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Microfacet Refractions


jkunz07

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Hey,
 

Has anyone have any ideas on how to do something like this in Houdini/Mantra?

 

 

https://www.cs.cornell.edu/~srm/publications/EGSR07-btdf.html

I've tried manipulating the refracting angle similar to how I would a reflection angle but that doesn't seem to be working.

 

Reflection angle from 0 to 90

post-6960-0-50062900-1392846872_thumb.jp

 

Refraction angle from 0 to 90

post-6960-0-79131700-1392846881_thumb.jp

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