Open Asset Import Library

Open Asset Import Library
Open Asset Import Library
Developer(s)	Alexander Gessler; Thomas Schulze; Kim Kulling, et al.
Stable release	6.0.2 / 8 June 2025; 2 months ago
Repository	github.com/assimp/assimp ;
Operating system	Cross-platform
Type	3D model import library
License	BSD
Website	www.assimp.org

Open Asset Import Library (Assimp) is a cross-platform 3D model import library which aims to provide a common application programming interface (API) for different 3D asset file formats. Written in C++, it offers interfaces for both C and C++. Bindings to other languages (e.g., BlitzMax, C#, Python) are developed as part of the project or are available elsewhere.^[2] Given the importance and benefits of Assimp, a pure Java (/Kotlin) port is being developed here.

The imported data is provided in a straightforward, hierarchical data structure. Configurable post processing steps (i.e., normal and tangent generation, various optimizations) augment the feature set.^[3]

Assimp currently supports 57 different file formats for reading, including COLLADA (.dae), 3DS, DirectX X, Wavefront OBJ and Blender 3D (.blend).^[4] As of Version 3.0 Assimp also provides export functionality for some file formats.^[5]

Projects using Assimp

Several open source projects use Assimp, such as MonoGame^[6] and Urho3D.^[7]

Resonite (and its predecessor NeosVR) – A social virtual reality platform that uses Assimp to import a wide range of 3D model formats, facilitating its real-time and collaborative content creation features. ^[8]^[9]

Torque3D added Assimp in Torque3D 4.0.^[10]

Godot added Assimp in Godot 3.2,^[11] but this was replaced in Godot 3.3 and later.^[12]^[13]

References

^ "Release 6.0.2". 8 June 2025. Retrieved 14 June 2025.
^ "Docs". Archived from the original on 2018-03-10. Retrieved 2018-03-10.
^ "Features".
^ "Features".
^ "Open Asset Import Library".
^ "MonoGame.Dependencies/Assimp at master · MonoGame/MonoGame.Dependencies". GitHub.
^ "urho3d/Source/ThirdParty/Assimp at master · urho3d/urho3d". GitHub.
^ "3D Model Import". NeosVR Wiki (Archived). 2018-04-21. Archived from the original on 2023-07-28. Retrieved 2025-07-18.
^ "FrooxEngine - Resonite Wiki". wiki.resonite.com. Retrieved 2025-07-18.
^ "Version 4.0". Torque3D.
^ Lee, K. S. Ernest (iFire) (2018-11-19). "Add Open Asset Importer to Godot". Godot. Retrieved 2023-08-21. Supports various formats from Open Asset Import Library (assimp). The focus is on FBX and MMD.
^ MacPherson, Gordon (2020-10-30). "FBX importer rewrite". Godot. Retrieved 2020-11-01. This is a complete rewrite of the importer. It will give more deterministic behavior. Over 1 year has gone into the development of this importer to remove the burden of the FBX SDK.
^ Lee, K. S. Ernest (iFire) (2022-03-28). "Add fbx2gltf support for importing .fbx files". Godot. Retrieved 2023-08-21. Lets you drag or place .fbx files in the project folder and it will import the files. An editor setting sets the location of the fbx2gltf binary.