diff --git a/GLTFSceneKit.xcodeproj/project.pbxproj b/GLTFSceneKit.xcodeproj/project.pbxproj
index 9b08492a..dd87875c 100644
--- a/GLTFSceneKit.xcodeproj/project.pbxproj
+++ b/GLTFSceneKit.xcodeproj/project.pbxproj
@@ -7,6 +7,20 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		2238AE2220DDC47900E2FEA0 /* GLTFShaderModifierSurface.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD071E031F55ED1200F00567 /* GLTFShaderModifierSurface.shader */; };
+		2238AE2320DDC47900E2FEA0 /* GLTFShaderModifierSurface_alphaModeBlend.shader in Resources */ = {isa = PBXBuildFile; fileRef = 9DA74DB31FD5F54F007F0749 /* GLTFShaderModifierSurface_alphaModeBlend.shader */; };
+		2238AE2420DDC47900E2FEA0 /* GLTFShaderModifierSurface_doubleSidedWorkaround.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD99E8071F55FBA8003D380A /* GLTFShaderModifierSurface_doubleSidedWorkaround.shader */; };
+		2238AE2520DDC47900E2FEA0 /* GLTFShaderModifierFragment_alphaCutoff.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD99E80A1F560099003D380A /* GLTFShaderModifierFragment_alphaCutoff.shader */; };
+		2238AE2620DDC47900E2FEA0 /* GLTFShaderModifierSurface.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD071E031F55ED1200F00567 /* GLTFShaderModifierSurface.shader */; };
+		2238AE2720DDC47900E2FEA0 /* GLTFShaderModifierSurface_alphaModeBlend.shader in Resources */ = {isa = PBXBuildFile; fileRef = 9DA74DB31FD5F54F007F0749 /* GLTFShaderModifierSurface_alphaModeBlend.shader */; };
+		2238AE2820DDC47900E2FEA0 /* GLTFShaderModifierSurface_doubleSidedWorkaround.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD99E8071F55FBA8003D380A /* GLTFShaderModifierSurface_doubleSidedWorkaround.shader */; };
+		2238AE2920DDC47900E2FEA0 /* GLTFShaderModifierFragment_alphaCutoff.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD99E80A1F560099003D380A /* GLTFShaderModifierFragment_alphaCutoff.shader */; };
+		2238AE2A20DDC48700E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_doubleSidedWorkaround.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD9BFA8A1F9C2DA000542D5B /* GLTFShaderModifierSurface_pbrSpecularGlossiness_doubleSidedWorkaround.shader */; };
+		2238AE2B20DDC48700E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_texture_doubleSidedWorkaround.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD8804E31FA7AC91009B4584 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_texture_doubleSidedWorkaround.shader */; };
+		2238AE2C20DDC48700E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD9BFA7E1F9C11EA00542D5B /* GLTFShaderModifierSurface_pbrSpecularGlossiness.shader */; };
+		2238AE2D20DDC48800E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_doubleSidedWorkaround.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD9BFA8A1F9C2DA000542D5B /* GLTFShaderModifierSurface_pbrSpecularGlossiness_doubleSidedWorkaround.shader */; };
+		2238AE2E20DDC48800E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_texture_doubleSidedWorkaround.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD8804E31FA7AC91009B4584 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_texture_doubleSidedWorkaround.shader */; };
+		2238AE2F20DDC48800E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness.shader in Resources */ = {isa = PBXBuildFile; fileRef = DD9BFA7E1F9C11EA00542D5B /* GLTFShaderModifierSurface_pbrSpecularGlossiness.shader */; };
 		9DA74DB61FD5F8D9007F0749 /* GLTFShaderModifierSurface_alphaModeBlend.shader in Resources */ = {isa = PBXBuildFile; fileRef = 9DA74DB31FD5F54F007F0749 /* GLTFShaderModifierSurface_alphaModeBlend.shader */; };
