Vray DMC Sampler question

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

Thread Tools Search this Thread Display Modes
  04 April 2014
Vray DMC Sampler question

Hi there,

I have a query about how the Adaptive DMC sampler works.

I understand that the DMC sampler will analyze the amount of noise in the render bucket and throw more samples at it until it meets the noise threshold, however I was wondering if anyone could explain in basic terms how the "Adaptive amount" value works.

A value of 1.0 means fully adaptive, which I understand as the DMC sampler will sample everything in the bucket until noise is gone.

But what does a value of 0, or no adaptation mean? What does Vray actually do on this setting?

And more importantly how does the DMC sampler work with in between values, ie. the default of 0.85?

Thanks a lot
  04 April 2014
This is also essential reading for Vray users. You will see why the universal/neederhoorst settings are obsolete. and bear in mind that the workflow has changed in Vray 3, with the introduction of the 'divide shading subdivs' checkbox.

Akin Bilgic Link
  04 April 2014
Thanks, that was interesting reading and definitely a good workflow.

I've yet to use Vray 3 properly and I don't have access to it right now. I've merely read the manual on 'divide shading subdivs'.

It seems to me that having that option enabled makes workflow quite rigid as if you find that you need to raise your AA subdivs halfway through a project, wouldn't you need to manually go through each material, light, etc to keep samples at a reasonable level?

ie. in Vray 2
if max AA subdivs 4 and light subdivs were 8, (64/16 = 4 samples)
if max AA subdivs were raised to 8 and light subdivs were 8, (64/64 = 1 sample)

In Vray 3 with divide shading subdivs. (I assume you have to reduce light subdivs significantly to get a similar number of samples)
if max AA subdivs 4 and light subdivs were 1, (4*1 = 4 samples)
if max AA subdivs were raised to 8 and light subdivs were 1, (8*1 = 8 samples)

So that means at a max AA of 8, the light samples would jump from 1 to 8?

I'm not sure if I've interpreted this how setting works correctly. Would be great to find out.

reply share thread

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Society of Digital Artists

Powered by vBulletin
Copyright 2000 - 2006,
Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump

All times are GMT. The time now is 03:12 AM.

Powered by vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.