ParticleField3DGaussianSplat

A ParticleField that represents the original 3D Gaussian Splats technique.

It inherits from the ParticleField base prim, and has a set of built-in schema to provide the required attributes to define the necessary data from the original 3DGS paper.

It also contains rendering hints that can optionally inform how the splats should be rendered. These hints typically correlate with choices that were made when the data was trained.

Properties

projectionModeHint

USD type: token

Fallback value: perspective

A renderer hint on how to project the Gaussian to achieve a perspective correct view. Renderers are free to ignore this, but the hint is often valuable to tune the rendering of the scene. It often corresponds to a choice made when training the data.

The hint can be one of the following:

perspective: Perspective projection is similar to standard object rendering from a camera view. Gaussians are projected with scaling and distortion based on depth.
tangential: Tangential projection treats the image plane as a tangent to the viewing sphere. Gaussians are projected orthogonally, preserving shape and scale better, which helps reduce distortion for certain rendering applications like novel view synthesis.

sortingModeHint

USD type: token

Fallback value: zDepth

A renderer hint on how to sort the Gaussian while drawing. Renderers are free to ignore this, but the hint is often valuable to tune the rendering of the scene. It often corresponds to a choice made when training the data.

Rasterizers usually sort Gaussians from back to front. This attribute is a hint for the metric used to sort the Gaussians with respect to the camera.

The hint can be one of the following:

zDepth: The particles are sorted based on the Z component of the particle position when transformed into the camera’s local space.
cameraDistance: The particles are sorted based on the Euclidian distance from the particle to the camera.

Inherited Properties (Gprim)

doubleSided

USD type: bool

Fallback value: False

orientation

USD type: token

Fallback value: rightHanded

primvars:displayColor

USD type: color3f[]

primvars:displayOpacity

USD type: float[]

Inherited Properties (Boundable)

extent

USD type: float3[]

Inherited Properties (Xformable)

xformOpOrder

USD type: token[]

Inherited Properties (Imageable)

proxyPrim

USD type: rel (relationship)

purpose

USD type: token

Fallback value: default

visibility

USD type: token

Fallback value: inherited