I guess I did this for the benefit of all of us… I suggest we put some 3D math site links for any newbies (hello yours truly 
) so they can find out the stuff or people trying to answer questions can reference to one of the 3D math sites if possible.
Here’s mine:
http://fourier.math.temple.edu/cgi-bin/manager
it’s a calc site that talks about dot products (shadow matrices people!!) and other nifty stuff.
cwhite40