diff --git a/04-3d-transforms/starter/3DTransforms.playground/Sources/Utility.swift b/04-3d-transforms/starter/3DTransforms.playground/Sources/Utility.swift
index 83d69ad..5c9a7e0 100644
--- a/04-3d-transforms/starter/3DTransforms.playground/Sources/Utility.swift
+++ b/04-3d-transforms/starter/3DTransforms.playground/Sources/Utility.swift
@@ -5,7 +5,7 @@ public typealias float4 = SIMD4<Float>
 
 public var device: MTLDevice!
 public let commandQueue = device.makeCommandQueue()!
-public let library = createLibrary()
+public let library = device.makeDefaultLibrary()!
 public let pipelineState = createPipelineState(library: library)
 
 public var lightGrayColor: float4 = [0.9, 0.9, 0.9, 1]
@@ -14,17 +14,6 @@ public var redColor: float4 = [1, 0, 0, 1]
 public func setupMetal() {
   
 }
-public func createLibrary() -> MTLLibrary {
-  var library: MTLLibrary?
-  do {
-    let path = Bundle.main.path(forResource: "Shaders", ofType: "metal")
-    let source = try String(contentsOfFile: path!, encoding: .utf8)
-    library = try device.makeLibrary(source: source, options: nil)
-  } catch let error as NSError {
-    fatalError("library error: " + error.description)
-  }
-  return library!
-}
 
 public func createPipelineState(library: MTLLibrary) -> MTLRenderPipelineState {
   let descriptor = MTLRenderPipelineDescriptor()