DXF Reference - Autodesk

1 autocad 2012. DXF Reference February 2011. 2011 Autodesk , Inc. All Rights Reserved. Except as otherwise permitted by Autodesk , Inc., this publication, or parts thereof, may not be reproduced in any form, by any method, for any purpose. Certain materials included in this publication are reprinted with the permission of the copyright holder. Trademarks The following are registered trademarks or trademarks of Autodesk , Inc., and/or its subsidiaries and/or affiliates in the USA and other countries: 3 DEC (design/logo), 3 December, , 3ds Max, Algor, Alias, Alias (swirl design/logo), AliasStudio, Alias|Wavefront (design/logo), ATC, AUGI, autocad , autocad Learning Assistance, autocad LT, autocad Simulator, autocad SQL Extension, autocad SQL Interface, Autodesk , Autodesk Intent, Autodesk Inventor, Autodesk MapGuide, Autodesk Streamline, AutoLISP, AutoSnap, AutoSketch, AutoTrack, Backburner, Backdraft, Beast, Built with ObjectARX (logo), Burn, Buzzsaw, CAiCE, Civil 3D, Cleaner, Cleaner Central, ClearScale, Colour Warper, Combustion, Communication Specification, Constructware, Content Explorer, Dancing Baby (image)

2 , DesignCenter, Design Doctor, Designer's Toolkit, DesignKids, DesignProf, DesignServer, DesignStudio, Design Web Format, Discreet, DWF, DWG, DWG (logo), DWG Extreme, DWG TrueConvert, DWG TrueView, DXF, Ecotect, Exposure, Extending the Design Team, Face Robot, FBX, Fempro, Fire, Flame, Flare, Flint, FMDesktop, Freewheel, GDX Driver, Green Building Studio, Heads-up Design, Heidi, HumanIK, IDEA Server, i-drop, Illuminate Labs AB (design/logo), ImageModeler, iMOUT, Incinerator, Inferno, Inventor, Inventor LT, Kynapse, Kynogon, LandXplorer, LiquidLight, LiquidLight (design/logo), Lustre, MatchMover, Maya, Mechanical Desktop, Moldflow, Moldflow Plastics Advisers, MPI, Moldflow Plastics Insight, Moldflow Plastics Xpert, Moondust, MotionBuilder, Movimento, MPA, MPA (design/logo), MPX, MPX (design/logo), Mudbox, Multi-Master Editing, Navisworks, ObjectARX, ObjectDBX, Opticore, Pipeplus, PolarSnap, PortfolioWall, Powered with Autodesk Technology, Productstream, ProMaterials, RasterDWG, RealDWG, Real-time Roto, Recognize, Render Queue, Retimer, Reveal, Revit, RiverCAD, Robot, Showcase, Show Me, ShowMotion, SketchBook, Smoke, Softimage, Softimage|XSI (design/logo)

3 , Sparks, SteeringWheels, Stitcher, Stone, StormNET, StudioTools, ToolClip, Topobase, Toxik, TrustedDWG, U-Vis, ViewCube, Visual, Visual LISP, Volo, Vtour, WaterNetworks, Wire, Wiretap, WiretapCentral, XSI. All other brand names, product names or trademarks belong to their respective holders. Disclaimer THIS PUBLICATION AND THE INFORMATION CONTAINED HEREIN IS MADE AVAILABLE BY Autodesk , INC. "AS IS." Autodesk , INC. DISCLAIMS. ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR. FITNESS FOR A PARTICULAR PURPOSE REGARDING THESE MATERIALS. Published by: Autodesk , Inc. 111 McInnis Parkway San Rafael, CA 94903, USA. Contents Chapter 1 DXF Format.

4 1. Organization of This Reference ..1. Revisions to the DXF Reference ..1. Formatting Conventions in This Reference ..2. Object and Entity Codes ..2. Group Code Value Types ..3. Group Codes in Numerical Order ..5. Chapter 2 HEADER Section .. 11. HEADER Section Group Codes .. 11. Revised VPORT Header Variables .. 28. Special Handling of Date/Time Variables .. 29. Chapter 3 CLASSES Section .. 31. CLASSES Section Group Codes .. 31. Default Class Values .. 32. Chapter 4 TABLES Section .. 35. Symbol Table Group Codes .. 35. Common Symbol Table Group Codes .. 36. Common Group Codes for Symbol Table Entries .. 37. APPID .. 38. iii BLOCK_RECORD .. 38. DIMSTYLE .. 39. LAYER .. 43. LTYPE .. 44. STYLE .. 46.

5 UCS .. 47. VIEW .. 49. VPORT .. 52. Chapter 5 BLOCKS Section .. 57. BLOCKS Section Group Codes .. 57. BLOCK .. 58. ENDBLK .. 59. Chapter 6 ENTITIES Section .. 61. Common Group Codes for Entities .. 61. 3 DFACE .. 64. 3 DSOLID .. 65. ACAD_PROXY_ENTITY .. 65. ARC .. 66. ATTDEF .. 67. ATTRIB .. 72. BODY .. 77. CIRCLE .. 77. DIMENSION .. 78. Common Dimension Group Codes .. 78. Aligned Dimension Group Codes .. 80. Linear and Rotated Dimension Group Codes .. 81. Radial and Diameter Dimension Group Codes .. 82. Angular Dimension Group Codes .. 83. Ordinate Dimension Group Codes .. 85. Dimension Style Overrides .. 86. ELLIPSE .. 86. H AT C H .. 8 7. Boundary Path Data .. 90. Pattern Data .. 94. HELIX .. 94.

