About Creating Silhouette Curves
A silhouette curve produces a valid parting line. To determine where the parting surface for the model should be placed, you can create a silhouette curve on the reference part. When the system creates a silhouette curve, it places the curve on the part where the part surface is normal to the pull direction. The resulting curve may consist of several closed loops including inner loops. You can use the curve to create a Skirt parting surface.