file: jobg.t package: muf status: alpha
Basic raytracing primitive: Given a ray at origin O
with direction vector D and a sphere given by center
S (all length-three vectors) and radius r,
this function returns nil,largevalue if there was no intersection,
else the point of intersection P and the parametric ray
coordinate of the intersection, a scalar s. (One often
uses s to check which of several candidate hits is in
fact first on the ray.)
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