CGTalk > Techniques > Lighting and Shaders
Login register
Thread Closed share thread « Previous Thread | Next Thread »  
Thread Tools Search this Thread Display Modes
Old 10-07-2012, 05:54 AM   #1
Join Date: Mar 2004
Posts: 91
Vray for Maya - Ambient Occlusion greyed out?

So it took me quite a bit of searching on how to turn ambient occlusion on in the render globals for Vray in Maya.

I used this mel script: setAttr "vraySettings.aoOn" 1;

But now the question is why? Why does Vray grey it out? It seems like no matter what I turn off and on its always greyed out, is there a reason for this?
Old 10-16-2012, 09:59 AM   #2
Bud Dho
3D Artist
Join Date: Jan 2002
Posts: 100
Send a message via ICQ to Buddho
Ambient Occlusion in the Indirect Lighting tab is linked to GI. If you want to get classical AO you can use the Vraydirt map in your shaders or you render out an extra texture renderlayer with a vraydirt and blend it over your beauty pass in comp.
Old 10-16-2012, 10:36 AM   #3
FranciscoSCN's Avatar
Francisco Nogueira
Porto, PT
Join Date: Mar 2006
Posts: 75
Which begs the question: why does V-Ray have an Ambient Occlusion option in the GI tab? Isn't the whole AO pass a cheat for a cheap GI effect?

Doesn't the AO darkness effect get solved naturally by regular GI methods? That is, by using regular GI, we shouldn't even need an AO pass, as the GI calculations are more physically correct right?
Old 10-17-2012, 03:34 PM   #4
rope folly
Rens's Avatar
Rens Heeren
Senior Generalist
Singapore, Singapore
Join Date: Nov 2003
Posts: 1,938
AO for GI is there to have the option of bringing back small details which might be missed by for instance irradiance mapping, as it usually blurs the samples quite a bit. It's not perfect but for a lot of situations it's enough to bring back some detail, and you can lower the GI settings as well.
VFX Artist
// OSL Shaders //
Old 10-17-2012, 03:34 PM   #5
CGTalk Moderation
Lord of the posts
CGTalk Forum Leader
Join Date: Sep 2003
Posts: 1,066,478
Thread automatically closed

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.
CGTalk Policy/Legalities
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
Thread Closed share thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 11:02 AM.

Powered by vBulletin
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.