Sketcher External: Difference between revisions

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{{Docnav
|[[Sketcher_Extend|Extend]]
|[[Sketcher_CarbonCopy|Carbon copy]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_Extend.svg
|IconR=Sketcher_CarbonCopy.svg
|IconC=Workbench_Sketcher.svg
}}

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{{GuiCommand
{{GuiCommand|Name=Sketcher_External|Workbenches=[[Sketcher Workbench|Sketcher]], [[PartDesign Workbench|PartDesign]]|Shortcut=E|MenuLocation=Sketch → Sketcher geometries → Sketcher External|SeeAlso=[[Sketcher_ConstructionMode|ConstructionMode]]}}
|Name=Sketcher External
|MenuLocation=Sketch → Sketcher geometries → Create external geometry
|Workbenches=[[Sketcher_Workbench|Sketcher]]
|Shortcut={{KEY|G}} {{KEY|X}}
|SeeAlso=[[Sketcher_ToggleConstruction|Sketcher ConstructionMode]]
}}


==Description== <!--T:2-->
==Description== <!--T:2-->


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The [[Image:Sketcher_External.svg|24px]] [[Sketcher_External|Sketcher External]] tool projects edges and/or vertices belonging to objects outside the sketch onto the sketch plane. The projected geometry is called "external geometry". It stays parametrically linked to its source objects. External geometry edges are marked with a dedicated [[Sketcher_Preferences#Appearance|color]] (default magenta) and ({{Version|0.22}}) linetype. Similar to construction geometry, external geometry is not visible outside the sketch, it is intended to help define constraints and other geometry inside the sketch itself.
This tool pulls solid line geometry into your current sketch. Once these lines are pulled in, they will appear as magenta lines in the current sketch, and you can constrain and dimension sketch curves to them.


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[[Image:Sketcher_ExternalEsempio1.png]]
This is useful because it lets you constrain you sketch back to nearby solid edges.
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{{Caption|The two magenta lines are external geometry linked to edges of a pre-existing [[PartDesign_Pad|Pad]]. They are used to constrain the circles.}}


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==Usage== <!--T:8-->
You can ONLY pull in lines and edges that are on the same plane as the sketch plane.
Only solid lines/edges can be pulled into the sketch, NOT 2D sketches or draft lines.


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See also: [[Sketcher_Workbench#Drawing_aids|Drawing aids]].
[[FILE:Sketcher_ExternalEsempio1.png]]


==Use== <!--T:8-->
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# There are several ways to invoke the tool:
* Start a sketch on face of a solid (Click on the solid face, then click the create sketch button)
#* Press the {{Button|[[Image:Sketcher_External.svg|16px]] [[Sketcher_External|Create external geometry]]}} button.
* Click the 'Sketcher External' button
#* Select the {{MenuCommand|Sketcher → Sketcher geometries → [[Image:Sketcher_External.svg|16px]] Create external geometry}} option from the menu.
* Select, select the solid line that you want to pull into the sketch (remember this must be on the same plane that the sketch is on)
#* Right-click in the [[3D_view|3D view]] and select the {{MenuCommand|[[Image:Sketcher_External.svg|16px]] Create external geometry}} option from the context menu.
#* Use the keyboard shortcut: {{KEY|G}} then {{KEY|X}}.
# The cursor changes to a cross with the tool icon.
# Select an external edge or a vertex. See [[#Notes|Notes]].
# External geometry is created.
# This tool always runs in continue mode: optionally keep selecting external edges and/or a vertices.
# To finish, right-click or press {{KEY|Esc}}, or start another geometry or constraint creation tool.


== Notes == <!--T:51-->
===How to Tell If It Worked ===
If the line is successfully pulled in it will have a magenta color. If it was not pulled in, it will remain green.


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===Similarity to Construction Lines===
* Only edges and vertices from objects within the same coordinate system can be selected. The sketch and the object must be in same [[PartDesign_Body|Body]], or the same [[Std_Part|Part]], or both in the global coordinate system. Use a [[PartDesign_SubShapeBinder|Binder]] to bring a copy of the object into the current coordinate system if required.
External geometry magenta lines can be used like [[Sketcher_ConstructionMode|Contruction lines]].
* Circular dependencies are not allowed. You cannot link to an object that depends on the sketch itself.
Construction lines are lines that are internal to the sketch and will be used for constructing geometry only, and not for later solid operations, like extrusions.
* Links to elements from other sketches are possible, and encouraged, as they are more reliable than links to generated (solid) geometry. The latter can suffer from the [[Topological_naming_problem|Topological Naming Problem]]. See [[Feature_editing#Advice_for_creating_stable_models|Advice for stable models]].


