I also have similar problems with the lightmap of the object. I edited the faulty objects in 3Ds Max manually (Unwrap Flatern with chanel 2). I tried importing into UE 4 failed objects after editing with 3 versions:
- Object at first error (only imported with DataSmith).
- Give the object Unwrap Flatern in 3Ds max with chanel 2. then import it using Data Smith.
- Same as object 2 but basic import of UE4.
Result:
1 and 2: + Source Lightmap Index: 1
+ Destination Lightmap Index and Coordinate index: 2 (Uv map created by tick Generate Lightmaps UVs)
+ UV chanel 0: Uv map is like unwrap chanel 2 from 3DsMax
3: + Only unique UV chanel 0. Also with Log “has degenerated tangent bases which will result in incorrect shading …”. fix this error by adding a unwrap chanel 1 channel to the object in max, I also don’t understand the reason for this error !?
after fixed:
- Source Lightmap Index: 0
- Destination Lightmap Index and Coordinate index: 1
- Uv chanel 0 opposite to chanel 1
Conclude:
1 and 2: + Source Lightmap Index (SLI): I tried on 2 objects, Source index is always the channel with overlapping UV.
Why DataSmith changed from channel 0 to channel 1 and its effect …!? If I change SLI to chanel 0, will there be any changes? I can build to see the results and I want to understand why. Looking forward to receiving sharing, thanks