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.

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.

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See the complete list of supported formats.

Start by reading our build instructions. We are available in vcpkg, and our build system is CMake; if you used CMake before there is a good chance you know what to do.

• Android
• Python
• .NET
• Pascal
• Javascript (Alpha)
• Javascript/Node.js Interface
• Unity 3d Plugin
• Unreal Engine Plugin
• JVM Full jvm port (current status)
• HAXE-Port The Assimp-HAXE-port.
• Rust

open3mod is a powerful 3D model viewer based on Assimp's import and export abilities. Assimp-Viewer is an experimental implementation for an Asset-Viewer based on ImGUI and Assimp (experimental).

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

/code		Source code
/contrib	Third-party libraries
/doc		Documentation (doxysource and pre-compiled docs)
/fuzz           Contains the test code for the Google Fuzzer project
/include	Public header C and C++ header files
/scripts 	Scripts are 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

The source code is organized in the following way:

code/Common			The base implementation for importers and the infrastructure
code/CApi                       Special implementations which are only used for the C-API
code/Geometry                   A collection of geometry tools
code/Material                   The material system
code/PBR                        An exporter for physical-based models
code/PostProcessing		The post-processing steps
code/AssetLib/<FormatName>	Implementation for import and export of the format

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.

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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.

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