CGTalk > Techniques > Lighting and Shaders
Login register
Thread Closed share thread « Previous Thread | Next Thread »  
Thread Tools Search this Thread Display Modes
Old 04-24-2013, 03:30 PM   #1
New Member
josh247's Avatar
Josh Bainbridge
Bristol, United Kingdom
Join Date: Jun 2008
Posts: 26
Ambient Occlusion Shaders in Renderman

Hi all,

Just been having issues creating ambient occlusion in renderman for maya for use as shadows later in comp. I have a scene where a character needs to be integrated with a background plate. There is a floor and wall planes that receive occlusion and also create it on the character itself. This is what I want but the issue is that it creates ambiant occlusion on itself in the corners of the room. How can I make the matte geometry not produce self ambiant occlusion?

Old 04-25-2013, 10:46 PM   #2
car unenthusiast
earlyworm's Avatar
Will Earl
Grizzly Country, Canada
Join Date: Mar 2005
Posts: 1,685
It relatively simple assuming your doing a separate shadow casting pass. For ambient occlusion you need to set the Diffuse Visibility on both the character and the room - you need to make sure the character is visible and the room is invisible.

In RMS you use shared geometric attributes to do this...

Note that other types of shadows use Transmission Visibility rather than Diffuse Visibility and reflection occlusion uses Specular Visibility.

In your beauty pass for your character you'll want to make sure that Diffuse Visibility is on for both the character and room.
Old 04-25-2013, 10:46 PM   #3
CGTalk Moderation
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 11:28 AM.

Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.