[geomview-users] Display convex 3D polyhedron 6-colored using qhull+geomview

[<he...@st...>]

For my long term objective (factoring a RSA number bigger than RSA-250, 
which took 2700 CPU core years)
https://stamm-wilbrandt.de/en/#long-term_objective

I needed to view 3D polyhedron of points n=x²+y²+z² with n=pq semiprime 
and p,q both =1 (mod 4).
First I used jscad.app for that, but for bigger n I wanted to use qhull 
and geomview.

 From my old planar_graph_playground repo I took planar graph 6-coloring,
determination of dual graph and then colored the polyhedron faces with 
at most 6 colors.

Since both face colors for an edge are distinct, I made geomview not 
display edges. Now for much bigger n I can view at the polyhedron.

All 6-coloring qhull work and screenshots can be found here:
https://github.com/Hermann-SW/RSA_numbers_factored/tree/main/qhull

Besides display of 6-colored polyhedron, statistical output is generated 
as well:

$ ./pq6col 13 277
n=3601: 480 vertices, 1128 edges, 650 faces (6 colors)

face lengths
408×3
210×4
32×6


Regards,

Hermann Stamm Wilbrandt.