AssetPostprocessor.OnPostprocessMaterial(Material)

説明

Add this function to a subclass to get a notification when a Material asset has completed importing.

Use this method to modify the properties of newly created Material assets during import.

using UnityEngine;
using UnityEditor;

public class MakeMaterialsRed : AssetPostprocessor
{
    void OnPostprocessMaterial(Material material)
    {
        material.color = Color.red;
    }
}