To Offset a Curve Along a Surface
1. Select a curve and click Refine Model > Offset. The surface is highlighted, and the Offset tab opens. The selected curve appears in the Offset curve collector on the References tab.
2. Select to offset the curve in the direction along the reference surface.
3. Select a quilt or surface to act as a reference for the offset curve. By default, the quilt or surface on which the offset curve is located is selected as the reference.
4. Type an offset value in the box.
5. Click to flip the direction of the offset, if necessary.
6. In the Measurements panel, specify the measurement type as either (normal to curve) or (parallel to plane). If you select , select a reference plane.
7. Click .
* 
If you are using a chain as a reference and you want to modify it, click Details on the References tab and use the Chain dialog box.
For more information, refer to the Part Modeling Help.
這是否有幫助?