref:`draw_pass_2<class_Particles_property_draw_pass_2>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`Mesh<class_Mesh>`                    | :ref:`draw_pass_3<class_Particles_property_draw_pass_3>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`Mesh<class_Mesh>`                    | :ref:`draw_pass_4<class_Particles_property_draw_pass_4>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`int<class_int>`                      | :ref:`draw_passes<class_Particles_property_draw_passes>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`bool<class_bool>`                    | :ref:`emitting<class_Particles_property_emitting>`                 |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`float<class_float>`                  | :ref:`explosiveness<class_Particles_property_explosiveness>`       |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`int<class_int>`                      | :ref:`fixed_fps<class_Particles_property_fixed_fps>`               |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`bool<class_bool>`                    | :ref:`fract_delta<class_Particles_property_fract_delta>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`float<class_float>`                  | :ref:`lifetime<class_Particles_property_lifetime>`                 |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`bool<class_bool>`                    | :ref:`local_coords<class_Particles_property_local_coords>`         |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`bool<class_bool>`                    | :ref:`one_shot<class_Particles_property_one_shot>`                 |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`float<class_float>`                  | :ref:`preprocess<class_Particles_property_preprocess>`             |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`Material<class_Material>`            | :ref:`process_material<class_Particles_property_process_material>` |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`float<class_float>`                  | :ref:`randomness<class_Particles_property_randomness>`             |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`float<class_float>`                  | :ref:`speed_scale<class_Particles_property_speed_scale>`           |
+--------------------------------------------+--------------------------------------------------------------------+
| :ref:`AABB<class_AABB>`                    | :ref:`visibility_aabb<class_Particles_property_visibility_aabb>`   |
+--------------------------------------------+--------------------------------------------------------------------+

Methods
-------

+-------------------------+----------------------------------------------------------------------------+
| :ref:`AABB<class_AABB>` | :ref:`capture_aabb<class_Particles_method_capture_aabb>` **(** **)** const |
+-------------------------+----------------------------------------------------------------------------+
| void                    | :ref:`restart<class_Particles_method_restart>` **(** **)**                 |
+-------------------------+----------------------------------------------------------------------------+

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

.. _enum_Particles_DrawOrder:

.. _class_Particles_constant_DRAW_ORDER_INDEX:

.. _class_Particles_constant_DRAW_ORDER_LIFETIME:

.. _class_Particles_constant_DRAW_ORDER_VIEW_DEPTH:

enum **DrawOrder**:

- **DRAW_ORDER_INDEX** = **0** --- Particles are drawn in the order emitted.

- **DRAW_ORDER_LIFETIME** = **1** --- Particles are drawn in order of remaining lifetime.

- **DRAW_ORDER_VIEW_DEPTH** = **2** --- Particles are drawn in order of depth.

Constants
---------

.. _class_Particles_constant_MAX_DRAW_PASSES:

- **MAX_DRAW_PASSES** = **4** --- Maximum number of draw passes supported.

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

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

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

Tutorials
---------

- :doc:`../tutorials/3d/vertex_animation/controlling_thousands_of_fish`

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

.. _class_Particles_property_amount:

- :ref:`int<class_int>` **amount**

+----------+-------------------+
| *Setter* | set_amount(value) |
+----------+-------------------+
| *Getter* | get_amount()      |
+----------+-------------------+

Number of particles to emit.

----

.. _class_Particles_property_draw_order:

- :ref:`DrawOrder<enum_Particles_DrawOrder>` **draw_order**

+----------+-----------------------+
| *Setter* | set_draw_order(value) |
+----------+-----------------------+
| *Getter* | get_draw_order()      |
+----------+-----------------------+

Particle draw order. Uses ``DRAW_ORDER_*`` values. Default value: :ref:`DRAW_ORDER_INDEX<class_Particles_constant_DRAW_ORDER_INDEX>`.

----

.. _class_Particles_property_draw_pass_1:

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

+----------+---------------------------+
| *Setter* | set_draw_pass_mesh(value) |
+----------+---------------------------+
| *Getter* | get_draw_pass_mesh()      |
+----------+---------------------------+

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

----

.. _class_Particles_property_draw_pass_2:

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

+----------+---------------------------+
| *Setter* | set_draw_pass_mesh(value) |
+----------+---------------------------+
| *Getter* | get_draw_pass_mesh()      |
+----------+---------------------------+

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

----

.. _class_Particles_property_draw_pass_3:

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

+----------+---------------------------+
| *Setter* | set_draw_pass_mesh(value) |
+----------+---------------------------+
| *Getter* | get_draw_pass_mesh()      |
+----------+---------------------------+

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

----

.. _class_Particles_property_draw_pass_4:

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

+----------+---------------------------+
| *Setter* | set_draw_pass_mesh(value) |
+----------+---------------------------+
| *Getter* | get_draw_pass_mesh()      |
+----------+---------------------------+

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

----

.. _class_Particles_property_draw_passes:

- :ref:`int<class_int>` **draw_passes**

+----------+------------------------+
| *Setter* | set_draw_passes(value) |
+----------+------------------------+
| *Getter* | get_draw_passes()      |
+----------+------------------------+

The number of draw passes when rendering particles.

