Hi Ben,
In my engine, I got a method that takes a View and an optional NodePath. Notes:
- I created an invisible plane so that I can test against that plane.
- pointerX and pointerY are class members (you may refactor so that it suits
your needs).
- Here my method assumes there is at most one intersection (see the ASSERT()).
- setPickPosition() is a method that stores the result (= the
intersection/pick position).
void computePickPos(osgViewer::View & view, osg::NodePath * pPickNodePath =
NULL) {
if (pPickNodePath && pPickNodePath->empty()) return;
osgUtil::LineSegmentIntersector::Intersections intersections;
bool intersected;
if (pPickNodePath) intersected = view.computeIntersections(pointerX,
pointerY, *pPickNodePath, intersections);
else intersected = view.computeIntersections(pointerX, pointerY,
intersections);
if (intersected)
{
ASSERT(intersections.size() <= 1);
if (intersections.size()>0)
setPickPosition(intersections.begin()->getWorldIntersectPoint());
}
}
Hope it helps.
Sukender
PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/
Le Mon, 09 Mar 2009 20:31:55 +0100, Ben Axelrod <baxel...@coroware.com> a écrit:
> I have been using osgUtil::PickVisitor for a while now to pick objects in my
> tree under the mouse. But now I need to cast a ray into the scene under the
> mouse and manually intersect it with an imaginary plane. Is there some
> helper function to do this mouse ray cast for me? Specifically, something
> that would take as input 2 ints for the position of the mouse, and maybe the
> camera or projection and view matrices, then output a vector?
>
> Thanks,
> -Ben
>
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