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Part

Part DatumPlane

Std Base

Description

The Part CoordinateSystem command creates a local coordinate system, an LCS object, that can be attached to other objects. A coordinate system is one of several datum objects. A datum object is typically used to attach multiple other objects to. If the position or orientation of a datum object changes, all objects attached to it will follow.

A datum object can also provide a geometric reference for a feature or operation. Depending on its type it may for example be used as a direction vector, a rotation axis or a mirror plane.

Usage

1. Optionally activate the correct container, for example a PartDesign Body, a Std Part or an Assembly. If multiple containers are active, the datum object is added to the active container that was created first.
2. Optionally select the geometry the datum object should be attached to.
3. Press the Coordinate System button.
4. The Attachment task panel opens.
5. If no geometry has been selected: optionally press the OK button to finish the command without attaching the datum object.
6. For further steps see Part EditAttachment. Continue from step 7 on that page if geometry has been preselected.

Notes

• A datum object can also be put into a container by dropping it on the container in the Tree View.
• The attachment of a datum object can be changed by editing its DataMap Mode property. See Part EditAttachment.
• The Part DatumPlane and Part DatumLine objects, and the planes and axes of the Part CoordinateSystem object are infinite.

Properties

See also: Property View.

A Part LCS object, formally a Part::LocalCoordinateSystem object, is derived from an App::LocalCoordinateSystem object. All its properties are inherited except those listed under Attachment.

Data

Attachment

The object has the same attachment properties as a Part Part2DObject.

Base

• Data (hidden)Origin Features (LinkList): The axes, planes and origin point controlled by the coordinate system.
• DataPlacement (Placement): See Part Feature.
• DataLabel (String): Idem.
• Data (hidden)Label2 (String): Idem.
• Data (hidden)Expression Engine (ExpressionEngine): Idem.
• Data (hidden)Visibility (Bool): Idem.
• DataGroup (LinkList):
• Data (hidden)_ Group Touched (Bool):

View

Display Options

• ViewDisplay Mode (Enumeration): See Part Feature.
• ViewShow In Tree (Bool): Idem.
• ViewVisibility (Bool): Idem.

Selection

• ViewOn Top When Selected (Enumeration): See Part Feature.
• ViewSelection Style (Enumeration): Idem.

Scripting

import FreeCAD as App

doc = App.newDocument()

body = doc.addObject("PartDesign::Body", "Body")
lcs = doc.addObject("Part::LocalCoordinateSystem", "LCS")
lcs.Visibility = True
body.addObjects([lcs])

orig = body.Origin
plane = next(f for f in orig.OriginFeatures if f.Role == "XZ_Plane")
lcs.AttachmentSupport = [(orig, (plane.Name + ".", ))]
lcs.AttachmentOffset = App.Placement(App.Vector(), App.Vector(1, 0, 0), 45)
lcs.MapMode = "FlatFace"

doc.recompute()

Part

Part DatumPlane

Std Base