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I need some help with #unity3d shaders! I am trying to figure out a way to detect coinciding *faces* of meshes and color them in in a separate color. I tried drawing the meshes twice, once with additive blending, and then another time with a GrabPass{} and a Surface Shader [1/]On twitter.com
Mood +2 🙂
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...but this way I can only detect whether the faces overlap in screen-space, but this means that if one Mesh is behind the other that is also considered an "overlap": gfycat.com/SevereWavyCaracal [2/]Permalink On twitter.com
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I would like to only detect coinciding faces, e.g. when the two Cubes are at the same position, or only a half side-length apart on a single axis. I tried to use "DepthTest Equal" but it seems to be too unreliable. [3/]Permalink On twitter.com
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How can I do this? I understand rounding/float equality is an issue here, but there with a specific error margin/window it would be fine right? [4/4]Permalink On twitter.com
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paging @totallyRonja One Idea that I have left but that seems wasteful is to render each Mesh (in this case there is a max of 4 of them) to its own RenderTexture and then either re-render each one or a full-screen quad with the four RenderTextures attached for lookups.Permalink On twitter.com