Create and display local coordinate system

[Zolko]

BTW, try:

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App.ActiveDocument.addObject('App::Placement')

It's a CS frame. But it's not useful, because nothing supports it.

Holy cow, the LCS feature already exists !!!

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App.activeDocument().Body.newObject('PartDesign::CoordinateSystem','LCS')

And it looks like an LCS (no arrowheads though, visually it's defined in ~/src/Mod/PartDesign/Gui/ViewProviderDatumCS.cpp), it's selectable, it highlights in the 3D window ... don't know whether it's used though. And I don't know why the creation of datum coordinate systems has not a corresponding button, although there is an icon for it : "PartDesign_CoordinateSystem.svg"

[saso]

And one can actually place datum elements outside the body!

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App.ActiveDocument.addObject('PartDesign::Plane')
App.ActiveDocument.addObject('PartDesign::Point')
App.ActiveDocument.addObject('PartDesign::CoordinateSystem')

Now if only things would not be jumping out of the Part all the time...

[DeepSOIC]

And it looks like an LCS (no arrowheads though, visually it's defined in ~/src/Mod/PartDesign/Gui/ViewProviderDatumCS.cpp), it's selectable, it highlights in the 3D window ... don't know whether it's used though.

Nice catch. I wanted to show that one too, but couldn't find it.

It was used for attaching PartDesign primitives back in the early days of 0.17dev. Then, ickby invented Extension mechanism for creating chunks of re-usable functionality, and PD Primitives now use extension-powered attachment directly, and don't need the CS object.
Otherwise, I don't know if this PartDesign::CoordinateSystem is supported by anything.

[saso]

Soooo close to heaven... Elements from Part WB (Sketch, Extrude) and elements from PartDesign WB (Body, Sketch001, Pad) all driven by the same datum plane (PartDesign__Plane)

[Zolko]

Otherwise, I don't know if this PartDesign::CoordinateSystem is supported by anything.

well well well, its time could come : there is my pet problem of making assemblies without constraints, where parts are placed by snapping their respective LCS. Ne messing with parallelisms, concentricities, tangencies.... pure rigid attachment. An LCS might not be the origin (0,0,0), and a part (body) might have several potential attachment points, thus several LCS. Think about a wheel, that could be attached on its axis on either side: needs 2 LCS, and the attachment LCS is selected during assembly.

see @ forum: https://forum.freecadweb.org/viewtopic.php?f=20&t=32843

[saso]

Also axis to axis transform, no problem
https://www.youtube.com/watch?v=7-p5lHGIl8A

cs transform.FCStd

(16.87 KiB) Downloaded 29 times

In the animation below I am selecting the datum plane and changing its map mode, but it is possible to do much much more...

GIF.gif (63.22 KiB) Viewed 953 times

[Zolko]

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App.activeDocument().Body.newObject('PartDesign::CoordinateSystem','LCS')

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App.ActiveDocument.addObject('PartDesign::CoordinateSystem')

you're right, that's better, it doesn't need any Body object. It doesn't need any Part object either ... actually, you can add this to any active document. Even better if you name it:

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App.ActiveDocument.addObject('PartDesign::CoordinateSystem','LCS_1')

[saso]

CoordinateSystem seems functional and usable to me, can it be added to the gui? Please At least as the other datum elements in the Part Design to be used in the Body... BUT! What I would find even much much better is if all of them (point, line, plane, cs) would be changed so that they can be used generally (not just in Body), as demonstrated above, and the icons moved from the Part Design Helper toolbar, next to the Part and Group icons in the Structure toolbar

[Zolko]

CoordinateSystem seems functional and usable to me, can it be added to the gui? Please At least as the other datum elements in the Part Design to be used in the Body

I agree, and this should be done for the 0.18 release

. BUT! What I would find even much much better is if all of them (point, line, plane, cs) would be changed so that they can be used generally (not just in Body), as demonstrated above, and the icons moved from the Part Design Helper toolbar, next to the Part and Group icons in the Structure toolbar

This can wait for after 0.18 I think

[DeepSOIC]

CoordinateSystem seems functional and usable to me, can it be added to the gui? Please

BTW, can you list a few actual uses for it?
EDIT: 1. the project above, where stuff is attached to the LCS.

If we are going for it, we at least should provide some compatibility, I think.