求助setHomePosition后获取视锥体错误的问题

267270476

在CameraManipulator::setHomePosition后，通过view::home切换视角，然后获取视锥体：

1. osg::Matrix viewMatrix = aCamera->getViewMatrix();
   
2.     osg::Matrix projectionMatrix = aCamera->getProjectionMatrix();
   
3.     osg::Matrix mvp = viewMatrix * projectionMatrix;
   
4.     osg::Polytope polytope;
   
5.     polytope.setToUnitFrustum();
   
6.     polytope.transformProvidingInverse(mvp);
   
7. }

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发现视锥体比真实的视锥体小，求助怎么解决