Function: INTER-LINE-SPHERE

Function: Inter-Line-Sphere

INTER-LINE-SPHERE 3d point or nil
Returns one point of intersection between line described by point p-line and direction-vector u-line, and sphere described by center and radius. Iff the line and sphere do not intersect at all, NIL is returned.
arguments:
p-line 3D Point
Any point on the line
u-line 3D Vector
Direction of the line
center 3D Point
Center of the sphere
radius Number
The radius of the sphere
side-vector 3D Vector
Controls which of two possible intersection points is returned

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