Sketcher tutorial

A place to share learning material: written tutorials, videos, etc.
chrisb
Posts: 13410
Joined: Tue Mar 17, 2015 9:14 am

Re: Sketcher tutorial

Postby chrisb » Fri Jan 18, 2019 7:43 pm

Thank you very much.
B-splines are at the bottom of the left table, conics have to be addded.
dxp.dev
Posts: 45
Joined: Tue Dec 11, 2018 12:57 pm

Re: Sketcher tutorial

Postby dxp.dev » Mon Jan 21, 2019 5:08 pm

Could we see that tutorial on the Tutorial page of the FC site (https://www.freecadweb.org/wiki/Tutorials/en) ?
chrisb
Posts: 13410
Joined: Tue Mar 17, 2015 9:14 am

Re: Sketcher tutorial

Postby chrisb » Mon Jan 21, 2019 5:50 pm

It's not there because it doesn't really fit the wiki tutorials format yet.
chrisb
Posts: 13410
Joined: Tue Mar 17, 2015 9:14 am

Re: Sketcher tutorial

Postby chrisb » Fri Feb 22, 2019 4:39 pm

In the tutorial I write about the grid in Sketcher:
The grid For now open the ”Edit controls” and uncheck the ”Show grid” checkbox. The grid is only helping to place geometric elements. If you have ”Grid snap” enabled it suggests that snapped points have their positions already defined, which in fact they have not. So I prefer to have it switched off to avoid confusion.
In the comments on the document opeBrain writes about the second sentence
openBrain wrote: This sentence is quite unclear to me.
I am unsure how to express the fact, that unlike other 2D programs the snapping does not define a point to stay at its snapping point, no constraints are created.

I hope for some clarifying words from the community.
openBrain
Posts: 272
Joined: Fri Nov 09, 2018 5:38 pm

Re: Sketcher tutorial

Postby openBrain » Fri Feb 22, 2019 7:18 pm

chrisb wrote:
Fri Feb 22, 2019 4:39 pm
I am unsure how to express the fact, that unlike other 2D programs the snapping does not define a point to stay at its snapping point, no constraints are created.
Hi chrisb,
As I'm responsible for trouble, and now I clearly understand what you expect, please let me have a try. :)
I would like this sentence :

Code: Select all

If you have ”Grid snap” enabled it suggests that snapped points have their positions already defined, which in fact they have not.
to be something like

Code: Select all

If you have "Grid snap" enabled, you may think that points will be permanently locked on the grid-points where they was dropped on, while actually they won't.
HTH
GeneFC
Posts: 940
Joined: Sat Mar 19, 2016 3:36 pm
Location: Punta Gorda, FL

Re: Sketcher tutorial

Postby GeneFC » Fri Feb 22, 2019 8:25 pm

OB,

I think you are missing the point. It does not matter where the points actually exist. If one uses grid snap the two points will be in exactly the same place.

The important point is that those two points are not linked as "coincident" unless that constraint is specifically applied.

Location and coincidence are two different concepts in the Sketcher.

Gene
openBrain
Posts: 272
Joined: Fri Nov 09, 2018 5:38 pm

Re: Sketcher tutorial

Postby openBrain » Fri Feb 22, 2019 8:39 pm

GeneFC wrote:
Fri Feb 22, 2019 8:25 pm
I think you are missing the point.
ATM I don't think so. :) chrisb has worded it as "the snapping does not define a point to stay at its snapping point", which I tried to reword the way I would have like to read it. ;)
But I may be wrong. In this case, I'm pretty sure chrisb will complain about my reply. :lol:
GeneFC
Posts: 940
Joined: Sat Mar 19, 2016 3:36 pm
Location: Punta Gorda, FL

Re: Sketcher tutorial

Postby GeneFC » Fri Feb 22, 2019 10:03 pm

I agree the wording could be cleaned up a bit.

However, the concept that causes confusion on the forum, again and again, is that somehow overlapping position means there is a connection. I believe in some programs and even other parts of FreeCAD snapping means connection. In sketcher it does not.

In ordinary life, overlap and coincidence are the same thing. In FreeCAD sketcher they are not the same.

Gene