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Revision as of 15:58, 13 October 2020
Introduction
The main data structure used in the Part module is the BRep data type from OpenCascade. Almost all contents and object types of the Part module are available by Python scripting. This includes geometric primitives, such as Line and Circle (or Arc), and the whole range of TopoShapes, like Vertexes, Edges, Wires, Faces, Solids and Compounds. For each of those objects, several creation methods exist, and for some of them, especially the TopoShapes, advanced operations like boolean union/difference/intersection are also available. Explore the contents of the Part module, as described in the FreeCAD Scripting Basics page, to know more.
The most basic object that can be created is a Part Feature, which has a simple DonnéesPlacement property, and basic properties to define its color and appearance.
Another simple object used in 2D geometrical objects is Part Part2DObject, which is the base of Sketcher SketchObject (Sketcher), and most Draft elements.
See also
Test script
Test the creation of Part Primitives with a script. introduced in version 0.19
import parttests.part_test_objects as pto
pto.create_test_file("example_file")
This script is located in the installation directory of the program, and can be examined to see how the basic primitives are built.
$INSTALL_DIR/Mod/Part/parttests/part_test_objects.py
Examples
To create a line element switch to the Python console and type in:
import Part,PartGui
doc=App.newDocument()
l=Part.LineSegment()
l.StartPoint=(0.0,0.0,0.0)
l.EndPoint=(1.0,1.0,1.0)
doc.addObject("Part::Feature","Line").Shape=l.toShape()
doc.recompute()
Let's go through the above python example step by step:
import Part,PartGui
doc=App.newDocument()
loads the Part module and creates a new document
l=Part.LineSegment()
l.StartPoint=(0.0,0.0,0.0)
l.EndPoint=(1.0,1.0,1.0)
Line is actually a line segment, hence the start and endpoint.
doc.addObject("Part::Feature","Line").Shape=l.toShape()
This adds a Part object type to the document and assigns the shape representation of the line segment to the 'Shape' property of the added object. It is important to understand here that we used a geometric primitive (the Part.LineSegment) to create a TopoShape out of it (the toShape() method). Only Shapes can be added to the document. In FreeCAD, geometry primitives are used as "building structures" for Shapes.
doc.recompute()
Updates the document. This also prepares the visual representation of the new part object.
Note that a Line Segment can be created by specifying its start and endpoint directly in the constructor, for example Part.LineSegment(point1,point2), or we can create a default line and set its properties afterwards, as we did here.
A Line can be created also using:
import FreeCAD
import Part
DOC = FreeCAD.newDocument()
def mycreateLine(pt1, pt2, objName):
obj = DOC.addObject("Part::Line", objName)
obj.X1 = pt1[0]
obj.Y1 = pt1[1]
obj.Z1 = pt1[2]
obj.X2 = pt2[0]
obj.Y2 = pt2[1]
obj.Z2 = pt2[2]
DOC.recompute()
return obj
line = mycreateLine((0,0,0), (0,10,0), "LineName")
A circle can be created in a similar way:
import Part
doc = App.activeDocument()
c = Part.Circle()
c.Radius=10.0
f = doc.addObject("Part::Feature", "Circle")
f.Shape = c.toShape()
doc.recompute()
or using:
import FreeCAD
import Part
DOC = FreeCAD.newDocument()
def mycreateCircle(rad, objName):
obj = DOC.addObject("Part::Circle", objName)
obj.Radius = rad
DOC.recompute()
return obj
circle = mycreateCircle(5.0, "CircleName")
Note again, we used the circle (geometry primitive) to construct a shape out of it. We can of course still access our construction geometry afterwards, by doing:
s = f.Shape
e = s.Edges[0]
c = e.Curve
Here we take the shape of our object f, then we take its list of edges. In this case there will be only one because we made the whole shape out of a single circle, so we take only the first item of the Edges list, and we takes its curve. Every Edge has a Curve, which is the geometry primitive it is based on.
Head to the Topological data scripting page if you would like to know more.
- Scripts FreeCAD : Python, Introduction à Python, Tutoriel sur les scripts Python, Débuter avec les scripts
- Modules : Modules intégrés, Unités, Quantity
- Ateliers : Création d'atelier, Commands Gui, Les commandes, Installer des ateliers supplémentaires
- Maillages et objets Parts : Scripts Mesh, Script de données topologiques, Conversion objet Mesh en Part, PythonOCC
- Objets paramétriques : Objets créés par script, Viewproviders (Icône personnalisée dans l'arborescence)
- Scénographie : Graphe de scène Coin (Inventor), Pivy
- Interface graphique : Création d'interface, Création d'une boite de dialogue (1, 2, 3, 4, 5), PySide, Exemples PySide débutant, intermédiaire, expérimenté
- Macros : Macros, Comment installer des macros
- Intégration : Intégrer FreeCAD, Intégration de FreeCADGui
- Autre : Expressions, Extraits de codes, Fonction - tracer une ligne, Bibliothèque mathématique vectorielle de FreeCAD (déprécié)
- Primitives : Box, Cylindre, Sphère, Cône, Tore, Tube, Primitives, Générateur de formes
- Création et modification des objets : Extrusion, Révolution, Miroir, Congé, Chanfrein, Créer une face, Surface réglée, Lissage, Balayage, Section, Coupes, Décalage 3D, Décalage 2D, Évidement, Projection sur surface, Ancrage
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- Booléen : Créé un composé, Éclater le composé, Filtre composé, Opération booléenne, Soustraction, Union, Intersection, Connecter, Intégrer, Découper, Fragments booléens, Séparer/exploser, Scinder, OU exclusif
- Mesure : Mesure linéaire, Mesure Angulaire, Rafraîchir les mesures, Effacer toute mesure, Tout basculer, Mesures dans la 3D, Mesures selon le repère global
- Autre outils : Importation, Exportation, Sélection par zone, Forme à partir d'un maillage, Points à partir d'un maillage, Convertir en solide, Inverser les formes, Copie simple, Copie transformée, Copie d'un élément, Affiner la forme, Vérifier la géométrie, Supprimer la fonctionnalité, Apparence, Définir les couleurs