From Newsgroup: sci.math
These can be hard to get, but I have a special and rather quick way to
do it. As we are integrating a field line along the graident, or
geodesics, we simply plot two points ahead. We now have a triangle in
the space, and we take its surface normal. That is basically the
equipotential at that triangle.
An example:
https://www.facebook.com/reel/1145436857057561
Another:
https://www.facebook.com/share/p/1BX3e3JtwS/
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