Reverses the parametric (U) direction of a curve, causing the start of the curve to become the end, and vice-versa. This tool also lets you examine the tangent direction on the curve.
Access this tool from the Curve Edit tool palette:
Reverse Curve workflows
Select the Reverse Curve tool.
Click the first curve you want to reverse.
The tangent of the curve is shown at the point where you clicked.
Do any of the following:
Click on another curve to add to the selection and repeat step 3.