Documentation

    Table of Content
    • 3D File Formats
      • 3D File Formats
      • 3D2
      • 3DM
      • 3DS
      • 3MF
      • AMF
      • ASE
      • B3D
      • BLEND
      • C4D
      • DAE
      • DBM
      • DRC
      • E57
      • FBX
      • GLB
      • GLTF
      • IPT
      • JT
      • MA
      • MB
      • MP
      • OBJ
      • PLY
      • POV
      • PRC
      • RVM
      • STEP
      • STP
      • U3D
      • USD
      • USDZ
      • VRML
      • X
      • X3D
    • Audio File Formats
      • Audio File Formats
      • 8SVX
      • AA
      • AAC
      • AAX
      • AC3
      • ACT
      • AIFF
      • ALAC
      • AMR
      • APE
      • CDA
      • DSS
      • EC3
      • EFS
      • FLAC
      • FLP
      • GSM
      • M3U
      • M3U8
      • M4A
      • M4B
      • M4P
      • M4R
      • MID
      • MKA
      • MMF
      • MOD
      • MP2
      • MP3
      • MPC
      • MTM
      • MUI
      • MXL
      • NSA
      • OGG
      • OPUS
      • RA
      • RF64
      • RIP
      • SDT
      • SF2
      • STAP
      • VOC
      • VOX
      • VQF
      • WAV
      • WEBA
      • WFP
      • WMA
      • WPL
      • WPROJ
      • WV
    • CAD File Formats
      • CAD File Formats
      • AFS
      • ART
      • ASC
      • ASM
      • AXM
      • BDC
      • CATPART
      • CF2
      • CIR
      • CPA
      • DC3
      • DGN
      • DST
      • DWF
      • DWFX
      • DWG
      • DWT
      • DXB
      • DXF
      • FZP
      • HPGL
      • IBA
      • IFC
      • IGES
      • IGS
      • JVSG
      • NC
      • NWC
      • NWD
      • NWF
      • OPT
      • PAT
      • PC3
      • PHJ
      • PLT
      • PSM
      • PSS
      • RFA
      • RFT
      • RML
      • RVT
      • SLDPRT
      • STL
    • Compression File Formats
      • Compression File Formats
      • 7Z
      • ACE
      • ALZ
      • APK
      • APZ
      • ARC
      • ARJ
      • B1
      • B6Z
      • BKF
      • BNDL
      • BZ2
      • CB7
      • CBA
      • CIT
      • CPIO
      • DAA
      • DAR
      • DEB
      • DMG
      • DZ
      • ECS
      • FZPZ
      • GZ
      • GZIP
      • ICE
      • ISO
      • KGB
      • LBR
      • LQR
      • LZ
      • LZ4
      • LZH
      • LZMA
      • LZO
      • LZX
      • MBW
      • MINT
      • MPKG
      • MPQ
      • NPK
      • OAR
      • P7Z
      • PAGES
      • PEA
      • PET
      • PF
      • PKG
      • PTK
      • PUP
      • PWA
      • R2
      • RAR
      • RPM
      • RTE
      • S00
      • SFG
      • SIFZ
      • SIT
      • SITX
      • SMPF
      • SQX
      • SY_
      • TAR
      • TBZ
      • TGS
      • TGZ
      • TPSR
      • TZ
      • VPK
      • WHL
      • WUX
      • XAPK
      • XAR
      • XIP
      • XPI
      • XZ
      • Z
      • ZIM
      • ZIP
      • ZIPX
      • ZL
      • ZST
    • Database
      • Database File Formats
      • 4DB
      • 4DD
      • ABCDDB
      • ACCDB
      • ACCDC
      • ACCDE
      • ACCDR
      • ACCDT
      • ACCDW
      • ACCFT
      • ADB
      • ADE
      • ADF
      • ADN
      • ADP
      • ALF
      • ANB
      • AQ
      • ASK
      • BAK
      • BCP
      • BTR
      • CAT
      • CDB
      • CRYPT12
      • CRYPT14
      • DACPAC
      • DAT
      • DB
      • DB-WAL
      • DB3
      • DBC
      • DBF
      • DBS
      • DDL
      • DLIS
      • DSN
      • DTSX
      • DXL
      • EPIM
      • FDB
      • FIC
      • FMP12
      • FMPSL
      • FP5
      • FP7
      • GDB
      • ITW
      • LDF
      • LOG
      • MDB
      • MDF
      • MYI
      • NDF
      • NMONEY
      • NSF
      • PAN
      • PDM
      • SAV
      • SDF
      • SQL
