I know that I m probably missing something really stupid but I have imported in unreal a model and I made 2 uv channel as usual and I didn’t have any problem until I rebuild the light and this is the result :
I have already try to make a new uv channel for light but nothing and I also tried to make with unreal but nothing and in the end I also put an higher light map resolution.
Could some one help me with this? I don’t really know what should I try .
Even though you said you’ve looked at your UV channels and upped your lightmap resolution the problem can still potentially be there.
Can you post a screen shot of your 2nd UV channel? If there are an overlapping UVs you’ll get this kind of error. Also, all of your UVs need to be in the 0 to 1 space to light correctly.
Here is my second UV channel but there aren’t any overlapping UVs and is on channel 1.
However when I finish to built lights it’s saying that there is 97% of overlapping but the only overlapping UVs are on channel 0 because the leaves and the trunk have different materials and before unreal different UV but until now i never have problem with overlapping in channel 0 or is anyway wrong do that?
Looking at the UV you’ve posted here it does appear that this could be the cause of your issue. Some of the polygons for the cactus do appear to be fairly close together. You may want to use a relax tool/modifier give your cactus more spacing.
