Model Heart Aorta in Rhino 3D

  1. Add one curve vertically between the lower branches (white).
  2. Loft both branches together with this curve (red surface)
  3. Trim this with a plane.
  4. Loft the upper curves.
  5. MatchSrf for tangency the upper to the trimmed loft.
I added a knot horizontally in the lower span of the blue surface before matching to limit the area distorted by Matchsrf.

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