When I edit any material, Corona also edits the overall appearance of the image.

Hi everyone, I hope you’re all doing well!

I’m having a problem with a scene and it’s starting to drive me a little crazy.

When I edit the material of an object, in the interactive renderer, the scene seems to darken or change gamma generally, not just in the object I’m editing.

I always work with Corona Sky + one or more suns without any problems; I’ve been doing it this way for years. So I thought that this time I did something different and it might be affecting the calculations, but no, I deleted the suns, left only the sky, I even tried switching to Arnold and then back to Corona and lighting with a white color without the sky, and the problem persists. I tried lighting with HDRI, with a Corona Color, with the sky, with a gradient map, the problem just remains.

I’m using Corona 11, and I tried installing versions 9, 10, 12, 13, and 14, and nothing fixes the problem.

I thought my modeling was done incorrectly, so I deleted everything and went from having 60 walls to having 4 walls and a roof to see if the problem would go away, but it persists.

I disabled the general displacement of the scene, and the problem remains.

I checked the Xrefs, and there’s nothing hidden or unusual that could be causing this.

Basically, I tried everything I could think of, and everything chatgpt suggested, jaja.

Once I leave the interactive running, I edit and move things and nothing changes, but when I pause it and start the interactive again, it gets damaged again.

I’ve attached images where the problem is evident, especially in the area behind the sofa.

When I render a final image, it appears dark, so I don’t know if I’m working with an IR that’s giving me an incorrect result.

Has anyone else experienced something similar?, please help! :frowning:




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Hi,

This sounds like auto exposure, check if you have it enabled. Open the VFB, navigate to post tab and look at the very top rollout. If you see checkbox enabled there, disable it and see if that solves your issue.

Hi!

Thanks for your idea, but I think auto-exposure appeared in Corona 12, or if it’s in version 11, i don’t see it anywhere :frowning:

Any Tonemap Control applied anywhere? Corona Tonemap Control Map

This can require a restart in rendering to take effect again, so sounds somewhat similar to what you describe. You can also always send in a ticket with an example scene attached via https://support.chaos.com/hc/en-us/requests/new

Hi Tom!!

Thanks for replying. No tonemap control. I opened other scenes from other projects and now it’s happening in all scenes. I’ll submit a ticket.

What are you using for the secondary GI solver? (Performance tab) I think it might be due to the UHD Cache recalculation. If the issue doesn’t appear if you switch to Path tracing + Path tracing, then the culprit would be most likely the UHD Cache (or 4K Cache if you are using it).

Another idea is the “exposure change” caused by MSI - https://support.chaos.com/hc/en-us/articles/4528530828689-Exposure-changes-when-I-start-rendering