Part TopoShape/it

Introduzione

Una Part TopoShape, o formalmente una Part::TopoShape, è una classe che definisce una "forma topologica" parametrica nel software. Gli oggetti del documento che mostrano qualcosa nella vista 3D normalmente hanno una TopoShape.

Le forme topologiche, così come i loro metodi, sono definiti dal kernel OpenCASCADE Technology (OCCT). FreeCAD usa queste forme e crea dei App DocumentObjects attorno ad esse.

Diagramma semplificato delle relazioni tra gli oggetti principali del programma. La classe Part::TopoShape è incorporata nell'oggetto Part::Feature e da lì viene propagata a tutti gli oggetti che ne derivano.

Utilizzo

TopoShape è un oggetto assegnato ad alcuni App DocumentObjects.

In particolare, l'oggetto base che gestisce questi tipi di forme è la Part Feature (classe Part::Feature). Tutti gli oggetti derivati da questa classe avranno accesso a una Part TopoShape.

Alcuni degli oggetti più importanti con Part TopoShape sono i seguenti:

• Qualsiasi solido primitivo creato con Part.
• Qualsiasi Corpo di PartDesign e PartDesign Feature creati con PartDesign.
• Qualsiasi oggetto derivato da Part Part2DObject, come la maggior parte degli oggetti creati con Draft.
• Qualsiasi schizzo, cioè, Sketcher SketchObject, creato con Sketcher.
• Qualsiasi oggetto creato importando uno STEP, BREP e file simili in formato solido.

Scripting

See also: FreeCAD Scripting Basics, and scripted objects.

All objects derived from Part::Feature will have a Part TopoShape, which is normally accessible from its Shape attribute.

import FreeCAD as App

doc = App.newDocument()
obj = App.ActiveDocument.addObject("Part::Box", "Box")
print(obj.Shape)

A TopoShape has many attributes (variables) and methods that contain information about it, and which allow doing operations with it. These variables and methods can be tested in the Python console.

print(obj.Shape.Area)
print(obj.Shape.BoundBox)
print(obj.Shape.CenterOfMass)
print(obj.Shape.ShapeType)

obj.Shape.check()
obj.Shape.copy()
obj.Shape.exportStep("my_file.step")
obj.Shape.exportStl("my_file.stl")

For a full list of attributes and methods, consult the source documentation, and the Std PythonHelp tool.

Part

• Primitives: Box, Cylinder, Sphere, Cone, Torus, Tube, Create primitives, Shape builder

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• Creation and modification: Extrude, Revolve, Mirror, Fillet, Chamfer, Make face from wires, Ruled Surface, Loft, Sweep, Section, Cross sections, 3D Offset, 2D Offset, Thickness, Projection on surface, Attachment

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• Boolean: Make compound, Explode Compound, Compound Filter, Boolean, Cut, Fuse, Common, Connect, Embed, Cutout, Boolean fragments, Slice apart, Slice, XOR

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• Measure: Measure Linear, Measure Angular, Measure Refresh, Clear All, Toggle All, Toggle 3D, Toggle Delta

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• Other tools: Import, Export, Box selection, Shape from Mesh, Points from mesh, Convert to solid, Reverse shapes, Create simple copy, Create transformed copy, Create shape element copy, Refine shape, Check geometry, Defeaturing, Appearance, Color per face

Oggetti del documento

• Cuore: App DocumentObject
• Base: App FeaturePython, App GeoFeature, Part Feature, Mesh Feature, Fem FemMeshObject
• Forme interne: Part TopoShape, Mesh MeshObject, Fem FemMesh

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• Struttura: App DocumentObjectGroup (Std Group), App Part (Std Part), App Link
• Derivate: Part Part2DObject, Sketcher SketchObject, PartDesign Body, PartDesign Feature

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• Spiegazione: Model, Shape, Body, Feature, Part, Mesh, Sketch, Drawing

User documentation

• Getting started
• Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
• Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate

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• Help: Tutorials, Video tutorials
• Workbenches: Std Base, Arch, Assembly, CAM, Draft, FEM, Inspection, Mesh, OpenSCAD, Part, PartDesign, Points, Reverse Engineering, Robot, Sketcher, Spreadsheet, Start, Surface, TechDraw, Test Framework, Web

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• Addons: Addon Manager, External workbenches, Scripting and macros

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• Hubs: User hub, Power users hub, Developer hub