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Some strange shadows appears on custom geometry

Hello,

When i import my meshes to a ue4 scene and rebuild lights, some strange shadows appears.
I have tried to calibrate lightmap resolution, uvw map to fix this but couldn’t.
How can i fix this problem?

dirt.jpg

It has overlapping UV’s. Check out tutorials on the web for lightmap UV’s.

As Jacky said, the mesh has overlapping uvs -> you can fix that with a 2nd uv channel: http://www.youtube.com/watch?v=z5yc-bKbHyc

Here is also a good site for light/shadow problems: http://www.worldofleveldesign.com/categories/udk/udk-lightmaps-05-common-problems-solutions.php

Thank you very much. I will watch tuts and try this.