Woody wrote:
  > Thanks.
> 
> I tried using the solids Paul Bourke posted at
> http://local.wasp.uwa.edu.au/~pbourke/geometry/platonic/
> 
> But I can't seem to get the proportions or position right.
> 

No prob.  On cursory examination of those I couldn't work out whether 
the edge length or radius is uniform, but I didn't do any calculating. 
I cheated and just made the shapes for mine in Wings, mainly because it 
was a quicker way to get the type of hollowing I wanted, and copied the 
edge length of each into the include file for the calculations.  The 
spheres/shapes having non-zero thick walls made things more complicated. 
  However, something still must be wrong, or they wouldn't protrude like 
that.

-- 
// The Mildly Infamous Blue Herring
#include"functions.inc"isosurface{function{-f_strophoid(x/2-.45,y,
z*3,1,1.2,1,1.5)-.05}contained_by{box{<-2.1,-1,-1/3>,<1.4,1,1/3>}}
max_gradient 12inverse hollow pigment{rgbf 1}interior{media{samples
8 emission<3,80,150>/255density{crackle metric 1color_map{[0rgb 6]
[.03rgb 0][1rgb 0]}scale<1,2,1>warp{turbulence<.5,.75,.5>}scale 1/
3}}}translate z*3}

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