No, one 1 32 bit image is likely more efficient, less texture calls. However, 1 32 bit image is the same vmem cost as as 2 24 bit images. When we think about it that way, we can do some cool stuff with two maps: 1. 24 bit full color spec 2. 24 bit combo map R. Gloss G. Glow B. Reflection mask Or any other creative…
This is really a quirky way to do things, and sounds like something a programmer would come up with to torture artists. =P Unless you're really hurting for texture memory, a full 24 bit spec, with gloss in the alpha, is going to be by far the easiest and most sensible thing to do. I think the time saved by having your…