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Originally Posted by Lev
You will only notice quality decrease if you zoom in/zoom out a lot. In most cases you don't. Why would you need 12 layers of bump map anyways?
I do see one case where having procedural with a lot of layers is justified - landscape. It is huge and you are looking at only small parts at a time, and procedurals add good variation to texture. If this is what you were referring to, i agree with you. But for everything else? why?
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But if you render out those layers of reflections, bump maps, composites, etc you lose exactly what a procedural is all about.