A curve defined using the standard BSpline definition based on the capabilities of the Polyline entity. The curve supports the non-uniform knot vector but not the rational capabilities of NURBS. However, curves developed interactively remain uniform. The entity can extrude a BSpline Surface though the loft command and two BSpline curves can be used to produce a Ruled surface.


Menu: Create -> BSpline Curve

Interactively create a BSpline curve by Left-Clicking to create the points of the control polygon. The initial orientation of curve will be defined on the Default Edit Plane.

See Also:-

Interactive Editing

Edit mode is entered by pressing F2 displaying the control polygon of the curve. The control points of the entity are selected and edited using the PolyCAD standard manipulation techniques.

See Also:-

Entity Attributes Panel

BSpline Attributes Panel

Edit Menu

Multi-Select Menu

Display Options

Show Curvature

Short Cuts

File Format

BSpline Curve File Data Structure

Import / Export

Format Import Export
AutoCAD DXF Yes Yes
Initial Graphics Exchange Spec. (IGES) Yes Yes
Ansys Element Script   As Polyline
Gridgen Glyph Script   Control Points only, Convert to Polyline
ACIS (Autodeck/Tribon/Aveva Marine Initial Design) Yes Yes