using UnityEditor;
using UnityEngine;
public class CharacterShaderEditor : ShaderGUI
{
    private bool init;
    private Vector3 lastEular;
    public override void OnGUI(MaterialEditor materialEditor, MaterialProperty[] properties)
    {
        base.OnGUI(materialEditor, properties);
        var targetMat = (Material)materialEditor.target;
        if (init)
        {
            var eular = EditorGUILayout.Vector3Field("Eular", lastEular);
            if (eular != lastEular)
            {
                lastEular = eular;
                var direction = Quaternion.Euler(eular) * Vector3.forward;
                targetMat.SetVector("_LightDir", direction);
            }
        }
        else
        {
            init = true;
            var direction = (Vector3)targetMat.GetVector("_LightDir");
            lastEular = Quaternion.FromToRotation(Vector3.forward, direction).eulerAngles;
            EditorGUILayout.Vector3Field("Light Eular", lastEular);
        }
    }
}