シェーダーを使用しているマテリアルの一覧を取得

SearchMaterialUseShader.cs

using UnityEngine;
using System.Collections.Generic;
using UnityEditor;
using System.IO;
using System.Linq;

public class SearchMaterialUseShader : EditorWindow 
{
	const string menuItemName = "Assets/Find/shader <- material";
	[MenuItem(menuItemName, false, 53)]
	static void Init()
	{
		var window = SearchMaterialUseShader.CreateInstance<SearchMaterialUseShader> ();
		window.CollectionFileReferenceList();
		window.Search(Selection.activeObject);
		window.Show ();
	}

	[MenuItem (menuItemName, true)]
	static bool ValidateLogSelectedTransformName () {
		if( Selection.activeObject == null ){
			return false;
		}
		var path = AssetDatabase.GetAssetPath(Selection.activeObject);
		return Path.GetExtension(path) == ".shader";
	}


	Vector2 scrollPos;
	string[] searchResults;

	void OnGUI()
	{
		using( var horizonal = new EditorGUILayout.HorizontalScope()){
			if( GUILayout.Button("select all material", EditorStyles.toolbarButton)){
				Selection.objects = referencedByList
					.Select( c => AssetDatabase.LoadAssetAtPath<Object>(c))
					.ToArray();
			}
		}
		using( var scroll = new EditorGUILayout.ScrollViewScope(scrollPos) ){
			scrollPos = scroll.scrollPosition;

			foreach( var filereference in referencedByList ){
				using( var horizonal = new EditorGUILayout.HorizontalScope())
				{
					var icon = AssetDatabase.GetCachedIcon (filereference);
					GUILayout.Label (icon, GUILayout.Width (20), GUILayout.Height (20));
					
					if( GUILayout.Button(filereference, EditorStyles.label) ){
						Selection.activeObject = AssetDatabase.LoadAssetAtPath<Object>(filereference);
					}
				}
			}
		}
	}

	List<Reference> fileReferenceList = new List<Reference>();
	string[] referencedByList = new string[0]{};

	void Search(Object target)
	{

		var path = AssetDatabase.GetAssetPath(target);
		var guid = AssetDatabase.AssetPathToGUID(path);

		referencedByList = fileReferenceList
			.Where(c=> c.from != path)
			.Where(c=> c.to == guid)
			.Select(c=>c.from).ToArray();
	}

	void CollectionFileReferenceList()
	{
		fileReferenceList.Clear();
		var allMaterialFiles = Directory.GetFiles("Assets", "*.mat", SearchOption.AllDirectories);
		foreach( var materialFile in allMaterialFiles ){
			var referenceList = AssetDatabase.GetDependencies(new string[]{materialFile});

			foreach( var reference in referenceList){
				fileReferenceList.Add( new Reference(){
					from = materialFile,
					to = AssetDatabase.AssetPathToGUID(reference)
				});
			}
		}
	}

	class Reference
	{
		public string from;
		public string to;
	}
}

how to use

Porjectビューでシェーダーを選択して
右クリック -> find -> Material use shader.