[Bf-cycles] Base 'Render' samples (simple request)

[storm]

В Пт., 11/11/2011 в 14:18 -0500, Jordan Miller пишет:
> couldn't the compositer or the cycles engine measure the noise
> reduction with each successive pass and thereby achieve a user defined
> noise threshold? it would allow standardization of all renderings
> (rendered to a noise level of ## dB across >90% of the image)...

Unfortunately it impossible. You only can guess variance decay using
1/(sqrt(N)) with N = number of passes. Any statistically based
measurements far from what we see by eyes. Maybe complex psy-based
algorithm exist, but i doubt it can utilise fact that only portion of
moving picture take more attention then other. Random generators not
perfect, there always be some parts of image that too noisy and stay
noisy in next frame, so you get false positive.

> 
> as people start to use cycles for animations choosing a pass value
> high enough for complex frames may oversample simpler frames and
> unnecessarily increase render time. having the end user figure out
> which individual frame will have the most noise is also non-trivial.
> 
> being able to simply set a "noise level" IMHO would be cleaner
> interface and technically more accurate for what the end user is
> trying to achieve, while also being scalable to animations and any
> desired rendering or compositing complexity.
> 
> thoughts?
> 
> jordan
> 
> 
> 
> On Nov 11, 2011, at 2:04 PM, Brecht Van Lommel
> <brechtvanlommel at pandora.be> wrote:
> 
> > I don't think this is needed, there is no right value anyway, it
> > depends on the scene. I'd rather have a low value that can be
> > increased later. There's currently no way to render something without
> > understanding that this value needs to be tweaked anyway.
> >
> > Brecht.
> >
> > On Thu, Nov 10, 2011 at 6:59 PM, David Black <db4tech at yahoo.co.uk> wrote:
> >> Hi Brecht,
> >> How do you feel about changing the base 'Render' samples from 10 to 1000 (or
> >> 500 at the very least)?
> >> Thought it might save complaints and help new users, who don't understand
> >> why their new Cycles renders are noisy.
> >> Thank you kindly for all your hard work, very much appreciated,
> >> my degree work would not have been possible (using Blender) without it!
> >> David
> >>
> >> _______________________________________________
> >> Bf-cycles mailing list
> >> Bf-cycles at blender.org
> >> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>
> >>
> > _______________________________________________
> > Bf-cycles mailing list
> > Bf-cycles at blender.org
> > http://lists.blender.org/mailman/listinfo/bf-cycles
> _______________________________________________
> Bf-cycles mailing list
> Bf-cycles at blender.org
> http://lists.blender.org/mailman/listinfo/bf-cycles