VertexInfluence

Remarks

A byte an index and a byte a weight, which is not a compromise. Skinning.MaxBones is 256 because 256 mat4s is exactly the 16 KB of uniform range Vulkan guarantees — so a byte indexes the largest palette the engine has, exactly. And a weight quantized to a 255th is finer than the position it is applied to, which a page stores as a 65535th of the mesh's longest extent: a character two metres tall carries positions to a thirtieth of a millimetre, and the weight error moves a vertex by less than that.

Four influences, matching BonePalette and the glTF the importer reads. The fifth is below the weight threshold in every asset that has one.

Fields and properties (3)

• public Int4 Bones

  Their indices into the mesh's skeleton, in the order the weights are.

• public Vector4 Weights

  Their weights, as stored — which is to say not exactly summing to one.

• public Vector4 Normalized

  The weights, normalised to sum to one.

Methods (2)

• public VertexInfluence(Int4 Bones, Vector4 Weights)

  The four bones one page vertex is weighted to, decoded.

• public Matrix4x4 Blend(ReadOnlySpan<Matrix4x4> palette, int firstBone)

  The one matrix this vertex is transformed by.

Used by (3)

• MeshletPageSetVixen.Rendering.VirtualGeometry
• SkinnedClusterTestsVixen.Rendering.Tests
• SkinnedPageTestsVixen.Editor.Assets.Tests