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« on: 2015-02-12, 18:16:02 »
Just tried this out as I couldn't really believe that this would happen but I get exactly the same result as you. When the object is behind glass, as the luminance value of the material goes down it seems that a black hole effect appears and grows in size related to this luminance value. The effect goes away once the luminance value increases. However when using 999 to disable fresnel and putting a falloff map in the reflection colour slot, this black hole never disappears at any luminance value and even at high gloss like 0.9. At 1.0 gloss it seems ok.
The strength of the light in the scene makes a big difference as well. At lower strengths the black hole fades away. Using a HDR to light rather than Corona sun or a Corona light rendered the object perfectly.