Get mesh edges with shader | Bevy | Page 1

clear surge Oct 10, 2025, 5:50 AM

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I'm wondering how I would use a shader to detect (proximity to) the edges of a mesh. I know I could use a post-processing shader to acheive this, but since I'm just trying to create a procedural material and not a visual effect, I feel like it's a little overkill.

I've been looking for options to the effect of getting the derivative of the mesh normal (which would (maybe?) be the ideal solution), but I haven't found anything so far.

I feel like there might be something obvious I'm missing here, but I can't think of it.

light cypress Oct 12, 2025, 2:18 AM

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For toon shading? Or something like a Sobel?

clear surge Oct 14, 2025, 2:03 AM

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light cypress For toon shading? Or something like a Sobel?

just for a weathering shader, i want to get sharp normal gradients and scale the weathering according to that

light cypress Oct 14, 2025, 2:04 AM

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weathering shader? to make materials look 'older' 'weather' exposed kinda thing?

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if you want it to be geometrically aware you'll need to detect edges, or pass additional info to the fragment from the vertex (hard within bevy)

clear surge Oct 14, 2025, 2:24 AM

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yeah with further research that's about what i found, bevy limitations are what's getting me here

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I've been working on other stuff and this is low priority so I'll probably put it off until it's a little more possible 😅

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otherwise if needs be I'll just use a post process shader and try not to tear my hair out when it causes problems lol

#Get mesh edges with shader