Difference between revisions of "AutoCAD DWG"

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(Start of DWG file format)
 
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'''Contributor(s):''' AutoDesk Inc.
 
'''Contributor(s):''' AutoDesk Inc.
  
'''Relationships:''' [Bently http://pressreleases.autodesk.com/index.php?s=press_releases&item=436%3C%2Ftd%3E], the Free Software Foundation, and the Open Design Alliance
+
'''Relationships:''' [http://pressreleases.autodesk.com/index.php?s=press_releases&item=436%3C%2Ftd%3E Bently], the Free Software Foundation, and the Open Design Alliance
  
 
* '''Family Format(s):''' AutoCAD
 
* '''Family Format(s):''' AutoCAD
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'''Description:''' The AutoCAD DWG format is designed for the proprietary application AutoCAD and also works with other CAD applications via a licensing agreement with AutoDesk. This is the primary CAD format used today and is capable of storing 2D and 3D data and metadata. The specification for this format has not been released by AutoDesk and there are protections placed on DWG files to prevent any unlicensed program from reading or writing DWG files.
 
'''Description:''' The AutoCAD DWG format is designed for the proprietary application AutoCAD and also works with other CAD applications via a licensing agreement with AutoDesk. This is the primary CAD format used today and is capable of storing 2D and 3D data and metadata. The specification for this format has not been released by AutoDesk and there are protections placed on DWG files to prevent any unlicensed program from reading or writing DWG files.
  
'''History:''' [[History::]] Below is a short history of the format:
+
'''History:''' Below is a short history of the format:
*  
+
* 1977 - The DWG format is invented for the Interact CAD packaged by Mike Riddle
*  
+
* 1981 - AutoDesk co-founded by Riddle among others and Interact rewritten in C
*
+
* 1982 - DWG file format official licensed by AutoDesk Inc.
 +
* 1998 - OpenDWG released as a free read/write/view DWG application.
 +
* 1998 - AutoDesk adds file verification scheme DWGCHECK to AutoCAD and the DWG file format.
 +
* 2007 - AutoCAD 2007 and DWG specification changed to include AutoDesk "TrustedDWG technology"
 +
* 2008 - An open alternative to the DWG format is listed as 9th on the Free Software Foundation's High Priority Free Software Projects list.
  
'''Example(s):''' [[Example::Example Template]] - Information and example models of the engineering format.
+
'''Example(s):''' An example of a DWG house can be found [http://www.smartlister.com/SampleFiles.html here]. No sample is provided because the author had no DWG reader.
  
'''Identifier:''' [[Identifier::]] - A URL or other identifier that refers to the engineering format.
+
'''Identifier:''' [http://usa.autodesk.com/adsk/servlet/ps/item?siteID=123112&id=13117479&linkID=9240657]
  
'''Documentation:''' [[Documentation::Documentation Template]] - Information in general about the engineering format.
+
'''Documentation:''' [http://usa.autodesk.com/adsk/servlet/ps/item?siteID=123112&id=13117479&linkID=9240657]
  
'''File Extensions:''' [[File Extension::]] - Extensions of the engineering format, excluding the dot.
+
'''File Extensions:''' .dwg
  
 
'''Applications:'''
 
'''Applications:'''
  
* '''Native application(s):''' AutoCAD, Itellicad, and Caddie
+
* '''Native application(s):''' AutoCAD, ItelliCAD, and CADdie
  
 
* '''Interoperable applications:''' Interoperability is possible only by licensing from AutoDesk or by converting from DWG to some other format.
 
* '''Interoperable applications:''' Interoperability is possible only by licensing from AutoDesk or by converting from DWG to some other format.
  
'''Magic numbers:''' [[Magic Numbers::]] - Unique identifying characters at the beginning of files for this engineering format.
+
'''Magic numbers:''' Unknown
  
'''Format(s):''' [[Format::]] - The MIME file types.
+
'''Format(s):'''  
 +
* application/acad
 +
* application/x-acad
 +
* application/autocad_dwg
 +
* image/x-dwg
 +
* application/dwg
 +
* application/x-dwg
 +
* application/x-autocad
 +
* image/vnd.dwg
 +
* drawing/dwg
  
'''Rights:''' [[Rights::]] - The name or type of the license for the engineering format. Examples: BSD-style license, Apache License, Proprietary license
+
'''Rights:''' Proprietary license strictly distributed and managed by AutoDesk Inc. AutoDesk has [http://en.wikipedia.org/wiki/.dwg#Legal_issues sued] in the past to protect the "DWG" and AutoDesk trademarks in order to eliminate open libraries that can read/write/view their dwg files.
  
