|10 October 2011||#1|
Join Date: Feb 2011
I have made an example of "Diamond".
Diamond has very high "refractive index" and "dispersion", so it reflects light rays well, and makes fire from inside light rays.
However, current CINEMA 4D does not have the "dispersion" function (even R13 does not). Also there is basic limitation to simulate the dispersion in 3DCG softwares which uses simple "RGB" color model, if you use other renderers which support the dispersion, you can not get good result.
So I took very simple solution that "render many pictures, and composite them". Fortunately, CINEMA 4D has "Scene Motion Blur (SMB)" which composites many pictures automatically, so you do not need to do this by your hand.
The dispersion is very simple idea that "the refractive index varies by color (wave length)". So only you need to do in CINEMA 4D is animate color of lights (or luminated materials) and refractive index to corresponding values.
Additionally to automate this process with SMB, you need to complete one cycle of animations in just 1 frame. Then I desided to use "9 times SMB" first, and changed frame rate of the scene to "270 fps (30*9)"
Next, I recorded keys of "color" and "refractive index" from 0 to 9 frames, and set the track to "cyclic".
That is all, when you render this scene, 9 pictures are rendered in 1 frame and they are composited to 1 picture. You may be understand the process easily by redering the sample scene
Last edited by tofuji : 10 October 2011 at 08:51 PM.
|10 October 2011||#5|
Join Date: Sep 2003
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.
Note that as CGTalk Members, you agree to the terms and conditions of using this website.
|Thread Closed share thread|