godot-docs/classes/class_particles2d.rst

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.. DO NOT EDIT THIS FILE, but the Particles2D.xml source instead.
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.. _class_Particles2D:

Particles2D
===========

**Inherits:** :ref:`Node2D<class_Node2D>` **<** :ref:`CanvasItem<class_CanvasItem>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

GPU-based 2D particle emitter.

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

2D particle node used to create a variety of particle systems and effects. ``Particles2D`` 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.

**Note:** ``Particles2D`` only work when using the GLES3 renderer. If using the GLES2 renderer, use :ref:`CPUParticles2D<class_CPUParticles2D>` instead. You can convert ``Particles2D`` to :ref:`CPUParticles2D<class_CPUParticles2D>` by selecting the node, clicking the **Particles** menu at the top of the 2D editor viewport then choosing **Convert to CPUParticles2D**.

**Note:** On macOS, ``Particles2D`` rendering is much slower than :ref:`CPUParticles2D<class_CPUParticles2D>` due to transform feedback being implemented on the CPU instead of the GPU. Consider using :ref:`CPUParticles2D<class_CPUParticles2D>` instead when targeting macOS.

**Note:** After working on a Particles node, remember to update its :ref:`visibility_rect<class_Particles2D_property_visibility_rect>` by selecting it, clicking the **Particles** menu at the top of the 2D editor viewport then choose **Generate Visibility Rect**. Otherwise, particles may suddenly disappear depending on the camera position and angle.

**Note:** Unlike :ref:`CPUParticles2D<class_CPUParticles2D>`, ``Particles2D`` currently ignore the texture region defined in :ref:`AtlasTexture<class_AtlasTexture>`\ s.

Tutorials
---------

- :doc:`../tutorials/2d/particle_systems_2d`

- `2D Dodge The Creeps Demo <https://godotengine.org/asset-library/asset/515>`__

Properties
----------

+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`int<class_int>`                        | :ref:`amount<class_Particles2D_property_amount>`                     | ``8``                             |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`DrawOrder<enum_Particles2D_DrawOrder>` | :ref:`draw_order<class_Particles2D_property_draw_order>`             | ``0``                             |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`bool<class_bool>`                      | :ref:`emitting<class_Particles2D_property_emitting>`                 | ``true``                          |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`float<class_float>`                    | :ref:`explosiveness<class_Particles2D_property_explosiveness>`       | ``0.0``                           |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`int<class_int>`                        | :ref:`fixed_fps<class_Particles2D_property_fixed_fps>`               | ``0``                             |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`bool<class_bool>`                      | :ref:`fract_delta<class_Particles2D_property_fract_delta>`           | ``true``                          |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`float<class_float>`                    | :ref:`lifetime<class_Particles2D_property_lifetime>`                 | ``1.0``                           |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`bool<class_bool>`                      | :ref:`local_coords<class_Particles2D_property_local_coords>`         | ``true``                          |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`Texture<class_Texture>`                | :ref:`normal_map<class_Particles2D_property_normal_map>`             |                                   |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`bool<class_bool>`                      | :ref:`one_shot<class_Particles2D_property_one_shot>`                 | ``false``                         |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`float<class_float>`                    | :ref:`preprocess<class_Particles2D_property_preprocess>`             | ``0.0``                           |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`Material<class_Material>`              | :ref:`process_material<class_Particles2D_property_process_material>` |                                   |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`float<class_float>`                    | :ref:`randomness<class_Particles2D_property_randomness>`             | ``0.0``                           |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`float<class_float>`                    | :ref:`speed_scale<class_Particles2D_property_speed_scale>`           | ``1.0``                           |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`Texture<class_Texture>`                | :ref:`texture<class_Particles2D_property_texture>`                   |                                   |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+
| :ref:`Rect2<class_Rect2>`                    | :ref:`visibility_rect<class_Particles2D_property_visibility_rect>`   | ``Rect2( -100, -100, 200, 200 )`` |
+----------------------------------------------+----------------------------------------------------------------------+-----------------------------------+

Methods
-------

+---------------------------+--------------------------------------------------------------------------------+
| :ref:`Rect2<class_Rect2>` | :ref:`capture_rect<class_Particles2D_method_capture_rect>` **(** **)** |const| |
+---------------------------+--------------------------------------------------------------------------------+
| void                      | :ref:`restart<class_Particles2D_method_restart>` **(** **)**                   |
+---------------------------+--------------------------------------------------------------------------------+

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

.. _enum_Particles2D_DrawOrder:

.. _class_Particles2D_constant_DRAW_ORDER_INDEX:

.. _class_Particles2D_constant_DRAW_ORDER_LIFETIME:

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.

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

.. _class_Particles2D_property_amount:

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

+-----------+-------------------+
| *Default* | ``8``             |
+-----------+-------------------+
| *Setter*  | set_amount(value) |
+-----------+-------------------+
| *Getter*  | get_amount()      |
+-----------+-------------------+

The number of particles emitted in one emission cycle (corresponding to the :ref:`lifetime<class_Particles2D_property_lifetime>`).

**Note:** Changing :ref:`amount<class_Particles2D_property_amount>` will reset the particle emission, therefore removing all particles that were already emitted before changing :ref:`amount<class_Particles2D_property_amount>`.

----

.. _class_Particles2D_property_draw_order:

- :ref:`DrawOrder<enum_Particles2D_DrawOrder>` **draw_order**

+-----------+-----------------------+
| *Default* | ``0``                 |
+-----------+-----------------------+
| *Setter*  | set_draw_order(value) |
+-----------+-----------------------+
| *Getter*  | get_draw_order()      |
+-----------+-----------------------+

Particle draw order. Uses :ref:`DrawOrder<enum_Particles2D_DrawOrder>` values.