'''Sustainability Factors:''' - Facts about the sustainability of this particular engineering format.
+
'''Sustainability Factors:''' - AutoDesk will most likely continue to maintain and support for many years as this is their native file format. In the future, their may be a move to a more open format but this will stay well supported in the foreseeable future.
  
* '''Standardization:''' [[Standardization::]] - Information regarding standardization attempts with this format.
+
* '''Standardization:''' All attempts to open or standardize this file format have been stopped by legal or software measures by AutoDesk.
  
* '''Adoption:''' [[Adoption::]] - Information about how this format has been adopted by other organizations.
+
* '''Technical protection considerations:''' In 1998, AutoDesk introduced file verification in response to the OpenDWG libraries then added "TrustedDWG technology" in 2008.
  
** '''Licensing and patent claims:''' [[Licensing and patent claims::]] - Any licenses or patent claims that the engineering format makes.
+
'''Typical use:''' CAD
  
* '''Self-documentation:''' [[Self-documentation::]] - Any self-documentation capabilities of the format.
+
'''File classification:''' - Specific properties that pertain to this engineering format.
 +
* '''Type {Binary, Text}:''' Binary
  
* '''External dependencies:''' [[External dependencies::]] - Anything that the format depends on outside of its control to function.
+
NOTE: It is unclear what data and representations the DWG file supports because the author of this entry could not view any DWG files and the specification is not open or even discussed.
 
+
* '''Technical protection considerations:''' [[Technical protection considerations::]] - Any considerations that are necessary when it comes to technical protection.
+
 
+
'''Typical use:''' [[Typical use::]] - Keywords that describe the format's typical use. Examples: CAD and CAM
+
 
