I'm not sure if you want it. Tray with this code:

======================================
#declare RopeHoop = function { f_helical_torus(x,y,z, 5, 7, 2, 1.0, 1, 0.5,
0.25, 1, 1.0, 0) }

isosurface {
function { RopeHoop(x,y,z) }
max_gradient 7
contained_by { sphere { .4, 50*2 } }
translate x*10
scale 1
rotate 0*x
texture {
pigment { color rgbf <1, 0, 0, 0> }
finish  { ambient 1 diffuse 1 }
} }
======================================

Regards,
Oleguer





news:417fdd12$1@news.povray.org...
> "Renderdog" <slo### [at] hiwaaynet> wrote in message
> news:web.417fcc974c4748cb4428009b0@news.povray.org...
> > "David Robinson" <tdf### [at] ezrscom> wrote:
> > > Ah, thanks for the tip. Looks good - but I'm afraid I don't understand
> POV
> > > enough yet to debug this:
> > >
> > > Parse Error: Expected 'object or directive', function identifier found
> > > instead
> > >
> > > So, I'm assuming either my syntax is all wrong (I literally
copy/pasted)
> or
> > > I should have some #include files.
> > >
> > > Sorry about this, I'll be off everybody's back soon :)
> >
> > An isosurface requires more than just the function, you'll
> > have to read the documentation to make use of the helix
> > functions in an isosurface.
> >
> > Here's a little more to go on, but you'll probably have
> > difficulty with it until you play with the simpler isosurfaces
> > first.
> >
> > #local RopeHoop = function {
> >  f_helical_torus(x,y,z, 100, 60, 2,
> >          1.0, 1,
> >          0.5,
> >          0.25, 1, 1.0, 0)
> >             }
> >
> > isosurface {
> >  function { RopeHoop(x,y,z) }
> >  max_gradient 3.0
> >  contained_by { box { <0, 0, 0>, <110, 10, 75> } }
> >  scale 0.04
> >  rotate -90*x
> >       }
>
> Thanks a lot for the tip - nearly all sorted now. This is the code so far:
>
> --
> global_settings {
>     radiosity {}
> }
>
> camera {
>     location <0, 0, -5>
>     look_at 0
> }
>
> background { color rgb <1, 1, 1> }
> global_settings { ambient_light color rgb <0, 0, 0> }
>
> #include "functions.inc"
>
> #declare RopeHoop = function {
>          f_helical_torus(x,y,z, 5, 7, 2,
>          1.0, 1,
>          0.5,
>          0.25, 1, 1.0, 0)
>                            }
>
> isosurface {
>  function { RopeHoop(x,y,z) }
>  max_gradient 1
>  contained_by { box { <0, 0, 0>, <200, 200, 200> } }
>  scale 0.1
>  rotate 90*x
>  texture {
>   pigment { color rgbf <1, 0, 0, 0> }
>   finish  { ambient 1 diffuse 1 }
>   }
>       }
> --
>
> Only real problem right now is that it only renders 1/4 of the scene (but
I
> have a feeling it is more likely to be building 1/4 of the model). I've
> tried playing with a couple of settings but nothing is making enough of a
> difference to hit me in the face with a clue...!
>
> I'm also trying to view this from top down.
>
> Thanks a lot,
>
> David
>
>

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