diff --git a/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs b/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs
index 674801c6d..b5bfc72f6 100644
--- a/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs
+++ b/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs
@@ -1,46 +1,11 @@
 using System;
-using System.Linq;
 using System.Collections.Generic;
-using System.Runtime.InteropServices;
 using UnityEngine;
 using System.IO;
 using UniJSON;
 
 namespace UniGLTF
 {
-    [Serializable, StructLayout(LayoutKind.Sequential, Pack = 1)]
-    public struct Byte4
-    {
-        public readonly byte x;
-        public readonly byte y;
-        public readonly byte z;
-        public readonly byte w;
-        public Byte4(byte _x, byte _y, byte _z, byte _w)
-        {
-            x = _x;
-            y = _y;
-            z = _z;
-            w = _w;
-        }
-    }
-
-    [Serializable, StructLayout(LayoutKind.Sequential, Pack = 1)]
-    public struct UShort4
-    {
-        public readonly ushort x;
-        public readonly ushort y;
-        public readonly ushort z;
-        public readonly ushort w;
-
-        public UShort4(ushort _x, ushort _y, ushort _z, ushort _w)
-        {
-            x = _x;
-            y = _y;
-            z = _z;
-            w = _w;
-        }
-    }
-
     public static class glTFExtensions
     {
         struct ComponentVec
@@ -239,14 +204,6 @@ namespace UniGLTF
             return index;
         }
 
-
-
-
-
-
-
-
-
         static Utf8String s_extensions = Utf8String.From("extensions");
 
         static bool UsedExtension(this glTF self, string key)
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/Byte4.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/Byte4.cs
new file mode 100644
index 000000000..7df1446b6
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/Byte4.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace UniGLTF
+{
+    [Serializable, StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct Byte4
+    {
+        public readonly byte x;
+        public readonly byte y;
+        public readonly byte z;
+        public readonly byte w;
+        public Byte4(byte _x, byte _y, byte _z, byte _w)
+        {
+            x = _x;
+            y = _y;
+            z = _z;
+            w = _w;
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/Byte4.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/IO/Byte4.cs.meta
new file mode 100644
index 000000000..fcbebceec
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/Byte4.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7d396586954b6d34a84d9af8638e492e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/UShort4.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/UShort4.cs
new file mode 100644
index 000000000..d13c87c93
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/UShort4.cs
@@ -0,0 +1,22 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace UniGLTF
+{
+    [Serializable, StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct UShort4
+    {
+        public readonly ushort x;
+        public readonly ushort y;
+        public readonly ushort z;
+        public readonly ushort w;
+
+        public UShort4(ushort _x, ushort _y, ushort _z, ushort _w)
+        {
+            x = _x;
+            y = _y;
+            z = _z;
+            w = _w;
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/UShort4.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/IO/UShort4.cs.meta
new file mode 100644
index 000000000..9c925e07b
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/UShort4.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b1f199669bb47f747865a96bcd7bcbfb
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: