quad:Normals() specifies what kind of normals are desired for quadrics rendered with quad.
The legal values are as follows:
#GLU_NONE-
No normals are generated.
#GLU_FLAT-
One normal is generated for every facet of a quadric.
#GLU_SMOOTH-
One normal is generated for every vertex of a quadric. This is the initial value.
Please consult an OpenGL reference manual for more information.