Creating Curves Using Control Points

Applying a Tangency Constraint on a Point

You can apply tangency constraints on a point during 3D curve creation or modification.


Before you begin: Open an existing 3D shape containing a curve.
  1. Move the pointer over an existing curve, double-click it, then right-click and select Impose Tangency.
    Two sets of handles are displayed:
    • An arrow representing the tangency vector.
    • Two circles, each having a zone for this vector.
  2. Adjust the tangency constraint by doing any of the following:
    • To modify the direction of the tangency vector, drag the circle.
    • To invert the direction of the tangency vector, double-click the arrow.
    • To modify the amplitude of the tangency vector, drag the arrow.
  3. To define the constraint according to an external element, right-click any of the handles.
  4. Select one of the options from the context menu.
  5. Once you are satisfied with the tangency constraint you imposed, release the handle and move the pointer around to display the curve preview.
    You are now ready to create a new point.