Maya Training

Introduction to Hard Surface Modeling

Maya Training

Interiors and Furniture Vol 1 & 2 - Modeling & Cloth

Maya Training

Shading, Lighting and Rendering the Bedroom in MR

Maya Training

Robot volume one - Modeling with animation in mind

Maya Training

Spach-Alspaugh House the complete courseware

Maya Training

Burt The Cartoon Dinosaur Vol 01 - Modeling

New Maya Training

Robot Volume 02 - Hybrid Rigging
You are here > Home > SimplyMaya Community Forums
Loading

Welcome to Simply Maya

Please Sign in or Sign up for an account

Member Login

Lost your password?

Not a member yet? Sign Up!

Old 16-11-2005, 01:09 PM   #1
sjurick
Subscriber
 
sjurick's Avatar
 
Join Date: May 2003
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
Default Artifacts in DOF - Mental Ray render

Hello all. I'm getting some strange artifacts in a render using IBL, and some DOF on the camera. The artifacts or fuzz as I refer to it only occur when the DOF on the camera is turned on.

Any ideas of what to change?

I'm using FG and 10000 rays, but doesn't seem to make a diff how many I use.
Attached Thumbnails
 
__________________
"Please excuse the crudity of this model, I didnít have time to build it to scale or to paint it"
:: Dr. Emmett Brown
sjurick is offline   Reply With Quote
Old 19-11-2005, 07:50 PM   #2
JDigital
Registered User
 
JDigital's Avatar
 
Join Date: Mar 2005
Location: Salt Lake City, UT U.S.A.
Posts: 160
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I had a similar problem with my render which I posted on


http://forum.simplymaya.com/showthre...threadid=19050


Someone had a good idea, maybe this will help


"Try upping the Final Gather rays to 500-1000 maybe. If that doesn't work , increase it to 2000. But it might be that the actual model is too small, or too large. Since MR uses actual Model size and size characteristics for FG and Photon emission calculations, if your model is longer then 20 units or smaller then 3 or 4, then you should scale it to be between those two values."
JDigital is offline   Reply With Quote
Old 19-11-2005, 08:07 PM   #3
MattTheMan
Registered User
 
MattTheMan's Avatar
 
Join Date: Apr 2005
Location: Fairfield, CT
Posts: 2,436
Thanks: 0
Thanked 18 Times in 18 Posts
Default

Im glad my information is helping peeps!
BTW, theres nothing wrong with fuzzy chrome lol!
__________________
Live the life you love, love the life you live
MattTheMan is offline   Reply With Quote
Old 20-11-2005, 04:55 PM   #4
sjurick
Subscriber
 
sjurick's Avatar
 
Join Date: May 2003
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Well, I checked the objects which were a group of balls and the ground object, and it was at 45 units large. I scaled it down to 9.5 units, rendered again from different angle and changed the DOF settings to match my new angles since the size of the model changed significantly.

Now the problem seems to be worse than better. The first image in this thread used 10000 rays for FG, this image uses 50000 rays. I wonder if the amount of rays is actually hurting me here?

I've attached two more pics. One with 50K FG rays and one with 100 FG rays. I don't think it's the FG doing this or maybe I have another setting wrong.
Attached Thumbnails
 
__________________
"Please excuse the crudity of this model, I didnít have time to build it to scale or to paint it"
:: Dr. Emmett Brown
sjurick is offline   Reply With Quote
Old 21-11-2005, 03:20 PM   #5
sjurick
Subscriber
 
sjurick's Avatar
 
Join Date: May 2003
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
Default

No matter what I do I cannot get rid of the fuzz so I'm thinking that there is a problem with using regular Camera DOF with Mental Ray. Should I be using the Mental Ray Physical Lens DOF node instead? Are there known problems with MR and Maya Camera DOF?
__________________
"Please excuse the crudity of this model, I didnít have time to build it to scale or to paint it"
:: Dr. Emmett Brown
sjurick is offline   Reply With Quote
Old 21-11-2005, 04:50 PM   #6
Alan
Moderator
 
Alan's Avatar
 
Join Date: Oct 2002
Location: London, UK
Posts: 2,800
Thanks: 0
Thanked 5 Times in 5 Posts
Default

you shouldn't be using maya's dof. it's crap basically! What you need ot do is render a depth pass separately and use that in photoshop/shake/after effects etc to blur the image. This way you wouldn't have to re-render with your 50k rays (which is an obscene amount of rays btw! ) and you cna tweak it till it looks perfect. I'd do that rather than mess with the render settings.


A
__________________
Technical Director - Framestore

Currently working on: Your Highness

IMDB
Alan is offline   Reply With Quote
Old 21-11-2005, 05:01 PM   #7
sjurick
Subscriber
 
sjurick's Avatar
 
Join Date: May 2003
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Ya, I actually tried working with the MR DOF lens and it worked great, but took about a 100 times longer b/c I had to also increase AA way up.

I'm not used to rendering in passes (I know I should become familiar with it so why not now?) I looked it up and see that I have several choices but not Depth. How do I render a depth pass?
__________________
"Please excuse the crudity of this model, I didnít have time to build it to scale or to paint it"
:: Dr. Emmett Brown
sjurick is offline   Reply With Quote
Reply


Similar Threads
Thread Thread Starter Forum Replies Last Post
Batch Rending Render Layers Ozgalis Lighting & Rendering 7 07-01-2011 07:04 PM

Thread Tools





A little bit about who we are
Links you might find useful
Catch up with SimplyMaya
SimplyMaya specialises in Maya tutorials. We offer over 1,000 individual Maya training videos, ranging from basic Maya tutorials through to intermediate Maya tutorials. Our tutorials are created by instructors with industry experience and are designed to get you up and running in Maya quickly without making it seem like hard work.

Copyright © 1999-2015 SimplyMaya - vBulletinģ Copyright © 2000-2015, Jelsoft Enterprises Ltd.