geometry

The geometry module contains the core functionality to represent objects used for a bluemira analysis. The geometrical core of bluemira is based on the OpenCASCADE package, by means of the FreeCAD Python wrapper. A basic api has been implemented to interface with the main FreeCAD objects and functions.

An alternative wrapper backend is available: cadquery. To change the backend, set the environment variable BLUEMIRA_GEOMETRY_BACKEND. Valid values: freecad (default), cadquery. You can also use the cadquery viewer by simply calling show_cad(geometry, backend="cadquery").

Note

The default backend is presently FreeCAD, but will be switched to cadquery in future.

The geometrical module of bluemira implements the following main classes:

• bluemira.geometry.wire.BluemiraGeo: geometry abstract class

• bluemira.geometry.wire.BluemiraWire: a container of FreeCAD Part.Wire objects

• bluemira.geometry.face.BluemiraFace: a container of FreeCAD Part.Face objects

• bluemira.geometry.shell.BluemiraShell: a container of FreeCAD Part.Shell objects

• bluemira.geometry.solid.BluemiraSolid: a container of FreeCAD Part.Solid objects

Main functions to create or manipulate geometry objects are implemented within bluemira.geometry.tool. A lot of the functionality can be explored in our examples. Further discussion on the background and basics are linked below.

Contents:

• Creation
• Shape operations
• Exporting
• FreeCAD objects
• Geometry Parameterisation
  • PrincetonD
  • PrincetonDDiscrete
  • TripleArc
  • SextupleArc
  • Polyspline
  • PictureFrame
    • Tapered Inner Leg
    • Curved Top or Bottom Legs