8fbff1a3b7
Based on feedback (thnx phase!) I found a big disadvantage of the 'real' fresnel formula. It doesnt degrade to 0.0, causing 2-3 times too many rays being fired compared to the previous one. So; a lot slower. Now committed is a hybrid which allows (close to) real, and nice artistic freedom, *and* it really goes to 0.0 and 1.0, assisting nicely in optimal render times. A real doc how it works (with pics) will be made before real release. - Fixed bug in raytrace: the first renderpass didn't use fresnel for mirror. - Fixed bug in previewrender, now it closer matches how fresnel renders
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