[Help] Light Leaks on solid static mesh

[Neuxs412]

@darthviper107;631509

Your floor/walls/ceiling all need to line up in the corners exactly. If you have a plane for the floor and it goes underneath the wall then the lightmap can’t line up exactly where the wall is so you get bleeding.

Also, your lightmap UV is not good, looks like you used auto flatten UV’s and that always gets poor results, it ends up with too many unnecessary splits and in an ideal situation you want your UV islands to be similar in size for best results. If you do them manually, you can make sure that those small islands don’t get separated out as much. Also, for long surfaces, like if you have a very long wall you can split it half in the UV’s (add a segment there to the mesh if you don’t have one so you can split it) and that will help utilize space better.
Rule of thumb for lightmap UV’s is have the least number of seams and try to make your UV islands similar in size. In some cases you can just resize the small islands to be bigger even though they won’t be in-scale.

thanks! i actually did use auto flatten for that particular uv and i already did the unwrapping myself but it was to no avail. the light leak, i believe, had more to do with distance than UVs because the leak on the wall seam is actually a solid UV(dont know if that makes sense), its part of the same island as the adjacent wall. but yeah, Uving myself actually helped a lot on some other artefacting that i was having.

anyways, the article i posted earlier actually cleared up all my lighting problems, although it did raise light build times tremendously, and the results are wonderful.