[osg-users] Mouse position to object space

[Florian GOLESTIN]

Hi Hakan,

If you want to simply drag (or do other transformation to) an object you can use the Dragger from the osgManipulator pluggin:


Code:

osgManipulator::TranslateAxisDragger




Otherwise you need to project the mouse to the world space.
If I recall correctly:



Code:

    osgViewer::View *view = dynamic_cast<osgViewer::View *>(&actionAdapter);
    const osg::Camera *camera = view->getCamera();

    const osg::Matrixd viewMatrix = camera->getViewMatrix();
    const osg::Matrix projectionMatrix = camera->getProjectionMatrix();
    osg::Matrix inverseCameraMatrix;
    inverseCameraMatrix.invert(viewMatrix * projectionMatrix);
    osg::Vec3 worldPosition = osg::Vec3(ea.getXnormalized(), ea.getYnormalized(), 0.0f) *
                    inverseCameraMatrix;




The z value of the Vec3 is the Near Plane, set it to 1.0 to have the Far Plane projection.

Best,
Florian

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