Part Loft: Difference between revisions

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==Description==
==Description== <!--T:44-->


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The [[Image:Part_Loft.svg|24px]] [[Part_Loft|Part Loft]] command creates a face, a shell, or a solid shape from two or more profiles (cross-sections).
The [[Image:Part_Loft.svg|24px]] [[Part_Loft|Part Loft]] command creates a face, a shell, or a solid shape from two or more profiles (cross-sections).


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[[File:Part_Loft_solid_ruled_from3profiles_example_FreeCAD_0_13.jpg]]
[[File:Part_Loft_solid_ruled_from3profiles_example_FreeCAD_0_13.jpg|400px]]
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{{Caption|Part Loft from three profiles which are two [[Part_Circle|Part Circles]] and one [[Part_Ellipse|Part Ellipse]]. Parameters are Solid "True" and Ruled "True".}}
{{Caption|Loft from three profiles which are two [[Part_Circle|Part Circles]] and one [[Part_Ellipse|Part Ellipse]]. Parameters are Solid "True" and Ruled "True".}}


==Usage==
==Usage== <!--T:46-->


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# There are several ways to invoke the command:
# There are several ways to invoke the command:
#* Press the {{Button|[[Image:Part_Loft.svg|16px]] [[Part_Loft|Loft...]]}} button.
#* Press the {{Button|[[Image:Part_Loft.svg|16px]] [[Part_Loft|Loft...]]}} button.
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# Click {{Button|OK}}.
# Click {{Button|OK}}.


===Accepted geometry===
===Accepted geometry=== <!--T:48-->


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* '''Profiles:''' can be a point (vertex), line (Edge), wire or face. Edges and wires may be either open or closed. There are various [[Part_Loft#Limitations_and_complications|Limitations and complications]], see below, however the profiles may come from [[Part_Workbench|Part Workbench primitives]], [[Draft_Workbench|Draft Workbench objects]] and [[Sketcher_Workbench|Sketches]].
* '''Profiles:''' can be a point (vertex), line (edge), wire or face. Edges and wires may be either open or closed. There are various [[#Limitations|Limitations]], see below.

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* [[App_Link|App Link]] objects linked to the appropriate object types and [[App_Part|App Part]] containers with the appropriate visible objects inside can also be used as profiles. {{Version|0.20}}
* [[App_Link|App Link]] objects linked to the appropriate object types and [[App_Part|App Part]] containers with the appropriate visible objects inside can also be used as profiles. {{Version|0.20}}


==Options== <!--T:60-->
==Properties==


====Create solid==== <!--T:55-->
See also: [[Property_editor|Property editor]].

A Part Loft object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It also has the following additional properties:

===Data===

{{TitleProperty|Loft}}

* {{PropertyData|Sections|LinkList}}: lists the sections used.
* {{PropertyData|Solid|Bool}}: true or false (default). True creates a solid.
* {{PropertyData|Ruled|Bool}}: true or false (default). True creates a ruled surface.
* {{PropertyData|Closed|Bool}}: rue or false (default). True creates a closed loft by connecting last to first profile.
* {{PropertyData|Max Degree|IntegerConstraint}}: Maximum degree.

====Create solid====


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If "Create solid" is "true" FreeCAD creates a solid if the profiles are of closed geometry, if "false" FreeCAD creates a face or (if more than one face) a shell for either open or closed profiles.
If "Solid" is set to "true", FreeCAD creates a solid, provided the profiles are closed; if set to "false", FreeCAD creates a face or a shell for either open or closed profiles.


====Ruled surface====
====Ruled surface==== <!--T:56-->


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If "Ruled surface" is "true" FreeCAD creates a face, faces or a solid from ruled surfaces. [http://en.wikipedia.org/wiki/Ruled_surface Ruled surface page on Wikipedia.]
If "Ruled surface" is "true" FreeCAD creates a face, a shell or a solid from [http://en.wikipedia.org/wiki/Ruled_surface ruled surfaces].


====Closed====
====Closed==== <!--T:57-->


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If "Closed" is "true" FreeCAD attempts to loft the last profile to the first profile to create a closed figure.
If "Closed" is "true" FreeCAD attempts to loft the last profile to the first profile to create a closed loop.


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For more info on how the profiles are joined together, refer [[Part_Loft_Technical_Details|Part Loft Technical Details]] page.
For more information on how profiles are joined together see [[Part_Loft_Technical_Details|Part Loft Technical Details]].


