Returns point of intersection between the circle described by circle-center,
circle-radius, and circle-plane-normal, and the sphere described by sphere-center
and sphere-radius. Iff the circle and sphere do not intersect at all, NIL is returned.
- arguments:
- circle-center 3D Point
- circle-radius Number
- circle-plane-normal 3D Vector
- sphere-center 3D Point
- sphere-radius Number
- positive-angle? Boolean
- Controls which of two intersection points is returned
- keyword arguments:
- tolerance Controls how close the entities must come to touching to be
considered as intersecting, Default Value: *ZERO-EPSILON*
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