Part Module/zh

Introduction
The solid modelling capabilities of FreeCAD are based on the OpenCASCADE Technology (OCCT) kernel, a professional-grade CAD system that features advanced 3D geometry creation and manipulation. The Part Workbench is a layer sitting on top of the OCCT libraries, that gives the user access to OCCT geometric primitives and functions. Essentially all 2D and 3D drawing functions in every workbench ( Draft, Sketcher,  PartDesign, etc.), are based on these functions exposed by the Part Workbench. Therefore, the Part Workbench is considered the core component of the modelling capabilities of FreeCAD.

The objects created with the Part Workbench are relatively simple; they are intended to be used with boolean operations (unions and cuts) in order to build more complex shapes. This modeling paradigm is known as the constructive solid geometry (CSG) workflow, and it was the traditional methodology used in early CAD systems. On the other hand, the PartDesign Workbench provides a more modern workflow to constructing shapes: it uses a parametrically defined sketch, that is extruded to form a basic solid body, which is then modified by parametric transformations (feature editing), until the final object is obtained.

Part objects are more complex than mesh objects created with the Mesh Workbench, as they permit more advanced operations like coherent boolean operations, modifications history, and parametric behaviour.



Tools
The tools are located in the menu or the  menu.

Primitives
These are tools for creating primitive objects.


 * [[Image:Part_Box.svg|32px]] Box: Creates a box.


 * [[Image:Part_Cylinder.svg|32px]] Cylinder: Creates a cylinder.


 * [[Image:Part_Sphere.svg|32px]] Sphere: Creates a sphere.


 * [[Image:Part_Cone.svg|32px]] Cone: Creates a cone.


 * [[Image:Part_Torus.svg|32px]] Torus: Creates a torus (ring).


 * Part_Tube.svg Tube: Creates a tube.


 * [[Image:Part_Primitives.svg|32px]] Primitives: A tool to create one of the following primitives:
 * [[Image:Part_Plane.svg|32px]] Plane: Creates a plane.
 * [[Image:Tree_Part_Box_Parametric.svg|32px]] Box: Creates a box. This object can also be created with the [[Image:Part_Box.svg|32px]] Box tool.
 * [[Image:Tree_Part_Cylinder_Parametric.svg|32px]] Cylinder: Creates a cylinder. This object can also be created with the [[Image:Part_Cylinder.svg|32px]] Cylinder tool.
 * [[Image:Tree_Part_Cone_Parametric.svg|32px]] Cone: Creates a cone. This object can also be created with the [[Image:Part_Cone.svg|32px]] Cone tool.
 * [[Image:Tree_Part_Sphere_Parametric.svg|32px]] Sphere: Creates a sphere. This object can also be created with the [[Image:Part_Sphere.svg|32px]] Sphere tool.
 * [[Image:Part_Ellipsoid.svg|32px]] Ellipsoid: Creates a ellipsoid.
 * [[Image:Tree_Part_Torus_Parametric.svg|32px]] Torus: Creates a torus. This object can also be created with the [[Image:Part_Torus.svg|32px]] Torus tool.
 * [[Image:Part_Prism.svg|32px]] Prism: Creates a prism.
 * [[Image:Part_Wedge.svg|32px]] Wedge: Creates a wedge.
 * [[Image:Part_Helix.svg|32px]] Helix: Creates a helix.
 * [[Image:Part_Spiral.svg|32px]] Spiral: Creates a spiral.
 * [[Image:Part_Circle.svg|32px]] Circle: Creates a circular edge.
 * [[Image:Part_Ellipse.svg|32px]] Ellipse: Creates an elliptical edge.
 * [[Image:Part_Point.svg|32px]] Point: Creates a point (vertex).
 * [[Image:Part_Line.svg|32px]] Line: Creates a line (edge).
 * [[Image:Part_RegularPolygon.svg|32px]] Regular Polygon: Creates a regular polygon.


 * [[Image:Part_Builder.svg|32px]] Builder: Creates shapes from various primitives.

Modifying objects
These are tools for modifying existing objects.


 * [[Image:Part_Extrude.svg|32px]] Extrude: Extrudes planar faces.


 * [[Image:Part_Revolve.svg|32px]] Revolve: Creates a solid by revolving an object (not a solid) around an axis.


 * [[Image:Part_Mirror.svg|32px]] Mirror: Mirrors the selected object across a mirror plane.


 * [[Image:Part_Fillet.svg|32px]] Fillet: Fillets (rounds) edges of an object.


 * [[Image:Part_Chamfer.svg|32px]] Chamfer: Chamfers edges of an object.


 * [[Image:Part_RuledSurface.svg|32px]] Ruled Surface: Creates a ruled surface.


 * [[Image:Part_Loft.svg|32px]] Loft: Lofts from one profile to another.


 * [[Image:Part_Sweep.svg|32px]] Sweep: Sweeps one or more profiles along a path.


 * [[Image:Part_CompOffsetTools.png|48px]] Offset tools:
 * [[Image:Part_Offset.svg|32px]] 3D Offset: Constructs a parallel shape at a certain distance from an original.
 * [[Image:Part_Offset2D.svg|32px]] 2D Offset: Constructs a parallel wire at certain distance from an original, or enlarges/shrinks a planar face.


 * [[Image:Part_Thickness.svg|32px]] Thickness: Hollows out a solid.


