Issue:
If I apply a translucent material, using Lightingmode: [Surface ForwardShading], strange rectangular “holes” appear on the surface of my glass mesh. The “holes” position, count and size, depend on the camera direction. (From some angles and distances, they disappear or flicker.)
Unlit:
The “holes” are not present at the Unlit pass.
The “holes” also disappear, if I hide the overlapping window frame mesh. (It’s a nanite mesh, but the same issue persists, if I use a regular static mesh instead.)
If I change the translucency LightingMode to [Surface TranslucencyVolume] the rendering errors disappear, but so do the specular refelctions…
Rendering overview:
As far as I can tell, the errors are applied at the lighting stage.
Well, if somebody has any idea if this is a known bug, or if I’m doing something wrong, please let me know.
Just as a sanity check, I tried the same setup using a default plane and sphere mesh:
→ Same problem. So I doublt it has anything to do with my 3d meshes.