Part Ellipsoid: Difference between revisions
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A [[Image:Part_Ellipsoid.svg|24px]] [[Part_Ellipsoid|Part Ellipsoid]] is a parametric solid that can be created with the [[Image:Part_Primitives.svg|24px]] [[Part_Primitives|Part Primitives]] command. In the coordinate system defined by its {{PropertyData|Placement}} property, the axes of the ellipsoid are aligned with the X, Y and Z axes, and therefore its center is positioned at the origin. |
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A Part Ellipsoid can be truncated at the top and/or bottom by changing its {{PropertyData|Angle1}} and/or {{PropertyData|Angle2}} properties. It can be turned into a segment of an ellipsoid by changing its {{PropertyData|Angle3}} property. |
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FreeCAD creates an ellipsoid, which will have a circle for any cross section parallel to the XY plane. The cross section parallel to the other two planes will be an ellipse. |
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By default, the ellipsoid is positioned with its mass center at the origin (0,0,0). |
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[[Image:Part_Ellipsoid_Example.png|400px]] |
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[[File:Part Ellipsoid Example.png|Screenshot of a Part Ellipsoid with default values]] |
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== Usage == <!--T:19--> |
== Usage == <!--T:19--> |
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See [[Part_Primitives#Usage|Part Primitives]]. |
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# There are several ways to invoke the command: |
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#* Press the {{Button|[[Image:Part_Primitives.svg|16px]] [[Part Primitives|Create Primitives...]]}} button. |
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#* Select the {{MenuCommand|Part → Create Primitives → [[Image:Part_Primitives.svg|16px]] Create Primitives...}} option from the menu. |
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#* Select the {{MenuCommand|[[Image:Part_Ellipsoid.svg|16px]] Ellipsoid}} option from the menu. |
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# Set options and press {{Button|Create}}. |
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# To close the dialog press {{Button|Close}}. |
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== Example == |
== Example == |
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[[ |
[[Image:Part_Ellipsoid_Scripting_Example.png|thumb|Part Ellipsoid from the scripting example]] |
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A Part Ellipsoid object with the |
A Part Ellipsoid object created with the [[#Scripting|scripting example]] below is shown here. |
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== Notes == |
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The shape produced is limited in FreeCAD to being a solid (optionally truncated) spheroid, the shape you would create by rotating an ellipse around one of its axis. By default it is a [http://en.wikipedia.org/wiki/Oblate_spheroid Oblate Spheroid], the shape you would create by rotating an ellipse around its minor axis. The parameters can be changed to form a [http://en.wikipedia.org/wiki/Prolate_spheroid Prolate Spheroid]. |
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In mathematics, an [http://en.wikipedia.org/wiki/Ellipsoid Ellipsoid] would have an elliptical cross section in all three planes. |
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== Properties == <!--T:3--> |
== Properties == <!--T:3--> |
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=== Data === |
=== Data === |
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{{TitleProperty|Attachment}} |
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The object has the same attachment properties as a [[Part_Part2DObject#Data|Part Part2DObject]]. |
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{{TitleProperty|Ellipsoid}} |
{{TitleProperty|Ellipsoid}} |
Revision as of 08:38, 2 March 2022
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Part Ellipsoid |
Menu location |
---|
Part → Create primitives → Ellipsoid |
Workbenches |
Part, OpenSCAD |
Default shortcut |
None |
Introduced in version |
- |
See also |
Part Create primitives |
Description
A Part Ellipsoid is a parametric solid that can be created with the Part Primitives command. In the coordinate system defined by its DataPlacement property, the axes of the ellipsoid are aligned with the X, Y and Z axes, and therefore its center is positioned at the origin.
A Part Ellipsoid can be truncated at the top and/or bottom by changing its DataAngle1 and/or DataAngle2 properties. It can be turned into a segment of an ellipsoid by changing its DataAngle3 property.
Usage
See Part Primitives.
Example
A Part Ellipsoid object created with the scripting example below is shown here.
Properties
See also: Property editor.
A Part Ellipsoid object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:
Data
Attachment
The object has the same attachment properties as a Part Part2DObject.
Ellipsoid
- DataRadius1 (
Length
): By default the minor radius parallel to the Z-axis, - DataRadius2 (
Length
): By default the major radius parallel to the XY plane, it is also the maximum radius of the circular cross section - DataRadius3 (
Length
): By default the major radius parallel to the YZ plane, it is also the maximum radius of the angular cross section - DataAngle1 (
Angle
): Lower truncation of the ellipsoid, parallel to the circular cross section (-90 degrees in a full spheroid) - DataAngle2 (
Angle
): Upper truncation of the ellipsoid, parallel to the circular cross section (90 degrees in a full spheroid) - DataAngle3 (
Angle
): Angle of rotation of the elliptical cross section (360 degrees in a full spheroid)
Scripting
A Part Ellipsoid is created with the addObject()
method of the document.
ellipsoid = FreeCAD.ActiveDocument.addObject("Part::Ellipsoid", "myEllipsoid")
- Where
myEllipsoid
is the name for the object. The name must be unique for the entire document. - The function returns the newly created object.
The Label
is the user editable name for the object. It can be easily changed by
ellipsoid.Label = "new myEllipsoidName"
You can access and modify attributes of the ellipsoid
object. For example, you may wish to modify the three radii and the three angles of the ellipsoid.
ellipsoid.Radius1 = 2
ellipsoid.Radius2 = 4
ellipsoid.Radius3 = 6
ellipsoid.Angle1 = -90
ellipsoid.Angle2 = 50
ellipsoid.Angle3 = 300
The result will be a part of an ellipsoid.
You can change its placement and orientation with:
ellipsoid.Placement = FreeCAD.Placement(FreeCAD.Vector(1, 2, 3), FreeCAD.Rotation(15, 0, 20))
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