Hi,
I am trying to get uv coordinates and color of a point I found using the
LineSegmentIntersector. My problem is that the found intersection has no
indexList so I cannot use the code used in osgmovie.
This short code example should boil down to the point:
Code:
osg::Box* b = new osg::Box( osg::Vec3d(0,0,0), 1.0f);
osg::Geode* g = new osg::Geode();
g->addDrawable( new osg::ShapeDrawable( b ) );
osg::ref_ptr< osgUtil::LineSegmentIntersector> lineSeg
= new osgUtil::LineSegmentIntersector(osg::Vec3d(0,-2,0), osg::Vec3d(0,0,0));
osgUtil::IntersectionVisitor
findIntersections(lineSeg.get());
g->accept(findIntersections);
osgUtil::LineSegmentIntersector::Intersection currHit =
lineSeg->getFirstIntersection();
osg::Vec3d intersecPnt =
currHit.getWorldIntersectPoint();
int vecArraySize = currHit.indexList.size();
int vecRatioSize = currHit.ratioList.size();
intersecPnt is correctly found, but vecArraySize and vecRatioSize is zero.
I read through some layers of osg code and it seems my proble is the
treatVertexDataAsTemporary variable. It prevents at the end of
TriangleIntersector::operator () (part of LineSegmentIntersectorUtils in
linesegmentintersector.cpp) that the found three vertices used to compute the
intersection are inserted into the result as they are "temporary".
How do I get the correct uv coordinates in such a situation or how do I force
the inclusion of the needed vertices?
Cheers,
Oliver
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=35293#35293
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