[python] Re: More virtual pivot thoughts (tire scrub, office chair)
- From: Michael Rienstra <ageless@xxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Wed, 22 Sep 2004 09:00:51 -0700
Everyone,
Hope nobody minds all of the emails, I just had a fun idea for
visualizing the wheel scrub issue.
If you are sitting in an office chair (a chair that can spin around),
try this:
Put both feet on the ground.
You are a tadpole tricycle (two wheels in the front), and your feet are
the front wheels. The chair is the real wheel.
Now try to move one foot sideways. It will slide along the ground, and
your other foot and the chair will stay still. This is kind of like
what happens with a trike if the steering is not designed properly.
If you then lift one of your feet, you become a Python or a Vython!
Try to move your foot sideways again, and your chair will rotate.
If you then imagine that your front foot is the rear wheel, and your
chair is the front wheel, you can imagine how the "rear-wheel steer"
Vython that Laurent is building will work. The rear wheel tries to move
in a circular arc around the front wheel, but instead it stays still
and everything else rotates around the front wheel!
Michael
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