[osg-submissions] Add LineSegmentIntersector::setStart() and setEnd() methods

[Jean-Sébastien Guay]

Hello Robert,

I was recently in a situation where I had to do lots of intersection tests
(a couple hundred at least per vertex in a model), and it turned out,  
for some reason, that the LineSegmentIntersector construction and  
destruction were eating some small but significant amount of time. So  
I wanted to create a static LineSegmentIntersector and just reset() it  
and set its start and end points each time the intersection function  
was called. But the class had no setters for the start and end.

This adds osgUtil::LineSegmentIntersector::setStart(osg::Vec3d) and  
setEnd(osg::Vec3d).

J-S
-- 
______________________________________________________
Jean-Sebastien Guay     jean-sebastien.guay at polymtl.ca
                         http://whitestar02.webhop.org/

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