All materials (brushes) in your b3ds have 2 texture layers but main texture in all meshes use second layer - first is empty (and a few of they have lightmap texture on first layer). I don't know but maybe this generate a problem for minib3d's loader/parser or renderer.
[EDIT] if you add
CameraClsColor cam, 255,0,0
Wireframe True
then you can see that you are inside your level but all materials are black.
[EDIT2]
After a few tests it looks like problems with blendings. Materials are black when texture in diffuse (color) layer have a multiply (or multiply x2) blending flag.
[EDIT] if you add
CameraClsColor cam, 255,0,0
Wireframe True
then you can see that you are inside your level but all materials are black.
[EDIT2]
After a few tests it looks like problems with blendings. Materials are black when texture in diffuse (color) layer have a multiply (or multiply x2) blending flag.