+
'''File classification:''' - Specific properties that pertain to this engineering format.
+
* '''Type {Binary, Text}:''' [[File Classification Type::]] - The type of file, choices are binary and text.
+
* '''Raster data:''' - Section describes whether or not the engineering format supports raster data.
+
** '''Raster data 2D:''' - Can the format support 2D raster data? Example: A format that can contain 2D pixelated data supports 2D raster data.
+
*** '''Is Supported:''' [[File Classification Raster Data 2D - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Raster Data 2D - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Raster data 3D:''' - Can the format support 3D raster data? Example: A format that can contain 2D pixelated data of a 3D model supports 3D raster data.
+
*** '''Is Supported:''' [[File Classification Raster Data 3D - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Raster Data 3D - Description::]] - This field is used to describe the support or lack of support of the feature.
+
* '''Geometric representation:''' - Section describes whether or not the engineering format supports geometric representations.
+
** '''Implicit representation:''' - Section describes whether or not the engineering format supports implicit representations.
+
*** '''Implicit surfaces:''' - Can the format support implicit surfaces? Example: A format that can contain surfaces that are generated with mathematical equations that contain the independent variables x, y, and z, like x^2 + y^2 + z^2 * R^2 = 0, supports implicit surfaces.
+
**** '''Is Supported:''' [[File Classification Implicit Surfaces - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Implicit Surfaces - Description::]] - This field is used to describe the support or lack of support of the feature.
+
*** '''Implicit curves:''' - Can the format support implicit curves? Example: A format that can contain curves that are generated with mathematical equations that contain the independent variables x, y, and z, supports implicit curves.
+
**** '''Is Supported:''' [[File Classification Implict Curves - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Implicit Curves - Description::]] - This field is used to describe the support or lack of support of the feature.
+
*** '''Point set:''' - Can the format support point sets? Example: A format that supports surfaces and lines that are generated by points that form triangles supports point sets.
+
**** '''Is Supported:''' [[File Classification Point Set - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Point Set - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Mesh:''' - Section describes whether or not the engineering format supports mesh.
+
*** '''Manifold surface meshes:''' - Can the format support manifold surface meshes? Example: A format that supports surfaces that are mathematical spaces in which every point has a neighborhood which resembles Euclidean space
+
**** '''Is Supported:''' [[File Classification Mainfold Surface Meshes - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Manifold Surface Meshes - Description::]] - This field is used to describe the support or lack of support of the feature.
+
*** '''Manifold volume meshes:''' - Can the format support manifold volume meshes? Example: A format that supports volumes that are mathematical spaces in which every point has a neighborhood which resembles Euclidean space
+
**** '''Is Supported:''' [[File Classification Manifold Volume Meshes - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Manifold Volume Meshes - Description::]] - This field is used to describe the support or lack of support of the feature.
+
*** '''Non-manifold meshes:''' - Can the format support non-manifold meshes? Example: A format that supports meshes that are not manifolds
+
**** '''Is Supported:''' [[File Classification Non-manifold Meshes - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Non-manifold Meshes - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Parametric representation:''' - Section describes whether or not the engineering format supports parametric representations.
+
*** '''Parametric surfaces:''' - Can the format support parametric surfaces? Example: A format that can contain surfaces that are generated with parametric equations supports parametric surfaces.
+
**** '''Is Supported:''' [[File Classification Parametric Surfaces - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Parametric Surfaces - Description::]] - This field is used to describe the support or lack of support of the feature.
+
*** '''Parametric curves:''' - Can the format support parametric curves? Example: A format that can contain curves that are generated with parametric equations supports parametric curves.
+
**** '''Is Supported:''' [[File Classification Parametric Curves - Is Supported::]] - Is the feature supported in the engineering format?
+
**** '''Description:''' [[File Classification Parametric Curves - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Contour sets:''' - Can the format support contour sets?
+
*** '''Is Supported:''' [[File Classification Contour Sets - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Contour Sets - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''NURBS:''' - Can the format support Non Uniform Rational Basis Splines? Examples: The engineering formats IGES, STEP, ACIS, and PHIGS
+
*** '''Is Supported:''' [[File Classification NURBS - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification NURBS - Description::]] - This field is used to describe the support or lack of support of the feature.
+
* '''Multi-resolution models:''' - Can the format support models with multiple resolutions? Examples: A format that supports a highly detailed and lowly detailed model simultaneously supports multi-resolution models.
+
** '''Is Supported:''' [[File Classification Multi-resolution Models - Is Supported::]] - Is the feature supported in the engineering format?
+
** '''Description:''' [[File Classification Multi-resolution Models - Description::]] - This field is used to describe the support or lack of support of the feature.
+
* '''Dynamics:''' - Section describes whether or not the engineering format supports dynamics.
+
** '''Kinematics:''' - Can the format support kinematics? Example: Does the format allow model parts to rotate?
+
*** '''Is Supported:''' [[File Classification Kinematics - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Kinematics - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Assembly:''' - Can the format support assembly? Example: Does the format allow the assembly instructions to be explicitly specified with a model?
+
*** '''Is Supported:''' [[File Classification Assembly - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Assembly - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Force(s):''' - Can the format support forces? Example: Does the format support acceleration forces?
+
*** '''Is Supported:''' [[File Classification Force - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Force - Description::]] - This field is used to describe the support or lack of support of the feature.
+
* '''Boundary representation''' - Can the format support models with boundary representations?
+
** '''Manifold surface boundary representations:''' - Can the format support manifold surface boundary representations? Example: The engineering format STEP
+
*** '''Is Supported:''' [[File Classification Manifold Surface Boundary Representation - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Manifold Surface Boundary Representation - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Manifold volume boundary representations:''' - Can the format support manifold volume boundary representations? Example: The engineering format STEP
+
*** '''Is Supported:''' [[File Classification Manifold Volume Boundary Representation - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Manifold Volume Boundary Representation - Description::]] - This field is used to describe the support or lack of support of the feature.
+
** '''Non-manifold boundary representations:''' - Can the format support non-manifold boundary representations? Example: The engineering format STEP
+
*** '''Is Supported:''' [[File Classification Non-manifold Boundary Representation - Is Supported::]] - Is the feature supported in the engineering format?
+
*** '''Description:''' [[File Classification Non-manifold Boundary Representation - Description::]] - This field is used to describe the support or lack of support of the feature.
+
* '''Material transparency:''' - Can the format support transparency? Example: Does the format allow models to have a clear window in a car?
+
** '''Is Supported:''' [[File Classification Material Transparency - Is Supported::]] - Is the feature supported in the engineering format?
+
** '''Description:''' [[File Classification Material Transparency - Description::]] - This field is used to describe the support or lack of support of the feature.
+
  
