[Maxer]

Just wanted to post some results I got with the new cooperative rendering setup.

This image was rendered on a singel Dual Opteron machine for 60 minutes and it reached a sample level of 10



This image was rendered on 5 dual Opteron machines for 60 minutes and each machine reached a sample level of 10 as well. I don't know what the combined sample level is, does anyone know if this is written to a log file or if there is any way of determining what the sample level is?

[Peter_K]

Hi Maxer..

I don't think there is a log with the linking output... Can you do a test letting the 1 CPU opteron run for 5 hours... My single node always gets darker that cooperative rendering, and it looks like you will end up with the same result..

[Maxer]

I'm going to do the same test tonight letting my single machine run for 15 hours and the cooperative machines run for the same time. We should see by tomorrow morning if there is still a significant difference.

[Maxer]

I finished my small test last night and I'm not very pleased with the results. As you can see the cooperative rendered image is brighter but there seems to be some artifacts left over that the single PC image doesn’t have. To me the first image seems to have less noise and is closer to the correct light level than the second. I honestly expected there to be a bigger difference in noise reduction between the two.

Rendered for 15 hrs using single dual PC


Rendered for 15 hrs using cooperative rendering and 5 dual PC's

[ludi]

sometime I think the best result is given after 15min Rendertime....
Why?
=> ok right it´s very noisy at this stage, but you have a good preview of the Scene. And you think (and are expectant /happy) it would become better with time. In your imagination you automatically reducing noise. So you can leave your machine alone during the night, -sleeping and dreaming of your renderesult... But sadly not in each case you get what you expect.

so far my experience.

[Peter_K]

Hi Maxer,

You get the same results as Im getting.. The Cooperative image is way brighter than the single one.. And when comparing a rendering done on 10 hours on a single CPU compared to 10 CPU * 10 Hours, the noise is not so different between the two..

I still would like to see a sliced render option for linking images, like the -hd option but for multi CPUs..

[Maxer]

Yea so would I but from what I hear that's impossable with Maxwell. It just seems that once you get to a sample level of 17 or higher if the noise hasn’t gone away by then it's not going to. The NL guy's said that cooperative rendering was working but from what I see it's really not. Sure over a short period of time say less than 2 hours it seems to get farther along but stretch it out over 15 hours and there is little if no difference in noise. Before they went to Beta we purchased a large number of licenses from them, and one of the stipulations we made was that cooperative rendering had to work properly or we could get our money back. So far I'm not very impressed.

Also in the cooperative rendered image there are both black and yellow pixels everywhere that aren't in the single image. I wonder if this is the same artifact problem that was in 1.2.0?