lacilaci wrote: Wed Oct 30, 2019 7:25 am
to me this looks like noise is picked up ok, but there are areas that are not noisy, but more like almost not even sampled/completely black.
I don't what setting you were using for step size and warmup but what is happening is that the metric is considering that after (
warmup+step) samples, this region is closer to convergence than the rest of the image. Up until (
warmup+step) it should have received just the same amount of samples.
After that every
step samples the current convergence will be reevaluated according to the result of these last samples.
That means that this region being undersampled is simply the result of the metric we're using. I couldn't find anything reasonably simple that looked better though.
If we somehow changed the sampler to always shoot samples if the region is super dark like this, we would probably harm other scenarios.
lacilaci wrote: Wed Oct 30, 2019 7:25 am
Now, eventually some samples end there and adaptivity picks it up
As you've noticed, after the other regions get closer to their own convergence, this region starts getting samples.
The adaptiveness is not the same in the time domain. It tries to keep the noise constant accross the image, instead of keeping the amount of samples constant.
It is interesting putting both warmup and step as 1 and seeing the adaptive jump around the image, much like metropolis does. In the tests I've done it ends up converging to the same result as using a longer step size
lacilaci wrote: Wed Oct 30, 2019 7:25 am
Overal I really like this improved adaptivity now!
Glad to hear