'''References:''' [[References::]] - A list of references regarding any aspects of this engineering format; any reading material supplemental to this page.
+
'''References:'''  
 +
* [http://usa.autodesk.com/adsk/servlet/ps/item?siteID=123112&id=13117479&linkID=9240657 AutoDesk page mentioning DWG]
 +
* [http://en.wikipedia.org/wiki/.dwg#Legal_issues Wikipedia page on .dwg files]
 +
* [http://www.hansenb.pdx.edu/DMKB/dict/tutorials/mime_typ.php MIME types for many common files]
 +
* [http://betaprograms.autodesk.com/history/autocad_release_history.htm AutoDesk release timeline]
 +
* [http://www.retrothing.com/2007/05/mike_riddles_pr.html Information on Mike Riddle and the beginning of DWG]
 +
* [http://pressreleases.autodesk.com/index.php?s=press_releases&item=436%3C%2Ftd%3E AutoDesk press release about their new "open" releationship with Bently]
 +
* [http://www.smartlister.com/SampleFiles.html Sample DWG file]

Latest revision as of 22:22, 12 May 2009

Title(s): AutoCAD DWG, DWG File Format, "Drawing" File Format, AutoCAD Drawing

Version ID: AutoCAD 2010

Date released: 2009

Date: 1999

Creator(s): Mike Riddle

Contributor(s): AutoDesk Inc.

Relationships: Bently, the Free Software Foundation, and the Open Design Alliance

  • Family Format(s): AutoCAD

Description: The AutoCAD DWG format is designed for the proprietary application AutoCAD and also works with other CAD applications via a licensing agreement with AutoDesk. This is the primary CAD format used today and is capable of storing 2D and 3D data and metadata. The specification for this format has not been released by AutoDesk and there are protections placed on DWG files to prevent any unlicensed program from reading or writing DWG files.

History: Below is a short history of the format:

  • 1977 - The DWG format is invented for the Interact CAD packaged by Mike Riddle
  • 1981 - AutoDesk co-founded by Riddle among others and Interact rewritten in C
  • 1982 - DWG file format official licensed by AutoDesk Inc.
  • 1998 - OpenDWG released as a free read/write/view DWG application.
  • 1998 - AutoDesk adds file verification scheme DWGCHECK to AutoCAD and the DWG file format.
  • 2007 - AutoCAD 2007 and DWG specification changed to include AutoDesk "TrustedDWG technology"
  • 2008 - An open alternative to the DWG format is listed as 9th on the Free Software Foundation's High Priority Free Software Projects list.

Example(s): An example of a DWG house can be found here. No sample is provided because the author had no DWG reader.

Identifier: [1]

Documentation: [2]

File Extensions: .dwg

Applications:

  • Native application(s): AutoCAD, ItelliCAD, and CADdie
  • Interoperable applications: Interoperability is possible only by licensing from AutoDesk or by converting from DWG to some other format.

Magic numbers: Unknown

Format(s):

  • application/acad
  • application/x-acad
  • application/autocad_dwg
  • image/x-dwg
  • application/dwg
  • application/x-dwg
  • application/x-autocad
  • image/vnd.dwg
  • drawing/dwg

Rights: Proprietary license strictly distributed and managed by AutoDesk Inc. AutoDesk has sued in the past to protect the "DWG" and AutoDesk trademarks in order to eliminate open libraries that can read/write/view their dwg files.

Sustainability Factors: - AutoDesk will most likely continue to maintain and support for many years as this is their native file format. In the future, their may be a move to a more open format but this will stay well supported in the foreseeable future.

  • Standardization: All attempts to open or standardize this file format have been stopped by legal or software measures by AutoDesk.
  • Technical protection considerations: In 1998, AutoDesk introduced file verification in response to the OpenDWG libraries then added "TrustedDWG technology" in 2008.

Typical use: CAD

File classification: - Specific properties that pertain to this engineering format.

  • Type {Binary, Text}: Binary

NOTE: It is unclear what data and representations the DWG file supports because the author of this entry could not view any DWG files and the specification is not open or even discussed.

References: