Official Open Asset Import Library Repository. Loads 40+ 3D file formats into one unified and clean data structure.
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kimkulling Merge pull request #2215 from ruyo/gltf_skinmesh
glTF2 importer multiple primitives and 16-bit index buffer skinmesh support.
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contrib MAke noexcept compiler-specific. Sep 21, 2018
doc Fix typos on documentation using codespell May 13, 2018
include/assimp closes #2199: introduce first version for exporter. Nov 12, 2018
packaging Update script.iss Jun 6, 2018
port Update AssimpNet redirect Oct 5, 2018
samples header paths adjusted for unit tests and samples Jan 6, 2018
scripts StepFile: introduce generated parser code. Oct 5, 2018
test closes #2199: introduce first version for exporter. Nov 12, 2018
tools added DropFaceNormals process Oct 29, 2018
.coveralls.yml Travis: enable coverall support. Nov 16, 2016
.editorconfig Implemented: Add editor config rules for *.txt files Jul 1, 2015
.gitattributes exclude repository-settings from source-package generated via 'git ar… Sep 3, 2017
.gitignore update gitignore Aug 9, 2018 Re-enable Clang static analysis Dec 2, 2017
.travis.yml Enable coveralls for export tests. Sep 25, 2018 Feature : Prepare FindPackage feature. May 28, 2012 - CMake overhaul. Add proper FindXXX scripts for PkgMacros, ZLIB, Dir… Jul 17, 2012 Update Oct 6, 2018
CHANGES Update CHANGES May 16, 2018
CMakeLists.txt Update CMakeLists.txt Oct 5, 2018 Improve the contribution guide Jun 10, 2018
CREDITS Initial FBX Export Support, sponsored by MyDidimo ( Feb 19, 2018 Change to what seems to be agreed upon (in line with PR #566) May 21, 2015
INSTALL Update INSTALL for iOS build Jun 12, 2018
LICENSE Fix missing includes. Mar 5, 2017
README Deprecate README Jan 20, 2013 Update Oct 6, 2018
appveyor.yml Update appveyor.yml Nov 8, 2018 CMake: Fix compatibility check for so-version of the assimp lib. Apr 6, 2017 Improved cmake configs for Windows and Linux. Sep 30, 2018 closes #1526: use correct include folder for assimp. Nov 5, 2017 Improved cmake configs for Windows and Linux. Sep 30, 2018 Improved cmake configs for Windows and Linux. Sep 30, 2018 Improved cmake configs for Windows and Linux. Sep 30, 2018 Refactor: Apply C++ conventions to Jun 28, 2015

Open Asset Import Library (assimp)

A library to import and export various 3d-model-formats including scene-post-processing to generate missing render data.

Current build status

Linux Build Status Windows Build Status Coverity Scan Build Status Coverage Status Join the chat at

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 repo containing the latest features and bugfixes. For productive use though, we recommend one of the stable releases available from Github Assimp Releases.

Monthly donations via Patreon:

One-off donations via PayPal:

Please check our Wiki as well:

If you want to check our Model-Database, use the following repo:

Supported file formats


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



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


Other tools

open3mod is a powerful 3D model viewer based on Assimp's import and export abilities.

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

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.


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 ...