Official Open Asset Import Library Repository. Loads 40+ 3D file formats into one unified and clean data structure.
C++ Logos COBOL C Python Java Other
Latest commit c3bb2b6 Feb 21, 2017 @kimkulling kimkulling committed on GitHub Merge pull request #1181 from assimp/issue_1169
Issue-1169: fix [] operator of vector3.
Failed to load latest commit information.
cmake-modules Add missing cmake mocules Nov 16, 2016
code PLY: prepare bugfix by adding missing unittest. Feb 11, 2017
contrib Cleared majority of codepage warnings in Visual Studio 14. Jan 8, 2017
doc Renaming doc. Sep 17, 2016
include/assimp Issue-1169: add a unittest. Feb 21, 2017
packaging Update setup script. Oct 8, 2016
port Fix cpp std version at least c++11 Jan 25, 2017
samples Fixing bugs related to 64-bit upgrade in materials Aug 16, 2016
scripts GenBlenderDNA: use common formatting. Jan 16, 2017
test Issue-1169: add a unittest. Feb 21, 2017
tools Fixed build warnings on MSVC14 x64 in the write dumb source. Nov 27, 2016
.coveralls.yml Travis: enable coverall support. Nov 16, 2016
.editorconfig Implemented: Add editor config rules for *.txt files Jul 1, 2015
.gitattributes closes #1102: define line ending for missing files. Feb 11, 2017
.gitignore deleted code/MakeFile and added to .gitignore Oct 8, 2016 Remove deprecated boost workaround flag from travis config. Nov 17, 2016
.travis.yml Travis config: fix last merge issues + merge coverity check into mast… Nov 21, 2016 Feature : Prepare FindPackage feature. May 28, 2012 Refactored: Reformat CMake files to conform to editor config Jun 28, 2015 - CMake overhaul. Add proper FindXXX scripts for PkgMacros, ZLIB, Dir… Jul 17, 2012
CHANGES Issue-1169: fix [] operator of vector3. Feb 21, 2017
CMakeLists.txt Build: fix cmake warning: inconsistent name for if-endif. Jan 17, 2017
CREDITS CREDITS: first update. Aug 31, 2016 Change to what seems to be agreed upon (in line with PR #566) May 21, 2015
INSTALL Update INSTALL Nov 3, 2015
LICENSE License file: update to 2016 Jan 1, 2016
README Deprecate README Jan 20, 2013 use SVG in Travis badge Jan 14, 2017
appveyor.yml Fix appveyor build: disable bugger mingw config. Nov 28, 2016 fixed the broken cmake config files (assimp-cmake), adding version su… Feb 26, 2013 Fix spelling mistakes Apr 3, 2016 closes #938: adapt instal pathes. Jul 12, 2016 Refactor: Apply C++ conventions to Jun 28, 2015

Open Asset Import Library (assimp)

Linux Build Status Windows Build Status Coverity Scan Build Status Coverage Status

APIs are provided for C and C++. There are various bindings to other languages (C#, Java, Python, Delphi, D). Assimp also runs on Android and iOS.

Additionally, assimp features various mesh post processing tools: normals and tangent space generation, triangulation, vertex cache locality optimization, removal of degenerate primitives and duplicate vertices, sorting by primitive type, merging of redundant materials and many more.

This is the development trunk containing the latest features and bugfixes. For productive use though, we recommend one of the stable releases available from or from *nix package repositories. The current build status is:

Gitter chat: Join the chat at
open3mod is a powerful 3D model viewer based on Assimp's import and export abilities.

Please check our Wiki as well:

Supported file formats

A full list is here. Importers:

  • 3DS
  • BLEND (Blender)
  • DAE/Collada
  • FBX
  • ASE
  • DXF
  • HMP
  • MD2
  • MD3
  • MD5
  • MDC
  • MDL
  • NFF
  • PLY
  • STL
  • X
  • OBJ
  • OpenGEX
  • SMD
  • LWO
  • LXO
  • LWS
  • TER
  • AC3D
  • MS3D
  • COB
  • Q3BSP
  • XGL
  • CSM
  • BVH
  • B3D
  • NDO
  • Ogre Binary
  • Ogre XML
  • Q3D
  • ASSBIN (Assimp custom format)
  • glTF (partial)
  • 3MF

Additionally, some formats are supported by dependency on non-free code or external SDKs (not built by default):



Take a look into the INSTALL file. Our build system is CMake, if you used CMake before there is a good chance you know what to do.


Repository structure

Open Asset Import Library is implemented in C++. The directory structure is:

/code       Source code
/contrib    Third-party libraries
/doc        Documentation (doxysource and pre-compiled docs)
/include    Public header C and C++ header files
/scripts    Scripts used to generate the loading code for some formats
/port       Ports to other languages and scripts to maintain those.
/test       Unit- and regression tests, test suite of models
/tools      Tools (old assimp viewer, command line `assimp`)
/samples    A small number of samples to illustrate possible
                    use cases for Assimp
/workspaces Build environments for vc,xcode,... (deprecated,
        CMake has superseeded all legacy build options!)

Where to get help

For more information, visit our website. Or check out the ./doc- folder, which contains the official documentation in HTML format. (CHMs for Windows are included in some release packages and should be located right here in the root folder).

If the docs don't solve your problem, ask on StackOverflow. If you think you found a bug, please open an issue on Github.

For development discussions, there is also a (very low-volume) mailing list, assimp-discussions (subscribe here)

Open Asset Import Library is a library to load various 3d file formats into a shared, in-memory format. It supports more than 40 file formats for import and a growing selection of file formats for export.

And we also have a Gitter-channel:Gitter Join the chat at


Contributions to assimp are highly appreciated. The easiest way to get involved is to submit a pull request with your changes against the main repository's master branch.


If you like assimp, consider buying us a beer (or two): Donate


Our license is based on the modified, 3-clause BSD-License.

An informal summary is: do whatever you want, but include Assimp's license text with your product - and don't sue us if our code doesn't work. Note that, unlike LGPLed code, you may link statically to Assimp. For the legal details, see the LICENSE file.

Why this name

Sorry, we're germans :-), no english native speakers ...