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Overlapping Lightmap UVs in UE4

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  • Overlapping Lightmap UVs in UE4

    Hello everybody,

    I modelled some trees in the SpeedTree Modeler v8.4.2 to use them in UE4. However no matter what I do, I can't get the Lightmaps to work in Unreal. I always receive the error message telling me, that I have overlapping UVs.
    As far as I can tell from the little preview window in SpeedTree there are no overlapping shells. Changing the target resolution and the display multiplier only changes the percentage of overlapping UVs.
    I also tried changing the Unwrap mode of my clusters but that doesn't do anything.

    So no matter what I try I can't figure it out and I also could not find any other support threads where someone succesfully solved this.

    I really hope someone can help me with this!

  • #2
    Hi Dark Sheep, sorry you're having issues! Do you have backs turned on for the fronds. Is there a photogrammetry mesh or unwrapped mesh in your scene? Usually that error will show from imported static meshes. You mentioned the clusters....are you creating this in a different program and bringing them in?