Fireflys at glass material with PMC

[ultraecke]

Hey there,

no matter what I try with the kernel settings I always get the same firefly problem in the image:

Kernel:

Glass material:

Blender Octane ver 2.71.5 with Octane 1.55
Win 7 64 | 16 GB | GTX 680 | AMD x6

How can I solve those fireflys?

best regards
Ecke

[ultraecke]

Edit: the more samples, the more fireflys I get

No one can help?

[grimm]

Have you tried to increase the size of your light(s)? This can help with the fireflies. Also lowering the reflection a bit might help?

[FrankPooleFloating]

Have you tried doing some Render Region up there?

Also, if it were me, and I could get the fireflies down just a little more, I would absolutely retouch those out before rendering for many, many hours... I do this all the time, when there are just handfuls of FFs here and there. Takes mere minutes - especially when you have very extensive retouching experience - which I do. Switching between clone tool and spot healing brush makes for very quick work of killing flies. Splat.

[prodviz]

Have you tried reducing the Hot Pixel removal to 0.5 or a bit lower?

[profbetis]

This scene doesn't look like it would benefit from PMC kernel. I think you could get around this by trying out DL kernel.

[ultraecke]

Thanks everyone for the answers. I followed your advices and switched the kernel, lowered pixel removal and tried some more things and this is the result now.

Much better but you can still see some fireflys... I cant get rid of those.
Here my new settings:

@grimm: the sun size actually increases the fireflys in this case. now my sun size is at .25 now.

Why is it just in the out-of-focus areas? I try to understand what octane does there, but all the things a tried, that should change something didnt work.

regards

[FrankPooleFloating]

Okay, so the way you have it now is precisely where I would just bang out FFs in PS. I am not joking bro - if you zoom way in, start at top left, get a 1 or 3 pixel spot healing brush and just start working your way back and forth and down, you could have this spotless in under ten minutes. For me, it is just not worth the wait for any more rendering. I am in business to make money - not spend countless hours trying to remove mysterious FFs by tweaking settings and ending up with a different look than what I was after in the first place. I do not even ponder it - I just do it as an automatic function inside my workflow. Smart shit like this allows a bloke like me to eat steak at will and golf whenever the hell I want. But I imagine that someday they will have the FFs killed... gotta.. right? Till then, I do what works for me. That does not mean it works for all. Just sharing my experience and er.. knowledge.

[profbetis]

It's possible he's doing an animation, where manual editing isn't viable.

ultraecke, if this is true, I recommend using a Median Filter and masking it to the areas you need it in, and then animating that mask with your animation. Because you're working with the out of focus areas, you should hardly be able to tell. A radius of 1 or 2 should be sufficient. Let me know how it goes.

[FrankPooleFloating]

Well, that is certainly true. Animation scenario is problematic if the case. Rotoscoping FFs would suck hard.