I forgot to mention two new vector functions that Jonathan Brandmeyer
introduced into the new Boost-based VPython:
There are two new functions to use with vectors: vec1.diff_angle(vec2)
returns the angle (in radians) between vectors vec1 and vec2. You can
convert a vector to a tuple by tuple(vec1) or by the much faster option
vec1.as_tuple().
Bruce
P.S. The "Recent developments" section of http://vpython.org contains a
log of changes, so you can always look there to see what's new.
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