I recently got this error when working on a mesh, I’ve checked my UV unwrap both in 3ds 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.
I’ve uploaded the mesh here:
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.