Screen space reflection reflecting sky + banding (3.x)

[puchik]

Godot version:
3.2.2 beta 8cf450c
OS/device including version:
Windows 10 1909
Issue description:
The SSR in 3.2 currently reflects the sky which can result in banding on some angles and unnatural stretching of the sky material when starting to look down.

Banding in the reflection

A lot more noticeable when adding even slight roughness

Jarring transition from screen space to environment reflection

Steps to reproduce:

1. Make a new project. Add a shiny flat surface (floor or wall).
   1.2. Optionally add an environment that makes the effect more obvious.
2. Observe how at lower angles there's banding + if you have a sky texture set there is a jarring transition when switching from screen space to environment reflection (especially if radiance size for sky is low).

Minimal reproduction project:
ssr-sky-artifacts.zip

[Zireael07]

A-ha, judging by the pics this should close my ancient issue with artifacts in SSR (will try to link later)

Nicely explains why I couldn't find rhyme nor reason for those, with the amount of geometry in my levels the sky would've been literally the LAST thing I would've suspected!

[puchik]

This one #18395 ?

[Zireael07]

Yep. Forgot I already closed it thinking it a dupe of another issue.

[puchik]

Yeah there was an issue about general SSR artifacting and broken roughness but it all seems to fit under the far clip and pre-blurred mip map issues... this should hopefully at least take care of the far clip/banding one.

[akien-mga]

Fixed by #38954.