DMC Sampler Tutorial

[InTercepto]

Great Tutorial!
I followed it (had to read a lot of sentences a few times ) and i test your settings on my latest animation job ( flying over a glossy/metal plate wow )
where i have nearly the same settings but always had the feeling that my rendertimes are way to high for simple glossy planes and such things. Before your tutorial i never dared to use material subdivs in the range of 50.

So the real speed boost came from just changing the material subdiv from 16 to 50! Not only speed (and i`m talking from somewhat 4 minutes to 1-2 minutes!, hd frame with just glossy plane and a few glass cylinders flying around)
but also a way cleaner surface on the plane. Min Max 1 / 5 and Clr thr 0.01

So now i don`t really get point why this happens?!
Bring subdivs way up, reduce rendertimes and increase quality with it?!

I guess this is the part with your formula in the tutorial, where material samples gets divided through max samples and so on.
As i said, i can clearly see the benefit in rendertimes and quality but i would like to understand the dependency between this parameters.

Maybe somebody could spot a little bit more light on this? Thanks in advance!

Grüße!

I think I explained everything in tutorial... and what you are getting is what you should get, specially when you have flat reflective surfaces. In these cases increasing number of samples in material will take load off DMC sampler and clean those reflections in Material sampling, and since you don't need a lot of image sampling handled by DMC you are getting faster cleaner results.
I'll update tutorial with one more illustration that will show this.... hopefully it will help understanding it.

[pg1]

Thank you, very informative

[Dariusz Makowski (Dadal)]

InTercepto I have a little questions, it seems u didn't cover it or I'm blind but what about light samples? Are they having any affect on diffuse/specular/reflection dmc etc etc?

[olika]

Hi InTercepto,
thanks for your reply. But i couldn`t stop thinking about it since i read your tutorial. So i wondered in which case it would be better for performance to put load on to the DMC or to take off from the sampler. Is it just with flat surfaces or are there also other factors? On what is it depending?