How to reference document/global properties?

[kisolre]

The question is how to access property "BearingInnerDiameter" under the group "DIMS" from the properties of the file "MyModel.FCStd" (current file) in an expression. What is the name of the freecad object that represents the file, in which any other object is inside?

[PAS_Drafter]

Well, I didn't even know this tool DynamicData Workbench existed until I read this post. This is another great tool from FreeCAD!

The documentation shows how to use it.

https://github.com/mwganson/DynamicData ... /README.md

I was able to make a quick file using it attached. You create the DynamicData object and then can access it just like you do a spreadsheet.

[naasking]

Thanks I'll look into DynamicData. Is there a reason why Spreadsheet is so slow? It seems like it might be recomputing everything whenever something changes, rather than only the dependencies on what changed.

[drmacro]

... It seems like it might be recomputing everything whenever something changes, rather than only the dependencies on what changed.

Exactly.

[adrianinsaval]

DynamicData isn't any different on that regard AFAIk, if you stuff that is fully independent and shouldn't trigger a recompute of some stuff you might need to create several containers/spreadsheets.

[naasking]

DynamicData seems to work when you're setting up the properties, but I can't seem to do any arithmetic on them in expressions. For instance, I setup a property of type App::PropertyLength, and if I try to use this in an expression with an offset I get "unit mismatch in minus operation":

Gear diameter.png (22.91 KiB) Viewed 389 times

It only seems to work if I specify the type as "PropertyFloat".

[Shalmeneser]

Code: Select all

... - 1 mm

Unit mismatch !

[onekk]

expression with an offset I get "unit mismatch in minus operation":

Well known behaviour, you must specify a unit when adding or subtracting.

Regards

Carlo D.