In each modle 
   p  represents a vertex list, polygon list data set

      In this dataset, the first three numbers represent the number of
      verticies, polygons, and edges.

      Next is a list of the verticies.
      Finally a list of the polygons, number of sides and list of points.

   g  represents a grid dataset
    
       In this dataset, the first two numbers are the dimensions of the grid
       followed by the list of points.


model1  A space shuttle model.
model2  Another space shuttle model.
model3  A cube.
model4  A widget (from our book).
model5  A torus.
model6  A very simple grid.
model7  A somewhat bigger grid.
model8  A saddle point.