UDK lightmap problem

sipher3325

Ok so i'm working on this project in udk constructing building using various different meshes. I'm having a problem with some of them where they go completely black in some areas but are fine in others. They are planes but I gave them a second map channel and I also up'd the resolution from 32 to 64 but i'm still getting this problem. Does it have to do with it overlapping? I pointed to the problem and pointed to the same mesh doing just fine in another area. Any help is appreciated.

Selaznog

Maybe it's something to do with what way your normals are facing?

sipher3325

well its a plane so I dont think thats a problem

SniperStealth

Did you set the correct UV set for the lightmap (Light Map Coordinate Index)? It's hard to see everything that's going on, a screenshot in lighting only mode (Alt+6) might help.

sipher3325

It's strange because in lighting only it shows nothing. Its on the correct channel, channel 2 in 3ds max which is 1 in UDK.

sipher3325

ok I believe it's fixed. When I rotated it around it fixed to problem. The material was set up for 2 sided soooo...not really sure what happened.

sipher3325

Ok so for some reason I can't get udk to display the materials anymore. After i went light only mode I cant go back. I've tried all the other modes but nothing is working.

SirCalalot

Are you running in DX11 mode? As sometimes it can be a bit buggy, meaning you'll need to swap back and forth between DX9 and DX11 to fix it.

sipher3325

Nope didn't work. Still stuck in that mode.

SirCalalot

Heh

The only advice I can give is to make a copy of your Content folder with your work in, uninstall UDK and then reinstall to the latest version.
Sorry for being completely unhelpful.

Blubberblase

on the lighting only picture it looks like the face is inverted. I had a similar problem where the whole mesh went dark as soon as it got a little shadow cast on it. Problem was that i had two sided materials checked and couldn't see that the whole mesh was inverted :P maybe it's the same for you

Cordell Felix

are the lightmap uvs touching the border at all?

sipher3325

Thanks for the input. I think the problem with the shadows is fixed. As for being stuck in lighting only mode i'm just going to reinstall. I tried it at school and everything was fine there so that seems to be the issue. Thanks again for the help.