Trajectory of toroidal rotation : poloidal revolution = 7 : 6 on golden ratio horn spheroid
x = 0.618·r·(1 - cosφ)·cos(7φ/6)
y = 0.618·r·(1 - cosφ)· sin(7φ/6)
z = r · sinφ
all points P(x,y,z) are widened ±7.5° on latitude
still image out of 24 frames, used for
animation
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