Hi all...
Here's a simple quick tip that is good to know. If you are mapping transparency and need accurate raytrace shadows, set the Shadow Attenuation on your material to 0. It used to behave this way by default, but I guess Autodesk decided to mess with us a little..
example problem: (click to enlarge)
solution: change shadow attenuation to zero: (click to enlarge)
Result: much better... (click to enlarge)
Tutorial by : Alex Alvarez
Original Source : http://www.thegnomonworkshop.com/store/product/479/Transparency-Shadows---Mental-Ray
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