External geometry magenta lines can be used as construction lines too, because they will not appear as sketch lines once you exit the sketch. But remember the external geometry magenta lines are parametrically linked back to a solid face.


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===Two Main Uses Of External Lines===
{{Docnav
|[[Sketcher_Extend|Extend]]
|[[Sketcher_CarbonCopy|Carbon copy]]
|[[Sketcher_Workbench|Sketcher]]
|IconL=Sketcher_Extend.svg
|IconR=Sketcher_CarbonCopy.svg
|IconC=Workbench_Sketcher.svg
}}


There are two scenarios where you'll want to use this tool.

* Option 1: You want to add holes or extrudes(pads) to the current solid that you're sketching on
* Option 2: You want to create tool bodies that are separate from your original solid

Option 1 is the simplest option. If you want a hole at a specific location in an object, this method should be used.

Option 2 must sometimes be used. If I need to subtract away multiple cutting bodies then I need those bodies to be separate from my original solid. In that case I will need to extrude my sketch to make a new separate solid, then use clone or rotate or array to make a bunch of parametric copies of it.
:If I'm working with sketches, only individual sketches can be extruded or padded.
:Extruding will create a new solid body. The pad or pocket tool will use the sketch to alter your original solid.

*Option 1 use pad or pocket to alter your solid, adding metal or making holes.
*Option 2, use extrude to make your tool solid, then duplicate it with the above methods, and add or subtract it from your original solid.

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One can use this to dimension one sketch off of another using the following order of operations:
#Make sketch#1
#Pad or extrude it to make a solid, solid#1
#Make sketch#2 on the same plane as sketch#1
#Pull in solid#1 lines into sketch#2
#Pad or extrude sketch#2 to make solid#2

==Example== <!--T:11-->

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The magenta lines are External Geometry selected on two objects of the same extrusion products with previous sketch.
In this case they are used to create the constraints of tangency with the circumferences.
The line on the smaller rectangle is not used.
[[FILE:Sketcher_ExternalEsempio2.png]]
The active sketch with the basic forms hidden and external geometries visible.

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[[FILE:Sketcher_ExternalEsempio4.png]]
When the sketch is closed, External Geometry lines are not visible.
[[FILE:Sketcher_ExternalEsempio3.png]]
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Latest revision as of 09:32, 18 April 2024

Other languages:

Sketcher External

Menu location
Sketch → Sketcher geometries → Create external geometry
Workbenches
Sketcher
Default shortcut
G X
Introduced in version
-
See also
Sketcher ConstructionMode

Description

The Sketcher External tool projects edges and/or vertices belonging to objects outside the sketch onto the sketch plane. The projected geometry is called "external geometry". It stays parametrically linked to its source objects. External geometry edges are marked with a dedicated color (default magenta) and (introduced in version 0.22) linetype. Similar to construction geometry, external geometry is not visible outside the sketch, it is intended to help define constraints and other geometry inside the sketch itself.

The two magenta lines are external geometry linked to edges of a pre-existing Pad. They are used to constrain the circles.

Usage

See also: Drawing aids.

  1. There are several ways to invoke the tool:
    • Press the Create external geometry button.
    • Select the Sketcher → Sketcher geometries → Create external geometry option from the menu.
    • Right-click in the 3D view and select the Create external geometry option from the context menu.
    • Use the keyboard shortcut: G then X.
  2. The cursor changes to a cross with the tool icon.
  3. Select an external edge or a vertex. See Notes.
  4. External geometry is created.
  5. This tool always runs in continue mode: optionally keep selecting external edges and/or a vertices.
  6. To finish, right-click or press Esc, or start another geometry or constraint creation tool.

Notes

  • Only edges and vertices from objects within the same coordinate system can be selected. The sketch and the object must be in same Body, or the same Part, or both in the global coordinate system. Use a Binder to bring a copy of the object into the current coordinate system if required.
  • Circular dependencies are not allowed. You cannot link to an object that depends on the sketch itself.
  • Links to elements from other sketches are possible, and encouraged, as they are more reliable than links to generated (solid) geometry. The latter can suffer from the Topological Naming Problem. See Advice for stable models.


Sketcher
User documentation
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