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HtoA shadow matte alpha

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Hi guys, 

I'm having trouble setuping a simple shadow matte material in Arnold for houdini, I don't know how to lay out my network to get only the shadows in the alpha channel of the grid:

01_default render

02_shadow matte render but wrong alpha

03_other failed attempt



Any insight on how to properly use the shadow matte node ?


Thanks a lot !





Edited by tious13

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