# ModelImporterTangents

> Vertex tangent generation options for ModelImporter.

## Definition

* **Type:** Enum
* **Namespace:** [UnityEditor](/engine/6000.6/script-reference/unityeditor.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public enum ModelImporterTangents
```

## Remarks

Tangentss can either be imported from model file, calculated by Unity using several methods (default is MikkTSpace), or not included into imported mesh at all. Vertex tangents are most often used for normal/bump mapping.

Additional Resources: [ModelImporter.importTangents](/engine/6000.6/script-reference/unityeditor/modelimporter/importtangents.md), [ModelImporterNormals](/engine/6000.6/script-reference/unityeditor/modelimporternormals.md), [Mesh.tangents](/engine/6000.6/script-reference/unityengine/mesh/tangents.md).

## Fields

| Value                                                                                                                                     | Description                                                             |
| ----------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- |
| [CalculateLegacy](/engine/6000.6/script-reference/unityeditor/modelimportertangents/calculatelegacy.md)                                   | Calculate tangents with legacy algorithm.                               |
| [CalculateLegacyWithSplitTangents](/engine/6000.6/script-reference/unityeditor/modelimportertangents/calculatelegacywithsplittangents.md) | Calculate tangents with legacy algorithm, with splits across UV charts. |
| [CalculateMikk](/engine/6000.6/script-reference/unityeditor/modelimportertangents/calculatemikk.md)                                       | Calculate tangents using MikkTSpace (default).                          |
| [Import](/engine/6000.6/script-reference/unityeditor/modelimportertangents/import.md)                                                     | Import vertex tangents from model file.                                 |
| [None](/engine/6000.6/script-reference/unityeditor/modelimportertangents/none.md)                                                         | Do not import vertex tangents.                                          |