GatheredMesh?
ConvertColliderToGatheredMesh
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Rasterizes a collider to a mesh assuming it's vertices should be multiplied with the matrix.
Note that the bounds of the returned RasterizationMesh is based on collider.bounds. So you might want to call myExtraMesh.RecalculateBounds on the returned mesh to recalculate it if the collider.bounds would not give the correct value.