# 4 Edges

[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.

## Step 1

For the prompt "Specify the V-Min curve", specify an edge of the surface, which will be V=minimum parameter line of the sureface.

## Step 2

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.

## Step 3

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.

## Step 4

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.