You can create a surface or polygon mesh by picking a series of curves in U and V. Curve Net is similar to Loft, but you can control the detail in both the U and V directions. For best results, make sure the curves intersect each other as closely as possible, particularly at the boundaries.
To create a surface or polygon mesh using Curve Net
Optionally, select one or more U curves in order. You can select curve objects as well as U or V isolines, U or V knot curves, boundaries, surface curves, and trim curves.
Choose one of the following commands from the Model toolbar:
Right-click to indicate that you have finished picking U curves.
Adjust parameters as necessary: