Hi Brian, nice hat maker! :)

> Noticed that a revolve on the x-axis only does one
> section. Same with sine function.

If the profile intersects the revolve axis, the revolve command cuts the profile by the axis and picks the largest piece to actually revolve.

That's to help avoid making a messy self-intersecting surface result (where the surface crosses through itself) in cases where you might have drawn the profile curve with a little bit sticking past the revolve axis.

- Michael