==Limitations and complications== <!--T:39-->
==Properties== <!--T:49-->


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See also: [[Property_editor|Property editor]].
===Vertex or point===


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A vertex or point may only be used as the first and/or last profile in the list of profiles.<br>For example:
A Part Loft object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It also has the following additional properties:
*you can not Sweep from a circle to a point, to a ellipse.
*However you could Sweep from a point to a circle to an ellipse to another point.


===Profiles===
===Data=== <!--T:52-->
In one Loft, all profiles (lines wires etc.) must be either open or closed.<br>For example:
*FreeCAD can not Sweep between one Part Circle and one default Part Line.


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===Draft Workbench features===
{{TitleProperty|Loft}}


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Draft Workbench features can be directly used as a profile.<br>
* {{PropertyData|Sections|LinkList}}: lists the sections used.
For example the following Draft features can be used as profiles in a Part Loft:
* {{PropertyData|Solid|Bool}}: true or false (default). True creates a solid.
*Draft Polygon.
* {{PropertyData|Ruled|Bool}}: true or false (default). True creates a ruled surface.
*Draft Point, Line, Wire,
* {{PropertyData|Closed|Bool}}: rue or false (default). True creates a closed loft by connecting last to first profile.
*Draft B-spline, Bezier Curve
* {{PropertyData|Max Degree|IntegerConstraint}}: Maximum degree.
*Draft Circle, Ellipse, Rectangle


==Limitations== <!--T:39-->
===PartDesign Sketches===


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*The profile may be created with a sketch. However only a valid sketch will be shown in the list to be available for selection.
A Part Loft has the same limitations as a [[Part_Sweep#Limitations|Part Sweep]].
*The sketch must contain only one open or closed wire or line (can be multiple lines, if those lines are all connected as they are then a single wire)


=== Closed Lofts === <!--T:59-->
===Part Workbench===

The profile can be a valid Part geometric primitive which can be created with the [[Part_Primitives|Part Primitives]] command.<br>For example the following Part geometric primitives can be a valid profile:
*Point (Vertex), Line (Edge)
*Helix, Spiral
*Circle, Ellipse
*Regular Polygon
*Plane (Face)


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* The results of a closed Loft may be unexpected, the Loft may develop twists or kinks. Lofting is very sensitive to the Placement of the profiles and the complexity of the curves required to connect the corresponding vertices in all the profiles.
=== Closed Lofts ===

* The results of closed lofts may be unexpected - the loft may develop twists or kinks. Lofting is very sensitive to the Placement of the profiles and the complexity of the curves required to connect the corresponding vertices in all the profiles.





Latest revision as of 18:01, 4 October 2023

Part Loft

Menu location
Part → Loft...
Workbenches
Part
Default shortcut
None
Introduced in version
0.13
See also
Part Sweep

Description

The Part Loft command creates a face, a shell, or a solid shape from two or more profiles (cross-sections).

Loft from three profiles which are two Part Circles and one Part Ellipse. Parameters are Solid "True" and Ruled "True".

Usage

  1. There are several ways to invoke the command:
    • Press the Loft... button.
    • Select the Part → Loft... option from the menu.
  2. The Loft task panel opens.
  3. In the Available Profiles list on the left select the first profile and click on the right arrow to place it in the Selected profiles list on the right.
  4. Repeat for the second profile and again if more than two profiles are desired.
  5. Optionally use the up and down arrows to reorder the selected profiles.
  6. Define options Create solid, Ruled surface, and Closed.
  7. Click OK.

Accepted geometry

  • Profiles: can be a point (vertex), line (edge), wire or face. Edges and wires may be either open or closed. There are various Limitations, see below.

Options

Create solid

If "Solid" is set to "true", FreeCAD creates a solid, provided the profiles are closed; if set to "false", FreeCAD creates a face or a shell for either open or closed profiles.

Ruled surface

If "Ruled surface" is "true" FreeCAD creates a face, a shell or a solid from ruled surfaces.

Closed

If "Closed" is "true" FreeCAD attempts to loft the last profile to the first profile to create a closed loop.

For more information on how profiles are joined together see Part Loft Technical Details.

Properties

See also: Property editor.

A Part Loft object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:

Data

Loft

  • DataSections (LinkList): lists the sections used.
  • DataSolid (Bool): true or false (default). True creates a solid.
  • DataRuled (Bool): true or false (default). True creates a ruled surface.
  • DataClosed (Bool): rue or false (default). True creates a closed loft by connecting last to first profile.
  • DataMax Degree (IntegerConstraint): Maximum degree.

Limitations

A Part Loft has the same limitations as a Part Sweep.

Closed Lofts

  • The results of a closed Loft may be unexpected, the Loft may develop twists or kinks. Lofting is very sensitive to the Placement of the profiles and the complexity of the curves required to connect the corresponding vertices in all the profiles.