AssetPostprocessor.OnPreprocessAsset()

説明

Add this function to a subclass to get a notification just before any Asset is imported.

これによりインポート設定をコードにより制御できます。

using UnityEditor;

class MyModelPostprocessor : AssetPostprocessor
{
    void OnPreprocessAsset()
    {
        if (assetImporter.importSettingsMissing)
        {
            ModelImporter modelImporter = assetImporter as ModelImporter;
            if (modelImporter != null)
            {
                if (!assetPath.Contains("@"))
                    modelImporter.importAnimation = false;
                modelImporter.importMaterials = false;
            }
        }
    }
}