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Hi I came across this paper about nested materials http://graphics.cs.ucdavis.edu/~bcbudge/deep/research/nested_dielectrics.pdf This technique can be very useful for rendering complex glass and water surfaces. Have anybody of you tried that with mantra? Or do you think it would be difficult to implement something like that in Mantra? I tried this technique with Arnold (author of the paper created also jf_nested_dielectric shader for Arnold) in Houdini and it was really cool. It works very well for scenario: bottle with droplets of water on it. So preparing geometry for droplets is easy as it can intersect bottle's surface but in rendering there will be visible only bottle on intersection (because of priority in nested materials).
