Lightmap Errors on Interior

Development Rendering
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1

Hi,

I’m having trouble with lightmaps on an interior scene.

The external meshes all render fine, but once I add the interior bits the meshes just look horrendous.

It could be a setting I’ve turned on by accident, as starting a completely new project and they light fine.

Any ideas? The seem to sort of work if I set them to Stationary, but that’

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s not a thing I want to do.

Thanks for any pointers.

2

Good day. Make sure that you look though this troubleshooting guide.

It looks like a problem with lightmapping UVs to me.

3

Hi,

I have redone the UV’s a number of times, but still the same problem.

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4

You need to set the lightmass index, which specifies which UV channel to use. In UE4 it starts from 0 for the first channel, while in 3ds max it starts from 1. You can also increase the lightmass resolution from 64 to 256. UE4 can generate UVs automaticly for you, you can enable/disable that feature

5

Gah! Turns out I needed to set the Lightmap Coordinate Index as well as the Destination Lightmax Index for some reason…