I recently got this error when working on a mesh, I’ve checked my UV unwrap both in 3ds max and in the engine for anything out of the 0-1 bounds but everything looks fine, I suspect it may be a mesh problem since other things I have unwrapped do not cause this error, although I have no idea what the cause, I’ve already looked over it for any obvious problems.
The problem occurred not long after making modifications to the front of the house, (the area with the overhang) if anyone can take a look that would be great.
I am not sure what problem you are referring to, but just an advice - pack your lightmap UVs tighter. You are wasting a lot of space there. What you can to is:
Select your house and apply Unwrap modifier
switch to channel 2, and answer “move” when asked
Go to face subobject and Ctrl+A to select all
Go to Mapping > Flatten. Use value of around 0.02-0.1 for padding, click ok.
Now your uvs should be neatly packed within 0-1 area with some padding
Collapse back to Editable mesh and reexport your object
Thank you for your report. I am investigating FBX issues, but I was unable to find a problem with the provided files. At what point do you get the message? Could you please provide a screenshot of the error occurring?
Are you sure you have the right UV channel set for lightmaps?(you can check it in static mesh editor > Details panel > Static Mesh Settings > Lightmap Coordinate Index)
I was experiencing the same problem and I even didn’t think about the lightmap index because in UDK it was always channel 1 by default. Why does U4 apply channel 0 from time to time? Is it just a bug or it depends on something when export? Thanks.