When doing extract isocurve, next step often requires split, or split edge to get the edge to use for sweep2.
Steps as below:
- Enter extract isocurve command
- Select surface and extract isocurve
- If the option is set to Yes(for the split edge) then, prompt for which edge to split is shown. (one side or both side)
- After edge is split retern to extracting isocurve.
*If option set to No, same exctract isocurve as current tool.