Hey there!
So I was setting up a scene with simple lighting and I wanted to try out the Progressive Lightmapper.
Unfortunately the UV Seams on the spheres become very noticeable when I switch to Progressive. However baking the scene with Enlighten makes the seams unnoticeable.
You can see the difference on the screenshots.
Using the Baked Lightmap mode clearly shows the seems in both modes.
Anyone know of a workaround for this?
These are my settings though I’ve tried changing all of them:
Using 2017.3 btw!
Thanks!
So I’ve already tried creating my own UV’s for the spheres. Of course it’s impossible to not have stretching / seams on a sphere but I tried a bunch of different sphere unwrapping techniques and all of them produced very noticeable seams using the lightmapper.
UV Example:
Seams Example:
This is with Stitch Seams enabled.
My question is: Why is this only happening with the Progressive Lightmapper?
Are you using realtime GI or baked GI with enlighten?
Everything is baked - Realtime GI is disabled. I’m using the exact same settings for both modes.
That’s a bit weird.
If you turn off filtering for progressive lightmapper (I see you have on auto now), does it help things?
So this definitely resulted in less noticeable seams.
For my sphere with custom UVs it got rid of the seam along the side.
And for the Standard Unity Sphere it actually completely removed it.
But I need to use filtering. Without it there is simply too much noise in the scene.
What to do? 
Just use less filtering Auto is too aggressive, try switching to advanced and find a balance.
Whoops: Spoke too soon! Even with no filtering I get this for the standard sphere: 
That looks like bleeding from other parts of the lightmap. Make sure you have enough padding between the UVs (change the lightmapping padding from 2 to 4 or even higher as a test to see if it fixes things)
And finally it works! Thanks a lot man!
I’ve played around with the filtering (bumped down the indirect radius) and increased the number of samples.
Seam stitching helped a lot as well!
Yay! The only mystery is why enlighten’s result was seam-free from the start, theoretically it should produce seams as well (unless something changed somewhat recently that I’m unaware off).
