video: 2017 03 21 12 26 - YouTube
system specs: win10x64, amd r9-290 gpu, crimson 17.3.1
This bug only appers in mid-close distances and only on inclined surfaces. On the prevoius version of ue 4.14 there was no such problem at all.
already tried: change zbounds, adjust lightmap res, changing AA, changin light density. Plz help 
Do you have DBuffer Decals enabled? This looks like a known issue regarding meshes with âuse as occluderâ checked.
You can try these workarounds.
- Uncheck use as occluder
- Apply a material that has a value of .1 plugged into pixel depth offset
If you donât have Dbuffer decals enabled would you mind providing a list of steps that leads to the issue starting from a template/blank project.
!
Removed âuse as occluderâ on all meshes with those glitches and its finally PERFECT again. a lot for ur help!!!