[osg-submissions] Enhanced Intersection Results for PolytopeIntersector

[Peter Hrenka]

Hi Robert,

Due to popular demand I would like to submit this
enhanced version of PolytopeIntersector.


New features of PolytopeIntersector :

* Dimension mask: The user may specify the dimensions of the
    primitives to be tested. Checking polytope-triangle and
    polytope-quad intersections is rather slow so this can
    be turned off.
* Reference plane: The resulting intersections are sorted
    by the distance to this plane.

New memebers of PolytopeIntersector::Intersection :

* distance: Distance of localIntersectionPoint to the reference plane
* maxDistance: Maximum distance of all intersectionPoints to the
    reference plane.
* intersectionPoints: The points intersecting the planes of the polytope
    or points completely inside the polytope.
* localIntersectionPoint: arithmetic mean of all intersection points
* primitiveIndex: Index of the primitive that intersected


I added some more output to the example osgkeyboardmouse.


Cheers

Peter

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