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The theory is more complex than in previous steps, but applying it is very simple. To learn this aspect of Open CASCADE Technology, you will build helicoidal profiles out of 2D curves on cylindrical surfaces.
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You will now learn how to create an edge out of a 2D curve and a surface. Up to now, you have learned how to create edges out of 3D curves. Void MakeThickSolidByJoin(const TopoDS_Shape &S, const TopTools_ListOfShape &ClosingFaces, const Standard_Real Offset, const Standard_Real Tol, const BRepOffset_Mode Mode=BRepOffset_Skin, const Standard_Boolean Intersection=Standard_False, const Standard_Boolean SelfInter=Standard_False, const GeomAbs_JoinType Join=GeomAbs_Arc, const Standard_Boolean RemoveIntEdges=Standard_False, const Message_ProgressRange &theRange=Message_ProgressRange()) Three edges out of the previously computed curves.Referring to the previous table, to build the profile, you will create: Part of a surface bounded by a closed wire(s). One-dimensional shape corresponding to a curve and bounded by a vertex at each extremity. Zero dimensional shape corresponding to a point in geometry.
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Each object of the TopoDS package, inheriting from the TopoDS_Shape class, describes a topological shape as described below: Shape This can be done by using the topological data structure of Open CASCADE Technology defined in the TopoDS package: it defines relationships between geometric entities which can be linked together to represent complex shapes. To simplify the modeling, it would be right to manipulate these three curves as a single entity. You have created the support geometry of one part of the profile but these curves are independent with no relations between each other. If you need to create a quarter of a circle, you create a Geom_TrimmedCurve on C limited between 0 and M_PI/2.
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For example, circle C is parameterized between 0 and 2PI. This entity represents a base curve (line or circle, in our case), limited between two of its parameter values. A useful constructor creates an arc from two end points P1 and P3 and going through P2.īoth of these classes return a Geom_TrimmedCurve manipulated by handle. Class GC_MakeArcOfCircle to create an arc of a circle.One of its constructors allows you to define a segment by two end points P1 and P2 Class GC_MakeSegment to create a segment.This is because the GC provides two algorithm classes which are exactly what is required for our profile: You can directly instantiate classes belonging to Geom, but it is easier to compute elementary curves and surfaces by using the GC package. However, the Geom package provides only the data structure of geometric entities. The Geom package implements 3D geometric objects: elementary curves and surfaces are provided as well as more complex ones (such as Bezier and BSpline). For example, Geom_Line and Geom_Circle classes belong to the Geom package. The classes have names that start with the name of a package they belong to. In Open CASCADE Technology a package is a group of classes providing related functionality. This can be found in the Geom package of Open CASCADE Technology. To create such entities, you need a specific data structure, which implements 3D geometric objects.