I made this model with the plugin Rich suggested: http://sketchup.google.com/3dwarehouse/details?mid=bc92eca8611ed04d2470944666440e50 Then just out of curiosity, I simply reloaded the Earth image with a Mars image and it kept the spherical UV mapping perfectly: http://sketchup.google.com/3dwarehouse/details?mid=6ed69ca0de0718c2bb014d52f42fdd7f so you can even use either model any reload the image in them.