Description
A surface defined using the standard BSpline definition based on the capabilities of the Mesh entity representing the control polygon. The surface supports the non-uniform knot vector but not the rational capabilities of NURBS. However, surface developed entirely interactively remain uniform. Multiple BSpline Surfaces can be combine into groups (BSplineSurfaceList) to optimise screen updates when not requiring manipulation. The BSpline Surface can be converted into a Facet surface (PolygonList), used to create Calculation Sections for hydrostatics calculations or the surface converted into a Mesh instance.
Creation
Menu: Create -> BSpline Surface... / Create -> Drag BSpline Surface.
Interactively create a BSpline Surface by Left-Clicking to draw a rectangle defining the corner points of the control polygon. The initial orientation of surface will be defined on the Default Edit Plane. Alternatively, the Create BSpline Surface dialog box can be used to define the surface and orientation parametrically.
See Also:-
Interactive Editing
Edit mode is entered by pressing F2 displaying the control polygon of the surface. The control points of the entity are selected and edited using the PolyCAD standard surface manipulation techniques.
See Also:-
Entity Attributes Panel
BSpline Surface Attributes Panel
Edit Menu
- Edit (F2)
- Show Attributes... (F11)
- Surface Order
- Knuckle in U
- Knuckle in V
- SubDivide in U
- SubDivide in V
- Reverse in U
- Reverse in V
- Flip U-V
- Extract Edges
- Fill Edges to Centerline
- Generate Polygon Mesh
- Convert to Surface Mesh
- Control Points to Mesh
- Extract Contours
- Create Calculation Sections
Multi-Select Menu
- Convert BSpline Surface Representation to Meshs
- Convert BSpline Surface Control Polygons to Meshs
- Create BSpline Surface List
- Create Closed Group
- Create Open Group
Display Options
Short Cuts
File Format
none
Import / Export
| Format | Import | Export |
|---|---|---|
| AutoCAD DXF | Yes | as Mesh |
| Initial Graphics Exchange Spec. (IGES) | Yes | Yes |
| Defcar - ShipGEN Template | Yes | |
| FastShip (SRF) | Yes | Yes |
| ACIS (Autodeck/Tribon/Aveva Marine Initial Design) | Yes | Yes |
Articles
none
References
none