I'm not 100% sure, but I think I remember we had an odd problem with our qt osg
integration where we had to reverse the 'y' direction of the event, so that may
be worth a try.
Also, I don't think it's unusual to get two intersections for one geometry if
it's a closed convex shape because the ray will intersect two triangles, and
you would typically ignore the triangle whose normal is facing away from you.
Chris Denham.
Hartmut Leister wrote:
> Hello all,
>
> I got a problem with osgUtil::computeIntersections(). I wanted to include it
> in my application (which is nested into the osgviewerQT example). I took the
> code for picking from the osgpick example.
> However, when I click on my view, there's the following possibilities
> - the picked node/drawable is correct, but listed twice
> - no intersection is computed, although I clicked on a drawable
> - an intersection is computed, although i clicked into empty space
>
> I can't explain, what I could be doing wrong. Perhaps it's that event comes
> from QMouseEvent and has another coordinate system than osgviewer?
>
> Any hints where to go from here?
>
> Best wishes
> Hartmut
>
>
> Code:
>
> void ViewerQT::mouseReleaseEvent( QMouseEvent* event )
> {
> // default mouse control
> AdapterWidget::mouseReleaseEvent(event);
>
> // continue with picking
> osgUtil::LineSegmentIntersector::Intersections intersections;
> float x = event->x();
> float y = event->y();
>
> std::cout << "(" << x << "," << y << ")";
> std::cout << std::endl;
>
> if (computeIntersections(x,y,intersections))
> {
> for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
> intersections.begin();
> hitr != intersections.end();
> ++hitr)
> {
> if (!hitr->nodePath.empty() && !(hitr->nodePath.back()->getName().empty()))
> {
> // the geodes are identified by name.
> std::cout << "Object \""
> << hitr->nodePath.back()->getName()
> << "\""
> << std::endl;
> }
> else if (hitr->drawable.valid())
> {
> std::cout << "Object \""
> << hitr->drawable->getName()
> << "\""
> << std::endl;
> }
> }
> }
>
> --
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>
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