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How to bend a blend surface

You need to know:

    • Curve Drawing (InterpCrv)

    • Revolved Surfaces (Revolve)
    • Project curve to surface (Project)
    • Split surface with curve (Split)
    • Blend between surfaces (BlendSrf)
    • 2-D and 3-D rotate (Rotate, Rotate3d)
    • Move objects (Move)

    You will learn how to:

    • Show control points on surfaces (PtOn)

    • Select control points (Lasso, SelU, SelV)
    • Hide control points (HidePt)
    • Modify a blend surface, keeping it connected
      and curvature continuous with the adjacent surfaces.

    To bend a blend surface:

  1. Open blend01.3dm

  2. Create two revolved objects, a "body" and a "leg".

  3. Draw two curves and project them to the surfaces.
  4. Split the surfaces using the projected curves.
  5. Delete the unnecessary surface pieces and create a blend surface between the openings.

  6. Select the blend surface.

  7. Type PtOn and press ENTER to show control points on the surface.
  8. Select three rows of CVs on the side you do NOT want to modify. Use Lasso or select one CV from each row and type SelU.
  9. Type Hidept and press ENTER to hide the selected CVs.

  10. In the Right view, select the CVs and the surface to modify.

  11. Use rotate3d, rotate or move to stretch and bend the selected objects. This way the blend surface will stay connected to both mating surfaces and maintain curvature continuity.

 

 

© 1998 Robert McNeel & Assoc.

Robert McNeel & Associates • 3670 Woodland Park Avenue North • Seattle WA 98103 • 206-545-7000 • F 206-545-7321