I’ve tried redoing the UV mapping on my asset using Autodesk Maya, and it says in Maya that I have 0 overlapping UV’s for my objects, but when I import them to UE4 and try to build the lighting I get a warning that two of the objects have overlapping UVs. One with 25 or so percent overlapping and the other with 50%. I also noticed some of the edges on the object became distorted during the import. Any help is greatly appreciated.
Some pictures would help.
My guess is that your model in maya has more than one UV channel. The first UV channel (0) is always for textures and the second channel (1) is for lightmaps. You can generate lightmaps in engine though. It’s a hunch.
By default the engine will try to generate lightmaps to a new UV channel, if you’ve made your lightmaps (as said before, the first channel is for textures, second is expected to be for lightmaps) then you need to turn off Auto Generate Lightmap UV’s when you import and it’ll automatically set the second channel to be used for lightmaps.
Also, there’s a default lightmap resolution that’s very low, if a pixel is big enough in the lightmap to cross over multiple UV islands then it will give the error that the UV’s are overlapping because technically there’s some coordinates that are on the same pixel.