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This is a spherical function 'designed' using Functy (3D graph rendering) and intended to test out full colour sandstone. The object can be described entirely using the following functions.
Radius = (0.01*((1+cos(12*(a+(p*2)))*sin(p))+(1+cos(3*a+p))))
(R, G, B) = ((1+cos(p*2))/2, 0.3, cos(12*(a+(p*2)))>0.9)
The result is surprisingly effective, and although the blades get very thin at the edges, the printer has dealt with them wonderfully. It feels brittle, but not dangerously so. The colours are also much more vivid than I was expecting. Great!
Alas, it has no practical value that I can think of. Pushing mathematical functions into reality feels like an end in itself.