/**
 \defgroup ITKSpatialFunction Module ITKSpatialFunction 
 This module contains filters related to the use of spatial
functions. The spatial function classes implement the concept of defining
regions of space, typically as masks. You will find here the filter that can
take a spatial function, and rasterize it into the grid of an image. 
 \par Dependencies:
 \li \ref ITKImageFilterBase 
 \li \ref ITKImageFunction 
 \dot 
 graph "ITKSpatialFunction" { 
 "ITKSpatialFunction" -- "ITKImageFilterBase"; 
 "ITKSpatialFunction" -- "ITKImageFunction"; 
 } 
 \enddot 
 */

