BatchChangeGI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

#if UNITY_EDITOR
using UnityEditor;
#endif

public class GIDisabler : EditorWindow
{

    static float volume = 0f;
    static GameObject selectedGo;


    static void show(string inText)
    {
        EditorWindow.GetWindow<SceneView>().ShowNotification(new GUIContent(inText));
    }


    public static string GetPrefabPath(Object asset)
    {
        string AssetPath = string.Empty;

        Object targetObj = PrefabUtility.GetCorrespondingObjectFromSource<Object>(asset);

        AssetPath = AssetDatabase.GetAssetPath(targetObj);

        if (AssetPath == string.Empty)
            Debug.LogWarning("Cound not find AssetPath : " + asset.ToString());

        return AssetPath;
    }


    [MenuItem("DEBUG/GI Disabler")]
    static void RunGIDisabler()
    {

        int GIDisabledcount = 0;

        if (Selection.activeGameObject == null)
        {
            show("Need to select one GameObject");
            return;
        }

        MeshRenderer currentRender = Selection.activeGameObject.GetComponent<MeshRenderer>();

        if (currentRender == null)
        {
            show("Could not find MeshRenderer in the selected GameObject.");
            return;
        }

        Vector3 dimension = currentRender.bounds.max - currentRender.bounds.min;
        volume = currentRender.bounds.size.x * currentRender.bounds.size.y * currentRender.bounds.size.z;

        show("Volume standard : " + volume.ToString() + " m³");


        selectedGo = currentRender.gameObject;


        
        MeshRenderer[] renders = Component.FindObjectsOfType<MeshRenderer>();



        ArrayList exceptionalCase = new ArrayList();

        exceptionalCase.Add("Assets/projects/City Bus/prefabs/city bus.prefab");
        exceptionalCase.Add("Assets/projects/City Bus/prefabs/Lowpoly_CityBus_blue.prefab");
        exceptionalCase.Add("Assets/projects/City Bus/prefabs/Lowpoly_CityBus_white.prefab");
        exceptionalCase.Add("Assets/Vehicle - pro 3d models/Car1/Prefabs/Police.prefab");
        exceptionalCase.Add("Assets/Vehicle - pro 3d models/Car1/Prefabs/Taxi.prefab");
        exceptionalCase.Add("Assets/Art/Prefab/Vehicles/MiniVan_A/MiniVan_A.prefab");
        exceptionalCase.Add("Assets/Art/Prefab/Vehicles/Scooter_A/Scooter_A.prefab");



        foreach (MeshRenderer render in renders)
        {
            float currentVolume = render.bounds.size.x * render.bounds.size.y * render.bounds.size.z;

            if (currentVolume <= volume)
            {
                render.gameObject.isStatic = false;

                render.receiveGI = ReceiveGI.Lightmaps;
                GIDisabledcount++;
            }
            else
            {
                string prefabPath = GetPrefabPath(render.gameObject);

                if (exceptionalCase.Contains(prefabPath))
                {
                    render.gameObject.isStatic = false;
                    GIDisabledcount++;
                    continue;
                }

                //render.gameObject.isStatic = true;
                GameObjectUtility.SetStaticEditorFlags(render.gameObject, StaticEditorFlags.ContributeGI);
                render.receiveGI = ReceiveGI.Lightmaps;
            }

        }

        show("Disabled GI Count : " + GIDisabledcount.ToString() + " / " + renders.Length.ToString());        

        
    }