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I have a shot that I'm working on, where I have tracked footage and brought it into Houdini.


The issue I'm having is that I want to render the shapes without the stairs from Houdini, however if I turn the stair layer off then the stairs won't cut into the shapes like it needs to as the shape is sitting on the step? I know in Maya, you would use a surface_shader for this but I have no idea what the equivalent to that would be in Houdini.


I have attached image to show what I mean as I'm not the best at explaining things.


Any help at all would be great!


Thanks, Mel.



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you can also use shadow matte shader on stairs so you get objects shadows on the "invisible stairs"

then render objects separate with stairs as phantom>under render tab on geometry node

then you should have all to do the comp

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