Class reference
GPUParticlesCollisionHeightField3D
Inherits GPUParticlesCollision3D
A real-time heightmap-shaped 3D particle collision shape affecting GPUParticles3D nodes.
Description
A real-time heightmap-shaped 3D particle collision shape affecting 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 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: ParticleProcessMaterial.collision_mode must be true on the GPUParticles3D's process material for collision to work. Note: Particle collision only affects GPUParticles3D, not CPUParticles3D.
Properties
bool follow_camera_enabled = false
bool follow_camera_enabled = falseIf true, the GPUParticlesCollisionHeightField3D will follow the current camera in global space. The GPUParticlesCollisionHeightField3D does not need to be a child of the 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 resolution to improve performance if follow_camera_enabled is true.
int heightfield_mask = 1048575
int heightfield_mask = 1048575The visual layers to account for when updating the heightmap. Only MeshInstance3Ds whose VisualInstance3D.layers match with this heightfield_mask will be included in the heightmap collision update. By default, all 20 user-visible layers are taken into account for updating the heightmap collision. Note: Since the heightfield_mask allows for 32 layers to be stored in total, there are an additional 12 layers that are only used internally by the engine and aren't exposed in the editor. Setting heightfield_mask using a script allows you to toggle those reserved layers, which can be useful for editor plugins. To adjust heightfield_mask more easily using a script, use get_heightfield_mask_value() and set_heightfield_mask_value().
int resolution = 2
int resolution = 2Higher resolutions can represent small details more accurately in large scenes, at the cost of lower performance. If update_mode is UPDATE_MODE_ALWAYS, consider using the lowest resolution possible.
Vector3 size = Vector3(2, 2, 2)
Vector3 size = Vector3(2, 2, 2)The collision heightmap's size in 3D units. To improve heightmap quality, size should be set as small as possible while covering the parts of the scene you need.
int update_mode = 0
int update_mode = 0The update policy to use for the generated heightmap.
Methods
bool get_heightfield_mask_value(int layer_number) const
bool get_heightfield_mask_value(int layer_number) constReturns true if the specified layer of the heightfield_mask is enabled, given a layer_number between 1 and 20, inclusive.
void set_heightfield_mask_value(int layer_number, bool value)
int layer_number, bool value)Based on value, enables or disables the specified layer in the heightfield_mask, given a layer_number between 1 and 20, inclusive.
Constants
RESOLUTION_256 = 0
Generate a 256×256 heightmap. Intended for small-scale scenes, or larger scenes with no distant particles.
RESOLUTION_512 = 1
Generate a 512×512 heightmap. Intended for medium-scale scenes, or larger scenes with no distant particles.
RESOLUTION_1024 = 2
Generate a 1024×1024 heightmap. Intended for large scenes with distant particles.
RESOLUTION_2048 = 3
Generate a 2048×2048 heightmap. Intended for very large scenes with distant particles.
RESOLUTION_4096 = 4
Generate a 4096×4096 heightmap. Intended for huge scenes with distant particles.
RESOLUTION_8192 = 5
Generate a 8192×8192 heightmap. Intended for gigantic scenes with distant particles.
RESOLUTION_MAX = 6
Represents the size of the Resolution enum.
UPDATE_MODE_WHEN_MOVED = 0
Only update the heightmap when the GPUParticlesCollisionHeightField3D node is moved, or when the camera moves if follow_camera_enabled is true. An update can be forced by slightly moving the GPUParticlesCollisionHeightField3D in any direction, or by calling RenderingServer.particles_collision_height_field_update().
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.