Thanks to Dave Scherer for explaining to me how to fix two problems with
frames. Recall that you can put objects in frames and then move or rotate
the frame, with all of the frame's objects moving or rotating together. You
can even put multiobject frames inside other frames.
In some cases frames within frames didn't display correctly. And in no case
could you "pick" an object in a rotated frame -- you had to point the mouse
where the object would have been if the frame hadn't been rotated.
At http://vpython.org there is a new version for Windows with these
problems fixed. If you have previously installed VPython for Python 2.2 on
Windows, you only need to download the DLL and unzip it into the Python 2.2
directory (it will end up in Python22\DLLs).
Bruce Sherwood
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