Hi Robert,
Thanks for your detailed answer, it helps a lot.
>Hi LiTing,
>Have a look at the osgpick and osgkeyboardmouse examples, they'll show
>you how to set up picking in different ways.
>Also to understand transformation between window coordinates and world
>coordinates it'd be worth you reading OpenGL docs on gluUnproject and
>gluProject.
>The basic concept of the transformation involved are:
>To go from world to window coords:
> Matrix VPW = camera->getViewMatrix() *
> camera->getProjectionMatrix() *
> camera->getViewport()->computeWindowMatrix();
>Vec3 window = world * VPW;
>To go from window into to world:
>Matrix inverseVPW;
>inverseVPW.invert(VPW);
>Vec3d world = window * inverseVPW;
>Robert.
>On 7/13/07, litingbaotou <[EMAIL PROTECTED]> wrote:
>
>
> Hi,
>
> I use OSG 2.0 now, and it's much better than other versions. But I meet
> a problem when I want to unproject my clicked point from screen to the world
> scene.
>
> In OSG 1.0, I use osgUtil::SceneView::getViewport() to get
> current viewport matrix and use
> osgUtil::SceneView::projectWindowXYIntoObject() to get the
>
> near point and far point, then I can use them to get a linesegment to
> intersect with any plane.
>
> In OSG 2.0 I use osgViewer::Viewer, I can use
> osgViewer::Viewer::getCamre()->getViewport() to get current
> viewport matrix, but I don't know how to use
>
> some unproject function like projectWindowXYIntoObject().
>
> I find osgViewer::Viewer has _sceneViews as a osgUtil::SceneView member,
> but I can not find and "getSceneView()" method in osgViewer::Viewer.
>
> Can someone give me a hand?
>
>
> Thanks.
>
> --LiTing.
>
> ________________________________
>
> litingbaotou
> 2007-07-13
> _______________________________________________
> osg-users mailing list
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>
litingbaotou
2007-07-16
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