Polyline objects have two or more vertices. To create a polyline object, the user does the following:

1.The user either selects Object|Create|Polyline or clicks on the Create polyline object button .

2.The user moves the cursor to the location on one of the views of the model where the first vertex of the polyline object is desired.

3.The user clicks the left mouse button. The first vertex of the polyline object will be created at the cursor location.

4.To create additional vertices, the user continues clicking on the same view of the model.

5.When all the desired vertices have been created, the user double-clicks at the last vertex or presses the “Enter” key on the keyboard to complete the polyline. Pressing the escape or delete key while creating an object deletes the last created vertex of that object. As with points, the Object Properties dialog box is used to specify the properties of the object.

If the Shift button is held down when the mouse button is clicked and there is a vertex on another visible object within 3 pixels of the cursor, the new vertex will be at the same location as the vertex on the other object.

Typical uses for polylines are to define linear features, such as rivers and boundary conditions at the edges of the model.