Skip to main content

skin

The skin shader module provides GPU skinning helpers for skinned meshes, primarily for glTF-driven animation data.

Props​

scenegraphsFromGLTF?: unknown​

glTF scenegraph data used to build the joint matrix palette for the active skin. When absent, the module supplies an empty joint matrix array.

Uniforms​

The module exposes a joint matrix palette:

{
  jointMatrix: ['mat4x4<f32>', 20]
}

Usage​

Add the module to your shader and call getSkinMatrix(weights, joints) from the vertex shader to compute the blended skinning matrix for a vertex.

Shader Functions​

getSkinMatrix(weights, joints)​

Returns the weighted sum of the current joint matrices for the supplied joint indices and weights.

Remarks​

  • The current module packs up to 20 joints into the uniform block.
  • The module is designed around glTF skin data and expects the first skin in the supplied scenegraphsFromGLTF structure.