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Creating Catmull-Rom Curves

A Catmull-Rom curve is a curve segment in which the curve's slope is defined by a Catmull-Rom control algorithm. The slope of a Catmull-Rom curve at a given point is parallel to a chord between the two adjacent points. At the end of a curve, the slope will be tangent to the end point and the adjacent point.

A cubic curve of Catmull-Rom type
  1. Click on Curve on the toolbar.
  2. Click Entity Type, Connector.
  3. In the Segments, Curve Segment Options frame, toggle on Catmull-Rom.
  4. Click on an arbitrary point in the display window (point A).
  5. Click on a point similar to the location of point B.
  6. Click on a point similar to the location of point C.
  7. See the description below for how to edit the location of a control point before moving on to the next step.

  8. Apply
  9. OK

Editing Control Points

There are two quick ways to edit a control point location before a connector is saved by using the Apply or OK commands. The first method simply requires that you move your cursor over the control point in the display window until it highlights in orange. Hold the left mouse button depressed while you move the point to a new location then release the left mouse button. The second method requires that you select the control point by holding the Ctrl key while left clicking on the point. The control point will become highlighted and the XYZ field in the Point Placement frame will update to contain its current coordinates; change the values and hit Enter to change the control point location.


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If you have questions about the steps outlined above or on any other meshing topic, please contact us via one of the following methods.

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  • Email our support engineers at support@pointwise.com.