Official Open Asset Import Library Repository. Loads 40+ 3D file formats into one unified and clean data structure.
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Open Asset Import Library (assimp)

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:

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

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 ...