Light Building Texture issue

mats effect

Hey all

Having a bit of an issue with one of my assets after I build the lighting in unreal.

The first screenshot shows the asset in unlit mode and the texture on the wall looks as it should



However once I build the lights I get this odd error



It actually looks like its partly loading an older version of the texture but, I have tried to delete the mesh and textures etc and reload them with no luck.

The asset beside it is using the same material it's just minus the open panel and it bakes fine.

Any ideas

thanks very much

Ramseus

When you finish building lights and get the results window, does it show any UV errors for the mesh or anything?

mats effect

Hey

Yeah got a total of 9 overlapping uv errors. Sounds obvious but I don't get what it means if you know what I mean.

cheers

Ramseus

That should be relatively easy to fix up then. The light build results window just tells you which meshes have UV errors and what type of error.

If you aren't creating a seperate uv unwrap on a second channel (UV1) for lightmaps then you need to do that (exactly how depends on the program you use). Simply, any UV charts/islands that are either over top of another one (overlapping) or tiling outside of the 0-1 uv space will cause lightmap errors. All UVs need unique space or else they will have shadows that belong in other places.

There's a whole page on the udn about lightmap unwrapping, might be worth a look
http://udn.epicgames.com/Three/LightMapUnwrapping.html

mats effect

Yep that was it, ah feel so silly. Just needed to move a few things around in my light map's.

Thank man