Try Print FileType("name.b3d") instead, if it is 1, the file exists.
Then, try Print LoadMesh("name.b3d"), if it is zero, the file is not compatible with Blitz, else the mesh is loaded.
And you have to load meshes after setting Graphics3D.
Then, try Print LoadMesh("name.b3d"), if it is zero, the file is not compatible with Blitz, else the mesh is loaded.
And you have to load meshes after setting Graphics3D.