By the way, could you test the speed of this example scene in order to
make a comparison? Render it with the following command line options:

-f -d -x -p -w640 -h480 +a.1

  It took 1 minute 57 seconds to render in a Sun Ultra10 machine (which
has a 440 MHz UltraSparc processor).

----------8<----------8<----------8<----------8<----------8<----------
camera { location <0,2,-2> look_at y*.2 angle 35 }
light_source { <10,10,-5>, 1 }

#declare WPRadius = 1;
#declare WPCurvRadius = 1.5;
intersection
{ #declare IPH = sqrt(pow(WPCurvRadius,2)-pow(WPRadius,2));
  torus { WPRadius, WPCurvRadius translate -y*IPH}
  cylinder { 0, y*(WPCurvRadius-IPH), WPRadius }
  
  pigment
  { spiral1 1 color_map { [0 rgb <.5,.75,1>][1 rgb <0,.5,1>] }
    turbulence .1
    rotate x*90
    scale <.1,1,.1>
  }
  normal
  { spiral1 1 .15 slope_map
    { [0 <0,0>][.25 <.5,1>][.5 <1,0>][.75 <.5,-1>][1 <0,0>] }
    rotate x*90
    scale <.2,1,.2>
  }
  finish { specular .5 reflection .3 }
}
----------8<----------8<----------8<----------8<----------8<----------

-- 
#macro N(D,I)#if(I<6)cylinder{M()#local D[I]=div(D[I],104);M().5,2pigment{
rgb M()}}N(D,(D[I]>99?I:I+1))#end#end#macro M()<mod(D[I],13)-6,mod(div(D[I
],13),8)-3,10>#end blob{N(array[6]{11117333955,
7382340,3358,3900569407,970,4254934330},0)}//                     - Warp -

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