UV map of the object always has a small offset

Support Materials and Textures
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Hey guys, I want to create a TrimSheet for my project, which is why I first want to create a color id map. I have what I think is a simple object, namely a plain with a few cuts. I simply unwrapped this and then marked individual faces and filled them with a color in “Texture Paint” mode.

But now I notice that if you look closely, the areas of the UV map are slightly offset from the faces on which I painted the texture. That for “bleeding-edges”.
I can’t explain what I’m doing wrong.

Can someone please explain this to me?
I’ve attached the blend file here.
trim-sheet-loft.blend (1018.6 KB)

image
image1671×875 54 KB

image
image1477×722 41.5 KB

image
image1529×770 36 KB

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Thats aliasing.Thats not particularly a trimsheet problem. Its generally a value problem when you convert a floating point uv to a discrete number for a specific texel fetch. Its generally more prominent with low texture resolutions like it happens in mipmapping. Thats the reason why uvpatches should have a gap between them

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sfasf
sfasf927×885 66.6 KB

asfsf.blend (1.0 MB)

You can try it another way.
You can separate all connected faces and paint them with vertex paint.

I used an addon and randomly assigned colors.

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So @Debuk do you think that if I create a graphic that is larger than before, the chance of avoiding the problem increases?

Thanks for the tip @oo_1942 , I’ll take a look at the addon. Maybe this is the right way.

I give feedback on which way worked here and how successful it was.

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You mean a bigger texture resolution? Yes it will get smaller / less visibible with a higher texture res. Its influenced by the texture resolution the amount of pixels of the screen area it occupies, the difference in color of your neighboring patches in the texture and specific underlying texture filtering / interpolation method.

So try to increase the image res and change the interpolation method used in the image texture node.