No, the one with 2 spheres are also different sizes, 20.48, and 21.00 I believe. Although the exact sizes don't matter, as long as the sphere with the galss mat on it is the slightly larger one(s). Yeah, it adds to the render time, since it has to calculate transparency, reflection, refractio, etc. The render up there takes 60 seconds to render vs. just 30 seconds if I just have 4 "plain wood" spheres. So...in a very shakey theory, it could double your render times, but when does adding glass not double render times, lol? AS

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