The following illustration demonstrates the versatility of X-Topology Curves and their constraints. X-Topology Curves start out as ordinary BSpline Curves but by applying the constraint tools, found under the Right-Click menu, different shapes can be applied to the curve. These shapes stay in the curve and update as it is manipulated until the user removes the constraint again using the Right-Click menu.

The initial curve we will use in this example starts out as a standard uniform BSpline curve but will compose of multiple BSpline segments, which may be non-uniform, following the application of constraint relationships. The curve is drawn exactly the same as any other curve, instigated from the Create menu. However, it does have some additional dynamic snapping features which are demonstrated in the example here.

All Curve constraints are accessed from the right click menu. Either select a single, pair or range of points for different options to be available to you.

In this example a knuckle constraint has been applied to the selected point nearest the mouse cursor.

A straight segment constraint has been subsequently applied to the pair of points following the knuckle point in the previous image.

A blend constraint has been applied to the pair of points nearest the mouse cursor.

In this example, the previous constraints have been removed and points 3 to 6 have been made interpolation points.

The previous constraints have been removed, and the cubic spline curve constraint applied.

This image illustrates the Polyline constraint.

Behind the scenes, the curve is still made up of a number of non-uniform bspline curves. The control polygon of these curves can be displayed using the right click menu, Right-Click -> X-Topology Curve -> Show Control Polygon. This image show the control polygon for the Cubic Spline Curve example.

This image shows the control polygon when points 3 to 6 were interpolation points.