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def gather_mesh_hook(gltf_mesh, bl_mesh, ...):
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for primitive in gltf_mesh:
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alpha_map = gltf_mesh.material.baseColorTexture
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if alpha_map:
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indices = gltf_access(primitive.indices)
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tex_coords = gltf_access(primitive.tex_coords)
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primitive.extension = micromaps_extension(...)
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