      • SQLITE
      • TE
      • TEACHER
      • TRC
      • TRM
      • UDL
      • WDB
      • XEM
    • Disc and Media
      • Disc and Media File Formats
      • BIN
      • CCD
      • CSO
      • CUE
      • ECM
      • GADGET
      • IMG
      • ISZ
      • MDF
      • MDS
      • NKIT
      • NRG
      • NRI
      • OVA
      • OVF
      • ROM
      • SDI
      • TIB
      • Toast
      • UDF
      • VCD
      • VDI
      • VHD
      • VHDX
      • WBFS
      • WIM
      • WUD
    • EBook File Formats
      • EBook File Formats
      • ACSM
      • AEP
      • APNX
      • AVA
      • AZW
      • AZW1
      • AZW3
      • AZW4
      • BKK
      • BPNUEB
      • CBC
      • CBR
      • CBZ
      • CEB
      • CEBX
      • DNL
      • EA
      • EAL
      • EBK
      • EDN
      • EPUB
      • ETD
      • FB2
      • FKB
      • HAN
      • HTML0
      • HTMLZ
      • HTXT
      • HTZ4
      • HTZ5
      • IBOOKS
      • JWPUB
      • KFX
      • KOOB
      • LIT
      • LRF
      • LRS
      • LRX
      • MART
      • MBP
      • MOBI
      • NCX
      • NVA
      • OEB
      • OEBZIP
      • OPF
      • ORB
      • PHL
      • PML
      • PMLZ
      • POBI
      • PRC
      • QMK
      • RB
      • RZB
      • RZS
      • SNB
      • TCR
      • TK3
      • TPZ
      • TR
      • TR3
      • VBK
      • WEBZ
      • YBK
    • Email File Formats
      • Email File Formats
      • EDB
      • EML
      • EMLX
      • ICS
      • MBOX
      • MSG
      • OFT
      • OLM
      • OST
      • P7S
      • PST
      • RPMSG
      • TNEF
      • VCF
    • Executable
      • Executable File Formats
      • 8CK
      • AC
      • AHK
      • AIR
      • APP
      • BAT
      • BMS
      • BTAPP
      • CGI
      • CHEAT
      • CMD
      • COM
      • ELF
      • EXE
      • IPA
      • JSF
      • MLX
      • MSI
      • MST
      • PIF
      • PYC
      • REG
      • RUN
      • WSF
      • WSH
      • XAP
      • XBE
      • XEX
    • Finance
      • Finance File Formats
      • ABA
      • IXBRL
      • OFX
      • XBRL
    • Font
      • Font File Formats
      • BDF
      • CFF
      • CFF2
      • EOT
      • ETX
      • FNT
      • FON
      • FOT
      • GXF
      • JFPROJ
      • MFX
      • ODTTF
      • OTF
      • PFA
      • PFB
      • PFM
      • SFD
      • TTC
      • TTF
      • Type1
      • VFB
      • VLW
      • WOFF
      • WOFF2
    • Game File Formats
      • Game File Formats
      • BIN
      • BMZ
      • BNS
      • BO2
      • CLIP
      • CON
      • CSD
      • CT
      • DDT
      • DEK
      • EPK
      • FOMOD
      • GAM
      • GBX
      • GCF
      • KODU
      • LANG
      • LITEMOD
      • MCA
      • MCPACK
      • MCR
      • MCSTRUCTURE
      • MCWORLD
      • MGX
      • MII
      • NPA
      • OSB
      • OSK
      • OSR
      • OSU
      • OSZ
      • P3T
      • PAK
      • PCC
      • PSS
      • PUP
      • PWF
      • PXP
      • REL
      • REP
      • RPX
      • SAV
      • SCWORLD
      • SFAR
      • SID
      • SIMS3PACK
      • TTR
      • TXD
      • U8
      • UMX
      • Unity3D
      • USX
      • VPK
      • VRCW
      • W3N
      • W3X
      • XS
    • GIS File Formats
      • GIS File Formats
      • 000
      • 3D
      • 3DC
      • 3DD
      • 3DL
      • ADF
      • APL
      • APR
      • ATX
      • AUX
      • AVL
      • AXE
      • BT
      • CSF
      • CXF
      • DEM
      • DIV
      • DIX
      • DLG
      • DT0
      • DT1
      • DT2
      • E00
      • EMBR
      • ETA
      • FileGDB
      • FIT
      • FMW
      • GeoJSON
      • GLB
      • GMAP
      • GML
      • GPKG
      • GPX
