[Bug?] Fireflies show up when "Denoiser: only final pass" is enabled

[onyxlee]

Hi guys, maybe this is a bug?

I usually turn on "Denoiser: only final pass" to save render time. But when my camera is moving far away from the objects to show the whole scene, the first few frames were rendered fine, without any fireflies, but the last few frames, where the camera is at the exactly the same spot, a lot of fireflies suddenly appear. I tried to hide/unhide/re-render this part and still got lots of fireflies. Only when the option "only final pass" is disabled, it will generate clean images again.

Did I do something wrong or is that a known bug?

Thanks.

[npg]

Are you using Lens Effects? Could it be the same as this (though the previous report doesn't seem related to camera movement)? https://forums.chaos.com/forum/chaos...-update-timing

[onyxlee]

Thanks, I didn't use lens effects, but his issue seems exactly like mine. Will use denoise every pass for now and wait to test in your 2.81. Thanks a ton!