Hi,there is a problem if you use ncc 1701 (the link is http://www.ShareCG.com/v/61997/view/5/3D-Model/NCC-1701-spaceship )
and constellation models in the same scene in bryce, because some textures have the same name, so that textures are mixed. Open the .mtl file of ncc 1701 model and prefix every texture name with the 3 characters ncc.
Don’t change materials name (newmtl materialname).
Save the .mtl file
Then rename the textures in the folder prefixing with ncc.
Now you can have both models in the same scene with their textures.