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Detect Back Faces

Hey there,

I have a shader cutting geometry using alpha test, and I am trying to fill this gaps. I tried various methods, but nothing kinda worked.

I've got another idea which would use a postprocess material to lerp between the sceneColor and a customColor to fill those gaps, but I miss the alpha to perform this lerp operation. As an alpha for this operation I thought to use the TwoSided sign to check if the pixel I am rendering is a backface, but it doesn't seem to be possible in a postprocess material. Is there a way that I can know if a pixel is a backface in the postprocess material? If not, can I write to a custom postprocess input in the object shader so I can use it later in the postprocess one?


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asked Mar 23 '19 at 10:49 PM in Rendering

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Iacopo Antonelli
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