In article <39885E9B.49E5E5C9@mail.wh2.tu-dresden.de>, Michael Zier 
<zie### [at] mailwh2tu-dresdende> wrote:

> Well, I just don't have any idea, how to animate the media in an
> realistic way. Just to cycle through the phase property would look ugly.

You could translate the pattern a bit, apply turbulence, and then 
translate it back. Control the distance you translate it using the clock 
variable, and you could get a kind of animated turbulence.
You could also combine several patterns(using isosurface functions), 
each with different rates of rotation/translation.


> BTW, there could be a kind of non-linear transform in future versions of
> POV, e.g. 
> transform {
>  non_linear {
>   x=f_x(x,y,z)
>   y=f_y(x,y,z)
>   z=f_z(x,y,z)
>  }
> }
> this could be very useful in modifying patterns used in media densities.

There is already a way to apply non-linear transforms to patterns: 
warps. And I have been working on a way to do exactly what you describe, 
using the displace warp and a new pigment which takes an isosurface 
function for each color component.(I actually have it coded, but haven't 
tested it yet.)


> Anyway, if anyone has any idea of animate media realistically, let me
> know.

You could do it with a bunch of particles. :-)

-- 
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/

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