[4 Edges] command generates a surface with 4 edges specified, which will be the boundary of the surface. Each end points of the edges must coincide and the whole 4 edges must make a closed loop.
For the prompt
"Specify the V-Min curve"
, specify an edge of the surface, which will be
V=minimum parameter line of the sureface.
For the prompt
"Specify U-Max curve"
, specify an edge whose end coincides with the 1st
curve's end. This will be U=maximum parameter line of the surface.
For the prompt
"Specify V-Max curve"
, specify an edge whose end coincides with the 2nd
curve's end. This will be V=maximum parameter line of the surface.
For the prompt
"Specify U-Min curve"
, specify an edge that connects the 3rd curve's end
and 1st curve's end. This will be U=minimum parameter line of the surface.
After selection is finished, the command make a surface to append onto the document.