Hi, I rendered the same scene with Corona 9 and Corona 10 and saw a massive difference in the render in term of lighting. The scene is lit by an HDRI and there’s a real difference in the rendering of the shadows: they are sharp in Corona 9, and blurred in Corona 10. So basically all the lighting r…

I am interested which one is closer to ground truth? Since in above post it is being mentioned that at 20K, difference isn’t observed (and how come if they are both downsampled apparently to just 1K behind the scenes?), what happens at that 20K? Does it look like in V9 or like in V10? What is corre…

Resolution or filter type shouldn’t change image color don’t it :confused:

Hi guys, First thing to mention is I tried the string trick and I confirm Corona 10 now gives similar results to Corona 9, that’s a good point as we now have a workaround, although not really user friendly. To clarify and summarize: when using a 7k HDRi map without using the ‘string trick,’ I foun…

Here is the conversation I had with Aram replying to my support ticket, in case it helps: Aram Avetisyan (Chaos) I understand what you are addressing, but keep in mind that the filtering has been improved for environment maps, so consider the results with Corona 10 as “superior” now, even though …

So the better filtering makes the image look inferior but we have to think of it as superior. Got it

Internally downsampling to 1K might be little too much, since I create HDRis, I know how tiny the Sun is even at 25k + res. Will do my own tests to check as well now.

Juraj: Will do my own tests to check as well now. Awesome. Thanks Juraj.

Some rough (and probably wrong) math: sun disc diameter is 0.5° in visible sky, which translates to 1 pixel in a HDR @ 720px width (well, it’s rectangular, not circular so obviously not enough resolution to properly represent a sun disc) when a low res HDR gets downsized to 1000px internally, we e…

[image] dj_buckley: So the better filtering makes the image look inferior but we have to think of it as superior. Got it The new filtering technically gives closer look to the original HDRI used, the image looking inferior or superior is subjective here. This smaller version is used for sam…

It’s not subjective though. The user has spent time fine tuning his scene and getting the image to look as it did in V9, now he’s rendered it in V10 and it looks completely different. So now it no longer looks like how the user wanted it to look, which means it’s inferior to his original setup. T…

Environment lighting discrepancy between Corona 9 and 10

Corona Corona for 3ds Max Corona for 3ds Max :: Issues

tom_grimes July 25, 2023, 12:06pm 38

Hotfix 1 is out which addresses this issue. https://forum.corona-renderer.com/ Corona 10 (Hotfix 1) released for Cinema 4D and 3ds Max or straight to Download | My Chaos.

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Environment lighting discrepancy between Corona 9 and 10

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