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this... it's a video tutorial I made for glass using free assets
youtube.com/watch?v=rXNv9EPHyHw –  Wesley Weaver Mar 16 '13 at
22:02 add comment  1 Answer  You need to attach different
materials on transparent and opaque objects. Then, if you assign
a transparent shader to transparent surfaces, the light will go
through. Another approach could be detaching glasses on the
modeling program, create and assign some other layer for the
glass parts and have the light ignore that layer.  share|improve
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