Need help with Tween Curve

Hi im brand new to rhino.
Hi, I’m brand new to Rhino. I’m trying to create a densely packed topography graph using the Tween Curve tool between two irregular curves that I have here in white. I want the curves to fill the middle, but it seems like they’re not following the reference curves toward the right side.


TweenCurve will never work for this kind of stuff, as it matches the two outer curves by length divisions, and that doesn’t work for anything but the simplest, smoothest contours.

If you have only one or two curves to do, then there is a workaround that can help - although it will not solve all cases either.

  • Draw a line on either end connecting the two curves.
  • Run Sweep2 with the contour lines as rails and the two end lines as profiles.
  • While in the command, click on “Add Slash” and start connecting the logical points on the two curves.
  • Add as many slashes as necessary until you see the flow between the curves looks good, then OK to create the surface.
  • Then, divide one of the end lines into the number of tween curves you need
  • Use ExtractIsocurve, choose the correct direction U or V, then snap the cursor to the division points you just made.
  • Delete the surface.

Initial Sweep2

After slashes added

Divide/ExtractIsocurves

Result

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