Sorry for the delay for the reply...


> Well, there is only a couple about isosurfaces I'm real familiar with
> although there might be others.
> 
> http://www.zeropps.uklinux.net/isotut/
> 
> http://www.econym.demon.co.uk/isotut/index.htm


I just bookmarked them and will start reading as soon as possible!


> I saw your animation, of what could be called a drill auger, and unless the
> size of the bounding box or sphere that you used for it changes it I'm not
> sure about scaling it wider. Just now looking at it.
> 
> Okay, looked and tried and changed:
> 
> // scaling values
> #declare Xs=1.5;
> #declare Ys=1.5;
> #declare Zs=2.5;
> 
> isosurface {
> function {
>   ((x*Xs)*cos((z+2*Zs*clock)*2*pi) + x*x +
>   (y*Ys)*sin((z+2*Zs*clock)*2*pi) + y*y)
> }
> threshold 0
> max_gradient 12 // increase as larger scales are used
> accuracy .001
> contained_by {box {-<1*Xs,1*Ys,1*Zs>,<1*Xs,1*Ys,1*Zs>}}
> pigment {rgb 1}
> //finish {ambient .5}
>  rotate <0,0,0>
>  translate 3*z
> }

Hmmm, I'd need to render this to see how it changes the scene...  will
do as soon as possible also! ;)

> First thing to take notice of in your equation is that version 3.5 is not
> able to see the ^ symbol,  you will need to use pow(x,2) instead. Or
> mulitply a value by itself, as I did here. I don't know if I ended up with
> the iso correctly, just a quick hack at it to see if it would scale upward
> as I expected (which it did I think).

Okay, good...  since I will probably not render the final IFS movie
myself, I will probably pass it to friends or to Rafal that have better
computers than I!


Although, I'm very occupied these days, I will try to get more serious
into this project as soon as my mind permits it!

Thanks a lot Bob,
  Simon

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