In article <3992C86A.D9BF3996@schunter.etc.tu-bs.de>, 
chr### [at] gmxde wrote:

> This technique seems to combine several renderings to a final 
> picture.  The Povray equivalent would be using the post_process 
> function.  
> For example: seperate rendering of clouds, sky gradient, sun glow 
> (media), lens flare and combining them with post_process.  

Well, this is because it is a real-time program...the analog of the sky 
gradient would be fog or media, and the lens flare and sun glow could be 
done with layered textures. Actually, all of it should be possible with 
layered textures, but it wouldn't look right for other stuff in the 
scene.
The perlin noise textures were generated beforehand, but I doubt using 
image_maps in POV would save more than a couple seconds of render 
time...again, they only used 4 interpolated maps because it is a 
real-time program.


> It's definitely worth trying, but on the other hand, the light does not
> influence the clouds directly in this technique, so it can't simulate the
> "glowing" of clouds on the side directed towards the sun.  

This is the big flaw of this method...it is only partially 3D, and 
doesn't simulate shadows or the effects of the cloud volume.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

Post a reply to this message