FreeCAD and DWG Import/es

¿Por qué es difícil soportar archivos DWG en FreeCAD?
El formato DWG es un formato de archivo binario de código cerrado que no es soportado directamente por FreeCAD. Requiere un conversor de archivos externo de terceros para convertirlo primero e importar la conversión a FreeCAD para su uso.

Ten en cuenta que en este momento no es posible importar DWG 3D en FreeCAD. Los datos 3D están incrustados como datos binarios .SAT (ACIS), un formato propietario y no documentado.

Convertidor ODA (antes Convertidor Teigha)

 * página web: https://www.opendesign.com/guestfiles/oda_file_converter
 * licencia: freeware
 * opcional, utilizado para permitir la importación y exportación de archivos DWG

El ODA Conversor es una pequeña utilidad de libre acceso que permite convertir entre varias versiones de archivos DWG y DXF. FreeCAD puede utilizarlo para ofrecer importación y exportación de DWG, convirtiendo los archivos DWG al formato DXF bajo el capó, y luego utilizando su importador DXF estándar para importar el contenido del archivo. Se aplican las restricciones del importador DXF.

Instalación
On all platforms, only by installing the appropriate package from https://www.opendesign.com/guestfiles/oda_file_converter. After installation, if the utility is not found automatically by FreeCAD, you might need to set the path to the converter executable manually. open Edit → Preferences → Import-Export → DWG and fill "Path to Teigha File Converter" appropriately.

Para obtener instrucciones más detalladas, consulte este tutorial.

Utilización
The program may be used with the command line interface or the graphical interface. Be sure to convert the DWG files to an ASCII-Format.

Command Line Format is:
 * 1) Quoted Input Folder
 * 2) Quoted Output Folder
 * 3) Output_version {"ACAD9","ACAD10","ACAD12", "ACAD13","ACAD14", "ACAD2000","ACAD2004", "ACAD2007","ACAD2010"}
 * 4) Output File type {"DWG","DXF","DXB"}
 * 5) Recurse Input Folder {"0","1"}
 * 6) Audit each file {"0","1"}
 * 7) [optional] Input file filter (default:"*.DWG;*.DXF")

Example for Linux

ODAFileConverter "/home/dwg-data" "/home/dxf-data" "ACAD2010" "DXF" "0" "1" "test.dwg" The second number (audit) needs to be 1 otherwise it fails

Example for Windows

"C:\Program Files\ODA\Teigha File Converter 3.08.2\TeighaFileConverter.exe" "Path-To-Input-Directory" "Path-To-Output-Directory" "ACAD2010" "DXF" "0" "1" "Name-Of-A-Test-File.dwg"

CADExchanger Ambiente de trabajo
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.

FreeCAD v0.19 y LibreDWG
As from 0.19, FreeCAD doesn't need the ODA converter anymore and can use libreDWG directly. Be aware that, since libreDWG is a work-in-progress, depending on your file, the results might not be the same.


 * 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.

Instalación
LibreDWG is included in v 0.19_pre appimages

LibreDWG can be configured to work on Windows by downloading and unzipping the appropriate pre-compiled windows binary and adding the folder to your Windows versions system path.

On Linux: 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)

DoubleCAD XT
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.

Exportar sus archivos de AutoCAD en formato amigable
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.

It is important to know that, contrarily to popular belief, there is no difference between the contents of a file saved in DWG or DXF formats, provided it is the same version (ex. DWG 2014 vs. DXF 2014). Both formats are maintained by Autodesk, and they both support exactly the same features. The difference is that DWG is closed (machine-encoded) while DXF is open.

Promover el uso de formatos alternativos
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.

Utilizar la biblioteca LibreDWG y presentar informes de errores
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.