More fireflies in video render

[laurack]

Thank you very much, I will try what you mentioned about the sun disk, which is probably where the problem comes from :-)

I have made the render with 50 passes for each frame and it has taken about 50 hours to make 270 frames, my computer is an AMD Ryzen Threadripper 3970X and NVIDIA GeForce RTX 3090.

I will return to the default configuration and try again.

Thanks!!!

[laurack]

Hi, I'm uploading a few seconds of rendering that I've done with the changes in the size of the sun as Maru advised.

The number of fireflies has been considerably reduced :-) although in some frames the texture of the wall generates a strange noise.

The number of passes that each frame has is 60.

Thanks!

[maru]

Which denoising type are you using? Could you try with the Intel AI Denoiser if you are not using it?
I can also see some large-scale flickering on the wall, next to the car. Are you using UHD Cache in "animation (flicker-free)" mode? (Render Setup > Performance > UHD Cache rollout)

[laurack]

I had Denoise mode on "Corona high quality" and UHD Cache was on Still frame.

Thanks, I'll try what you're telling me.

[laurack]

Hi, I'm uploading the latest test with the parameters adjusted to what you've told me and I think it's perfect now ^_^

Thank you very much.

[BigAl3D]

I'd focus on the materials in that area rather than denoising, but I'm no doctor. Maybe duplicate your camera, move it close to that box, and render with that closeup just to see better.

[laurack]

Thank you. If I don't like the result with the adjustments I've made, I'll try what you're telling me.

[laurack]

Hi, here is the final result of the render.

There are still some fireflies but this is enough for me.

Regards.

[maru]

If this kind of fireflies could not be mitigated using highlight clamping, then I guess the only solution would be rendering more passes per frame.

[laurack]

Maru, if I use highlight clamping it creates a blur that, although small, eliminates the fireflies but also eliminates the glare from the sun and the light from the charger, which is one of the things we want.

I gave it 70 passes per frame and it took 76 hours to render this 9-second sequence.

Another option that occurs to me is to render at 60 frames per second instead of 30 frames per second.

But for now, the way it looks is enough for us :-)

[maru]

Another option that occurs to me is to render at 60 frames per second instead of 30 frames per second.

I am afraid that would increase render time from 76 to 152 hours and the fireflies would still be there. :)
If you wish, we can check your scene and try to come up with some optimizations, maybe this would be helpful for you in future projects. You can contact us and attach it here: https://support.chaos.com/hc/en-us/requests/new

[laurack]

Thank you :-) you are very kind but I am very crazy and chaotic when structuring scenes and instead of helping me you might start to hate me :-P