Alberto wrote:
> I agree with you. I'll change the knob, may be using a Bezier prism.

How about using some isosurface? Your knob reminded me of that in
Isosurface Tutorial (on page
http://www.econym.demon.co.uk/isotut/builtin.htm) and I made few quick
trials. Source and results are below.


     * * *

#version unofficial MegaPov 0.7;

default {
  texture {
    pigment { rgb <1,0,0> }
  }
}

camera {
  location  <      16,     16,      10>
  sky       <    0.00000,     0.00000,     1.00000> // Use right
handed-system 
  up        <        0.0,         0.0,         1.0> // Where Z is up
  right     <    1.35006,         0.0,         0.0> // Right Vector is
adjusted to compensate for spherical (Moray) vs. planar (POV-Ray) aspect
ratio
  angle         12.00000    // Vertical      24.750
  look_at   <      0,       0,      0>
}

light_source {            
  <75, 50, 50>
  color red 1.0  green 1.0  blue 1.0  // light's color
}

#declare Theta  = function{"TH"}

isosurface {  // Spherical
  function{ x*x + y*y + z*z + sin(Theta*20)*0.05*(1-abs(y)) }
  method 2
  max_gradient 8
  threshold 1
  sign 1
  contained_by { box{ -1.1, 1.1 } }
  pigment {rgb 1}
  finish { phong 0.5 }
  translate <0.9, -0.9, 0.9>
}

isosurface { // Quadrical
  function { x*x + (y*y)*0.6 + (y*y*y*y)*0.4 + z*z +
sin(Theta*20)*0.05*(1-abs(y)) }
  method 2
  max_gradient 8
  threshold 1
  sign 1
  contained_by { box{ -1.1, 1.1 } }
  pigment {rgb 1}
  finish { phong 0.5 }
  translate <-0.9, 0.9, 0.9>
} 

isosurface {
  function { x*x + (y*y*y*y*y*y) + z*z + sin(Theta*20)*0.05*(1-abs(y)) }
  method 2
  max_gradient 8
  threshold 1
  sign 1
  contained_by { box{ -1.1, 1.1 } }
  pigment {rgb 1}
  finish { phong 0.5 }
  translate <0, 0, -0.9>
} 
 
     * * *

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