      • GSM
      • GST
      • HDR
      • IMG
      • KML
      • KMZ
      • LAN
      • LOC
      • MID
      • MIF
      • MPK
      • MPS
      • MSD
      • MXD
      • MXT
      • NM2
      • NMC
      • NTF
      • OSC
      • OSM
      • PMF
      • PTM
      • QGD
      • QGS
      • QGZ
      • QLR
      • QML
      • SAF
      • SBN
      • SDF
      • SHP
      • SHX
      • SP3
      • SSF
      • TCX
      • TFRD
      • WLX
      • WOR
    • Image File Formats
      • Image File Formats
      • AFPHOTO
      • AFX
      • AGIF
      • AGP
      • AI
      • APM
      • APNG
      • ART
      • AVIF
      • BIF
      • BMP
      • BPG
      • CDR
      • CLIP
      • CMX
      • CPC
      • CR2
      • CR3
      • CSL
      • CT
      • CUR
      • DCM
      • DCR
      • DCX
      • DDS
      • DIB
      • DICOM
      • DJVU
      • DNG
      • ECW
      • EMF
      • EMZ
      • EXIF
      • FLIF
      • FODG
      • GBR
      • GIF
      • HDR
      • HEIC
      • HEIF
      • ICNS
      • ICO
      • J2C
      • J2K
      • JFIF
      • JP2
      • JPC
      • JPEG
      • JPF
      • JPM
      • JPX
      • JXL
      • JXR
      • MNG
      • MP
      • MPO
      • NEF
      • ODG
      • OTG
      • PCT
      • PCX
      • PICT
      • PNG
      • PPP
      • PSB
      • PSD
      • PSP
      • PSPIMAGE
      • SKP
      • SVGZ
      • TGA
      • THM
      • TIFF
      • WEBP
      • WMF
      • WMZ
      • XPM
      • XPR
    • Misc File Formats
      • Misc File Formats
      • AML
      • ART
      • BUP
      • CMS
      • CTG
      • DAP
      • DOWNLOADING
      • ENL
      • ERR
      • GPG
      • H4
      • H5
      • ICA
      • IPSW
      • ISN
      • KLQ
      • LDB
      • LOCK
      • LRC
      • MD5
      • MSO
      • NOMEDIA
      • OBB
      • ODF
      • OGG
      • PES
      • PKPASS
      • RIS
      • RML
      • SSP
      • THM
      • TORRENT
      • VIM
      • VIMRC
      • XMP
      • XSMX
    • Note Taking File Formats
      • Note Taking File Formats
      • ONE
      • ONETOC2
    • Page Description Language
      • Page Description Language
      • AVERY
      • CGM
      • EPS
      • INDD
      • INDT
      • OXPS
      • PCL
      • PS
      • SVG
      • SWF
      • TEX
      • XPS
      • XSLFO
    • PDF
      • PDF
      • FDF
      • PDF/A
      • PDF/E
      • PDF/UA
      • PDF/VT
      • PDF/X
      • XFDF
    • Presentation File Formats
      • Presentation File Formats
      • KEY
      • ODP
      • OTP
      • POT
      • POTM
      • POTX
      • PPS
      • PPSM
      • PPSX
      • PPT
      • PPTM
      • PPTX
    • Programming
      • Programming
      • 4th
      • ABC
      • ACD
      • ADDIN
      • ADS
      • AFPHOTO
      • AGI
      • AIA
      • AIDL
      • ALB
      • AML
      • ANE
      • APA
      • APKS
      • APPX
      • APPXBUNDLE
      • APPXUPLOAD
      • APS
      • ARSC
      • AS
      • AS2PROJ
      • AS3PROJ
      • ASC
      • ASI
      • ASM
      • ASVF
      • AU3
      • AWK
      • C
      • C3
      • CC
      • CD
      • Class
      • CMAKE
      • CONFIG
      • CPP
      • CS
      • CSPROJ
      • CSX
      • CXX
      • Dart
      • DIFF
      • EGG
      • ERB
      • EX
      • G4
      • GMD
      • GO
      • GROOVY
      • H
      • HAML
      • HH
      • HS
      • HTA
      • ICI
      • IN
      • INC
      • IPR
      • JAR
      • Jav
      • Java
      • JRXML
      • JSP
      • JSPF
      • KT
      • LGO
      • LUA
      • M
      • MAKE
      • MEL
      • MF
      • ML
      • MM
      • MRC
      • MSIX
      • NUPKG
      • NUT
