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How to make lofted surface with a smooth tip to make a Y branch

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You must know:

  • Curve Drawing (Curve)

  • Lofting (Loft)
  • Object Snaps
  • Move objects (Move)
  • Turn control points of a surface on (PtOn) and off (PtOff)
  • How to use elevator mode

You will learn:

  • How to make a tubular lofted surface end with a smooth tip

To create a lofted surface with a smooth tip:

  1. Open loft01.3dm.

  2. Use Curve to create several closed curves in the Front view.

    Note: If you want the tip to be perfectly round, make sure
    the cross section curve next to the tip is planar and convex.
    (If you stretch a rubber band around the CVs of a convex
    curve, the band will touch all CVs).

  3. Drag the curves in place in the Perspective view.

  4. Use Loft with Point option. Pick a starting point using
    elevator mode and then pick the rest of the curves.
    This loft will have a sharp tip.

  5. Use PtOn to turn on the CVs of the lofted surface.

  6. Zoom in on the tip of the loft. There's a ring of CVs near
    the tip.
  7. Draw a Line between CVs on the opposite sides of the loft
    using Point Object Snap.

  8. There are many CVs stacked at the tip of the loft. Select
    them all using window selection.

  9. Use Move combined with point and mid object snaps
    to move the CVs from the tip to the middle of the line.

 

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