Being able to use an equation curve with cylindrical projection coordinates would be ideal, since what I need to do is basically a circular helix, just with a progressive pitch. Otherwise Cartesian projection would work.

But I think MoI3D doesn't allow equation curves at least directly. If it does, I haven't been able to find it.

If a helix cannot be represented exactly as a NURBS curve, isn't there at least a way to represent the helix curve with accurate radius at the control points?

Regarding approximation, I did prepare the pitch progression curve I wanted to wrap, using a good point density with the hope that the flow tool would respect at least the Z position of each point so they might get evenly spaced allowing a greater accuracy, but apparently the flow tool doesn't preserve already existing points.

What would be the approach to use the Control Point type curve instead of InterpCurve?