I hadn't thought of that -- I assume you're applying the texture to the entire model under 'Color and texture.' I can see two potential issues, though: First, you still have the problem Emmanuel is currently wrestling: Namely, the 2D bounding box is potentially larger than the maximum dimensions of all currently visible objects. (It's undoubtedly not a problem for you, since you're explicitly "invisible-ing" objects and would be aware of the disconnect.) Second, under some circumstances invisible textures aren't always invisible, as shown in this comment. But, with those caveats, your approach is definitely worth giving a try.