B-splines

B-splines have become a must for drawing curves. The familiar cubic splines are not sufficient to model special components. Internally, the program has used B-splines for general 3D objects delimited by curves (B-reps) for some time. Now you can use the edges of B-reps as B-splines too.

B-splines are also required for importing splines form design software such as Rhino. In earlier Allplan versions, B-splines were approximated by cubic splines or B-splines were polygonized.

You can also use B-splines as outlines or paths in the Sweep Path and Extrude Along Path tools.