osg 屏幕坐标和世界坐标转换

//屏幕-〉世界：
osgUtil::SceneView::projectWindowIntoObject
//或者自己运算
Matrix VPW = camera->getViewMatrix() *
camera->getProjectionMatrix() *
camera->getViewport()->computeWindowMatrix();
Matrix inverseVPW = Matrix::inverse(VPW);
Vec3d world = window * inverseVPW;

//世界-〉屏幕：
osgUtil::SceneView::projectObjectIntoWindow
//或者自己运算
Matrix VPW = camera->getViewMatrix() *
camera->getProjectionMatrix() *
camera->getViewport()->computeWindowMatrix();
Vec3 window = world * VPW;