OTOY Forums

Hi fellows

i'm currently working on a winter scene.
Since the render takes quiet some time, i tried to set the max samples as low as possible. In this case a had 3000 with DL Kernel and Diffuse. For the light inside the cabin i set the sampling rate to 10 to let the renderer focus more on the emitting light. Hopefully this is not a faulty reasoning. But even with 3000 samples i don't get rid of those little spots near the window. Are there any suggestions how to improve the illuminated areas of a render without pushing the max samples to far? Should i take higher values for the lights sampling rate? My initial thoughts was an animation with flickering light from inside the log cabin and falling snow in post, but even with 3 x GTX780 that remains impossible.

Thanks for some thoughts about this ...

Try taking using the 'hot pixel removal'.

Yes, the "hot pixel removal" tool in the imager node could be useful to remove this noise.

-Juanjo

Thanks for your response. I'm testing it at the moment.

What is the influence given by the sampling rate value of the light then?

Edit: Hot pixel visibility set to 0 did the trick. Thanks for the hint!

I would set Hot pixel visibility only to about 30%. The lower the number, the more you lose details in the picture.

If you have hot pixels, render in double resolution and lower the resolution when finished to 50%. It should help also.

Whenever hot pixels are sporadic (less than a hundred or so) and the image is otherwise very clean, I often just retouch them out (clone tool and spot healing in PS) rather than do ridiculously long renders. My math tells me that 5 minutes cleaning by hand is smarter than the beast cooking for many hours.

And region render can work some magic too. There does not appear to be a limit on how small you can draw those regions in F9 RRs. That really has helped - you can draw a tiny box here, watch HPs disappear, draw a tiny box there...

Thanks for your advices. I'll check them out.