OTOY Forums

Hi,

I still cannot get rid of the heavy grain caused by "one" light in foreground.
Insn't there a trick/workaround or alternative for that particular (but needed) light?

Do I really have to raise the overall samples in render settings?
This nearly tripples up my rendertimes only for that object/light.

(Image shows a small aerea of the full HD screen) thanks for help

Mike

Hi Mike,

I'm not exactly sure how your scene is setup but there is a sample rate parameter for each emitter in octane.
Tweaking these will give different priorities to different lights during sampling.

Hopefully you can tweak these for your light sources to get an even noise clean-up rate on your image.

If this setting does not help (experiment on a test scene until you understand what settings should work for you) then your problem might be something else in the scene.

Thanks
Chris.

Hi Chris,

thanks for your reply!

I have the samples for that light (in light emission settings) already set to
400, 800 and also to 1.200 but grain remains!
When I turn that light completely off, the noise is gone.
So its definitely this special light.

Any idear whatelse I could try?

thanks
Mike

I think i would need to see the scene to find out exactly what is going on.
How many other lights are in the scene?
It would be interesting to try an extreme test: set the sample rate for all other lights to the lowest amount and this single light to full.

Also try isolating this light and the object you say is causing the problem in the screen shot (set them up in a separate scene with nothing else in it).
This would confirm/deny if it is the sampling or if it is something else.

What kernel are you using and does this problem object have any scattering or absorption?
Also does the light source have a specular material between it and the problem object?

Thanks
Chris.

"Also does the light source have a specular material between it and the problem object?"

Hmmm, there is a shiny metal robot just above/between it.
Maybe thats the malefactor!

Thanks again!
will try that first tomorrow

regards
Mike