45254e09$1@news.povray.org...
>
> Would anyone be so kind as to show me a simple example of how to
effectively
> use these images to map onto a disc (or similar)?
>
> - How (?)

This way ;-)


camera {
  location  <0.0, 15, -30>
  direction 1.5*z
  right     x*image_width/image_height
  look_at   <0.0, 0.0,  0.0>
  angle 5
}



light_source {
  <0, 0, 0>            // light's position (translated below)
  color rgb <1, 1, 1>*1.5  // light's color
  translate <-30, 3, -30> *1000
}
#declare Int_radius =1; //disc minor radius
#declare Ring_width= 0.2; //disc width
#declare Lum=3; // color luminance
#declare T_factor=0.5; //transparency map amount

// functionalization of the colormap
#declare img =
  pigment{
   image_map{
    png"sat_ring_color.png"
   }
   scale Ring_width
  }

#declare f_img =
function{
  pigment{ img }
}

// functionalization of the transparency map

   #declare trans =
  pigment{
   image_map{
    png"transparency.png"
   }
   scale Ring_width
  }

#declare f_trans =
function{
  pigment{ trans }
}

//recombination of color componants in a concentric way
#declare Ring_pig =
  pigment{
   average
   pigment_map{
    [1 function{ f_img(sqrt(x*x+y*y)-Int_radius,0,0).x } color_map{[0 rgb
0][1 rgb x*Lum]} ]
    [1 function{ f_img(sqrt(x*x+y*y)-Int_radius,0,0).y } color_map{[0 rgb
0][1 rgb y*Lum]} ]
    [1 function{ f_img(sqrt(x*x+y*y)-Int_radius,0,0).z } color_map{[0 rgb
0][1 rgb z*Lum]} ]
    [1 function{ f_trans(sqrt(x*x+y*y)-Int_radius,0,0).z } color_map{[0 rgb
0][1 rgbt<0,0,0,1>*T_factor ]} ]
   }
  }

disc { <0, 0, 0>, z,Int_radius+Ring_width, Int_radius texture {pigment
{Ring_pig }finish{ambient 0 diffuse 1 brilliance 0.2}}rotate x*90}

sphere{0,Int_radius*.8 texture{pigment{color rgb 1} finish {ambient 0
diffuse .6 }}}//place holder


HTH
Marc

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