Fireflies

[Antonis777]

Any suggestions?

[Zom-B]

Seems like your scene contains one (or multiple) underpowered light emitters that.
Assign each of your light to a separate LightLayer to find the bad one by deactivating others
(use linear or camera tonemapping to do so!)
Beware of higher RAM usage using LightLayers...

Its also possible that a light in your scene uses a super tiny mesh, that can cause such problems too.
Try to keep emitting meshes as big as possible for best performance. Avoid emitters covered in Glass or stuff like that too...

To smooth out single Fireflies you also can raise super sampling to 3or higher if your RAM allows to
(not the best idea using multiple LightLayer at the same time because RAM usage can "explode")


Try also to search the Forum, since you aren't the first one with such problems

[Pibuz]

Hi Antonis!
I really like the subtle out-of-focus of your image!

..I've found fireflies of that kind while trying to render a scene with SUN/SKY active through an exit portal with recent (not LATEST) versions of Indigo.
What are you light env settings?

[Antonis777]

I've no emitters in this scene but the sun. My light env settings is sun and sky with turbidity 3. I suppose fireflies may be caused by the many reflective materials such as the mirror, the floor ( wiyh IOR 4.0) or the window glass but I'm not quite sure about it. I'll try different settings or maybe another type of floor and see what happens..!

[Pibuz]

..well, I can't see the sun.. Do you?

Double-check your window glasses' normals, or try hiding them just to make sure

[Headroom]

I bet you used path tracing in conjunction with an exit portal. That's the reason we can't see a sun patch and only the sky color reflecting on the floor. IIRC there is currently a limitation on using these together.

For scenes like this Bidirectional Pathtracing is usually the better choice. That will go a long way in reducing these fire flies. Unless you want to see a reflection in the window glass you can delete it to speed up rendering. If you keep it in the scene then definitely use glass acceleration.

[Antonis777]

Pibuz wrote

..well, I can't see the sun.. Do you?

Double-check your window glasses' normals, or try hiding them just to make sure

Headroom wrote

I bet you used path tracing in conjunction with an exit portal. That's the reason we can't see a sun patch and only the sky color reflecting on the floor. IIRC there is currently a limitation on using these together.

For scenes like this Bidirectional Pathtracing is usually the better choice. That will go a long way in reducing these fire flies. Unless you want to see a reflection in the window glass you can delete it to speed up rendering. If you keep it in the scene then definitely use glass acceleration.

Thanks Pibuz and Headroom for your advices...! You were both right. Window glasses normals were not facing right and I also used Bidirectional Pathtracing with MLT to eventually see the sun. Hope you like the very first result, I'll try to make it better!

[Headroom]

Yup. Very nice first result!

[Pibuz]

Very nice VERY first result