### Description
This example can be run in three ways:

1.  *BooleanOperationPolyDataFilter* - Computes the intersection of two spheres

2.  *BooleanOperationPolyDataFilter* **intersection|difference|union** - Computes the intersection(difference or union) of two spheres

3.  *BooleanOperationPolyDataFilter* **input1.vtk intersection|difference|union input2.vtk** - Computes the intersection(difference or union) of two polydata's
