Unity3D Material Replace Editor

ReplaceMaterials.cs

using UnityEngine;
using UnityEditor;
public class ReplaceMaterials : EditorWindow {
  static int goCount = 0, replaceCount = 0;
	private Material currentMaterial = null;
	private Material replaceMaterial = null;

	[MenuItem("Stuff/Replace Materials")]
	public static void ShowWindow() {
		EditorWindow.GetWindow(typeof(ReplaceMaterials));
	}

	public void OnGUI() {
		currentMaterial = EditorGUILayout.ObjectField("Material", currentMaterial, typeof(Material), false) as Material;
		string matName = (currentMaterial != null) ? currentMaterial.name : "null";

		if(GUILayout.Button("Replace All Materials with "+matName+" (Recursive)")) {
			replaceMaterial = null;
			ReplaceSelected(currentMaterial, replaceMaterial, true);
		}

		if(GUILayout.Button("Replace Materials with"+matName)) {
			replaceMaterial = null;
			ReplaceSelected(currentMaterial, replaceMaterial, false);
		}

		replaceMaterial = EditorGUILayout.ObjectField("Replace Material", replaceMaterial, typeof(Material), false) as Material;
		string reMatName = (replaceMaterial != null) ? replaceMaterial.name : "null";

		if(GUILayout.Button("Replace All "+reMatName+" with "+matName+" (Recursive)")) {
			ReplaceSelected(currentMaterial, replaceMaterial, true);
		}
		if(GUILayout.Button("Replace "+reMatName+" with "+matName)) {
			ReplaceSelected(currentMaterial, replaceMaterial, false);
		}
	}

	private static void ReplaceSelected(Material material, Material replaceMaterial, bool recursive) {
		GameObject[] go = Selection.gameObjects;
		goCount = 0;
		replaceCount = 0;
		foreach(GameObject g in go) {
			ReplaceInGO(g, material, replaceMaterial, recursive);
		}
		Debug.Log(string.Format("Searched {0} GameObjects, replaced {2} materials", goCount, replaceCount));
	}

	private static void ReplaceInGO(GameObject g, Material material, Material replaceMaterial, bool recursive) {
		goCount++;

		MeshRenderer[] mrs = g.GetComponentsInChildren<MeshRenderer>();
		foreach(MeshRenderer mr in mrs) {
			if(replaceMaterial == null ||  mr.sharedMaterial == replaceMaterial) {
				replaceCount++;
				mr.sharedMaterial = material;
			}
		}

		SkinnedMeshRenderer[] smrs = g.GetComponentsInChildren<SkinnedMeshRenderer>();
		foreach(SkinnedMeshRenderer smr in smrs) {
			if(replaceMaterial == null ||  smr.sharedMaterial == replaceMaterial) {
				replaceCount++;
				smr.sharedMaterial = material;
			}
		}

		if(recursive)
			foreach(Transform childT in g.transform)
				ReplaceInGO(childT.gameObject, material, replaceMaterial, recursive);
	}
}