----

.. _class_Particles_property_emitting:

- :ref:`bool<class_bool>` **emitting**

+----------+---------------------+
| *Setter* | set_emitting(value) |
+----------+---------------------+
| *Getter* | is_emitting()       |
+----------+---------------------+

If ``true``, particles are being emitted. Default value: ``true``.

----

.. _class_Particles_property_explosiveness:

- :ref:`float<class_float>` **explosiveness**

+----------+--------------------------------+
| *Setter* | set_explosiveness_ratio(value) |
+----------+--------------------------------+
| *Getter* | get_explosiveness_ratio()      |
+----------+--------------------------------+

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

----

.. _class_Particles_property_fixed_fps:

- :ref:`int<class_int>` **fixed_fps**

+----------+----------------------+
| *Setter* | set_fixed_fps(value) |
+----------+----------------------+
| *Getter* | get_fixed_fps()      |
+----------+----------------------+

The particle system's frame rate is fixed to a value. For instance, 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.

----

.. _class_Particles_property_fract_delta:

- :ref:`bool<class_bool>` **fract_delta**

+----------+-----------------------------+
| *Setter* | set_fractional_delta(value) |
+----------+-----------------------------+
| *Getter* | get_fractional_delta()      |
+----------+-----------------------------+

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

----

.. _class_Particles_property_lifetime:

- :ref:`float<class_float>` **lifetime**

+----------+---------------------+
| *Setter* | set_lifetime(value) |
+----------+---------------------+
| *Getter* | get_lifetime()      |
+----------+---------------------+

Amount of time each particle will exist. Default value: ``1``.

----

.. _class_Particles_property_local_coords:

- :ref:`bool<class_bool>` **local_coords**

+----------+----------------------------------+
| *Setter* | set_use_local_coordinates(value) |
+----------+----------------------------------+
| *Getter* | get_use_local_coordinates()      |
+----------+----------------------------------+

If ``true``, particles use the parent node's coordinate space. If ``false``, they use global coordinates. Default value: ``true``.

----

.. _class_Particles_property_one_shot:

- :ref:`bool<class_bool>` **one_shot**

+----------+---------------------+
| *Setter* | set_one_shot(value) |
+----------+---------------------+
| *Getter* | get_one_shot()      |
+----------+---------------------+

If ``true``, only ``amount`` particles will be emitted. Default value: ``false``.

----

.. _class_Particles_property_preprocess:

- :ref:`float<class_float>` **preprocess**

+----------+-----------------------------+
| *Setter* | set_pre_process_time(value) |
+----------+-----------------------------+
| *Getter* | 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.

----

.. _class_Particles_property_process_material:

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

+----------+-----------------------------+
| *Setter* | set_process_material(value) |
+----------+-----------------------------+
| *Getter* | get_process_material()      |
+----------+-----------------------------+

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

----

.. _class_Particles_property_randomness:

- :ref:`float<class_float>` **randomness**

+----------+-----------------------------+
| *Setter* | set_randomness_ratio(value) |
+----------+-----------------------------+
| *Getter* | get_randomness_ratio()      |
+----------+-----------------------------+

Emission randomness ratio. Default value: ``0``.

----

.. _class_Particles_property_speed_scale:

- :ref:`float<class_float>` **speed_scale**

+----------+------------------------+
| *Setter* | set_speed_scale(value) |
+----------+------------------------+
| *Getter* | get_speed_scale()      |
+----------+------------------------+

Speed scaling ratio. Default value: ``1``. A value of ``0`` can be used to pause the particles.

----

.. _class_Particles_property_visibility_aabb:

- :ref:`AABB<class_AABB>` **visibility_aabb**

+----------+----------------------------+
| *Setter* | set_visibility_aabb(value) |
+----------+----------------------------+
| *Getter* | get_visibility_aabb()      |
+----------+----------------------------+

The :ref:`AABB<class_AABB>` that determines the area of the world part of which needs to be visible on screen for the particle system to be active.

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

.. _class_Particles_method_capture_aabb:

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

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

----

.. _class_Particles_method_restart:

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

Restarts the particle emission, clearing existing particles.