For those using the new beta ...

Stinkie

Try this:

In the image sampler rollout, set the image sampler type to adaptive dmc. Set the min and max subdiv values to 1 and 100. Uncheck 'use dmc sampler threshold'. Lower the color threshold to 0.003.

In the dmc sampler rollout, leave the settings at their defaults. Meaning: adaptive amount 0.85, noise threshold 0.01, min samples 8, and global subdivs 1.

Crank the (reflection) subdivs on your lights and mats up to 256.

rvdkruk75

And what should be the effect of these settings?

Krisidious

I got a nice crisp image... Although my color threshold to 0.003. does not go down that far. it only goes to 0.01... and I didn't set my reflections because I had not edited my materials at all.

Stinkie

@rvdkruk75 said:

And what should be the effect of these settings?

A considerable gain in speed. A quote from Stefan Laub, one of the Vray for C4D devs: "AA: as vray DMC is a very intelligent and complex system which deals not only with AA on the end,
but with any calculation in vray (GI, Glossy, lights, materials, image sampling), raising the max value of the AA often speeds up the scene greatly, as the max value reduces the need to sample the max subdivisions in lights and materials (as it is the same engine), a max AA of 100 renders faster than a max value of 4 if the scene uses area lights and glossy materials. the rendering might get a little more noisy when raising the AA max value, but you can compensate that in using the AA threshold value and lower it from 0.01(default) to 0.005 or lower. 1x100x 0.003 will be faster in many things than 1x4x 0.01 (!)"

I did some testing yesterday. Using 'orthodox' AA stettings, my test scene rendered in 2m20s. Using Laub's settings, it finished in 48s. I rendered the same scene at 10000 pixels wide, still using Laub's settings. It finished in ... 18 minutes.

andybot

shoot, learn something new every day. Thanks for sharing the knowledge

Stinkie

You're welcome. You tried the new 64 bit rendering? It works.

Quite happy with that. Now I don't have to buy C4D+Vray. Phew!

OSN58

stefanq

Aahh Stinkie , this is an old school type of post, like in the days of Asgvis forum....
I'm getting nostalgic here. Remember Biebel, FreeAgent, Andeciula, Migz, Theofas, Thomthom, Nomeradona and many many others.....Remember Damien Alomar posts?

valerostudio

This is a fantastic tip. I did a quick test and I am really impressed. It leaves me wondering why we haven't been told to do this before? I cant believe I just rendered a material with 256 subdivs in 3 minutes.

thomthom

@OSN58 thanks for posting the comparisons.

How does this setup work with Catmull-Rom AA?

Stinkie

@krisidious said:

Although my color threshold to 0.003. does not go down that far. it only goes to 0.01...

That's odd, Kris. It should be able to go lower than that.

@thomthom said:

How does this setup work with Catmull-Rom AA?

I suspect render time would go up a little.

thomthom

But would the different type of AA affect the result - considering it's a sharpening filter...

Stinkie

Hm, I'm inclined to think the visual difference would be negligible, but then I don't know that much about AA filters. I usually sharpen in PS, if at all.

OSN58

Unfortunately, it only works with 256 subdivs, render speed in other cases less.

Stinkie

Still -pretty neat, huh?

designo_84

Hi all,
Btw i tried your way as you described specifically to render hi poly car model (proxy) but the render times increased significantly

rspierenburg

I noticed the same as designo, increased render times with the new settings vs default.

andybot

I'm guessing it depends on the GI lighting... I tried this on an interior and my render times doubled. Seems to work fine on a simple exterior scene, but you need to decrease the reflection depth too to make it work. Otherwise, the reflection of reflections really bogs it down too. ymmv