Sketcher Lecture

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CRMS
Posts: 27
Joined: Sat Nov 14, 2020 1:10 pm

Sketcher Lecture

Postby CRMS » Sun Nov 22, 2020 10:22 pm

I've been reading the comprehensive document before working through the many exercises. I'm wondering what the advantages or disadvantages are of creating the sketch inside a body as described at para 1.2??
chrisb
Posts: 30868
Joined: Tue Mar 17, 2015 9:14 am

Re: Sketcher Lecture

Postby chrisb » Sun Nov 22, 2020 10:32 pm

If you look at the dependency graph, you see that sketches created in PartDesign are placed inside of the active body. They get an AttachmentPlacement and are attached to a plane inside of the body.
Sketches created in Sketcher are outside of all bodies.
I will check the lecture and add this information.
You need at least FreeCAD 0.19.23300 to edit my current sketches.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
CRMS
Posts: 27
Joined: Sat Nov 14, 2020 1:10 pm

Re: Sketcher Lecture

Postby CRMS » Mon Nov 23, 2020 8:26 am

Yes, understand inside/outside depending on sketcher used.
But why choose one way over the other?? What is the benefit of each??
openBrain
Posts: 5215
Joined: Fri Nov 09, 2018 5:38 pm

Re: Sketcher Lecture

Postby openBrain » Mon Nov 23, 2020 9:01 am

That's all about workflow.
If your sketch is outside a body, you must work with the CSG method (Part workbench).
If your sketch is inside a body, you must work with the feature editing method (PartDesign workbench).
Opposite assertions are true also : if you want to use the xxx method, your sketch must be xxxside a body.
jmaustpc
Posts: 10565
Joined: Tue Jul 26, 2011 6:28 am
Location: Australia

Re: Sketcher Lecture

Postby jmaustpc » Mon Nov 23, 2020 10:35 am

CRMS wrote:
Mon Nov 23, 2020 8:26 am
Yes, understand inside/outside depending on sketcher used.
But why choose one way over the other?? What is the benefit of each??
Its as simple as this, if you are PartDesign workbench then the sketch must be inside a body, but sketches can be used in many official and add-on workbenches, where most will not use the Body object.

As openbrain said, there is Part WB but also Arch wb, surfaces WB, etc., these other workbenches can have many different work flows and use the sketches for different things and in different ways.