UDK lighting problem

Moshbeast · Nov 2011

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 · Nov 2011

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 · Nov 2011

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 · Nov 2011

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 · Nov 2011

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 · Nov 2011

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 · Dec 2011

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 · Dec 2011

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 · Dec 2011

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

UDK lighting problem

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