Assembly3 Workbench/it

Introduzione
Assembly3 is a external workbench that is used to perform assembly of different bodies contained in a single file or in multiple documents.

It was developed as a testbed for the App Link object that was eventually included in FreeCAD 0.19.

Compatibility
Assembly3 was inspired by Assembly2, but it is not compatible with it. If you have older models made in Assembly2, you should stay with FreeCAD 0.16 and use Assembly2 there.

New models developed with Assembly3 should only be opened and edited with this workbench.

Although they may have similar tools, Assembly3 is not compatible with A2plus nor Assembly4. Models created with these workbenches should be opened only with their respective workbench.

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Testing
The Assembly3 Workbench is under development and is not yet available (April 2020) through the Addon Manager, but it is expected that this will happen at some point.

You can test it in two ways:
 * A special fork of FreeCAD made by realthunder; see FreeCAD_assembly3 releases. This fork is based on a particular commit of the master branch of FreeCAD, but it also has additional features currently not present in the master branch. Due to this fork being based on a particular development snapshot, it does not have the latest features merged daily to the master branch.
 * The development AppImage; this is based on the current master branch, and includes the dependencies needed for working with Assembly3 such as the SolveSpace solver.

Since the AppImage only works for Linux, for Windows users at the moment the only option to test Assembly3 is the first option (realthunder's fork).

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Links

 * App Link object that makes Assembly3 work.
 * FreeCAD_assembly3 repository and documentation.
 * Assembly3 preview, big discussion thread.
 * Test tutorial for Assembly 3 WB by jpg87.
 * Current Assembly Status
 * External workbenches
 * External workbench list
 * Old Assembly project development plan, to get acquainted with the history of the issue.