About Manipulating the Control Mesh
You can manipulate a polygonal control mesh to create the required Freestyle surface. Use the dragger to perform the following operations on the selected mesh elements:
• Move or rotate.
• Perform 1D, 2D, or 3D scaling.
In addition, you can also perform the following operations:
• Position the mesh elements using a reference plane or a view orientation.
• Align the selected mesh elements with reference to an external plane or a planar surface. By default, you can maintain associativity between the resultant Freestyle geometry and its references.
• Align 1–sided and 2–sided edges with reference to external geometry such as an edge or a curve. You can use all the Freestyle commands on such aligned edges. However, you can move the vertices of the aligned control mesh only along the edge or the curve.
• Orient the selected mesh elements with reference to a planar surface or a datum plane.