The features available from the Create>Spline drop-down and palette submenus allow you to create various spline types. These options appear when you select Spline from the Create Menu. A spline is a smooth curve that passes through a defined set of nodes, or knot points.

When creating splines, it will be important to keep the following in mind:

• A spline must have at least two nodes.

• If two consecutive nodes are closer than 0.00001 units, the second point is ignored and the spline is created.

• The more segments you create in the spline, the greater the round-off error that accumulates toward the end of the spline.

• A spline has continuity of slope and curvature at all points.

• The program does not check for spline looping, that is, a spline that intersects itself.

• Splines are treated as single entities.

• In 2D construction mode, the spline is created in the current construction plane. It projects all selected nodes to this construction plane.

• In 3D construction mode, a plane is defined with the indicated nodes. If a plane is found, the spline is created on that plane. If a plane cannot be defined with the indicated nodes, the spline is created and the nodes projected to the current construction plane.

To view information on a feature available from the Create>Spline submenu, click the appropriate link below:
2D Open
2D Closed
2D Auto
3D Open
3D Closed
3D Auto
Nurbs Through Positions
Nurbs Control Positions
Nurbs Helix
Nurbs Spiral
Nurbs from Polyline
Nurbs Blend Curve
Nurbs Chain
Nurbs from Point-Vector
Nurbs from Data