I stumbled across this behaviour in 4.22. Found a model, gave it a standard material, HDRI sky, raytracing reflections enabled, outside looked ok, but for some reason, the inside was enlightened aswell. But there were no windows in this model, it was “watertight”, there should be darkness only
The Venator is pretty massive, material is two sided, not transparent, (roughness about 0.8, not metallic), yet the inside reflects the outside HDRI sky to some extend.
Video:
And as soon, as i switch to screen space reflection, it´s as pitch black, as you would assume.
Did a test with that, and, it changes something, those intense light beams vanish, that appear at 2:55 min in the former video, but the overall illumination stays
Here a test with 2 Cubes to show the results (for some reason, with such a modified Venator, the fps goes downhill). Both groups are one big cube, that contains a smaller cube inside it. The polygons/faces from the smaller cube point inwards, those from the big cube outwards. Thats how the Venator an probably many other objects are built.
The group on the right got your dublicated and flipped polygons for both cubes.
