diff --git a/Sources/glTFSceneKit/GLTF+Animation.swift b/Sources/glTFSceneKit/GLTF+Animation.swift
index 9ffbc7e..2b087ab 100644
--- a/Sources/glTFSceneKit/GLTF+Animation.swift
+++ b/Sources/glTFSceneKit/GLTF+Animation.swift
@@ -127,37 +127,37 @@ extension GLTF {
         var values = [Any]()
         switch componentType {
         case .BYTE:
-            values = data.int8Array
+            values = data.array() as [Int8]
             break
         case .UNSIGNED_BYTE:
-            values = data.uint8Array
+            values = data.array() as [UInt8]
             break
         case .SHORT:
-            values = data.int16Array
+            values = data.array() as [Int16]
             break
         case .UNSIGNED_SHORT:
-            values = data.uint16Array
+            values = data.array() as [UInt16]
             break
         case .UNSIGNED_INT:
-            values = data.uint32Array
+            values = data.array() as [UInt32]
             break
         case .FLOAT: 
             do {
                 switch type {
                 case .SCALAR:
-                    values = data.floatArray
+                    values = data.array() as [Float]
                     break
                 case .VEC2:
-                    values = data.vec2Array 
+                    values = data.array() as [SCNVector2]
                     break
                 case .VEC3:
-                    values = data.vec3Array
+                    values = data.array() as [GLKVector3]
                     for i in 0..<values.count {
                         values[i] = SCNVector3FromGLKVector3(values[i] as! GLKVector3)
                     }
                     break
                 case .VEC4:
-                    values = data.vec4Array
+                    values = data.array() as [GLKVector4]
                     for i in 0..<values.count {
                         values[i] = SCNVector4FromGLKVector4(values[i] as! GLKVector4)
                     }
@@ -167,7 +167,7 @@ extension GLTF {
                 case .MAT3:
                     break
                 case .MAT4:
-                    values = data.mat4Array
+                    values = data.array() as [GLKMatrix4]
                     for i in 0..<values.count {
                         values[i] = SCNMatrix4FromGLKMatrix4(values[i] as! GLKMatrix4)
                     }
diff --git a/Sources/glTFSceneKit/GLTF+CompressedTexture.swift b/Sources/glTFSceneKit/GLTF+CompressedTexture.swift
index 04ca4bc..af272d2 100644
--- a/Sources/glTFSceneKit/GLTF+CompressedTexture.swift
+++ b/Sources/glTFSceneKit/GLTF+CompressedTexture.swift
@@ -124,11 +124,13 @@ extension GLTF {
         for i in 0 ..< mipmapsCount {
             let data = mipmaps[i]
             let bPr = bppBlock(width, height)
-            data.withUnsafeBytes {
-                texture?.replace(region: MTLRegionMake2D(0, 0, width, height), 
-                                 mipmapLevel: i, 
-                                 withBytes: $0, 
-                                 bytesPerRow: bPr)
+            data.withUnsafeBytes { (unsafeBufferPointer:UnsafeRawBufferPointer) in
+                if let unsafePointer = unsafeBufferPointer.bindMemory(to: UInt8.self).baseAddress {
+                    texture?.replace(region: MTLRegionMake2D(0, 0, width, height),
+                                     mipmapLevel: i,
+                                     withBytes: unsafePointer,
+                                     bytesPerRow: bPr)
+                }
             }
             
             width = max(width >> 1, 1);
diff --git a/Sources/glTFSceneKit/GLTF+Resources.swift b/Sources/glTFSceneKit/GLTF+Resources.swift
index def4e71..ab6f595 100644
--- a/Sources/glTFSceneKit/GLTF+Resources.swift
+++ b/Sources/glTFSceneKit/GLTF+Resources.swift
@@ -137,7 +137,7 @@ open class GLTFResourceLoaderDefault : GLTFResourceLoader {
                 throw "Can't find file at \(filepath)"
             }
         } else {
-            return (data == nil) ? nil : Data(bytes: [UInt8](data!))
+            return (data == nil) ? nil : Data([UInt8](data!))
         }
         return data
     }    
diff --git a/Sources/glTFSceneKit/GLTF+SceneKit.swift b/Sources/glTFSceneKit/GLTF+SceneKit.swift
index 30c28c8..2a041e2 100644
--- a/Sources/glTFSceneKit/GLTF+SceneKit.swift
+++ b/Sources/glTFSceneKit/GLTF+SceneKit.swift
@@ -133,9 +133,7 @@ extension GLTF {
         // Get dispatch group for current GLTF 
         let convertGroup = self.nodesDispatchGroup
         convertGroup.enter()
-        
-//        let geometryGroup = DispatchGroup()
-        
+                
         if self.scenes != nil && self.scene != nil {
             let sceneGlTF = self.scenes![(self.scene)!]
             if let sceneName = sceneGlTF.name {
diff --git a/Sources/glTFSceneKit/Helper.swift b/Sources/glTFSceneKit/Helper.swift
index dc6ed80..5ce9d21 100644
--- a/Sources/glTFSceneKit/Helper.swift
+++ b/Sources/glTFSceneKit/Helper.swift
@@ -80,98 +80,9 @@ extension String {
 }
 
