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Creating Circle Curves

A circle can be drawn using four different methods. Two of the circle methods define a circle curve by three points, whereas the other two options define a circle by two points and an angle.

A circle defined by three points

2 Points & Shoulder

  1. Click on Curve on the toolbar.
  2. Click Entity Type, Connector.
  3. Click Segment Type, Circle.
  4. In the Segments, Circle Segment Options frame, toggle on 2 Points & Shoulder.
  5. In the Point Placement frame, click in the XYZ text field.
  6. 0 0 0 (point A, the first control point)
  7. 10 0 0 (point B, the second control point)
  8. 5 5 0 (point C, the shoulder point)
  9. See the description below for how to edit the location of a control point before moving on to the next step.

  10. Apply
  11. OK

2 Points & Center

  1. Click on Curve on the toolbar.
  2. Click Entity Type, Connector.
  3. Click Segment Type, Circle.
  4. In the Segments, >Circle Segment Options frame, toggle on 2 Points & Center.
  5. In the Point Placement frame, click in the XYZ text field.
  6. 0 0 0 (point A, the first control point)
  7. 10 0 0 (point B, the second control point)
  8. 5 0 0 (point C, the center point)
  9. See the description below for how to edit the location of a control point before moving on to the next step.

  10. Apply
  11. OK

2 Points & Angle

  1. Click on Curve on the toolbar.
  2. Click Entity Type, Connector.
  3. Click Segment Type, Circle.
  4. In the Segments, Circle Segment Options frame, toggle on 2 Points & Angle.
  5. In the Point Placement frame, click in the XYZ text field.
  6. 0 0 0 (point A, the first control point)
  7. 10 0 0 (point B, the second control point)
  8. Enter 180 degrees for the Angle.
  9. If you wish to flip the circle, press Flip next to the text field for the Angle. Also, if 90 is entered for the Angle, notice that the center point of the circle moves as the angle is redefined using the two stationary control points.

    See the description below for how to edit the location of a control point before moving on to the next step.

  10. Apply
  11. OK

Point, Center & Angle

  1. Click on Curve on the toolbar.
  2. Click Entity Type, Connector.
  3. Click Segment Type, Circle.
  4. In the Segments, Circle Segment Options frame, toggle on Point, Center & Angle.
  5. In the Point Placement frame, click in the XYZ text field.
  6. 0 0 0 (point A, the first control point)
  7. 10 0 0 (point B, the center point)
  8. Enter 180 degrees for the Angle.
  9. If you wish to flip the circle, press Flip next to the text field for the Angle. Also, if 90 is entered for the Angle, notice that the arc of the circle is cut in half as the angle is redefined using the stationary control point and the center point.

    See the description below for how to edit the location of a control point before moving on to the next step.

  10. Apply
  11. 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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