Originally posted by **BoyBaykiller** April 22, 2024
I am running `gltfpack -v -mi -noq -tc -i .\SimpleInstancing.gltf -o .\Compressed\Output.gltf` over [this](https://github.com/KhronosGroup/glTF-Sample-Models/tree/main/2.0/SimpleInstancing/glTF) gltf model.
It uses the EXT_mesh_gpu_instancing extension to define a bunch of instanced cubes. I can render it correctly as it, but after running it through the command the EXT_mesh_gpu_instancing extension is removed, resulting in only a single cube being rendered.
Discussed in https://github.com/zeux/meshoptimizer/discussions/680