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Adjusting auto generated uv's padding and scale

Is there a way to control how UE4 handles the padding and scaling of UV's when it creates a second set of UV's for light mapping? Currently I have several static meshes that have UV islands that are scaled smaller than the other UV islands. The light map UV's that get created have all UV islands scaled to relatively the same size. I would like to have control over how the generated UV's get scaled and packed.

Currently I'm creating my own second set of light map ready UV's in Maya but if I could control how they are generated and packed that would be one less step!

Thanks in advance,


Product Version: UE 4.11
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asked Jun 01 '16 at 05:40 PM in Rendering

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You have Control over the padding but nothing else. UE4 is not a Modeling tool after all ;P

And here is the part that gets a bit confusing. If you open your Mesh and look under LOD0->Build Settings->Min Lightmap resolution that Value basicly decides how much padding you get from the Autogenerated UVs if you set it lower it gives you bigger gaps because it expects Lightmaps to be of a smaller size therefore more padding to avoid bleeding. (Dont forget to hit the Apply Changes button to see the results)

But the real Lightmap Resoulution is under Static Mesh Settings->Light Map Resolution

So yeash if you want to have Full Control over UVs you have to stick with Maya.

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answered Jun 01 '16 at 06:16 PM

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avatar image smbv1 Jul 24 '17 at 06:27 PM

Do you know how to re-generate lightmap UV with lower padding? I have huge gaps, how to fix them without creating second UV map?

avatar image Nachtmahr Jul 24 '17 at 08:37 PM

Like described above. Hit Apply bellow. If you reffer to getting as much space as possible covered you got to Handcraft or use external tools that are specialized in doing so. Such as this one: http://store.steampowered.com/app/363020/IPackThat/

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