Manufacturing Toolkit
Boundary Representation provides precise definition of a ModelData_Part . B-Rep is defined via a combination of geometry and topology: geometry (points, curves and surfaces) defines a body form and topology (vertices, edges, faces, shells, etc) defines trimming of underlying geometry.
Manufacturing Toolkit API follows the ISO 10303-42 specification and uses its geometrical and topological entities.
The following sections describe supported types of geometrical curves and surfaces and topological entities.
Curves can be defined in 3D model space or in 2D parametric space of a surface. The latter are called parametric space curves or p-curves.
Manufacturing Toolkit provides two hierarchies of classes - for 3D and 2D curves. The former derives from the Geom_Curve class and the latter from the Geom_Curve2d class.
Manufacturing Toolkit supports the following curve types:
The curve type is returned by Geom_Curve.Type() as Geom.CurveType enumeration.
| Type | C++ class | Example |
|---|---|---|
| Line | Geom_Line Geom_Line2d |  |
| Circle | Geom_Circle Geom_Circle2d |  |
| Ellipse | Geom_Ellipse Geom_Ellipse2d |  |
| Hyperbola | Geom_Hyperbola Geom_Hyperbola2d |  |
| Parabola | Geom_Parabola Geom_Parabola2d |  |
| Bezier curve | Geom_BezierCurve Geom_BezierCurve2d |  |
| B-Spline curve | Geom_BSplineCurve Geom_BSplineCurve2d |  |
| Offset curve | Geom_OffsetCurve Geom_OffsetCurve2d |  |
Manufacturing Toolkit supports the following surface types:
Classes representing surfaces subclass the Surface class. The surface type is returned by Geom_Surface.Type() as Geom_SurfaceType enumeration.
| Type | Python class | Example |
|---|---|---|
| Plane | Geom_Plane |  |
| Conical Surface | Geom_ConicalSurface |  |
| Cylindrical Surface | Geom_CylindricalSurface |  |
| Spherical Surface | Geom_SphericalSurface |  |
| Toroidal Surface | Geom_ToroidalSurface |  |
| Surface of Linear Extrusion | Geom_SurfaceOfLinearExtrusion |  |
| Surface of Revolution | Geom_SurfaceOfRevolution |  |
| Bezier Surface | Geom_BezierSurface |  |
| B-Spline Surface | Geom_BSplineSurface |  |
| Offset Surface | Geom_OffsetSurface |
|
Topological entities are used to define the trimming of the geometrical entities and the connectivity between them.
Topological entities are eventually owned by a body (Body).
Classes representing topological entities subclass the ModelData_Shape class.
The shape type is returned by ModelData_Shape.Type() as a ModelData_ShapeType enumeration.
| Type | C++ class | Example |
|---|---|---|
| Vertex | ModelData_Vertex |  |
| Edge | ModelData_Edge |  |
| Wire | ModelData_Wire |  |
| Face | ModelData_Face |  |
| Shell | ModelData_Shell |  |
| Solid | ModelData_Solid |  |
