# Import CAD Models

AprtusVR uses [**Open Asset Import Library (assimp)**](https://github.com/assimp/assimp) to import files. You can read about the supported file formats here: <https://github.com/assimp/assimp> .

If your CAD models file format is not supperted then you can read about **converting CAD models** in [this](https://apertus.gitbook.io/vr/tutorials/convert-cad-models) tutorial. &#x20;

The converison to polygon mesh usually creates lots of polygons. If you want to **create a low-poly mesh** read [this](https://apertus.gitbook.io/vr/tutorials/create-low-poly-cad-models) tutorial.

After creating your low-poly mesh [this](https://apertus.gitbook.io/vr/tutorials/create-photorealistic-cad-models) tutorial will show you how to convert it to a **photorealistic gLTF file**.

See [this ](https://apertus.gitbook.io/vr/tutorials/introduction-how-to-visualize-cad-models)introduction page for step-by-step description how to use the VR application made by the libraries of ApertusVR.