Menu: Draw / Surface Patch
Fits a smooth surface between any three or four lines, curves, or arcs which meet at their endpoints to form a closed area.
Point 1: First line
Point 2: Second line
Point 3: Third line
Point 4: Fourth line (optional)
Specify the grid spacing for the surface.
The line entities must share endpoints and make up a closed area or Surface Patch will not work properly. Press Enter when you are finished. The lines are used as a boundary for a surface.