Create a truncated icosahedron with gnuplot or metapost

[Matthew Seaman]

On 27/08/2017 14:51, Antonio Olivares wrote:
> Dear freebsd-users,
> 
> In looking for a way to draw a royalty free soccer ball with open source
> software like gnuplot or metapost, I have found a promising page
> 
> http://math.lbl.gov/voro++/examples/platonic/
> 
> I have to run the programs there, but the problem becomes how can we shade
> the pentagons in black.  We can create a sphere in gnuplot, but to change
> the faces into pentagons and hexagons?
> 
> http://soukoreff.com/gnuplot/
> 
> I have found a nice page that uses java to draw a soccerball
> 
> http://www.hoist-point.com/soccerball.htm
> 
> If somehow the github code can be converted to metapost?, or generated to
> get the points and then get the shading correctly.  I hope someone can
> help.  I have also looked into metapost extensions by Anthony Phan m3D
> package
> 
> http://www-math.univ-poitiers.fr/~phan/m3Dplain.html
> 
> And unfortunately I do not know enough of metapost coding, other than
> copying examples and run them on my machines.  Is there a nice idiot proof
> way of drawing a soccerball or a truncated icosahedron with gnuplot or
> metapost?  If anyone can help/advice/suggest please share your thoughts.

Is it specifically a truncated icosahedron you want, or a soccer ball?
Because there's this:

https://en.wikipedia.org/wiki/File:Soccerball.svg

which is freely available under a creative commons license.  You should
be able to use an application like Inkscape (https://inkscape.org/en/)
to manipulate that image.

There's many other examples of soccerballs available, or indeed
truncated icosahedrons.  Just google for 'soccer ball clipart svg'

	Cheers,

	Matthew

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