Fix: use a slider 0 → 2π or add a Radians component to convert degrees.

@Ertunc Hunkar hum interesting, can you show us in a GH script, please?

@Ertunc Hunkar Cool, Many thanks for that!

or Flip Curve - Add a Flip Curve component. - Connect one of your curves to the Reference Curve input, and the other curve to the Curves to Flip input. - This makes sure both curves run in the same direction.

Hum The Rectangle is being built from the plane origin as a corner (min X/min Y), not from its centre

Or... Unless the curve was rebuilt with evenly distributed parameters, 0.5 usually won’t sit at the visual midpoint. Rhino stores curves in NURBS form, where parameters depend on knot spacing, not arc length. How to get the true midpoint by length: - Use Evaluate Length instead of Evaluate Curve. - Give it L/2 or the normalized value 0.5 in “Evaluate Length” (make sure “Normalized” is checked). - That returns the point at 50% of the curve’s arc length. So the blue point is “parameter 0.5,” while the white dot is the “arc-length midpoint.” Different beasts!