add_geometry
   add_geometry(name, geometry, plugin, node) 
   
   Add a vtkPolyData object to the SV Data Manager. 
   
   The geometry is added to the SV Data Manger under the given plugin and  
   node, and is displayed in the SV graphics window.
   
   Args: 
     name (str): The name of the data node. 
     geometry (vtkPolyData object): The vtkPolyData to add to the SV Data  
        Manager.                                                           
     plugin (str): The name of the plugin the data node resides under.     
        Valid names: Image, Mesh, Model, Path, or Segmentation.            
     node (str): The date node name to add the geomerty to.                

add_mesh
   add_mesh(name, mesh, model)  
   
   Add a mesh to the SV Data Manager Meshes node. 
   
   Args: 
     name (str): The name of the mesh data node.                           
     mesh (vtkUnstructuredGrid object): The vtkUnstructuredGrid object.    
     model (str): The name of the SV Data Manager Models node associated   
        with the mesh.                                                     

add_model
   add_model(name, model) 
   
   Add a model to the SV Data Manager Models node.                            
   
   Args: 
     name (str): The name for the model data node.                            
     model (sv.modeling.Modeler): The model object representing a solid model.

add_path
   add_path(name, path)  
   
   Add a path to the SV Data Manager Paths node. 
   
   Args: 
     name (str): The name of the path data node.                           
     path (sv.path.Path object): The path object to create the path node from. 

add_segmentation
   add_segmentation(name, path, segmentations) 
   
   Add a segmentation to the SV Data Manager Segmentations node. 
   
   Args: 
     name (str): The name of the segmentations data node to add. 
     path (str): The name of the path data node used by the segmentation. 
     segmentations (list[Segmentation]): The list of segmentation objects 
        defined for a vessel segmentation.                                

get_mesh
   get_mesh(name) 
   
   Get a mesh from the SV Data Manager Meshes node. 
   
   Args: 
     name (str): The mesh node name. 
   
   Returns a vtkUnstructuredGrid object.  

get_model
   get_model(name) 
   
   Get a model from the SV Data Manager Models node. 
   
   The model returned is an sv.modeling modeler object of the same type used  
   used to create the model in SimVascular. For example, getting a PolyData   
   model returns an sv.modeling.PolyData object.                              
   
   Args: 
     name (str): The model node name. 
   
   Returns a model object.                                                    

get_path
   get_path(name) 
   
   Get a path from the SV Data Manager Paths node. 
   
   Args: 
     name (str): The name of the path data node. 
   
   Returns an sv.path.Path object.  

get_segmentations
   get_segmentations(name) 
   
   Get the segmentations from an SV Data Manager Segmentations node.          
   
   Args: 
     name (str): The segmentation node name. 
   
   Returns a list of sv.segmentation.Segmentation objects.