MicroStation PowerDraft CONNECT Edition Help

To Place a B-spline Curve by Entering Data Points

  1. Select the B-spline by Points tool (Drawing > Home > Placement > Create Curves split button).

  2. In the tool settings window, set Input By to Points (AccuDraw).
  3. Enter a data point to define the curve's beginning.
  4. Enter a series of data points.
    Method Each data point defines
    Control Points One of the control polygon's poles.
    Through Points or Catmull-Rom A point through which the curve must pass.
    L-Square By Tol or L-Square By Num One of a set of points that the curve must approximate.
  5. If Closure is set to Open, enter a data point to define the curve's end.

    Method: Control Points, Input By: Points (AccuDraw), Closure: Open

  6. Reset.

    The curve is generated unless Method is set to Through Points or L-Square By Tol and Closure is set to Open. In this case, continue with step 7.

  7. If Tangents is set to Start, End, or Both, enter a data point to define the starting or ending tangent direction.
  8. If Tangents is set to Both, enter a data point to define the ending tangent direction.

    Left: Method: Through Points, Input By: Points (AccuDraw), Closure: Open, and Tangents: Both. Right: Method: Catmull-Rom.

Parent topic: B-spline by Points