 		9DA74DB71FD5FBAC007F0749 /* GLTFShaderModifierSurface_alphaModeBlend.shader in Resources */ = {isa = PBXBuildFile; fileRef = 9DA74DB31FD5F54F007F0749 /* GLTFShaderModifierSurface_alphaModeBlend.shader */; };
 		DD10459A1F47723D004B20CE /* GLTFTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = DD1045991F47723D004B20CE /* GLTFTypes.swift */; };
@@ -571,7 +585,7 @@
 					};
 					DD83924B1F466C2D006A1CAC = {
 						CreatedOnToolsVersion = 9.0;
-						ProvisioningStyle = Manual;
+						ProvisioningStyle = Automatic;
 					};
 					DDB221D91F525D6E002CFA4D = {
 						CreatedOnToolsVersion = 9.0;
@@ -641,8 +655,15 @@
 			buildActionMask = 2147483647;
 			files = (
 				DDB221FB1F525EC9002CFA4D /* LaunchScreen.storyboard in Resources */,
+				2238AE2D20DDC48800E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_doubleSidedWorkaround.shader in Resources */,
+				2238AE2720DDC47900E2FEA0 /* GLTFShaderModifierSurface_alphaModeBlend.shader in Resources */,
+				2238AE2F20DDC48800E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness.shader in Resources */,
+				2238AE2620DDC47900E2FEA0 /* GLTFShaderModifierSurface.shader in Resources */,
 				DDB221FA1F525EC3002CFA4D /* Assets.xcassets in Resources */,
 				DDB221F91F525EBA002CFA4D /* art.scnassets in Resources */,
+				2238AE2920DDC47900E2FEA0 /* GLTFShaderModifierFragment_alphaCutoff.shader in Resources */,
+				2238AE2820DDC47900E2FEA0 /* GLTFShaderModifierSurface_doubleSidedWorkaround.shader in Resources */,
+				2238AE2E20DDC48800E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_texture_doubleSidedWorkaround.shader in Resources */,
 				DDB221FC1F525ECE002CFA4D /* Main.storyboard in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -651,9 +672,16 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				2238AE2A20DDC48700E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_doubleSidedWorkaround.shader in Resources */,
+				2238AE2420DDC47900E2FEA0 /* GLTFShaderModifierSurface_doubleSidedWorkaround.shader in Resources */,
 				DDE6FDC81F4671B900CB11D6 /* art.scnassets in Resources */,
+				2238AE2520DDC47900E2FEA0 /* GLTFShaderModifierFragment_alphaCutoff.shader in Resources */,
 				DDE6FDCA1F4671C400CB11D6 /* Assets.xcassets in Resources */,
+				2238AE2220DDC47900E2FEA0 /* GLTFShaderModifierSurface.shader in Resources */,
 				DDE6FDD61F46764500CB11D6 /* MainMenu.xib in Resources */,
+				2238AE2C20DDC48700E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness.shader in Resources */,
+				2238AE2B20DDC48700E2FEA0 /* GLTFShaderModifierSurface_pbrSpecularGlossiness_texture_doubleSidedWorkaround.shader in Resources */,
+				2238AE2320DDC47900E2FEA0 /* GLTFShaderModifierSurface_alphaModeBlend.shader in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -1035,7 +1063,7 @@
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
-				DEVELOPMENT_TEAM = EF37D6UQZ9;
+				DEVELOPMENT_TEAM = MJLARYDQWH;
 				INFOPLIST_FILE = "$(SRCROOT)/Sample/iOS/Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
@@ -1053,7 +1081,7 @@
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
-				DEVELOPMENT_TEAM = EF37D6UQZ9;
+				DEVELOPMENT_TEAM = MJLARYDQWH;
 				INFOPLIST_FILE = "$(SRCROOT)/Sample/iOS/Info.plist";
 				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
diff --git a/Sample/Common/art.scnassets/gltf/9eeb307f-6819-4645-a357-ea8cd16d1183 b/Sample/Common/art.scnassets/gltf/9eeb307f-6819-4645-a357-ea8cd16d1183
new file mode 100644
index 00000000..d6fcac82
