lighting artifacts on large objects with no shadow casters.

Unity Engine
1

Hi,
we have some issues with large objects and lighting artifacts in our lightmaps. Looking at the lightmaps there are holes in the areas where the artifacts appear. Lowering the resolution of the lightmaps hides the issue.

What can we do to fix this?

Thanks

3169821--241418--upload_2017-8-2_17-56-42.png
3169821--241418--upload_2017-8-2_17-56-42.png915×551 95 KB

3169821--241417--upload_2017-8-2_17-56-14.png
3169821--241417--upload_2017-8-2_17-56-14.png915×551 91.9 KB

2

Turns out its an issue with the defaults and progressive lightmaper making holes in the map. Set the backface tolerance value below .4 to fix.