void setRenderer(vtkRenderer* rend);
void addVolume(vtkImageData* img, std::string dataname);
void addSurface1(vtkImageData* img, std::string dataname);
void addSurface2(vtkImageData* img, std::string dataname);
void addSurface3(vtkImageData* img, std::string dataname);
void setRenderer(vtkRenderer* rend);
void addVolume(vtkImageData* img, std::string dataname);
void addSurface1(vtkImageData* img, std::string dataname);
void addSurface2(vtkImageData* img, std::string dataname);
void addSurface3(vtkImageData* img, std::string dataname);