This feature can prove to be extremely powerful once a user gets used to it. Under the hood, for those interested in the technical details, the ExpressionEngine of the Placement property of the App::Link is used to superimpose the Placement of two coordinate systems - one in the assembly and one in the inserted part - which fixes all degrees of freedom of the inserted part.Īnother particularity of Assembly 4 is that there is no difference between a part and an assembly: it's possible to mix datum objects, 2D sketches, 3D geometries and inserted parts at will.
There can be many coordinate systems in each, and the user can choose which of these coordinate systems - in the assembly and in the part - shall be used. The particularity of Assembly 4 is that the placement of the inserted (linked) part is done by matching corresponding coordinate systems in the parent assembly and in the linked part: therefore, there must be at least 1 coordinate system in the assembly and at least 1 in the part. In other words, this is identical what other CAD systems do when speaking of assembly.
This allows to create many instances of the same object without any overhead, allowing the creation of large assemblies. The advantage of App::Link feature is that it's possible to link FreeCAD objects between files, seamlessly: a model in a file will appear in the tree of another model in another file, but the data is not copied across. The basic principle is the one from assembly without solver: FreeCAD's App::Part container serve as basic building blocs, that are inserted into each other using the App::Link interface introduced with FreeCAD 0.19. This thread starter will be updated if new versions of the workbench appear. After a lot of brainstorming in the assembly without solver thread, and also some on the Assembl圓 preview and New Assembly 4? threads, a new assembly workbench for FreeCAD has emerged, called sequentially in the list Assembly #4.
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