Unmapped texels

Development Rendering
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1

I like my scenes/objects to be as clean and performant as possible
Still learning UE4 (who isn’t), still learning UV unwrapping

I have this pipe modelled in C4D, I think I have a clean UV map
When I bring the object into UE4 , the building process takes a good while.
Looking at the reasons why this is taking so long I get the results in the white box (see screenshot) …
What are all those unmapped texels ?

I have to admit - I’m getting this result after I cranked the lightmap resolution on the object upto 512 (not sure why I felt the need to do this)

When I’m putting it back to 64, I only get .2% unmapped texels.

Any help greatly appreciated.

2

The same question!

3

I also posted this on the Unreal Forum and got this as a response.
“If you haven’t changed the importer to create lightmap uv’s, it will create a new set, and make that the default lightmap layer. So your nicely laid out on may not be used.”
Read thread here

4

Probably you’ve solved this by now, but if not I’ve written about unmapped texels (and why they are so important) on my blog http://niberspace.com/blog/speed-up-ue4-lightmap-build-times/