      • NX
      • PAS
      • PDB
      • PDE
      • PHP
      • PL
      • PY
      • PYD
      • PYI
      • PYM
      • PYW
      • PYX
      • R
      • RBXL
      • RBXM
      • RES
      • RS
      • RST
      • SCALA
      • SCM
      • SCRIPT
      • SH
      • SLN
      • SWIFT
      • TCL
      • TOML
      • TS
      • UNITY
      • VB
      • VBPROJ
      • VBS
      • VCPROJ
      • VCXPROJ
      • XSD
      • YAML
      • YML
      • YPR
    • Project Management File Formats
      • Project Management File Formats
      • MPP
      • MPT
      • MPX
      • P6XML
      • XER
    • Publisher File Formats
      • Publisher File Formats
      • PUB
      • PUZ
    • Reporting
      • Reporting File Formats
      • MAR
      • RDL
      • RDLC
      • RPL
      • RPT
    • Settings File Formats
      • Settings File Formats
      • ACO
      • ASL
      • CNF
      • CONF
      • DSD
      • GXT
      • ISS
      • OBI
      • OSS
      • OVPN
      • PMP
      • RDP
      • SBV
      • SET
      • SETTINGS
      • THEME
      • THEMEPACK
      • TPF
    • Spreadsheet File Formats
      • Spreadsheet File Formats
      • 123
      • 12M
      • _XLS
      • _XLSX
      • AST
      • AWS
      • BKS
      • CELL
      • CHIP
      • CSV
      • CTS
      • DEF
      • DEX
      • DFG
      • DIF
      • DIS
      • EFU
      • ESS
      • FCS
      • FM
      • FODS
      • FP
      • GNM
      • GNUMERIC
      • GSHEET
      • IMP
      • MAR
      • NB
      • NUMBERS
      • NUMBERS-TEF
      • ODS
      • OTS
      • PMD
      • PMDX
      • PMVX
      • PRESTO
      • QPW
      • SDC
      • STC
      • SXC
      • TMV
      • TMVT
      • TSV
      • WQ2
      • XAR
      • XL
      • XLA
      • XLAM
      • XLM
      • XLR
      • XLS
      • XLSB
      • XLSM
      • XLSMHTML
      • XLSX
      • XLT
      • XLTHTML
      • XLTM
      • XLTX
    • System File Formats
      • System File Formats
      • ADM
      • ADMX
      • AML
      • ANI
      • ASV
      • CAB
      • CFG
      • CPG
      • CPL
      • DESKTHEMEPACK
      • DLL
      • DMP
      • DRV
      • ETL
      • HDMP
      • HTT
      • ICNS
      • INI
      • INS
      • LNK
      • MANIFEST
      • MDMP
      • REG
      • REGTRANS-MS
      • RMT
      • SCR
      • SHSH
      • SHSH2
      • SYS
      • TMP
      • VGA
    • Video File Formats
      • Video File Formats
      • 3G2
      • 3GP
      • AEP
      • AMV
      • ARF
      • ASF
      • AVCHD
      • AVI
      • BIK
      • DAV
      • EXO
      • F4V
      • FLV
      • H264
      • H265
      • IDX
      • IFO
      • KINE
      • M2TS
      • M4S
      • M4V
      • MJPEG
      • MK3D
      • MKS
      • MKV
      • MOV
      • MP4
      • MPE
      • MPG
      • MPV
      • MSWMM
      • MTS
      • MXF
      • NSV
      • PIV
      • PRPROJ
      • PZ
      • QT
      • RM
      • RMVB
      • RV
      • SAMI
      • SEC
      • SRT
      • STR
      • TS
      • VEG
      • VID
      • VOB
      • VP6
      • VP8
      • VP9
      • VTT
      • WEBM
      • WLMP
      • WMV
      • XVID
    • Visio File Formats
      • Visio File Formats
      • VDW
      • VDX
      • VSD
      • VSDM
      • VSDX
      • VSS
      • VSSM
      • VSSX
      • VST
      • VSTM
      • VSTX
      • VSX
      • VTX
    • Web File Formats
      • Web File Formats
      • A4P
      • A5W
      • AAE
      • ADR
      • AEX
      • ALX
      • AN
      • AP
      • APKG
      • APPCACHE
      • ARO
      • ASA
      • ASAX
      • ASCX
      • ASHX
      • ASMX
      • ASP
      • ASPX
      • ASR
      • ATOM
