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
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