### Description
This is a demonstration of how to construct and display geometric objects using the classes derived from vtkCell3D. For each object we specify the points and cell Ids. 

From this we create an unstructured grid. In some cases a vtkCellArray is used and the result is added to the unstructured grid, see: *MakePolyhedron()* and *MakeTetrahedron()*.

Also demonstrated is the use of vectors to hold the unstructured grids, mappers, actors and renderers.

The resultant objects are then displayed in a grid.
