FreeCAD and DWG Import/it

Perché non è possibile importare i file DWG in FreeCAD?
Il formato DWG è un formato di file binario closed source che non è supportato direttamente da FreeCAD. Prima deve essere convertito usando un'applicazione esterna e dopo si può importare la conversione in FreeCAD e utilizzarla.

LibreDWG

 * homepage: https://www.gnu.org/software/libredwg/
 * license: GPLv2-or-later
 * optional, used to enable import and export of DWG files

GNU LibreDWG is a free C library to handle DWG files. It aims to be a free replacement for the Open Design Alliance Drawings SDK libraries. Be aware that, since libreDWG is a work-in-progress, it lacks support for some DWG entities.

Installation Windows
Downloading and unzip the appropriate pre-compiled Windows binary and then set the path to the executable manually. See Import Export Preferences.

Installation Linux/Unix systems
git clone https://git.savannah.gnu.org/git/libredwg.git cd libredwg mkdir build cd build cmake .. make make install (or use checkinstall, or simply locate & copy the dwg2dxf utility to your executables path, it will be then autodetected by FreeCAD)

You may need to set the path to the executable manually. See Import Export Preferences.

Installation openSUSE
To prevent problems you must use LibreDWG package compiled for the installed openSUSE OS distribution. LibreDWG is typically installed with YAST (abbr. Yet another Setup Tool), the Linux operating system's setup and configuration tool.

The more experienced user first gets an overview of possible packages provided. Note: openSUSE has several options to choose from when downloading LibreDWG. To view these options, visit Survey of provided LibreDWG packages on openSUSE.

For e.g. Intel or AMD 64-bit desktops, laptops, and servers the (x86_64) release is the one to select. So libredwg0 and libredwg-tools are of the right choice to install.

It is recommended to grab the binary packages directly. Then select the correct distribution for your installed openSUSE OS.

In any terminal/console (root rights required) the installation will be carried out with:

You may need to set the path to the executable manually. See Import Export Preferences.

ODA Converter (anteriormente Teigha Converter)

 * homepage: https://www.opendesign.com/guestfiles/oda_file_converter
 * licenza: freeware
 * optional, usato per abilitare l'importazione e l'esportazione dei file DWG


 * homepage: https://www.opendesign.com/guestfiles/oda_file_converter
 * license: freeware
 * optional, used to enable import and export of DWG files

Il convertitore ODA è una piccola utility liberamente disponibile che consente di convertire tra diverse versioni i file DWG e DXF. FreeCAD può usarlo per offrire l'importazione e l'esportazione dei file DWG, convertendo prima i formati DWG in DXF al suo interno, e poi importando il contenuto dei file tramite il suo importatore DXF standard. Si applicano le restrizioni di importazione di DXF.

Installazione
Su tutte le piattaforme, basta installare il pacchetto appropriato da https://www.opendesign.com/guestfiles/oda_file_converter. Se, dopo l'installazione, l'utility non viene trovata automaticamente da FreeCAD, può essere necessario impostare manualmente il percorso del file eseguibile del converter. Attivare l'ambiente Draft, poi nelle opzioni del menu Modifica → Preferenze → Draft → Importa/Esporta → DWG inserire il percorso per l'eseguibile Teigha File Converter.

if the utility is not found automatically by FreeCAD after installation, you need to set the path to the executable manually. See Import Export Preferences.

QCAD pro

 * homepage: https://qcad.org/en/qcad-command-line-tools#dwg2dwg
 * license: commercial
 * optional, used to enable import and export of DWG files

QCAD is a well-known open-source DXF-based 2D CAD platform. It also offers a paid pro version, which is basically the open-source version plus support for the DWG format. When buying the pro version, QCAD also includes a DWG to DXF conversion utility that can be used by FreeCAD.

Installation
if the utility is not found automatically by FreeCAD after installation, you need to set the path to the executable manually. See Import Export Preferences.

CADExchanger Workbench
Installing the CADExchanger Workbench allows for working with DWG files through integration with the paid commercial file converter product CADExchanger. Just follow the instructions in the GitHub repository. You can discuss this workbench on its forum thread.

At the moment, the CADExchanger way is the only one that allows to work with 3D DWG files, by converting them to other 3D formats.

DoubleCAD XT
C'è anche DoubleCAD XT (https://www.turbocad.com/content/doublecad-xt-v5). Il programma è gratuito per uso personale e commerciale. Si richiede una iscrizione gratuita per ricevere il codice di attivazione via e-mail. Questo programma è solo per Windows. Nota: non sembra essere stato aggiornato per anni.

There is also DoubleCAD XT (https://www.turbocad.com/content/doublecad-xt-v5). The program is free for personal and commercial use. It requires a free sign-up to receive an activation code via E-Mail. This Program is windows-only. Note: it does not seem to have been updated for years.

NanoCAD 5.0
There is also nanoCAD 5.0 (https://nanocad.com/products/nanoCAD/download/). The program is free for personal and commercial use. It requires a free sign-up to receive an activation code via E-Mail. This Program is windows-only.

Esportare i file di AutoCAD in Formati Amichevoli
Esportare i file di AutoCAD in un formato più amichevole a FreeCAD, come DXF R12 o R14, SVG, e se la versione lo supporta, IGES. Tutti questi formati sono delle alternative migliori al formato DWG quando si utilizza FreeCAD.

Exporting your AutoCAD files in a more FreeCAD friendly format, like DXF R12 or R14, SVG, and if version supports it, IGES. All are better alternatives to the DWG format when using FreeCAD.

È importante sapere che, contrariamente alla credenza popolare, non vi è alcuna differenza tra il contenuto di un file salvato in formato DWG o DXF, a condizione che sia la stessa versione (es. DWG 2014 o DXF 2014). Entrambi i formati sono mantenuti da Autodesk, ed entrambi supportano esattamente le stesse caratteristiche. La differenza è che DWG è chiuso (codice-macchina), mentre DXF è aperto.

Promuovere l'uso dei formati alternativi
In poche parole, smettere di accettare il lavoro svolto in formato DWG. Nella pratica, spesso questo è più facile a dirsi che a farsi. Tuttavia, per gli utenti e i sostenitori di FreeCAD non sarebbe una cattiva pratica quella di evitare e respingere il formato DWG, quando possibile.

Simply put, stop accepting work done in DWG format. In practice, this is often easier said than done. Still, it would not be bad practice for users and supporters of FreeCAD to avoid and reject the DWG format whenever possible.

Use the LibreDWG library and file bug reports
In development version as mentioned above you can switch from the proprietary ODA Converter to the free software LibreDWG library for DWG (and DXF) files. Please do this and report any problems you encounter.