OpenCascade Mesh

[starhopper1]

Hi
i have a little tool that converts step to glb. I am using opencascade and for now i reload the glb in gltfpack and override the original from opencascade with the gltfpack one. I am looking for a way to use the mesh directly without the need to reload the glb, maby someone has something similar and can give me a direction. I don´t find the mesh.. i guess it has to be in the TopoDS_Shape from opencascade.. and gltfpack uses vector.
Hope someone can help me.