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      • AWM
      • AXD
      • BML
      • BOK
      • BR
      • BWP
      • CDF
      • CER
      • CFM
      • CFML
      • CHA
      • CHAT
      • CHM
      • CMS
      • CODASITE
      • COMPRESSED
      • CON
      • CRDOWNLOAD
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      • CSHTML
      • CSP
      • CSR
      • CSS
      • DAP
      • DBM
      • DCR
      • DER
      • DHTML
      • DISCO
      • DISCOMAP
      • DML
      • DO
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      • DOTHTML
      • DOWNLOAD
      • DRAWIO
      • DWT
      • ECE
      • EDGE
      • EPIBRW
      • ESPROJ
      • EWP
      • FCGI
      • FMP
      • FREEWAY
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      • FWTEMPLATE
      • FWTEMPLATEB
      • GDOC
      • GDOCX
      • GNE
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      • HAR
      • HDM
      • HDML
      • HTACCESS
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      • HTML
      • HTX
      • HXS
      • HYPE
      • JHTML
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      • JSON
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      • KEY
      • KIT
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      • MHT
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      • MJS
      • OAM
      • OBML
      • OBML15
      • OBML16
      • OPDOWNLOAD
      • P7B
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      • PAC
      • PART
      • PEM
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      • RHTML
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      • RSS
      • Sass
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      • SHTML
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      • STC
      • STML
      • SVR
      • TPL
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      • URL
      • VDISCO
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      • WBS
      • WEBBOOKMARK
      • WEBLOC
      • WEBSITE
      • WHTT
      • WSDL
      • XAML
      • XD
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      • XHTM
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      • XML
      • XOJ
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      • XPD
      • XSLT
      • XUL
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    • Word Processing File Formats
      • Word Processing File Formats
      • ASD
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      • DOC to BMP
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      • DOC to DOCX
      • DOC to JPG
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      • DOCM
      • DOCX
      • DOCX to BMP
      • DOCX to DOC
      • DOCX to DOCM
      • DOCX to DOT
      • DOCX to DOTX
      • DOCX to EMF
      • DOCX to EPUB
      • DOCX to GIF
      • DOCX to HMTL
      • DOCX to JPEG
      • DOCX to JPG
      • DOCX to MD
      • DOCX to MHTML
      • DOCX to ODT
      • DOCX to PCL
      • DOCX to PDF
      • DOCX to PNG
      • DOCX to PPT
      • DOCX to PPTX
      • DOCX to PS
      • DOCX to RTF
      • DOCX to SVG
      • DOCX to TAR
      • DOCX to TIFF
      • DOCX to TXT
      • DOCX to WEBP
      • DOCX to XHTML
      • DOCX to XPS
      • DOCX to ZIP
      • DOCX Viewer
      • DOT
      • DOTM
      • DOTX
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      • FAQ
      • FODT
      • IPYNB
      • LATEX
      • LTX
      • MAN
      • MD
      • ODM
      • ODT
      • OTT
      • QBL
      • QPF
      • RTF
      • TXT
      • WPD
      • WPS
    1. Home
    2. 3D File Formats
    3. FBX

