godot-docs/classes/class_gpuparticlescollisionheightfield3d.rst

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.. _class_GPUParticlesCollisionHeightField3D:

GPUParticlesCollisionHeightField3D
==================================

**Inherits:** :ref:`GPUParticlesCollision3D<class_GPUParticlesCollision3D>` **<** :ref:`VisualInstance3D<class_VisualInstance3D>` **<** :ref:`Node3D<class_Node3D>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

A real-time heightmap-shaped 3D particle collision shape affecting :ref:`GPUParticles3D<class_GPUParticles3D>` nodes.

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

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

A real-time heightmap-shaped 3D particle collision shape affecting :ref:`GPUParticles3D<class_GPUParticles3D>` nodes.

Heightmap shapes allow for efficiently representing collisions for convex and concave objects with a single "floor" (such as terrain). This is less flexible than :ref:`GPUParticlesCollisionSDF3D<class_GPUParticlesCollisionSDF3D>`, but it doesn't require a baking step.

\ **GPUParticlesCollisionHeightField3D** can also be regenerated in real-time when it is moved, when the camera moves, or even continuously. This makes **GPUParticlesCollisionHeightField3D** a good choice for weather effects such as rain and snow and games with highly dynamic geometry. However, this class is limited since heightmaps cannot represent overhangs (e.g. indoors or caves).

\ **Note:** :ref:`ParticleProcessMaterial.collision_mode<class_ParticleProcessMaterial_property_collision_mode>` must be ``true`` on the :ref:`GPUParticles3D<class_GPUParticles3D>`'s process material for collision to work.

\ **Note:** Particle collision only affects :ref:`GPUParticles3D<class_GPUParticles3D>`, not :ref:`CPUParticles3D<class_CPUParticles3D>`.

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

Properties
----------

.. table::
   :widths: auto

   +-----------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------+----------------------+
   | :ref:`bool<class_bool>`                                               | :ref:`follow_camera_enabled<class_GPUParticlesCollisionHeightField3D_property_follow_camera_enabled>` | ``false``            |
   +-----------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------+----------------------+
   | :ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` | :ref:`resolution<class_GPUParticlesCollisionHeightField3D_property_resolution>`                       | ``2``                |
   +-----------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------+----------------------+
   | :ref:`Vector3<class_Vector3>`                                         | :ref:`size<class_GPUParticlesCollisionHeightField3D_property_size>`                                   | ``Vector3(2, 2, 2)`` |
   +-----------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------+----------------------+
   | :ref:`UpdateMode<enum_GPUParticlesCollisionHeightField3D_UpdateMode>` | :ref:`update_mode<class_GPUParticlesCollisionHeightField3D_property_update_mode>`                     | ``0``                |
   +-----------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------+----------------------+

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

----

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

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

.. _enum_GPUParticlesCollisionHeightField3D_Resolution:

.. rst-class:: classref-enumeration

enum **Resolution**:

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_256:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_256** = ``0``

Generate a 256×256 heightmap. Intended for small-scale scenes, or larger scenes with no distant particles.

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_512:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_512** = ``1``

Generate a 512×512 heightmap. Intended for medium-scale scenes, or larger scenes with no distant particles.

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_1024:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_1024** = ``2``

Generate a 1024×1024 heightmap. Intended for large scenes with distant particles.

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_2048:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_2048** = ``3``

Generate a 2048×2048 heightmap. Intended for very large scenes with distant particles.

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_4096:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_4096** = ``4``

Generate a 4096×4096 heightmap. Intended for huge scenes with distant particles.

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_8192:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_8192** = ``5``

Generate a 8192×8192 heightmap. Intended for gigantic scenes with distant particles.

.. _class_GPUParticlesCollisionHeightField3D_constant_RESOLUTION_MAX:

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

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **RESOLUTION_MAX** = ``6``

Represents the size of the :ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` enum.

