Light Spectrum Effect

Become a member of the CGSociety

Connect, Share, and Learn with our Large Growing CG Art Community. It's Free!

THREAD CLOSED
 
Thread Tools Search this Thread Display Modes
Old 03 March 2003   #1
Question Light Spectrum Effect

How would I create the effect of a white light breaking into its spectrum, as if it were shinig through a crystal prism? A good example of this effect can be found here http://splutterfish.com/sf/gallery_...2&action=images . Ive been experimanting with caustic lighting, but I don't think it can achieve the effect I need.

Any suggestions or helpful hints would be much appreaciated.
 
Old 03 March 2003   #2
The "chromatic aberration" checkbox is supposed to give you colors like that when you're using refraction. I don't think that gets cast into the Caustics though, so you'll have to build the effect yourself.

Render the scene at least 3 times, with white light and no chromatic aberrations, but with 3 different Refractive Index settings on the surface, making slightly different position gray caustics in each render. Comp the passes together with one going into the red channel, one into green, one into blue, and you'll have colors added to the gem and the caustics. If there are banding artifacts, use more than 3 passes and tint them into secondary colors as well.

-jeremy
__________________
Jeremy Birn
Author, Digital Lighting & Rendering, 3rd Edition
 
Old 03 March 2003   #3
Hmm ok, how about the image I've attached? I managed to get that in Mental Ray.

I used caustics but the colours are not the proper accurate colours, I just used a photon shader and applied a ramp to it. That way you could choose what colours you want the caustics to split into!
 
Old 03 March 2003   #4
Thumbs down

Thank you both! This is exactly what I am talking about. I'll try both techniques and see which I get a better effect from.
Much appeciated.
 
Old 01 January 2006   #5
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



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 02:43 PM.


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