EMSUSD-1061 - [GitHub #3631] Import support for left handed polygon m… - #4305
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seando-adsk merged 2 commits intoAug 26, 2025
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…eshes * Handle UVs correctly for left-handed prims.
seando-adsk
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Aug 20, 2025
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| if (isLeftHanded) { | ||
| // When the mesh is left-handed, face winding order was reversed. | ||
| // We need to adjust the face-vertex index to match the corrected order. | ||
| // Find the position of this vertex within its face and reverse it. | ||
| const int faceId = itFV.faceId(); | ||
| int vertexCount = meshFn.polygonVertexCount(faceId); | ||
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| // Find which vertex we are within this face | ||
| unsigned int baseFvi = 0; | ||
| for (int f = 0; f < faceId; ++f) { | ||
| int faceVertCount = meshFn.polygonVertexCount(f); | ||
| baseFvi += faceVertCount; | ||
| } | ||
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| const int vertexPosInFace = fvi - baseFvi; | ||
| const int reversedVertexPosInFace = vertexCount - 1 - vertexPosInFace; | ||
| valueId = baseFvi + reversedVertexPosInFace; | ||
| } else { | ||
| valueId = fvi; | ||
| } |
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Handle UVs for left-handed meshes. See #1139 where a change was made to support faces correctly for left-handled meshes. That PR fixed that problem but exposed this problem with the UVs.
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EMSUSD-1061 - [GitHub #3631] Import support for left handed polygon meshes