glass problem

ask ko lang po mga master, bakit po pag nilalagyan ko ng thickness yung glass ko, iba po yung reflection behind the glass (color & direction). minsan naman po, iba yung kulay ng object behind and not the way it shoud be... usually, blue ang kulay ng object na nagrereflect behind the glass.

note: double sided, unchecked.



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magbasa....
http://www.cgpinoy.org/vray-for-sketchup-tutorials-f97/nomeradona-s-glass-tutorial-using-vraysketchup-t6024.htm