Hi,
I have a problem with picking a dragger when an AutoTransform is active.
In fact, the problem occurs with any LineSegmentIntersection with
objects inside an AutoTransform. I can resume my case to using the
osgManipulator::TrackballDragger with useAutoTransform=true.
Basically, I create a TrackballDragger and add it as a child of the root
node (just to test), then run an intersection test when I click (as in
the osgManipulator example):
view->computeIntersections(ea.getX(),ea.getY(),intersections)
If I create the Trackball with useAutoTransform=false, everything works
fine, it gets intersected and highlights. But if I create the trackball
with useAutoTransform=true, it never intersects. In fact,
IntersectionVisitor::apply(osg::Transform& transform) is never called.
The trackball displays correctly.
I've tested with a really basic application (based on the osgManipulator
example) and it works fine:
int main()
{
osgViewer::Viewer viewer;
osg::ref_ptr<osg::Group> loadedModel = new osg::Group;
osg::ref_ptr<osgManipulator::TrackballDragger> dragger = new
osgManipulator::TrackballDragger(true);
dragger->setupDefaultGeometry();
loadedModel->addChild(dragger);
viewer.setSceneData(loadedModel.get());
viewer.addEventHandler(new PickModeHandler()); // From
osgmanipulator example.
return viewer.run();
}
My application does about the same thing (except being more complex of
course). So obviously I'm missing something in my application, or doing
something wrong. And I can't catch what it is.
Does somebody have a clue about what can make an intersection test not
work with an auto-transformed object? I understand that it's hard to
tell without seeing the specific application's code, but to me the
application is quite straightforward.
I'm currently using OSG version 2.9.2.
regards,
Vincent Gadoury
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