How to set float or float4 UV in Mesh.

Question

Hello. I'm trying to create a shader that supports an outline. My approach is to assign barycentric coordinates to each triangle of a face. These are 3 dimensional.

I know Unity's UVs support float3 or float4. Is there a way that I can pass that to the Mesh? If not, do I have to create my own Mesh-like data structure that communicates directly with the shader?

Thanks!

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Answer by maxmet · Jan 05, 2018 at 12:18 PM

Ok, progress. https://docs.unity3d.com/ScriptReference/Mesh-uv.html misled me into thinking that 2D UVs were the only option with meshes.

I've found https://docs.unity3d.com/ScriptReference/Mesh.SetUVs.html now, which suggests that isn't the case! Will post here again if I have trouble using it.

Hope it helps someone who was confused by the documentation page too.

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maxmet · Jan 05, 2018 at 12:33 PM 0

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It worked fine.

BassaForte · Oct 21, 2018 at 08:47 PM 0

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But what does your shader look like? I'm having trouble getting my shader to use float3 for the uv coords, getting a compile error "cannot implicitly convert 'const float2' to 'float3'" in the generated shader code.

Bunny83 BassaForte · Oct 21, 2018 at 10:16 PM 0

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Your comment is out of the scope of this question. Please ask a seperate question and include your not working code.

How to set float or float4 UV in Mesh.

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