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I think it depends on what you mean by objects. If you mean Poser figures, people sometimes clothe and pose a figure and then export it as a single .obj file. You can then delete the figure and import the .obj. Now you have only the geometry, minus the overhead of .cr2(s), .hr2 etc. which may contain morphs and other data. You won't be able to pose the figure any more but you'll save memory. I'm not sure if you'll save any render time though. This technique still requires the multiple texture files and in some cases, you may have to play with the material assignments to get them right. This figure is a 5.8 MB .obj but the hair file alone is almost 11 MB. I don't see why you couldn't use UVMapper to create one big map for the resulting .obj file. It could get complicated if you have a lot of materials though. You might save some memory but again, I doubt you'd gain any speed. As for using a single texture from the screen, this thread talks about the closest thing I've seen to that but it requires a fair amount of work.
"Democracy is a pathetic
belief in the collective wisdom of individual ignorance." - H. L.
Mencken