Hi Tom, Yes, I should have probbaly tried outputting values to the console a little earlier. It appears there is a bug in VS 2005 while setting a watch on variables in member functions in classes.
So I have managed to narrow down my problem to the following lines of code: xPos and yPos are legitimate value. However backhoeContactPoint.x and .y show 0 as output. I also noted that the Intersection backhoeIntersection has its member matrixd showing: error unable to access inavlid memory location. But this method was working for me when I was updating position through keyboard input. Code: //PROBLEM STARTS FROM HERE AS CONSOLE OUTPUT SHOWS VALUE 0: osgUtil::LineSegmentIntersector* backhoeLocationSegment = new osgUtil::LineSegmentIntersector( osg::Vec3d(xPos, yPos, 99999), osg::Vec3d(xPos, yPos, -99999)); osgUtil::IntersectionVisitor findBackhoeElevationVisitor; findBackhoeElevationVisitor.setIntersector(backhoeLocationSegment); surface->accept(findBackhoeElevationVisitor); osgUtil::LineSegmentIntersector::Intersection backhoeIntersection = backhoeLocationSegment->getFirstIntersection(); osg::Vec3d backhoeContactPoint = backhoeIntersection.getWorldIntersectPoint(); Console::WriteLine("backhoeContactPoint.x: {0}", backhoeContactPoint.x()); Console::WriteLine("backhoeContactPoint.y: {0}", backhoeContactPoint.y()); return backhoeContactPoint; What can I infer from this ? Thanks, Sanat ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30214#30214 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org