Hi Renan,
The intersections data structure has a list of hit objects, and these
will include the NodePath down to the hit object and also the Drawable
leaf.
Robert.
On Dec 18, 2007 3:43 AM, Renan Mendes <[EMAIL PROTECTED]> wrote:
> Hi, everyone.
>
> I have a class called Point that is derived from MatrixTransform. An
> instance of this class always has a Geode child, which has a Drawable, which
> is a ShapeDrawable. For better understanding of things, I'll use a simple
> shape for a drawable, let's say a sphere.
> Let's suppose I have an instance of my Point class, which is attached
> to the viewer, being displayed on the screen
>
> I use a PickHandler class that is as follows:
>
> bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,
> osgGA::GUIActionAdapter& aa)
> {
> osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>( &aa );
> osgUtil::LineSegmentIntersector::Intersections intersections;
>
>
> if(!viewer)
> { return false; }
>
> switch( ea.getEventType())
> {
> case(osgGA::GUIEventAdapter::PUSH):
> {
> if(Intersecao(viewer, ea))
> { ... } // I'LL TALK ABOUT THESE BRACKETS FURTHER AHEAD
> }
> }
> }
>
> bool PickHandler::Intersecao(osgViewer::Viewer* viewer, const
> osgGA::GUIEventAdapter& ea,
>
> osg::Util::LineSegmentIntersector::Intersections intersections)
> {
> return
> (viewer->computeIntersections(ea.getX(),ea.getY(),intersections));
> }
>
>
> So, I guess my question is: what do I write inside those brackets
> that I marked above to traverse till the drawable and change its color? What
> I really need here is some language learning, not only theoretical, OK? In
> other words: if you could write a little bit of source code to clarify what
> you are saying, that'd be great.
>
>
>
> Thanks, everyone. If you manage to explain
> how it's done to the newbie you're talking to, I'd be grateful.
>
> Renan M Z Mendes
>
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>
>
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