Infinite cylinder-ray intersections
Infinite cylinder along y of radius r axis has equation
x2 + z2 - r2 = 0.
The equation for a more general cylinder of radius r oriented along
a line pa + vat:
(q - pa - (va,q - pa)va)2 - r2 = 0
where q = (x,y,z) is a point on the
cylinder.
r
pa
va
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