[pstricks] need simple code for pst-gr3d package

[Doug Mounce]

Hi all,
I successfully ran a sample source from the tug examples for PSTricks 
Three Dimensional Graphics using the pst-gr3d package.  The example is 
too complex for me to conveniently unravel.

Does anyone have simple sample code for a \PstGridThreeD(1,1,1)?

I can't quite get how to configure the preamble, or how that relates 
after the document begins.  If I start small, maybe I might be able to 
understand, regards,

Doug Mounce
http://staff.washington.edu/mounce/