Create

Create a new PolyNURBS object from scratch, add new faces to an existing PolyNURBS object, or close a hole in an existing PolyNURBS object.

1. On the ribbon, click the PolyNURBS tab.
2. Click the Create Face icon.
   
   
3. Click to add a new point. Drag a point to move it.
   Note: Add at least 3 points to create a valid face.
4. Right-click and mouse through the check mark to exit, or double-right-click.

Create a surface by drawing a polyline and extruding it. This tool is useful for tracing a sketch to quickly create a PolyNURBS model from scratch.

1. On the ribbon, click the PolyNURBS tab.
2. Click the Create Polyline icon.
   
   
3. Click to add a new point. Drag a point to move it.
4. Do one of the following:
   • To finish the polyline: Right-click and mouse through the check mark to exit, or double-right-click.
   • To start a new polyline: Right click, and select Finish this polyline and start a new one.
5. To enter edge editing mode:
   • Press S.
   • In the guide bar, click Edges .
6. Extrude edges:
   Note: You can extrude edges that are attached to a face on only one side; you cannot extrude interior edges.

   1. Select the edges you want to extrude.
   2. Do one of the following:
      • To extrude freely, drag the arrow.
        
        

      • To extrude selected edges freely in the same direction, hold down Ctrl instead of Alt while dragging.

        (When you extrude multiple edges, by default each edge is extruded along its own tangent direction to better maintain the PolyNURBS object's original shape. However, this may lead to undesired results, such as overlapping edges.)

      • To extrude perpendicular or parallel to the selected edge, hold down Alt+Shift and drag. The dotted red line indicates that you are snapping along the perpendicular or parallel direction.
        
        
   3. Optional: Enter a precise length in the microdialog. Click Done.
7. Right-click and mouse through the check mark to exit, or double-right-click.

In order to start creating a PolyNURBS object from a NURBS object, extract a polyline from an existing NURBS object .

1. On the ribbon, click the PolyNURBS tab.
2. Click the Extract Polyline icon.
   
   
3. Select one or more curves/edges of the NURBS object.
4. You have the following options:

   Option	Description
   Fit type	Select one of the following: Fit By Tolerance: By default, the curve fits the Modeling tolerance defined in the Preferences. To define a custom tolerance, select Use Custom Tolerance, and then enter a Custom Tolerance. Increase the tolerance to decrease the number of points. Fit By Number of Points: Type the number of Control Points. You can also enter the Degree of the curve.
   Join Input Curves	Join multiple input curves. The curves need to be tangent.

5. Right-click and mouse through the check mark to exit, or double-right-click.