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----

.. _enum_GPUParticlesCollisionHeightField3D_UpdateMode:

.. rst-class:: classref-enumeration

enum **UpdateMode**:

.. _class_GPUParticlesCollisionHeightField3D_constant_UPDATE_MODE_WHEN_MOVED:

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

:ref:`UpdateMode<enum_GPUParticlesCollisionHeightField3D_UpdateMode>` **UPDATE_MODE_WHEN_MOVED** = ``0``

Only update the heightmap when the **GPUParticlesCollisionHeightField3D** node is moved, or when the camera moves if :ref:`follow_camera_enabled<class_GPUParticlesCollisionHeightField3D_property_follow_camera_enabled>` is ``true``. An update can be forced by slightly moving the **GPUParticlesCollisionHeightField3D** in any direction, or by calling :ref:`RenderingServer.particles_collision_height_field_update<class_RenderingServer_method_particles_collision_height_field_update>`.

.. _class_GPUParticlesCollisionHeightField3D_constant_UPDATE_MODE_ALWAYS:

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

:ref:`UpdateMode<enum_GPUParticlesCollisionHeightField3D_UpdateMode>` **UPDATE_MODE_ALWAYS** = ``1``

Update the heightmap every frame. This has a significant performance cost. This update should only be used when geometry that particles can collide with changes significantly during gameplay.

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

----

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

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

.. _class_GPUParticlesCollisionHeightField3D_property_follow_camera_enabled:

.. rst-class:: classref-property

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

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

- void **set_follow_camera_enabled** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_follow_camera_enabled** **(** **)**

If ``true``, the **GPUParticlesCollisionHeightField3D** will follow the current camera in global space. The **GPUParticlesCollisionHeightField3D** does not need to be a child of the :ref:`Camera3D<class_Camera3D>` node for this to work.

Following the camera has a performance cost, as it will force the heightmap to update whenever the camera moves. Consider lowering :ref:`resolution<class_GPUParticlesCollisionHeightField3D_property_resolution>` to improve performance if :ref:`follow_camera_enabled<class_GPUParticlesCollisionHeightField3D_property_follow_camera_enabled>` is ``true``.

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

----

.. _class_GPUParticlesCollisionHeightField3D_property_resolution:

.. rst-class:: classref-property

:ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **resolution** = ``2``

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

- void **set_resolution** **(** :ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` value **)**
- :ref:`Resolution<enum_GPUParticlesCollisionHeightField3D_Resolution>` **get_resolution** **(** **)**

Higher resolutions can represent small details more accurately in large scenes, at the cost of lower performance. If :ref:`update_mode<class_GPUParticlesCollisionHeightField3D_property_update_mode>` is :ref:`UPDATE_MODE_ALWAYS<class_GPUParticlesCollisionHeightField3D_constant_UPDATE_MODE_ALWAYS>`, consider using the lowest resolution possible.

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

----

.. _class_GPUParticlesCollisionHeightField3D_property_size:

.. rst-class:: classref-property

:ref:`Vector3<class_Vector3>` **size** = ``Vector3(2, 2, 2)``

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

- void **set_size** **(** :ref:`Vector3<class_Vector3>` value **)**
- :ref:`Vector3<class_Vector3>` **get_size** **(** **)**

The collision heightmap's size in 3D units. To improve heightmap quality, :ref:`size<class_GPUParticlesCollisionHeightField3D_property_size>` should be set as small as possible while covering the parts of the scene you need.

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

----

.. _class_GPUParticlesCollisionHeightField3D_property_update_mode:

.. rst-class:: classref-property

:ref:`UpdateMode<enum_GPUParticlesCollisionHeightField3D_UpdateMode>` **update_mode** = ``0``

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

- void **set_update_mode** **(** :ref:`UpdateMode<enum_GPUParticlesCollisionHeightField3D_UpdateMode>` value **)**
- :ref:`UpdateMode<enum_GPUParticlesCollisionHeightField3D_UpdateMode>` **get_update_mode** **(** **)**

The update policy to use for the generated heightmap.

.. |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.)`