Strange Artifact With Final Gather

This is a low lit scene (A office at night)

Without final gather


With final gather


There is 4 squares of shadow, might be a bit hard to see.
The same artifact is seen on all places this asset is used.

UV settings provided by artist


More examples:

Same place again but in actual scene (above is from isolated repro scenee). A little more artifact going on lower left sid


Really showing here

 

hard to tell here so dark, but I think there is none

 

Thanks, will have a look tonight

 

Hi @kristijonas_unity

Chaning the irradance only moved the artifact around on the surface

 

@kristijonas_unity We have found the issue. This asset is built on two materils ontop of each eachother.

One transparent glass material and one normal



Its the combo of these two that creates the problem. If I remove the glass it works

edit: Though I do not know the best way of solving it. One way is to seperate the glass mesh and turnoff cast shadow (but havent tried it yet)

 

Either remove the glass from being lightmap static, or make sure the material uses double sided global illumination.

 

Forgot to answer here, I decoupled the meshes in the model and turned of shadows for the glass renderer