Intersection Functions

Intersection functions use the following conventions:

• Plane: an infinite 3D plane
• Ray: point and direction, possibly a length
• Gravray: point with direction in the -z only, possibly a length
• AABB: axis aligned bounding box
• Tri: triangle

Intersection functions return:

• REJECT No intersection.
• INTERSECT Intersected. Usually the point of intersection is written to a structure.
• POSITIVE, A comparison was positive.
• NEGATIVE, A Comparison was negative.

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