This version lacks a definition of the global array u.
It doesn't run just now (July 2006).

This version has turns on 2 material mode.
That seems to work.
It also has PowerPC timing built in.
Key p prints cumulated times.


The following sequence of interactions seems to lead to a bad result:
option down
mouse button down
move cursor (a) (useful effects happen)
option up
move cursor (b) (same effects continue--good, I think)
mouse button up (Leads to bad effects--perhaps related to
    effects of a+b motions without option button.)
