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1. Modular Building - Lightmap Problems

   

   Topic by Shad0w_Walker · Nov 2014 · Home› Unreal Engine

   Hi folks! I've been trying for a while now to get the lightmaps working on my modular building set. It's really not that fancy, but for some strange reason I really can't get it to look good. I've attached some screenshots. Maybe you can figure it out why it might not look that good. The Lightmap-Resulution is @ 128. In…

2. Re: Modular Building - Lightmap Problems

   

   Reply by ZacD · Nov 2014 · Home› Unreal Engine

   126x126 or 30x30.

3. Re: Modular Building - Lightmap Problems

   

   Reply by ZacD · Nov 2014 · Home› Unreal Engine

   You actually want to snap to a 126x126 grid, UE4 takes away 1 pixel around each edge automatically, so 64x64 is 62x62, 32x32 is 30x30, etc. Also this causes an issue if you use test bakes at lower resolutions unless you use a resolution that is x4 larger. so 32x32 to 128x128 or 64x64 to 256x256.

4. Re: Modular Building - Lightmap Problems

   

   Reply by Lucas Annunziata · Nov 2014 · Home› Unreal Engine

   Weird. I've always snapped to 32, 64, etc. and not had any issues in ue4. I posted in that thread for a bit more clarification on this. I just did a couple of tests with 62/64 snap'd lightmap uv's to compare, doesn't seem to be any noticeable difference. Then again, I'm also not getting any seems at the edges with either…

5. Re: Modular Building - Lightmap Problems

   

   Reply by GhostBlades · Dec 2014 · Home› Unreal Engine

   @Shadowwalker - did you ever figure this out? Did snapping the UVs to the resolution help?

6. Re: Modular Building - Lightmap Problems

   

   Reply by Steppenwolf · Nov 2014 · Home› Unreal Engine

   You can try the following: make a 128x128 checker texture. Load it in your uv editor. Pixel snap your elements (alternative option on the grid snapp button in the bottom right corner).

7. Re: Modular Building - Lightmap Problems

   

   Reply by ZacD · Nov 2014 · Home› Unreal Engine

   This post is from Epic Staff is where I first heard about it. https://answers.unrealengine.com/questions/95423/lightmass-with-bad-shadow.html It's really annoying it's not documented anywhere.

8. Re: Modular Building - Lightmap Problems

   

   Reply by Lucas Annunziata · Nov 2014 · Home› Unreal Engine

   Is this documented anywhere? Any lightmap resource related to udk/unreal 4 has failed to mention this.

9. Re: Modular Building - Lightmap Problems

   

   Reply by Shad0w_Walker · Nov 2014 · Home› Unreal Engine

   @Steppenwolf: Thanks man. The result I got was way better. But I still have these wierd shadings on the non lit side. Any Advice? @ZacD: So should I use a 126x126 checker pattern in Max?