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Add support for up to 65536 skeleton bones in skinned meshes

Browse Source 
https://forum.flaxengine.com/t/import-fbx-with-bones-more-than-256/1196
This commit is contained in:
Wojtek Figat
2025-01-08 18:48:50 +01:00
parent 1f294605a3
commit 3505b8971b
6 changed files with 123 additions and 8 deletions
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25
Source/Engine/Content/Assets/ModelBase.cpp
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@@ -613,6 +613,15 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
Array<GPUVertexLayout::Elements, FixedAllocation<MODEL_MAX_VB>> vbElements;
const bool useSeparatePositions = !isSkinned;
const bool useSeparateColors = !isSkinned;
PixelFormat blendIndicesFormat = PixelFormat::R8G8B8A8_UInt;
for (const Int4& indices : mesh.BlendIndices)
{
if (indices.MaxValue() > MAX_uint8)
{
blendIndicesFormat = PixelFormat::R16G16B16A16_UInt;
break;
}
}
{
byte vbIndex = 0;
// TODO: add option to quantize vertex positions (eg. 16-bit)
@@ -640,7 +649,7 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
vb.Add({ VertexElement::Types::Tangent, vbIndex, 0, 0, PixelFormat::R10G10B10A2_UNorm });
if (isSkinned)
{
vb.Add({ VertexElement::Types::BlendIndices, vbIndex, 0, 0, PixelFormat::R8G8B8A8_UInt });
vb.Add({ VertexElement::Types::BlendIndices, vbIndex, 0, 0, blendIndicesFormat });
vb.Add({ VertexElement::Types::BlendWeights, vbIndex, 0, 0, PixelFormat::R16G16B16A16_Float });
}
if (!useSeparateColors && hasColors)
@@ -714,8 +723,18 @@ bool ModelBase::SaveLOD(WriteStream& stream, const ModelData& modelData, int32 l
case VertexElement::Types::BlendIndices:
{
const Int4 blendIndices = mesh.BlendIndices.Get()[vertex];
const Color32 blendIndicesEnc(blendIndices.X, blendIndices.Y, blendIndices.Z, blendIndices.W);
stream.Write(blendIndicesEnc);
if (blendIndicesFormat == PixelFormat::R8G8B8A8_UInt)
{
// 8-bit indices
const Color32 blendIndicesEnc(blendIndices.X, blendIndices.Y, blendIndices.Z, blendIndices.W);
stream.Write(blendIndicesEnc);
}
else
{
// 16-bit indices
const uint16 blendIndicesEnc[4] = { (uint16)blendIndices.X, (uint16)blendIndices.Y, (uint16)blendIndices.Z, (uint16)blendIndices.W };
stream.Write(blendIndicesEnc);
}
break;
}
case VertexElement::Types::BlendWeights: