UDK lighting problem

Moshbeast

hi there guys im working with a group of classmates on a university project and we got some issues with our udk lighting i was hoping you guys could give us some help on fixing it

what we wanted to do here is we used lightmassimportancevolume and put a light inside the building to make the light shine out

SirCalalot

I'm not sure I understand what the question is, but I'm guessing it has something to do with the light-bleeding artefacts?

In the StaticMesh properties (double-click a mesh or select it and press 'F4') there should be an option to set "Cast Shadows as two-sided" as true. Either that or it is a property in the Material Editor, I can't remember.

If that doesn't help, is your building mesh air-tight?

Moshbeast

i assume you mean wether or not its actually one piece and built out of one piece which it isnt...its not mine though its a teammembers anyway ill try the solutions thx for the help

Moshbeast

just to clearify the question though the lighting affects are really strange specially on the pillars and the window and i dont know how to fix it :P

Froyok

Do you have a lightmap on every static mesh ?
It looks like your lighting is based on the vertex of your meshes.

http://udn.epicgames.com/Three/LightMapUnwrapping.html

SirCalalot

A simple enough and quick fix for the above would be to double click on your meshes in the Content Browser. Then click 'View > Generate Unique UVs > Apply'.
The settings should be OK as is for the purpose of this mesh.

Then in the right-hand pane, change the 'Lightmap Channel' to '1'.
This creates a unique mapping channel that you can use for lighting, although it's by no means perfect.

Edit: And yup, air-tight means a single mesh with no holes or gaps

Moshbeast

the model had lightmaps we used the lightmaps that udk generated

- edit
we ended up not going for a light inside the building that would shine out of the windows instead went for emissive textures

http://moshbeast225.deviantart.com/#/d4hxxfy thats the entire scene if anyone is interested and thx for all the help guys

SirCalalot

I think that looks pretty good

In future, you could always have a look at Interior Mapping. Although the material network can get a bit mental.

That and it's probably just better to model the interior

Moshbeast

lol the maps going a bit mental is a tiny bit of an understatement :P the longest chains ive had to make was...2 :P thx for the advice