Why my mesh turn to black after building

Development Rendering
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1

After rendering my mesh turn to black, I’m not really understand how the UVmap work in UE4 but after I add the unwrappUVW above UVW Map in 3Dsmax (The5th pic ), it truly lower the overlapping percent. However I still have 15% and lots of mesh overlapping(The 1st Pic). I dont know how to fix the problem directly.

I also show the UV channel_0 (3rd pic) n channel_1(4th pic) in UE4

Please help me to fix the problem, I will extremely appreciate that.

2

Normally meshes that turn black are due to to low of light map resolution and incorrect light map coordinate index. Try changing the light map coordinate index to 1 (or whatever is appropriate) might help.

In the mesh editor, under general setting, click the advanced dropdown arrow, there you will find light map coordinate index.