#NEWLINE# def volume( self , xfmname , projection = 'nearest' , **kwargs ) : #NEWLINE# #INDENT# import warnings #NEWLINE# warnings . warn ( 'Inverse mapping cannot be accurate' ) #NEWLINE# from . import utils #NEWLINE# mapper = utils . get_mapper ( self . subject , xfmname , projection ) #NEWLINE# return mapper . backwards ( self , ** kwargs )