Part Loft: Difference between revisions

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<!--T:32-->
{{Docnav
|[[Part_RuledSurface|RuledSurface]]
|[[Part_Sweep|Sweep]]
|[[Part_Workbench|Part]]
|IconL=Part_RuledSurface.svg
|IconR=Part_Sweep.svg
|IconC=Workbench_Part.svg
}}


<!--T:2-->
This will be the wiki page for Part_Loft
{{GuiCommand
|Name=Part Loft
|MenuLocation=Part → Loft...
|Workbenches=[[Part_Workbench|Part]]
|Version=0.13
|SeeAlso=[[Part_Sweep|Part Sweep]]
}}


==Description== <!--T:44-->
[[File:Part_Loft.png]]


<!--T:45-->
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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{{GuiCommand|Name=Part_Loft|MenuLocation=Part -> Loft...||Workbenches=[[Part_Module|Part]]|SeeAlso=[[Part_Sweep|Part_Sweep]]}}
[[File:Part_Loft_solid_ruled_from3profiles_example_FreeCAD_0_13.jpg|400px]]
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<!--T:61-->
{{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== <!--T:46-->


<!--T:47-->
==Overview==
# There are several ways to invoke the command:
#* Press the {{Button|[[Image:Part_Loft.svg|16px]] [[Part_Loft|Loft...]]}} button.
#* Select the {{MenuCommand|Part → [[Image:Part_Loft.svg|16px]] Loft...}} option from the menu.
# The Loft [[Task_panel|task panel]] opens.
# 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.
# Repeat for the second profile and again if more than two profiles are desired.
# Optionally use the up and down arrows to reorder the selected profiles.
# Define options [[#Data|Create solid]], [[#Data|Ruled surface]], and [[#Data|Closed]].
# Click {{Button|OK}}.


===Accepted geometry=== <!--T:48-->
The loft tool of two lines or polylines can be created a continuous surface. Requirement are two similar line trains, either both "open" as Lines or both "closed" for example Circles. The lines / lines can be present as'' Sketch'' or'' draft''.


<!--T:3-->
The Loft has two parameters, "Ruled" and "Solid", each with a value of either "true" or "false".
* '''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.


<!--T:38-->
If "Ruled" 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.]
* [[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-->
If "Solid" is "true" FreeCAD creates a solid, if "false" FreeCAD creates a face or faces.


====Create solid==== <!--T:55-->


<!--T:6-->
[[File:Part_Loft_solid_ruled_from3profiles_example_FreeCAD_0_13.jpg]]
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==== <!--T:56-->
==Use==
Access is via the menu molding -> freeform surface (in the status bar and in the "balloon help" is "Loft tool" is displayed) or by Ikon.


<!--T:5-->
[[Image:Part_Loft_Ikon_Ballon_Hilfe.png]]
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==== <!--T:57-->
In the "Tasks" will be two lists: "node / wire" and "free form".


<!--T:7-->
[[Image:Part_Loft_Liste3.png]]
If "Closed" is "true" FreeCAD attempts to loft the last profile to the first profile to create a closed loop.


<!--T:29-->
===Selection of the elements===
For more information on how profiles are joined together see [[Part_Loft_Technical_Details|Part Loft Technical Details]].
In the "node / wire" the available items are displayed. Two elements must be selected one after the first in this list.


==Properties== <!--T:49-->
[[Image:Part_Loft_Liste_Auswahl_3b.png]]


<!--T:50-->
Thereafter, with the blue arrow that item is added to the list of "free form".
See also: [[Property_editor|Property editor]].


<!--T:51-->
[[Image:Part_Loft_Liste_Auswahl_3c.png]]
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=== <!--T:52-->
The selected items must be of the same type, so .


<!--T:53-->
Tip: the active / selected items in the list are displayed in the 3D area as active / selected.
{{TitleProperty|Loft}}


<!--T:54-->
===command complete===
* {{PropertyData|Sections|LinkList}}: lists the sections used.
If both elements are selected, the command can be completed with "OK".
* {{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.


==Limitations== <!--T:39-->
[[Image:Part_Loft_Liste_Auswahl_3d.png]]


<!--T:58-->
==result==
A Part Loft has the same limitations as a [[Part_Sweep#Limitations|Part Sweep]].
From closed lines arise surfaces which might be taken at a superficial look for solids / solids.


=== Closed Lofts === <!--T:59-->
[[Image:Part_Loft_geschlossen.png]]


<!--T:10-->
If indeed a solid / solid to be created, can be used either when you create the button "Create Solid" or after creating the field'' properties'' tab'' data'' created the free-form surface of the switch "Solid" by pop be set to "true" / set properly.
* 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.


The procedure is analogous open polylines.


<!--T:33-->
==FreeCAD Version==
{{Docnav
Version 0.13
|[[Part_RuledSurface|RuledSurface]]
|[[Part_Sweep|Sweep]]
|[[Part_Workbench|Part]]
|IconL=Part_RuledSurface.svg
|IconR=Part_Sweep.svg
|IconC=Workbench_Part.svg
}}


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{{Part Tools navi{{#translation:}}}}
{{languages | {{en|Part Loft}} {{de|Part Loft - Freiformfläche}} {{it|Part Loft/it}}}}
{{Userdocnavi{{#translation:}}}}

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.