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Applying wetmap on top of existing materials?

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I've currently got a wetmap that I've got built into a principal shader based off a point cloud texture I wrote out for an entire model. 

How to I overlay the shader I’ve built on top of several existing materials so the wetmap shows on top of it? It works independently - but I've got no clue how to layer this on top of geo with several currently assigned materials. Any type of guidance would be very helpful. I’ve done a lot of research but I seem to not be on the right track for finding a solution to this.

Ideally, I'd like to use the point cloud data as an alpha if possible (I would like to avoid baking anything to textures though. I want to do everything within the shaders if possible.) , to merge two different shaders together...  but I'm a bit lost on the method here.

Scene File: WetMapHelp.hipnc





Edited by HappehLemons
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