----

.. _class_Particles2D_property_emitting:

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

+-----------+---------------------+
| *Default* | ``true``            |
+-----------+---------------------+
| *Setter*  | set_emitting(value) |
+-----------+---------------------+
| *Getter*  | is_emitting()       |
+-----------+---------------------+

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

----

.. _class_Particles2D_property_explosiveness:

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

+-----------+--------------------------------+
| *Default* | ``0.0``                        |
+-----------+--------------------------------+
| *Setter*  | set_explosiveness_ratio(value) |
+-----------+--------------------------------+
| *Getter*  | get_explosiveness_ratio()      |
+-----------+--------------------------------+

How rapidly particles in an emission cycle are emitted. If greater than ``0``, there will be a gap in emissions before the next cycle begins.

----

.. _class_Particles2D_property_fixed_fps:

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

+-----------+----------------------+
| *Default* | ``0``                |
+-----------+----------------------+
| *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_Particles2D_property_fract_delta:

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

+-----------+-----------------------------+
| *Default* | ``true``                    |
+-----------+-----------------------------+
| *Setter*  | set_fractional_delta(value) |
+-----------+-----------------------------+
| *Getter*  | get_fractional_delta()      |
+-----------+-----------------------------+

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

----

.. _class_Particles2D_property_lifetime:

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

+-----------+---------------------+
| *Default* | ``1.0``             |
+-----------+---------------------+
| *Setter*  | set_lifetime(value) |
+-----------+---------------------+
| *Getter*  | get_lifetime()      |
+-----------+---------------------+

The amount of time each particle will exist (in seconds).

----

.. _class_Particles2D_property_local_coords:

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

+-----------+----------------------------------+
| *Default* | ``true``                         |
+-----------+----------------------------------+
| *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.

----

.. _class_Particles2D_property_normal_map:

- :ref:`Texture<class_Texture>` **normal_map**

+----------+-----------------------+
| *Setter* | set_normal_map(value) |
+----------+-----------------------+
| *Getter* | get_normal_map()      |
+----------+-----------------------+

Normal map to be used for the :ref:`texture<class_Particles2D_property_texture>` property.

**Note:** Godot expects the normal map to use X+, Y-, and Z+ coordinates. See `this page <http://wiki.polycount.com/wiki/Normal_Map_Technical_Details#Common_Swizzle_Coordinates>`__ for a comparison of normal map coordinates expected by popular engines.

----

.. _class_Particles2D_property_one_shot:

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

+-----------+---------------------+
| *Default* | ``false``           |
+-----------+---------------------+
| *Setter*  | set_one_shot(value) |
+-----------+---------------------+
| *Getter*  | get_one_shot()      |
+-----------+---------------------+

If ``true``, only one emission cycle occurs. If set ``true`` during a cycle, emission will stop at the cycle's end.

----

.. _class_Particles2D_property_preprocess:

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

+-----------+-----------------------------+
| *Default* | ``0.0``                     |
+-----------+-----------------------------+
| *Setter*  | set_pre_process_time(value) |
+-----------+-----------------------------+
| *Getter*  | get_pre_process_time()      |
+-----------+-----------------------------+

Particle system starts as if it had already run for this many seconds.

----

.. _class_Particles2D_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_Particles2D_property_randomness:

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

+-----------+-----------------------------+
| *Default* | ``0.0``                     |
+-----------+-----------------------------+
| *Setter*  | set_randomness_ratio(value) |
+-----------+-----------------------------+
| *Getter*  | get_randomness_ratio()      |
+-----------+-----------------------------+

Emission lifetime randomness ratio.

----

.. _class_Particles2D_property_speed_scale:

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

+-----------+------------------------+
| *Default* | ``1.0``                |
+-----------+------------------------+
| *Setter*  | set_speed_scale(value) |
+-----------+------------------------+
| *Getter*  | get_speed_scale()      |
+-----------+------------------------+

Particle system's running speed scaling ratio. A value of ``0`` can be used to pause the particles.

----

.. _class_Particles2D_property_texture:

- :ref:`Texture<class_Texture>` **texture**

+----------+--------------------+
| *Setter* | set_texture(value) |
+----------+--------------------+
| *Getter* | get_texture()      |
+----------+--------------------+

Particle texture. If ``null``, particles will be squares.

----

.. _class_Particles2D_property_visibility_rect:

- :ref:`Rect2<class_Rect2>` **visibility_rect**

+-----------+-----------------------------------+
| *Default* | ``Rect2( -100, -100, 200, 200 )`` |
+-----------+-----------------------------------+
| *Setter*  | set_visibility_rect(value)        |
+-----------+-----------------------------------+
| *Getter*  | get_visibility_rect()             |
+-----------+-----------------------------------+

The :ref:`Rect2<class_Rect2>` that determines the node's region which needs to be visible on screen for the particle system to be active.

Grow the rect if particles suddenly appear/disappear when the node enters/exits the screen. The :ref:`Rect2<class_Rect2>` can be grown via code or with the **Particles → Generate Visibility Rect** editor tool.

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

.. _class_Particles2D_method_capture_rect:

- :ref:`Rect2<class_Rect2>` **capture_rect** **(** **)** |const|

Returns a rectangle containing the positions of all existing particles.

----

.. _class_Particles2D_method_restart:

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

Restarts all the existing particles.

.. |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.)`