# Tangent

> Tangent vectors for normal mapping.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine](/engine/6000.6/script-reference/unityengine.md)
* **Assembly:** UnityEngine.ParticleSystemModule

> **Warning:**
>
> **Deprecated.** ParticleSystemVertexStreams is deprecated. Please use ParticleSystemVertexStream instead.

```csharp
Tangent = 4
```