hi,

newbie, first post.

having installed v 3.6.1 and played with it for a few days, I decided
that Ferguson's Umbilic Torus [1] would make a fine, first project.

alas, my lack of (mathematical) ability gets in the way of progress. :-(

using the scene file below, I get nothing but a black image.  I
interpret this output
  ------------------------------------------------------------------
  Ray->Shape Intersection          Tests       Succeeded  Percentage
  ------------------------------------------------------------------
  Parametric                      788225               0      0.00
  Parametric Bound                788225          788225    100.00
  ------------------------------------------------------------------
to mean that while the rays hit the default bounding box, they do not
hit the object that's meant to be inside [2].

I've tried various scales for the object and am now out of ideas.

---------- <snip> ----------
// umbilic.pov
// Helaman Ferguson's Umbilic Torus
#version 3.6;

#include "colors.inc"

camera {
  location <0,2,-5>
}

light_source {
  <0,5,0>
  color White
}

// equations from 3dps2v.tk
#declare oUmbilic = parametric {
  function {
sin(pi*u)*(7.0+cos((pi*u/3.0)-(2.0*pi*v))+2.0*cos((pi*u/3.0)+(pi*v))) },
  function {
cos(pi*u)*(7.0+cos((pi*u/3.0)-(2.0*pi*v))+2.0*cos((pi*u/3.0)+(pi*v))) },
  function { sin((pi*u/3.0)-(2.0*pi*v))+2.0*sin((pi*u/3.0)+(pi*v)) }
  <-1.0, -1.0>, <1.0, 1.0>
  contained_by { box { -1.1, 1.1 } }
//  accuracy .0001
}

object {
  oUmbilic
//  texture { uv_mapping pigment { Aquamarine } }
  pigment { rgb 1 }
}

---------- <snip> ----------

any help appreciated.



[1] en.wikipedia.org/wiki/Umbilic_torus
    en.wikipedia.org/wiki/Helaman_Ferguson

[2] I got the x,y,z functions from Blaise Montandon's neat "3D Examiner
for Parametric Surfaces" program which can be found at wiki.tcl.tk/37524.

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