I'm designing a program that randomly creates landing site scenery, and I want to be able to change the textures of the rocks. According the Orbiter.pdf file, all I have to do is replace OWNMATERIALS with TEX and the name of the texture file I want to use. However when I try that, the new texture either doesn't appear (the mesh is blank), or the entire mesh disappears. Anybody else have any experience with this?