SimplyMaya Forums

Welcome to the forum, feel free to ask questions here.

Home / forum / Lounges / Maya Basics & Newbie Lounge / mental ray question
Register FAQ Members List Calendar Mark Forums Read

New Thread
 
Thread Tools
Old 25-05-2007, 01:13 PM   #1
Rhetoric Camel
Subscriber
 
Rhetoric Camel's Avatar
 
Join Date: Dec 2006
Location: Plattsburgh New York
Posts: 1,222
Thanks: 6
Thanked 28 Times in 23 Posts
Default mental ray question

Why does it render with these round specs of light on the front like this?



I'm don't know much about mental ray so I'm including everything I have changed or may have changed. Hopefully this is helpful for you to help me out.

Render Global Settings

Ray Tracing: On
Reflections: 2
Refractions: 2
Max Trace Depth: 4
Shadow Trace Depth: 2
Scanline: On
Faces: Both

Global Illumination: On
Global Illum Accuracy: 200
Global Illum Radius: 2.00
Global Illum Scale: White
Photon Volume Accuracy: 64
Photon Volume Radius: 0
Max Photon Depth: 5
Rebuild Photon Map: Check
Max Reflection Photons: 5
Max Refraction Photons: 5


Two Spotlights, no decay
Main Spotlight
Emit Photons: Check
Photon Intensity: 24000
Exponent: 1
Global Illum Photons: 1000

Second Spotlight
Emit Photons: Check
Photon Intensity: 16000
Exponent: 1
Global Illum Photons: 1000
__________________
- Mike

http://rhetoriccamel.blogspot.com
Rhetoric Camel is offline   Reply With Quote
Old 25-05-2007, 01:31 PM   #2
vladimirjp
Subscriber
 
vladimirjp's Avatar
 
Join Date: Jun 2003
Location: stuck in the 90's boston, USA
Posts: 1,871
Thanks: 0
Thanked 4 Times in 3 Posts
Default

Global Illum Photons: 1000

i would increase to like a million
vladimirjp is offline   Reply With Quote
Old 25-05-2007, 02:46 PM   #3
Rhetoric Camel
Subscriber
 
Rhetoric Camel's Avatar
 
Join Date: Dec 2006
Location: Plattsburgh New York
Posts: 1,222
Thanks: 6
Thanked 28 Times in 23 Posts
Default

I turned it up to 1000000 and it got rid of the problem, but other than that I don't see much of a difference and it turned my 40 second render time into a 45 minute render time. Is there really a need for it to be up that high on both lights?


I even forgot to do a poly smooth on it before the render. Thats alright I'm lacking in colors for the lights, interior, and tires

thanks for the help vlad... any other tips to make this car render look better I'm all ears.
__________________
- Mike

http://rhetoriccamel.blogspot.com
Rhetoric Camel is offline   Reply With Quote
Old 25-05-2007, 11:19 PM   #4
publicFunction
Senior Software Developer
 
publicFunction's Avatar
 
Join Date: Jan 2005
Location: Livingston, Scotland
Posts: 1,701
Thanks: 1
Thanked 23 Times in 23 Posts
Default

Turn off Caustics, and just leave GI in place.
__________________
Chris (formerly R@nSiD)
Twitter
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)
publicFunction is offline   Reply With Quote
Old 29-05-2007, 08:15 PM   #5
Rhetoric Camel
Subscriber
 
Rhetoric Camel's Avatar
 
Join Date: Dec 2006
Location: Plattsburgh New York
Posts: 1,222
Thanks: 6
Thanked 28 Times in 23 Posts
Default

I never turned caustics on, thanks though.
__________________
- Mike

http://rhetoriccamel.blogspot.com
Rhetoric Camel is offline   Reply With Quote
Old 30-05-2007, 03:04 AM   #6
ctbram
Moderator
 
ctbram's Avatar
 
Join Date: Jan 2004
Location: Michigan, USA
Posts: 2,997
Thanks: 42
Thanked 582 Times in 532 Posts
Default

You could try final render stage-2.

Or you could try to actually figure out how to set the 8 bazillion properties of mental ray. I would recommend first getting a 15 year phd in pan-hyper-dimensional-quantum-photonic-light-physics that could help to understand the settings (a little). lol

Sorry to be making jokes but I have recently been struggling with mental ray and man that package really drives me insane. There are no useful guides to workflow and help files in maya are useless. They read like a poorly translated japanese to english stereo manual.

