Format of the mesh index buffer data.
Index buffer can either be 16 bit (supports up to 65535 vertices in a mesh), or 32 bit (supports up to 4 billion vertices).
Default index format is 16 bit, since that takes less memory and bandwidth.
Note that GPU support for 32 bit indices is not guaranteed on all platforms; for example Android devices
with Mali-400 GPU do not support them. When using 32 bit indices on such a platform, a warning message will be
logged and mesh will not render.
See Also: Mesh.indexFormat, ModelImporter.indexFormat.
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