vtkSmartPointer<vtkImageMapToWindowLevelColors> mFusionMapper;
vtkSmartPointer<vtkImageActor> mFusionActor;
vtkSmartPointer<vtkCornerAnnotation> ca;
vtkSmartPointer<vtkImageMapToWindowLevelColors> mFusionMapper;
vtkSmartPointer<vtkImageActor> mFusionActor;
vtkSmartPointer<vtkCornerAnnotation> ca;
vtkSmartPointer<vtkActor> mLandActor;
vtkSmartPointer<vtkBox> mClipBox;
vtkSmartPointer<vtkScalarBarActor> legend;
vtkSmartPointer<vtkActor> mLandActor;
vtkSmartPointer<vtkBox> mClipBox;
vtkSmartPointer<vtkScalarBarActor> legend;
void ComputeVFDisplayedExtent(int x1,int x2,int y1,int y2,int z1,int z2,int extent[6]);
void ComputeOverlayDisplayedExtent(int x1,int x2,int y1,int y2,int z1,int z2,int overExtent[6]);
void ComputeFusionDisplayedExtent(int x1,int x2,int y1,int y2,int z1,int z2,int overExtent[6]);
void ComputeVFDisplayedExtent(int x1,int x2,int y1,int y2,int z1,int z2,int extent[6]);
void ComputeOverlayDisplayedExtent(int x1,int x2,int y1,int y2,int z1,int z2,int overExtent[6]);
void ComputeFusionDisplayedExtent(int x1,int x2,int y1,int y2,int z1,int z2,int overExtent[6]);