[osg-users] computeIntersections for Slave camera often return false

[Ran Chao]

Hi,

I got a point (x,y) in a Slave camera image, and i want to know it's position in world coords, so i use computeIntersections(), my code: 

        osgUtil::LineSegmentIntersector::Intersections intersections; 
        if( !view->computeIntersections(camera.get(), osgUtil::Intersector::WINDOW, x, y, intersections) ) 
                return false; 

        const osgUtil::LineSegmentIntersector::Intersection& hit = *(intersections.begin()); 

        out_intersect_point = hit.getWorldIntersectPoint(); 

But computeIntersections() often return false, what's wrong?

Thank you!

Cheers,
Ran

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