    What's on this Page

      • What is an FBX file?
      • FBX File Format - More Information
        • Text-Based File Structure
      • Binary File Structure of FBX Files
        • FBX Header
        • Object Record
        • Footer
      • Record Formats
        • Node Record Format
        • Property Record Format
        • Special Types
      • References

    What is an FBX file?

    FBX, FilmBox, is a popular 3D file format that was originally developed by Kaydara for MotionBuilder. It was acquired by Autodesk Inc in 2006 and is now one of the main 3D exchange formats as used by many 3D tools. FBX is available in both binary and ASCII file format. The format was established to provided interoperability between digital content creation applications. There are many tools available for conversion from/to FBX file format.

    FBX File Format - More Information

    FBX is a proprietary format and specifications about its binary file format are not available officially. A C++ FBX SDK is provided by Autodesk for reading, writing and conversion to/from FBX file. A Python import and export script for FBX is also available in Blender software that doesn’t use the FBX SDK.

    Text-Based File Structure

    The text-based file structure is a tree-structured documented with clearly named identifiers. It consists of a nested list of nodes arranged in hierarchy where each node has:

    • A NodeType identifier (class name)
    • A tuple of properties associated with it, the tuple elements are the usual primitive data types: ##float, integer, string## etc.
    • A list which contains nodes in the same format (recursively).

    These can be represented logically as follow:

    NodeType: SomeProperty0a, SomeProperty0b, ... , {
    
     NestedNodeType1 : SomeProperty1a, ...
     NestedNodeType2 : SomeProperty2a, ... , {
     ... Sub-scope
     }
    
     ...
    }
    

    Some of the standard nodes are defined as implicit list where each item consists of a nested list. Any application, that intends to access FBX geometry, has to parse these contents and make useful meaning of it. An example of text-based FBX file is as given below:

    ; FBX ...
    ; Copyright (C) 1997-2008 ...
    ; All rights reserved.
    ; ----------------------------------------------------
    FBXHeaderExtension: {
        FBXHeaderVersion: 1003
        FBXVersion: 6000
        CurrentCameraResolution: {
            CameraName: "Model::Producer Perspective"
            CameraResolutionMode: "Window Size"
            CameraResolutionW: 1
            CameraResolutionH: 1
        }
        CreationTimeStamp: {
        ...
        }
    }
    ;Object definitions
    ;------------------------------------------------------------------
    Definitions: {
        Count: 2
        ObjectType: "Model" {
        Count: 2
        }
    }
    ...
    

    Binary File Structure of FBX Files

    As stated earlier, FBX file format specifications are not available publicly for FBX. Since, Blender Foundation implements the FBX file format without using the company provided SDK, some of the details about binary file format are available as part of it implementation.