 * Part_ProjectionOnSurface.svg Projection on surface: Projects a logo, text or any face, wire or edge onto a surface.


 * [[Image:Part_CompCompoundTools.png|48px]] Compound Tools:
 * [[Image:Part_Compound.svg|32px]] Make compound: Creates a compound from the selected objects.
 * [[Image:Part_ExplodeCompound.svg|32px]] Explode Compound: Splits up compounds.
 * [[Image:Part Compound‏‎Filter.svg|32px]] Compound Filter: Extracts the individual pieces from compounds.


 * [[Image:Part_Boolean.svg|32px]] Boolean: Performs boolean operations on objects.


 * [[Image:Part_Cut.svg|32px]] Cut: Cuts (subtracts) one object from another.


 * [[Image:Part_Fuse.svg|32px]] Fuse: Fuses (unions) two objects.


 * [[Image:Part_Common.svg|32px]] Common: Extracts the common (intersection) part of two objects.


 * [[Image:Part_CompJoinFeatures.png|48px]] Join features:
 * [[Image:Part_JoinConnect.svg|32px]] Connect: Connects interiors of walled objects.
 * [[Image:Part_JoinEmbed.svg|32px]] Embed: Embeds a walled object into another walled object.
 * [[Image:Part_JoinCutout.svg|32px]] Cutout: Creates a cutout in a wall of an object for another walled object.


 * [[Image:Part_CompSplittingTools.png|48px]] Splitting tools:
 * [[Image:Part_BooleanFragments.svg|32px]] Boolean fragments: Creates all pieces obtained from Boolean operations.
 * [[Image:Part SliceApart.svg|32px]] Slice a part: Slices and splits an object by intersecting it with other objects.
 * [[Image:Part_Slice.svg|32px]] Slice: Slices an object by intersecting it with other objects.
 * [[Image:Part_XOR.svg|32px]] XOR: Removes space shared by an even number of objects (symmetric version of Cut).


 * [[Image:Part Defeaturing.svg|32px]] Defeaturing: Removes features from an object.


 * [[Image:Part_Section.svg|32px]] Section: Creates a section by intersecting an object with a section plane.


 * [[Image:Part_CrossSections.svg|32px]] Cross sections...: Creates one or more cross-sections through an object.


 * [[Image:Part Attachment.svg|32px]] Attachment: Attaches an object to another object.

Measure
Measure: Tools for linear and angular measurements.


 * [[Image:Part_Measure_Linear.svg|32px]] Measure Linear: Creates a linear measurements.


 * [[Image:Part_Measure_Angular.svg|32px]] Measure Angular: Creates an angular measurements.


 * [[Image:Part_Measure_Refresh.svg|32px]] Measure Refresh: Updates all measurements.


 * [[Image:Part_Measure_Clear_All.svg|32px]] Clear All: Clears all measurements.


 * [[Image:Part_Measure_Toggle_All.svg|32px]] Toggle All: Shows or hides all measurements.


 * [[Image:Part_Measure_Toggle_3d.svg|32px]] Toggle 3D: Shows or hides 3D measurements.


 * [[Image:Part_Measure_Toggle_Delta.svg|32px]] Toggle Delta: Shows or hides delta measurements.

Other tools

 * Part_Import.svg Import: Imports from *.IGES, *.STEP, or *.BREP files.


 * Part_Export.svg Export: Exports to *.IGES, *.STEP, or *.BREP files.


 * Part_BoxSelection.svg BoxSelection: Selects faces from a rectangular area.


 * Part_ShapeFromMesh.svg Shape from Mesh: Creates a shape object from a mesh object.


 * Part_PointsFromMesh.svg Points from mesh: Creates a shape object made of points from a mesh object.


 * Part_MakeSolid.svg Convert to solid: Converts a shape object to a solid object.


 * Part_ReverseShapes.svg Reverse shapes: Flips the normals of all faces of selected objects.


 * Create a copy:
 * Part_SimpleCopy‎.svg Create simple copy: Creates a simple copy of a selected object.
 * Part_TransformedCopy.svg Create transformed copy: Creates a transformed copy of a selected object.
 * Part_ElementCopy.svg Create shape element copy: Creates a copy from an element (vertex, edge, face) of a selected object.
 * [[Image:Part_RefineShape.svg|32px]] Refine shape: Cleans faces by removing unnecessary lines.


 * Part_CheckGeometry.svg Check geometry: Checks the geometry of selected objects for errors.


 * Part_MakeFace.svg Make face from wires: Makes a face from a set of wires.

Context menu items

 * Std_SetAppearance.svg Appearance: Determines the appearance of a whole object (color, transparency etc.).


 * Part_FaceColors.svg Set colors: Assigns colors to individual faces of objects.

Preferences

 * [[Image:Preferences-part_design.svg|32px]] Preferences: Preferences available for Part Tools (the Part workbench also uses the PartDesign Preferences).
 * [[Image:Preferences-import-export.svg|32px]] Import Export Preferences: Preferences available for importing from and exporting to different file formats.
 * Fine-tuning: Some extra parameters to fine-tune Part behavior.

Scripting
See Part scripting.

Tutorials

 * Import from STL or OBJ : How to import STL/OBJ files in FreeCAD
 * Export to STL or OBJ : How to export STL/OBJ files from FreeCAD
 * Whiffle Ball tutorial : How to use the Part Module