Interior render fireflies issues

[Armand Rudy]

Hi folks I need some help getting rid of white spot or fireflies in this interior render.
I am using Corona 7 with C4d S24.

The scene is lit by several ies lights + a sun and sky .

I also use light materials for the bulbs, but they emit light at a power of 2. I disabled all the lights visible in reflections, still nothing.
I first rendered the scene and it took 8 hours and the fireflies were still there so I closed C4D without saving the first image because I was pissed.
I had to re-render this one to show you the scene.

What do you think might be causing this?
I am not a programmer but I was wondering, do perfect render engines exist? I mean a render engine where you put your light and your materials and everything just render perfectly without you having to tweak the settings and go online everytime looking for help?

[romullus]

My guess is that the lighting fixtures are blocking most of the light and you increased light source intensity to enormous extent to battle this and that leads to extreme overbright pixels that are nearly impossible to get rid of. Try to temporarily hide lighting fixtures, normalize all light sources and see if the problem with fireflies goes away.

[Armand Rudy]

Thank you

I will try it and let you know...

[Armand Rudy]

My guess is that the lighting fixtures are blocking most of the light and you increased light source intensity to enormous extent to battle this and that leads to extreme overbright pixels that are nearly impossible to get rid of. Try to temporarily hide lighting fixtures, normalize all light sources and see if the problem with fireflies goes away.

This is the experiment I made, I disabled all the lights, then turned them on one by one.
- First picture only ies lights + sun (hdri sky + light material disabled) no sign of fireflies on the picture
 - Second picture ies lights + light material + sun (hdri sky disabled) no sign of fireflies
- Third image hdri sky + sun only (ies + light material disabled) I can see some white spots
-Fourth picture hdri sky intensity raised to 25 + sun at normal intensity (ies + light material disabled) I can see some fireflies

It looks like the hdri sky is the culprit.

Any solution?

[romullus]

Try to hide the curtains and windows glass and render with the setup that gave you fireflies, see if that helps. Also you can try to swap HDRI to some other image, maybe you did choose some faulty one? Try to narrow the issue to single element and work to the solution from there.

[Armand Rudy]

Thank you, I will try that, I was only using the default sky and sun, but I will do as you described