 extension Data {
-    var int8: Int8 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var uint8: UInt8 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var int16: Int16 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var uint16: UInt16 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var int32: Int32 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var uint32: UInt32 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var integer: Int {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var uinteger: UInt {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var float: Float {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var double: Double {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var vec2: SCNVector2 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var vec3: SCNVector3 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var vec4: SCNVector4 {
-        return withUnsafeBytes { $0.pointee }
-    }
-    var int8Array: [Int8] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<Int8>(start: $0, count: self.count/MemoryLayout<Int8>.size)) 
-        }
-    }
-    var uint8Array: [UInt8] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<UInt8>(start: $0, count: self.count/MemoryLayout<UInt8>.size)) 
-        }
-    }
-    var int16Array: [Int16] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<Int16>(start: $0, count: self.count/MemoryLayout<Int16>.size)) 
-        }
-    }
-    var uint16Array: [UInt16] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<UInt16>(start: $0, count: self.count/MemoryLayout<UInt16>.size)) 
-        }
-    }
-    var int32Array: [Int32] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<Int32>(start: $0, count: self.count/MemoryLayout<Int32>.size)) 
-        }
-    }
-    var uint32Array: [UInt32] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<UInt32>(start: $0, count: self.count/MemoryLayout<UInt32>.size)) 
-        }
-    }
-    var floatArray: [Float] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<Float>(start: $0, count: self.count/MemoryLayout<Float>.size)) 
-        }
-    }
-    var vec2Array: [GLKVector2] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<GLKVector2>(start: $0, count: self.count/MemoryLayout<GLKVector2>.size)) 
-        }
-    }
-    var vec3Array: [GLKVector3] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<GLKVector3>(start: $0, count: self.count/MemoryLayout<GLKVector3>.size)) 
-        }
-    }
-    var vec4Array: [GLKVector4] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<GLKVector4>(start: $0, count: self.count/MemoryLayout<GLKVector4>.size)) 
-        }
-    }
-    var mat4Array: [GLKMatrix4] {
-        return withUnsafeBytes { 
-            Array(UnsafeBufferPointer<GLKMatrix4>(start: $0, count: self.count/MemoryLayout<GLKMatrix4>.size)) 
+    func array<Type>() -> [Type] {
+        return withUnsafeBytes { (unsafeBufferPointer:UnsafeRawBufferPointer) -> [Type] in
+            Array(UnsafeBufferPointer<Type>(start: unsafeBufferPointer.bindMemory(to: Type.self).baseAddress, count: self.count/MemoryLayout<Type>.size))
         }
     }
 }
diff --git a/Tests/glTFSceneKitTests/gltf_scenekitTests.swift b/Tests/glTFSceneKitTests/gltf_scenekitTests.swift
index 94141e9..e4592e8 100644
--- a/Tests/glTFSceneKitTests/gltf_scenekitTests.swift
+++ b/Tests/glTFSceneKitTests/gltf_scenekitTests.swift
@@ -19,10 +19,13 @@ class gltf_scenekitTests: XCTestCase {
         self.measure {
             let glTF = try? decoder.decode(GLTF.self, from: jsonData!)
             
-            _ = glTF?.convert(renderer:view, directoryPath:nil, multiThread:false)
+            _ = glTF?.convert(renderer:view, directoryPath:nil, multiThread:false, geometryCompletionHandler: {
+                
+            })
             
         }
         
+        let jsonDataArray = jsonData!.array() as [UInt8]
         
 //        XCTAssert(glTF != nil)
         
diff --git a/glTFSceneKit.xcodeproj/project.pbxproj b/glTFSceneKit.xcodeproj/project.pbxproj
index 7e43faf..804195f 100644
--- a/glTFSceneKit.xcodeproj/project.pbxproj
+++ b/glTFSceneKit.xcodeproj/project.pbxproj
@@ -951,7 +951,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				ONLY_ACTIVE_ARCH = YES;
 				OTHER_SWIFT_FLAGS = "-DXcode";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -999,7 +999,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 10.10;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				OTHER_CFLAGS = "-fembed-bitcode";
 				OTHER_SWIFT_FLAGS = "-DXcode";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1085,7 +1085,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
 				LIBRARY_SEARCH_PATHS = "$(PROJECT_DIR)/Draco";
 				MACH_O_TYPE = mh_dylib;
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-lc++",
@@ -1120,7 +1120,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
 				LIBRARY_SEARCH_PATHS = "$(PROJECT_DIR)/Draco";
 				MACH_O_TYPE = mh_dylib;
-				MACOSX_DEPLOYMENT_TARGET = 10.13;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-lc++",