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Does anyone have a working version of Understanding 2D Shearing demonstration?

At the Demonstration project there is an excellent series on Affine Transforms by Roger Germundsson. One of them is "Understanding 2D Shearing" and may be found here

Sadly, it does not evaluate error-free. It appears to be missing definitions for TangentPlane and NormalPlane functions. If anyone has those missing pieces of the code, I would appreciate a copy.

Thanks
POSTED BY: Roger J Brown
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I don't reproduce your errors. When I go to the page you linked, hit the "Copy to clipboard" button, and then paste it into a notebook it works right away.
POSTED BY: Jason Biggs

That does work. Thanks. I was using the "Source->Download to desktop" method. Still a mystery is how it works with TangentPlane and NormalPlane not defined. If you know why, I am curious.
POSTED BY: Roger J Brown
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