# 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: . If your CAD models file format is not supperted then you can read about **converting CAD models** in [this](/vr/tutorials/convert-cad-models.md) tutorial. The converison to polygon mesh usually creates lots of polygons. If you want to **create a low-poly mesh** read [this](/vr/tutorials/create-low-poly-cad-models.md) tutorial. After creating your low-poly mesh [this](/vr/tutorials/create-photorealistic-cad-models.md) tutorial will show you how to convert it to a **photorealistic gLTF file**. See [this ](/vr/tutorials/introduction-how-to-visualize-cad-models.md)introduction page for step-by-step description how to use the VR application made by the libraries of ApertusVR. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://apertus.gitbook.io/vr/tutorials/import-cad-models.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.