I have paid for a couple of tutorials and they were not much help. The instructor seems to randomly pull values out of his butt and does nothing to explain what they do and why. As an example at one of my favorite lessons he says and I quote ...to use this option you will have to make quite large changes in the antialieas settings... and then he proceeds to change the value from 0 to 1. Hmmm his definition of "very large" and mine are quite different. It would seem to me that moving from 0 to 1 is the smallest possible unit of change you can make! To make things worse the change made the render go from 7 seconds to 45 seconds.

To me mental ray is too complicated and with no users guide that explains workflow it's almost mystical as to how it works. I have seen stuff done in vray and have fiddled with a trial version of final render and they both seem more intuitive to use.

Last edited by ctbram : 30-05-2007 at 03:07 AM.
ctbram is offline   Reply With Quote
Old 30-05-2007, 07:53 PM   #7
Rhetoric Camel
Subscriber
 
Rhetoric Camel's Avatar
 
Join Date: Dec 2006
Location: Plattsburgh New York
Posts: 1,222
Thanks: 6
Thanked 28 Times in 23 Posts
Default

yeah mental ray is a pain right in the ass. I've been using maxwell 1.1 and it seems pretty good, I just hate the render times, but then again mr wasn't rendering any faster when I boosted up the photons.
__________________
- Mike

http://rhetoriccamel.blogspot.com
Rhetoric Camel is offline   Reply With Quote
Old 31-05-2007, 02:21 AM   #8
Funky Bunnies
Subscriber
 
Funky Bunnies's Avatar
 
Join Date: Mar 2005
Location: Illinois, USA
Posts: 250
Thanks: 0
Thanked 0 Times in 0 Posts
Default

MR's many settings can be nice actually. You can increase the photon size and then the filter so that the samples are blurred together. Really it's all about the tweaking.
__________________
www.funkybunnies3d.com
Funky Bunnies is offline   Reply With Quote
Old 31-05-2007, 03:31 AM   #9
publicFunction
Senior Software Developer
 
publicFunction's Avatar
 
Join Date: Jan 2005
Location: Livingston, Scotland
Posts: 1,701
Thanks: 1
Thanked 23 Times in 23 Posts
Default

Mental Ray is fantastic, its just very dificult to set up and use. It just takes time and practice. I refuse to use Maxwell due to a couple of things.

Does not work directly in Maya (MR does)
The render times are rediculus

Try Renderman better renders and 1000x faster.
__________________
Chris (formerly R@nSiD)
Twitter
When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)

Last edited by R@nSiD : 31-05-2007 at 03:34 AM.
publicFunction is offline   Reply With Quote
Old 31-05-2007, 04:32 AM   #10
gster123
Moderator
 
gster123's Avatar
 
Join Date: May 2005
Location: Manchester Uk
Posts: 6,300
Thanks: 1
Thanked 51 Times in 45 Posts
Default

If you spend a little time with MR you can get some great results with it for quite a small render time, for example the guitar that I did was rendering a frame in 20 mins, Once you get the hang of what the settings do you can get going pretty fast.


The more photons that you add to the scene the longer the render time, I doubt that it would get to the render times of Maxwell though.

End of the day it does take a bit of fiddeling to get the render looking nice, but its worth it.
__________________
"No pressure, no diamonds" Thomas Carlyle
gster123 is offline   Reply With Quote
Old 01-06-2007, 10:08 AM   #11
Rhetoric Camel
Subscriber
 
Rhetoric Camel's Avatar
 
Join Date: Dec 2006
Location: Plattsburgh New York
Posts: 1,222
Thanks: 6
Thanked 28 Times in 23 Posts
Default

alright thanks for all the help, I'll be giving mental ray more of a chance. I have some tutorials that I'll be checking out to kind of get the feel of it and from there just tweek. I feel like I'm always tweeking things, if it's not geometry, it's rendering, and if it's not either one of those then I'm tweeking colors in photoshop. Thanks again for all the help!
__________________
- Mike

http://rhetoriccamel.blogspot.com
Rhetoric Camel is offline   Reply With Quote
New Thread

« Previous Thread | Next Thread »

Thread Tools

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

1 Month

$34

Month-to-month billing
$34/month
Unlimited access to all videos
Project files to download
Easy to cancel at anytime
 
 

3 months

$87

Billing every 3 months
$29/month
Unlimited access to all videos
Project files to download
Easy to cancel at anytime
Save $5 per month or $15 in total compared to monthly billing with this package.

12 months

$288

Billing every 12 months
$24/month
Unlimited access to all videos
Project files to download
Easy to cancel at anytime
Save $10 per month or $120 in total compared to monthly billing with this package.

Your plan will automatically renew. You can cancel at any time via your PayPal account to avoid being charged again.

You can view the FAQ on our video plans here. You can contact us directly here. By clicking one of the buttons above, you agree to our Terms and Privacy Policy.