Using Control Polygons To use a control polygon: Sketch a spline. Select a control point to activate it and display the Spline Polygon PropertyManager. Drag the control polygon to adjust the shape of the spline. You can also set values for the X Coordinate , the Y Coordinate , or the Z Coordinate (3D splines) in the Spline Polygon PropertyManager. If necessary, click Relax Spline to smooth the shape after dragging. Click . Parent topicControl Polygons Displaying Control Polygons by Default Displaying Control Polygons Spline Polygon PropertyManager