GlowWorm uses Poser's render engines to do the grunt work, so any memory limits are the same as Poser 6. There's quite a bit more info about render passes over on the DAZ thread. I just put up a sample PSD of render passes composited to recreate a normal render--you are encouraged to download it and tinker with it! We're posting our render-pass-remixes of the file over on the DAZ thread. Hope that helps!