FUNCTION ProjectPointOnPlane : LREAL
This function will project a point 
onto a plane in direction of the normal vector. The return is the distance of the point 
to the plane.
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InOut:
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Scope
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Name
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Type
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Comment
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Return
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ProjectPointOnPlane
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LREAL
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Input
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pplane
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POINTER TO Plane_H
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Pointer on plane description
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pvOrig
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POINTER TO VECTOR3D
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Pointer on point  to be projected
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pvProj
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POINTER TO VECTOR3D
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Pointer on projection of  onto plane
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