AssetPostprocessor.OnPreprocessTexture()

Description

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

借助此函数，您可以设置导入设置的默认值。

如果要更改纹理数据以执行 Alpha 左乘之类的操作，请使用 textureImporter.isReadable 在 OnPostprocessTexture 中将纹理标记为可读。

如果要更改纹理的压缩格式，请在此处更改。

using UnityEngine;
using UnityEditor;

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

class MyTexturePostprocessor : AssetPostprocessor
{
    void OnPreprocessTexture()
    {
        if (assetPath.Contains("_bumpmap"))
        {
            TextureImporter textureImporter  = (TextureImporter)assetImporter;
            textureImporter.convertToNormalmap = true;
        }
    }
}