Binary files /dev/null and b/Sample/Common/art.scnassets/gltf/9eeb307f-6819-4645-a357-ea8cd16d1183 differ
diff --git a/Sample/Common/art.scnassets/gltf/BoxAnimated.glb b/Sample/Common/art.scnassets/gltf/BoxAnimated.glb
new file mode 100644
index 00000000..69481ec3
Binary files /dev/null and b/Sample/Common/art.scnassets/gltf/BoxAnimated.glb differ
diff --git a/Source/Common/GLTFShaderModifierFragment_alphaCutoff.shader b/Source/Common/GLTFShaderModifierFragment_alphaCutoff.shader
index ebf4c94a..bbefc809 100644
--- a/Source/Common/GLTFShaderModifierFragment_alphaCutoff.shader
+++ b/Source/Common/GLTFShaderModifierFragment_alphaCutoff.shader
@@ -12,4 +12,4 @@ float alphaCutOff;
 
 #pragma body
 
-_output.color.a = _output.color.a >= alphaCutoff ? 1.0 : 0.0
+//_output.color.a = _output.color.a >= alphaCutoff ? 1.0 : 0.0
diff --git a/Source/Common/GLTFUnarchiver.swift b/Source/Common/GLTFUnarchiver.swift
index e7545836..4c9a3dfb 100644
--- a/Source/Common/GLTFUnarchiver.swift
+++ b/Source/Common/GLTFUnarchiver.swift
@@ -1293,22 +1293,34 @@ public class GLTFUnarchiver {
         group.animations = animations
         group.repeatCount = .infinity
         
-        let step = animations.count
-        let dataLength = values.count / step
-        guard dataLength == keyTimes.count else {
-            throw GLTFUnarchiveError.DataInconsistent("loadWeightAnimationsSampler: data count mismatch: \(dataLength) != \(keyTimes.count)")
-        }
-        for i in 0..<animations.count {
-            var valueIndex = i
-            var v = [NSNumber]()
-            v.reserveCapacity(dataLength)
-            for _ in 0..<dataLength {
-                v.append(values[valueIndex])
-                valueIndex += step
+        if keyTimes.count == values.count {
+            for i in 0..<animations.count {
+                var v = [NSNumber]()
+                v.reserveCapacity(values.count)
+                for j in 0..<values.count {
+                    v.append(values[j])
+                }
+                animations[i].values = v
+            }
+        } else {
+            let step = animations.count
+            let dataLength = values.count / step
+            // Comment out to fix animations
+            guard dataLength == keyTimes.count else {
+                throw GLTFUnarchiveError.DataInconsistent("loadWeightAnimationsSampler: data count mismatch: \(dataLength) != \(keyTimes.count)")
+            }
+            for i in 0..<animations.count {
+                var valueIndex = i
+                var v = [NSNumber]()
+                v.reserveCapacity(dataLength)
+                for _ in 0..<dataLength {
+                    v.append(values[valueIndex])
+                    valueIndex += step
+                }
+                animations[i].values = v
             }
-            animations[i].values = v
         }
-        
+	
         return group
     }
     
@@ -1343,13 +1355,11 @@ public class GLTFUnarchiver {
         //let animation = CAKeyframeAnimation(keyPath: keyPath)
         // Animation Sampler
         let samplerIndex = glChannel.sampler
-        
-        /*
+
         guard samplerIndex < glAnimation.samplers.count else {
             throw GLTFUnarchiveError.DataInconsistent("loadAnimation: out of index: sampler \(samplerIndex) < \(glAnimation.samplers.count)")
         }
         let glSampler = glAnimation.samplers[samplerIndex]
-        */
         var animation: CAAnimation
         if keyPath == "weights" {
             guard let weightPaths = weightPaths else {