Interior Time of day

Following this.

jtubb , thanks for the report! Is there actually a chance you could briefly forward me the project? That would be helpful for troubleshooting purposes - I'll also pass this to our developers for review. Thanks!

This looks a LOT like the light bleed issue I have in another post. I used this model as a reference example.

jtubb , Tim , this is indeed basically the same case - we're looking into it. I'll get back to you with either a solution, or at least a technical explanation as soon as possible.

jtubb , no need to share the project, I was able to briefly create one my own, now that I knew that there was nothing "special" going on in the first scene you posted. Thanks a lot though anyway!

So I had a look at this. So this is mostly intentional and half a bug.

So what is happening here is we add a tiny amount of ambient light from the sky. This is to simulate the light that would get into the building even though many bounces. Since this is a closed environment this is kind of wrong, if you don't want it, you should simply use night time to remove that effect.

The next thing that is happening, especially with no light sources, is that the auto exposure is working REALLY HARD at compensating for the dark scene. If you turn off auto exposure you will get a near black image.

The third thing that is happening, there is a minor bug that "accumulates" light in corners and it appears you have found the perfect geometry that shows this effect. This effect is normally not visible, but because the auto exposure it is exaggerated to 11.

To get a more realistic scene in your case, use night time and manually adjust the exposure and you should get adequate results.

If you want to do an studio scene, I have some reasonably good experience with using HDRI "sky boxes" with indoor scenes. Here you have an example for a small scale photo studio style setup: Studio environmet/setup

For something larger scale, you could use this kind of skybox: https://www.cgtrader.com/3d-mo…a9-4cdf-9cc2-869bb6250eac