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 14-08-2009, 06:07 AM   #1
rasta3d
Registered User
 
Join Date: Mar 2005
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default diamond caustic

Hi All...

Not sure if this is a Mental Ray or not...


Couple of questions on a diamond tutorial I was following.

> Why am I am getting so much grays, and not enough strong darks and lights?

> Why isn't my gradients nice and smooth? If you look closely, there seems to be something like dithering going on.

I went over the tutorial very closely and even the files. Not sure what I'm missing or what went wrong.

i pointed out the dithered areas in red.



links:
http://www.rossow-web.com/diamonds.jpg
http://www.rossow-web.com/diamond2.jpg


Any help would be great.
.roy.
rasta3d is offline   Reply With Quote
Old 14-08-2009, 08:34 AM   #2
mastone
Maniacal boy king of Babylon
 
mastone's Avatar
 
Join Date: Aug 2005
Location: the netherlands
Posts: 1,605
Thanks: 1
Thanked 59 Times in 58 Posts
Default

" Not sure if this is a Mental Ray or not..."
-check your rendersettings LOL

You probably have lit the scene with FG or GI, so it's probably the quality of that or the number of sampels have to be higher.
Regarding the dark areas in the diamond this has to do with the amount of photon's you have in the scene up the number of photons emitted by your image/light and maybe even up the photonintensity by a hair
mastone is offline   Reply With Quote
Old 14-08-2009, 08:35 AM   #3
mastone
Maniacal boy king of Babylon
 
mastone's Avatar
 
Join Date: Aug 2005
Location: the netherlands
Posts: 1,605
Thanks: 1
Thanked 59 Times in 58 Posts
Default

Oh and you need to increase the amount of "lightbounces" so more reflect/refract rays
mastone is offline   Reply With Quote
Old 14-08-2009, 06:08 PM   #4
Gen
Moderator
 
Gen's Avatar
 
Join Date: Dec 2006
Location: South FL
Posts: 3,457
Thanks: 13
Thanked 635 Times in 558 Posts
Default

Originally posted by rasta3d


> Why am I am getting so much grays, and not enough strong darks and lights?
You're getting a lot of grey because the backdrop has a lot of grey. If refractive surfaces don't appear as transparent as they should then you need to check a few things

*Under raytracing in the render settings, make sure there are enough refractions being traced, and that your max trace depth can keep up with both the reflections and refraction tracing.

Check out my cheesy text version of the MR render settings below

Reflections [ 2 ] --|---------
Refractions [ 6 ] --------|----
Max Trace Depth [ 8 ] ----|--------

8 maximum traces is enough to cover 2 reflection bounces + 6 refractive bounces.
Same thing for the Shadows settings, default its set to 2, so shadows will not be calculated through more than 2 surfaces which means you won't be able to see the shadow of an empty glass when looking through the glass.

Same thing with the photon tracing settings and Final Gather tracing.

Originally posted by rasta3d


> Why isn't my gradients nice and smooth? If you look closely, there seems to be something like dithering going on.
You're shadows are probably noisy because the samples on your light (s) are too low.
Gen is offline   Reply With Quote

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 - vBulletin® Copyright © 2000-2015, Jelsoft Enterprises Ltd.