alt-text Focus on Sketches

Updated : 21 November 2024

Sketches and Topologies

Sketches are composed of several objects known as topologies, which are linked to geometries. These topologies include:

  • Vertices: Attached to points.
  • Segments: Attached to curves.
  • Profiles: Composed of a sequence of segments.

  • Sections: Composed of one or more profiles and must be closed.

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The diagram below illustrates the relationships between the various elements of a sketch. From a section, we can deduce the profiles that make it up. Similarly, from a section, we can determine the segments it contains, and from a segment, we can identify the associated vertices.

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Access to 2D and 3D Sketches

2D and 3D sketches can be accessed through the ISketches2D and ISketches3D interfaces, which are returned by the TopSolidHost.Sketches2D and TopSolidHost.Sketches3D properties, respectively.

In a 2D or 3D document, sketches can be retrieved using the methods TopSolidHost.Sketches2D.GetSketches and TopSolidHost.Sketches3D.GetSketches.

Modifying a Sketch

To begin modifying a sketch, first create it using the CreateSketchIn3D method.

Important

You must initiate the modification process with TopSolidHost.Sketches2D.StartModification and conclude it with TopSolidHost.Sketches2D.EndModification.

Any topology created during this modification will be associated with the sketch.