With a PBR lighting setup (
EnvironmentDiffuseScale both set to 1, and
OutdoorAmbient both set to 0) and an
Atmosphere object present in
Lighting, any geometry that has a shadow cast upon it by other geometry will cause the normal map of its material to render incorrectly, regardless if the Atmosphere is even enabled. The issue does not occur during the daytime.
This is clearly unintended behavior.
Side note: I don’t believe the full PBR lighting setup is required for this to occur, but it makes it the most noticeable.
Here is an image demonstrating the issue, and the place file the screenshots were captured in.
Repro_AtmosphereSurfaceNormals.rbxl (32.7 KB)
Other side note: Atmospheres also seem to interfere with the placement of stars in the sky.