SW2009-Equation Driven Curves

I have been playing with these. The accuracy seems to be OK.

Their behaviour seems to be a bit glitchy. The PM is supposed to go red
if there is something wrong with the equation but it doesn't always seem
to do so. In some cases closing the PM and reopening it will reveal that
a previous equation is still being evaluated because it didn't like a
new version.

Some types of equations like sin(1/X) do not behave very well close in
to the origin. It is hard to pick the X1 value.

The other issue I have with it is that there is no preview window to
show the equation results. Since these curves are rendered in absolute
coordinates it is sometimes hard to see what the result is.

As far as enhancements I think that this sketch tool curve should be
made more capable by allowing a 3d curve to be defined as well as a
fully parametric surface.

I would also like to see the ability to drive the curve with parametric
distance along an existing curve.

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Looks like an enhancement with a small to non-existent audience.

Mr. Pi