Hi Daniel, here is an example scene attached. Pictures:
1.png - plane, teapot and 2 lights, black background (almost black)
2.png - shadow catcher checked for plane material (diffuse property takes background color)
3.png - background grey just to show that there are shadows there (and plane recieves the shadows). Same would be with image background
4.png - Alpha channel enabled
5.png - changed shadow intensity by light source (inside shadow catcher materials). Those shadow intensities are relative to each other. The higher the "shadow catcher" value of the light source the stronger the shadow.
6.png - Alpha channel displayed
I think we need more flexible AOV funtionality to collect various portions of image and various GI/reflection/refraction subimages.
CentiLeo for 3ds Max 0.541 available (nested glass objects and liquids, dirt shader, fixed bump mapping and other fixes)
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