fun with spheres...


I'm attempting to render points as spheres.  But i'm having problems w/
rendering in POLYGON_FILL mode w/i visad.   My intention is to have multiple
solid, shaded spheres displayed of consistent size, but I get spotty fill
with inconsistent size...  Since a picture is worth a thousand words i'll
put links to pictures which best describe my situation.  The second pic. is
of the first zoomed into a sphere (which includes a shaded come...???)  What
am I missing?

TIA for any help offered...