User Guide
User Guide
User Guide

Rebuild Curve

Use it!

Used to “clean up” a B-spline curve that has a large number of control points (poles), like those sometimes created with the Offset Curve tool or imported from other systems.

Tool SettingEffect
Type

Sets the type of curve that is created during the rebuilding.

  • Rebuild
    • — The curve is re-constructed, based on the given tolerance, to produce a “better” curve.
  • Reduce Data
    • — The number of control points is reduced, but the order of the curve is not changed.
  • Reparameterize
    • — Where a curve has all the knots concentrated in a certain region, such as at the beginning of the curve, it may be that the 0.5 knot is not near the middle of the curve. This option attempts to rebuild the curve such that the 0.5 knot corresponds, as near as possible, to the middle of the curve.
Maintain Sharp

(Type set to Rebuild only) If on, all the sharp corners of a curve will be maintained while the intermediate segments of the curve will be reconstructed.

Maintain Tangent

(Type set to Rebuild only) If on, a complex chain (with a line tangent to a B-spline curve) will be reconstructed such that the end result will still have the line and the B-spline tangent to each other, but the B-spline segment will be reconstructed.

Make Copy

(Type set to Rebuild or Reduce Data only) If on, the original curve is not deleted upon creation of the replacement curve.

Maintain End Tangents

(Type set to Reduce Data only) If on, the end tangent directions of the replacement curve are the same as those of the original.

Tolerance

Sets the maximum distance allowed between the replacement curve and the original curve. To make the replacement curve appear identical to the original, even though its complexity is reduced, experiment with different Tolerance values.

To rebuild a B-spline curve
  1. Select the Rebuild Curve tool.

  2. In the tool settings, turn on and adjust the required settings.

  3. Identify the B-spline curve.

  4. Accept to rebuild.

Key-in: REBUILD CURVE

To check the number of control points in a B-spline curve, use the Analyze Element tool in the Primary Tools tool box or choose Information from the Element menu.