B-Splines by control points

See also: Splines by interpolation, Bezier Splines, B-Spline from scattered points,  Convert into b-spline.

Menu access : Curves | Splines

Description:

Creates a spline curve constraint by its control points.

The resulting curve has a degree 3 and accumulated at end.

General philosophy:

1. Choose CONTROL in the list.

2. Select the starting point of the curve.

3. Select the passing points.

4. Use the  STOP  button when you have selected the last point.

Available Option(s) :

The option  Mode= OPEN  or  CLOSED  allows you to choose the curve type you want to get. An open curve has distinct extremities. While a close curve has no extremities; the first and last points are automatically linked.

Example(s):

Specific point(s):

You can select several time the same point to "overload" a point.

Thanks to the function "Edit | Insert", you can dynamically insert a knot or a point into a basic b-spline.

•  Insert= POINT  allows to insert a new point and modify the b-spline geometry.

•  Insert= KNOT  allows to insert a new point without modifying the actual b-spline geometry.

Available modification(s):

The icon allows you to show or hide the interpolation points of the curve. You can also change the degree of the curve and thus change the influence of the control polygon on the curve.

The icon allows you to move a point of the curve or the curve itself.

The icon allows you to change the influence on the curve of a specific point.