CGTalk > Techniques > Lighting and Shaders
Login register
Thread Closed share thread « Previous Thread | Next Thread »  
 
Thread Tools Search this Thread Display Modes
Old 11-11-2012, 08:53 AM   #1
evavfx
New Member
 
evavfx's Avatar
portfolio
Eva
Digital Lighter / Compositor
London, United Kingdom
 
Join Date: Mar 2007
Posts: 16
Lighting or Shading problem? = Weird

Hey guys

I am lighting Jeremy Birn's cabin challenge scene. I've used 2 area lights one point outwards and one pointing inwards for bounce light.

Has anybody seen this before? It's some really weird artifact or just plain weird thing going on the windows here. I really cannot solve the problem.
Attached Images
File Type: jpg weirdwindow.JPG (67.3 KB, 27 views)
 
Old 11-11-2012, 11:21 AM   #2
musashidan
Bar Stool Enthusiast
 
musashidan's Avatar
portfolio
Daniel McGrath
Dublin, Ireland
 
Join Date: Mar 2005
Posts: 3,814
I assume you're using Vray. Enable sub-pixel mapping in the colour mapping roll-out.

If using Mentalray play with the min/max sampling settings and lower the AA-contrast. Also, you could try different AA filters. Start with mitchell-netravali.

Last edited by musashidan : 11-11-2012 at 11:35 AM.
 
Old 11-11-2012, 01:21 PM   #3
evavfx
New Member
 
evavfx's Avatar
portfolio
Eva
Digital Lighter / Compositor
London, United Kingdom
 
Join Date: Mar 2007
Posts: 16
Sorry I should have mentioned that I am using Mental Ray and my global settings right now are

Raytracing only at this point (no FG or GI or AO)

It's on Max sample Level 1

Anti-aliasing contrast: 0.100

Filter: Mitchell
filter size: 4.00 4.00

Ray tracing:


I played around with the filter size, it's definitely related to that. I set it to 1.00 1.00 and it's far better to not visible anymore. Thank you

However I am not sure what else it might affect :s
 
Old 11-11-2012, 01:38 PM   #4
musashidan
Bar Stool Enthusiast
 
musashidan's Avatar
portfolio
Daniel McGrath
Dublin, Ireland
 
Join Date: Mar 2005
Posts: 3,814
Quote:
Originally Posted by emajordesign

However I am not sure what else it might affect :s


In relation to what?
 
Old 11-11-2012, 03:09 PM   #5
CHRiTTeR
On the run!
 
CHRiTTeR's Avatar
Chris
Graphic designer extraordinaire
Belgium
 
Join Date: Feb 2002
Posts: 4,381
Quote:
Originally Posted by emajordesign
It's on Max sample Level 1


im not a mental ray guy, but thats quite low
Set it to at least 16 to get good quality
 
Old 11-11-2012, 03:22 PM   #6
evavfx
New Member
 
evavfx's Avatar
portfolio
Eva
Digital Lighter / Compositor
London, United Kingdom
 
Join Date: Mar 2007
Posts: 16
I bumped it up to level 2 (16 samples) and it's still there.

However if the filter is set to 1.00 1.00, at a distance my overall render looks too sharp for my liking.

not sure, but I started to relight my scene again. Thank you for your help people.
 
Old 11-11-2012, 03:32 PM   #7
musashidan
Bar Stool Enthusiast
 
musashidan's Avatar
portfolio
Daniel McGrath
Dublin, Ireland
 
Join Date: Mar 2005
Posts: 3,814
If your render is too sharp than change your aa filter. Or increase the blur in mitchell filter. Also, enable final gather. Using only direct light will result in a highly contrasted render which will affect how the image sampler does its job.
 
Old 11-11-2012, 03:32 PM   #8
CGTalk Moderation
Lord of the posts
CGTalk Forum Leader
 
Join Date: Sep 2003
Posts: 1,066,480
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
CGSociety
Society of Digital Artists
www.cgsociety.org

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

All times are GMT. The time now is 05:28 PM.


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