Select only/all faces of object?

[danielfalck]

This might not be what you are looking for, but to parse the object and make a list of just the faces on it, try this:

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from FreeCADGui import Selection

obj=Selection.getSelection()[0].Shape
faces = []
for f in obj.Faces:
    faces.append(f)

[andre]

Here where I get stumped:

selface = FreeCADGui.Selection.getSelectionEx()
for i in selface: #reselect items / faces again
FreeCADGui.Selection.removeSelection(App.ActiveDocument.getObject(i.ObjectName)) <-- works fine to select an entire object
FreeCADGui.Selection.addSelection(App.ActiveDocument.getObject(i.SubElementNames[0])) <-- returns error when trying to select just a face

Error received: <type 'exceptions.TypeError'>: argument 1 must be App.DocumentObject, not None

[wmayer]

To add a single element to the selection:

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Gui.Selection.addSelection(App.ActiveDocument.Box,"Face1")

To get a list of selected sub-elements of an object:

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s=Gui.Selection.getSelectionEx()[0]
s.SubObjects

[Roland]

Dear Forum,

Has this issue ever been elaborated?
I have the same problem: A very complicated object with lots of internal faces that I want to get rid of, resulting in a FreeCAD model with the outside visible faces only.

My own progress sofar:
With Draft->Downgrade, I turned all solids of the model into faces. They are now with 10,000s.
To remove the internal ones by View->ClippingPlane, Select and Delete is no practicable solution, given the magnitude of faces.
An option could be to manually select the visible faces and copy them into a new document.

However, I did not find a FreeCAD tool to select visible faces only. E.g. Edit->Box Selection selects every face behind the selection window, including the invisible ones.

How to tackle this challenge?

Best regards,

Roland

[TheMarkster]

If you can create an object that contains the centers of mass of the desired faces within its BoundBox this macro will select those faces.

Usage: select the object to serve as the bounding box. Cubes work best because the boundbox is the same as the cube. You should make the cube invisible so you can see better which faces the macro has selected. Run the macro.

In this image I have a cube inside a cut object made from cutting one prism from another. The cut is partially transparent to better show the position of the cube.

Snip macro screenshot-1eaa89.png (87.47 KiB) Viewed 1824 times

In this image I made the cube invisible and ran the macro.

Snip macro screenshot-86489a.png (83.7 KiB) Viewed 1824 times

[Roland]

Dear Markster,

I tested your example. Does the job as explained. Nice work!

Next step for me: to make it work on my model. Shall report.

Thanks a lot!

Roland

[Roland]

OK, Markster,

It is a temporary answer to my question. With your macro (Thanks!) I can select de internal faces of certain object types (not of all, see below).

My goal is to be able to end up with the external faces only. So, with your macro, I can select internal faces. Subsequently I can delete them. Note that Delete does remove everything belonging to the selected face. If that is a solid, the entire solid is deleted, including its external faces (which are to be kept). That implies that indeed (as I did already) I need to Downgrade all solids into faces, in order to keep the external faces.

This approach using your macro is not suitable for cylindrical objects, as the centre of mass of the surrounding external face is also inside the bounding box used for selection.

Best regards,

Roland

[mario52]

Hi

other idea : Select all faces in active view

or here Macro Select Hovering (select face or point or edge without click mouse) after use Part_ElementCopy for create the faces

mario

[Roland]

Dear Mario,

Thanks for your suggestions. I tried the Select Hovering. The principle works. However, it turned out to be too much manual labour.

It appeared that preparing hollow parts and recombining them by A2+ WB was a lot less laborious.
(still several hours, so it might be worthwhile to prepare a tool or macro, if it is a more general need)

Best regards,

Roland

[mario52]

Hi

tray Selecting adjacent surfaces (only the faces adjacent of the selected object is considered and one shell with the faces is created)

if you have one error in line 1 , replace the line by :

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shape = FreeCADGui.Selection.getSelection()[0].Shape

mario