# OnPreprocessTexture()

> Add this function to a subclass to get a notification just before the texture importer is run.

## Definition

* **Type:** Method
* **Namespace:** [UnityEditor](/engine/6000.7/script-reference/unityeditor.md)

```csharp
public void OnPreprocessTexture()
```

### Remarks

This lets you set up default values for the import settings. Use this callback if you want to change the compression format of the texture.

### Examples

```csharp

using UnityEngine;
using UnityEditor;

// Automatically convert any texture file with "_bumpmap"
// in its file name into a normal map.

class MyTexturePostprocessor : AssetPostprocessor
{
    // Increment the version number, when the AssetPostprocessors code/behavior is changed
    static readonly uint k_Version = 0;
    public override uint GetVersion() { return k_Version; }

    void OnPreprocessTexture()
    {
        if (assetPath.Contains("_bumpmap"))
        {
            TextureImporter textureImporter  = (TextureImporter)assetImporter;
            textureImporter.convertToNormalmap = true;
        }
    }
}
```