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Sets the index buffer for the sub-Mesh.
A sub-Mesh is simply a separate indices array. When the Mesh Renderer uses multiple Materials, you should
ensure that there are as many sub-Meshes as Materials.
SetTriangles and ::triangles always set the Mesh to be composed of triangle faces. Use SetIndices to create a Mesh composed of lines or points.
See Also: subMeshCount, MeshTopology enum.