Hi Colin,

> So for example is it preferable to use a Base Surface made
> from Sweep more than a Loft or Extrude surface??

Are you talking about the base surface here, or the target surface?

For the base surface pretty much the easiest thing is one of the plane drawing tools under Draw solid > Plane.

For the target surface it really depends on what kind of shape you want, since those various tools make different kinds of shapes so it's not like you can always swap one for the other. But yes, as far as UV layout goes it is possible for different construction methods to put the UVs in different directions, I'm not sure of the details about that for each one right now. In the next beta it won't really make a difference though anyway.

Some commands may benefit from doing a Rebuild on some of the curves before constructing with them when you know you want to use them for Flow - that's because the result of Rebuild is evenly parameterized. So if you see something like a flow on to a 1 rail sweep is kind of stretching or compressing somewhat in various zones, try doing a Rebuild on the rail before doing the sweep - that can result in a sweep that works better for a flow target.

- Michael