Lightning build creates strange pattern on Static Mesh

Development Rendering
1

Hi,
I desperately try to create a 3D architectural walkthrough for presentation but i am faced with serious lightning issues.
My static mesh has been created in ArchiCAD and been exported to C4D where i define the final settings for FBX import to UE4.

The preview of my static mesh is always fine,

99548-screenshot+1.jpg
99548-screenshot+1.jpg1089×571 155 KB

but when trying to build lightning in UE4 there occur these strange patterns:

99549-screenshot+2.jpg
99549-screenshot+2.jpg1091×569 131 KB

I read that it could be an UV error and that i have to use 2 UV channels in static mesh browser.
But that didn’t help.
Any chance to solve this problem?

2

Did you ever figure this out? I’m having the same issue.