    The binary files structure  follows the following order:

    • Header
    • Object Record
    • Footer

    FBX Header

    The file header information is comprised of 27 bytes.

    • Bytes 0 - 20: Kaydara FBX Binary  \x00 (file-magic, with 2 spaces at the end, then a NULL terminator).
    • Bytes 21 - 22: [0x1A, 0x00]## (unknown but all observed files show these bytes).
    • Bytes 23 - 26: unsigned int, the version number. 7300 for version 7.3 for example.

    Object Record

    The Header is followed by an object record that is a full node record with empty name and empty property list. It recursively contains the entire file formation.

    Footer

    The FBX Footer section lies at the end of file whose contents are unknown.

    Record Formats

    Records in an FBX file are categorized as:

    • Node Records
    • Property Records

    Node Record Format

    Each Node Record Format is named and has the following memory layout.

    Size (Bytes)Date TypeName
    4UInt32EndOffset
    4UInt32NumProperties
    4UInt32PropertyListLen
    1UInt8NameLen
    NameLengthcharName
    ??Property[n], where n = 0:PropertyListLen
    Optional
    ??NestedList
    13uint8[]Null-Record

    where:

    • EndOffset is the distance from the beginning of the file to the end of the node record (i.e. the first byte of whatever comes next). This can be used to easily skip over unknown or not required records.
    • NumProperties is the number of properties in the value tuple associated with the node. A nested list as last element is not counted as property.
    • PropertyListLen is the length of the property list. This is the size required for storing ##NumProperties## properties, which depends on the data type of the properties.
    • NameLen is the length of the object name, in characters. The only case where this is 0 seems to be the lists top-level.
    • Name is the name of the object. There is no zero-termination.
    • Property[n] is the nth property. For the format, see section property Record Format. Properties are written sequentially and with no padding.
    • NestedList is the nested list, presence of which is indicated by a NULL–record at the very end.

    The existence of a nested list entry can be determined by checking if there are bytes left until the EndOffset is reached. If so, the next object record should be read directly following the last property. The object record then follows 13 zero bytes, which then combine with the EndOffset. The purpose or requirement of the NULL entry is not known and may point at some format feature.

    Property Record Format

    A property Record contains details about properties that are part of Node. A property record has the following memory layout:

    Size (Bytes)Data TypeName
    1charTypeCode
    ??Data

    TypeCode represent character codes which are ordered in groups that require similar handling. TypeCodes can be categorized in following types and TypeCode can be one of the character codes among these types.

    Primitive Types

    Y: 2 byte signed Integer
    C: 1 bit boolean (1: true, 0: false) encoded as the LSB of a 1 Byte value.
    I: 4 byte signed Integer
    F: 4 byte single-precision IEEE 754 number
    D: 8 byte double-precision IEEE 754 number
    L: 8 byte signed Integer
    

    Data in the primitive scalar type record is exactly the binary representation of the value, in little-endian byte order.

    Array Types

    f: Array of 4 byte single-precision IEEE 754 number
    d: Array of 8 byte double-precision IEEE 754 number
    l: Array of 8 byte signed Integer
    i: Array of 4 byte signed Integer
    b: Array of 1 byte Booleans (always 0 or 1)
    

    The Data for Array Type is more complex and is in the following structure.

    Size (Bytes)Data TypeName
    4Uint32ArrayLength
    4Uint32Encoding
    4Uint32CompressedLength
    ??Contents

    Special Types

    Following are the Special Types TypeCodes.

    S: String
    R: raw binary data
    

    Both of these TypeCodes are represented as follow:

    Size (Bytes)Data TypeName
    4Uin32Length
    Length

    The string is not zero-terminated, and may well contain \0 characters (this is actually used in some FBX properties).

    References

    • FBX - The Autodesk SDK
    • FBX Binary File Format Specifications
    • FBX - Wikipedia

    See Also

    • AVIF File Format
    • RA File Format
    • KT File Format
    • RM File Format
    • RV File Format
     
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