6 IMAGE .. 95. INSERT .. 97. LEADER .. 98. LIGHT .. 100. LINE .. 101. LWPOLYLINE .. 102. MESH .. 103. MLINE .. 104. iv | Contents MLEADERSTYLE .. 107. MLEADER .. 109. Common MLeader Group Codes .. 110. MLeader Context Data Group Codes .. 112. MLeader Leader Node Group Codes .. 116. MLeader Leader Line Group Codes .. 117. MTEXT .. 117. OLEFRAME .. 120. OLE2 FRAME .. 120. POINT .. 123. POLYLINE .. 123. Polyface Meshes .. 125. RAY .. 126. REGION .. 126. SECTION .. 127. SEQEND .. 128. SHAPE .. 128. SOLID .. 129. SPLINE .. 130. SUN .. 132. SURFACE .. 133. Extruded Surface .. 133. Lofted Surface .. 135. Revolved Surface .. 136. Swept Surface .. 137. TA B L E .. 1 3 8. TEXT .. 144. TOLERANCE .. 146. TRACE.

7 146. UNDERLAY .. 147. VERTEX .. 149. VIEWPORT .. 150. WIPEOUT .. 155. XLINE .. 157. Chapter 7 OBJECTS Section .. 159. OBJECT Section Group Codes .. 159. Object Ownership .. 159. Common Group Codes for Objects .. 160. ACAD_PROXY_OBJECT .. 161. ACDBDICTIONARYWDFLT .. 161. ACDBPLACEHOLDER .. 162. DATATABLE .. 163. DICTIONARY .. 164. DICTIONARYVAR .. 166. DIMASSOC .. 166. Contents | v FIELD .. 168. GEODATA .. 170. GROUP .. 172. IDBUFFER .. 173. IMAGEDEF .. 173. IMAGEDEF_REACTOR .. 174. LAYER_INDEX .. 175. LAYER_FILTER .. 175. LAYOUT .. 176. LIGHTLIST .. 179. MATERIAL .. 179. MLINESTYLE .. 186. OBJECT_PTR .. 188. PLOTSETTINGS .. 189. RASTERVARIABLES .. 192. RENDER .. 193. RENDERENVIRONMENT .. 193. MENTALRAYRENDERSETTINGS.

8 194. RENDERGLOBAL .. 197. SECTION .. 198. Section Manager .. 199. Section Settings .. 199. Section Type Settings .. 200. Section Geometry Settings .. 201. SPATIAL_INDEX .. 202. SPATIAL_FILTER .. 203. SORTENTSTABLE .. 204. TABLESTYLE .. 205. UNDERLAYDEFINITION .. 207. VISUALSTYLE .. 208. VBA_PROJECT .. 211. WIPEOUTVARIABLES .. 211. XRECORD .. 212. Chapter 8 THUMBNAILIMAGE Section .. 215. THUMBNAILIMAGE Section Group Codes .. 215. Chapter 9 Drawing Interchange File Formats .. 217. ASCII DXF Files .. 217. General DXF File Structure .. 217. Group Codes in DXF Files .. 219. ASCII Control Characters in DXF Files .. 219. Header Group Codes in DXF Files .. 219. Class Group Codes in DXF Files .. 220. Symbol Table Group Codes in DXF Files.

9 220. vi | Contents Symbol Table Example .. 221. Blocks Group Codes in DXF Files .. 224. Entity Group Codes in DXF Files .. 226. Object Group Codes in DXF Files .. 226. Writing a DXF Interface Program .. 227. Reading a DXF File .. 228. Writing a DXF File .. 230. Binary DXF Files .. 234. Slide Files .. 235. Old Slide Header .. 238. Slide Library Files .. 239. Chapter 10 Advanced DXF Issues .. 241. Database Objects .. 241. Persistent Inter-Object Reference Handles .. 241. Pointer and Ownership References .. 242. Hard and Soft References .. 242. Arbitrary Handles .. 243. 1005 Group Codes .. 243. Subclass Markers .. 243. Extension Dictionary and Persistent Reactors .. 246. Extended Data .. 246. Object Coordinate Systems (OCS).

10 250. Arbitrary Axis Algorithm .. 252. Index .. 253. Contents | vii viii DXF Format 1. The DXF format is a tagged data representation of all the information contained in an autocad drawing file. Tagged data means that each data element in the file is preceded by an integer number that is called a group code. A group code's value indicates what type of data element follows. This value also indicates the meaning of a data element for a given object (or record) type. Virtually all user-specified information in a drawing file can be represented in DXF format. Organization of This Reference The DXF Reference presents the DXF group codes found in DXF files and . encountered by AutoLISP and ObjectARX applications.