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1. Why can't I get a seamless lightmap even with the most simple geometry?

   

   

   Topic by TorQue[MoD] · Apr 2018 · Home› Unreal Engine

   This is something that has driven me INSANE over the past few years working with Unreal Engine. No matter what I do, no matter what tutorial I follow, I cannot get a seamless lightmap. In this tutorial for example https://www.youtube.com/watch?v=joKnmShAdJE, the author doesn't worry about grid settings or snapping mesh…

2. Re: Why can't I get a seamless lightmap even with the most simple geometry?

   

   Reply by TorQue[MoD] · May 2018 · Home› Unreal Engine

   Oh man! Every bit of info about lightmaps conflicts with each other. I was told previously to go with non-contiguous islands. That each surface that was going to have a potentially different lighting scenario on it - For example two right angle sides of a cube - should be separate in your lightmap otherwise you risk…

3. Re: Why can't I get a seamless lightmap even with the most simple geometry?

   

   

   Reply by PixelMasher · May 2018 · Home› Unreal Engine

   keep in mind with unreals auto generate lightmap uvs, its not actually doing an unwrap, its taking the UVs from channel 1 and repacking them at a consistent texel density. so if you have stitched/overlapping stuff going on in channel 1 it will carry over to your lightmap and you will get that overlap error. you can do a…

4. Re: Why can't I get a seamless lightmap even with the most simple geometry?

   

   Reply by musashidan · May 2018 · Home› Unreal Engine

   @TorQue[MoD] I'm pretty sure that what he means by 'unpacking' is actually unwrapping. Maybe a case of lost in translation from French to English? Because you only generate lightmaps in UE. That is, unwrap/pack in one hit. That's my understanding anyway. Lightmapping in UE just seems completely non-sensical and random to…