diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/Bvh.cs b/Assets/UniGLTF/Runtime/UniHumanoid/Format/Bvh.cs
index 0310dc6ac..01712b3b5 100644
--- a/Assets/UniGLTF/Runtime/UniHumanoid/Format/Bvh.cs
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/Bvh.cs
@@ -6,190 +6,6 @@ using System.Linq;
 
 namespace UniHumanoid
 {
-    public class BvhException : Exception
-    {
-        public BvhException(string msg) : base(msg) { }
-    }
-
-    public enum Channel
-    {
-        Xposition,
-        Yposition,
-        Zposition,
-        Xrotation,
-        Yrotation,
-        Zrotation,
-    }
-    public static class ChannelExtensions
-    {
-        public static string ToProperty(this Channel ch)
-        {
-            switch (ch)
-            {
-                case Channel.Xposition: return "localPosition.x";
-                case Channel.Yposition: return "localPosition.y";
-                case Channel.Zposition: return "localPosition.z";
-                case Channel.Xrotation: return "localEulerAnglesBaked.x";
-                case Channel.Yrotation: return "localEulerAnglesBaked.y";
-                case Channel.Zrotation: return "localEulerAnglesBaked.z";
-            }
-
-            throw new BvhException("no property for " + ch);
-        }
-
-        public static bool IsLocation(this Channel ch)
-        {
-            switch (ch)
-            {
-                case Channel.Xposition:
-                case Channel.Yposition:
-                case Channel.Zposition: return true;
-                case Channel.Xrotation:
-                case Channel.Yrotation:
-                case Channel.Zrotation: return false;
-            }
-
-            throw new BvhException("no property for " + ch);
-        }
-    }
-
-    public struct Single3
-    {
-        public Single x;
-        public Single y;
-        public Single z;
-
-        public Single3(Single _x, Single _y, Single _z)
-        {
-            x = _x;
-            y = _y;
-            z = _z;
-        }
-    }
-
-    public class BvhNode
-    {
-        public String Name
-        {
-            get;
-            private set;
-        }
-
-        public Single3 Offset
-        {
-            get;
-            private set;
-        }
-
-        public Channel[] Channels
-        {
-            get;
-            private set;
-        }
-
-        public List<BvhNode> Children
-        {
-            get;
-            private set;
-        }
-
-        public BvhNode(string name)
-        {
-            Name = name;
-            Children = new List<BvhNode>();
-        }
-
-        public int GetChannelIndex(Channel channel)
-        {
-            for (int i = 0; i < Channels.Length; ++i)
-            {
-                if (channel == Channels[i])
-                {
-                    return i;
-                }
-            }
-            throw new KeyNotFoundException();
-        }
-
-        public virtual void Parse(StringReader r)
-        {
-            Offset = ParseOffset(r.ReadLine());
-
-            Channels = ParseChannel(r.ReadLine());
-        }
-
-        static Single3 ParseOffset(string line)
-        {
-            var split = line.Trim().Split();
-            if (split[0] != "OFFSET")
-            {
-                throw new BvhException("OFFSET is not found");
-            }
-
-            var offset = split.Skip(1).Where(x => !string.IsNullOrEmpty(x)).Select(x => float.Parse(x, System.Globalization.CultureInfo.InvariantCulture)).ToArray();
-            return new Single3(offset[0], offset[1], offset[2]);
-        }
-
-        static Channel[] ParseChannel(string line)
-        {
-            var split = line.Trim().Split();
-            if (split[0] != "CHANNELS")
-            {
-                throw new BvhException("CHANNELS is not found");
-            }
-            var count = int.Parse(split[1]);
-            if (count + 2 != split.Length)
-            {
-                throw new BvhException("channel count is not match with split count");
-            }
-            return split.Skip(2).Select(x => (Channel)Enum.Parse(typeof(Channel), x)).ToArray();
-        }
-
-        public IEnumerable<BvhNode> Traverse()
-        {
-            yield return this;
-
-            foreach (var child in Children)
-            {
-                foreach (var descendant in child.Traverse())
-                {
-                    yield return descendant;
-                }
-            }
-        }
-    }
-
-    public class EndSite : BvhNode
-    {
-        public EndSite() : base("")
-        {
-        }
-
-        public override void Parse(StringReader r)
-        {
-            r.ReadLine(); // offset
-        }
-    }
-
-    public class ChannelCurve
-    {
-        public float[] Keys
-        {
-            get;
-            private set;
-        }
-
-        public ChannelCurve(int frameCount)
-        {
-            Keys = new float[frameCount];
-        }
-
-        public void SetKey(int frame, float value)
-        {
-            Keys[frame] = value;
-        }
-    }
-
     public class Bvh
     {
         public BvhNode Root
@@ -204,7 +20,7 @@ namespace UniHumanoid
             private set;
         }
 
-        public ChannelCurve[] Channels
+        public BvhChannelCurve[] Channels
         {
             get;
             private set;
@@ -223,7 +39,7 @@ namespace UniHumanoid
             public bool IsLocation;
         }
 
-        public bool TryGetPathWithPropertyFromChannel(ChannelCurve channel, out PathWithProperty pathWithProp)
+        public bool TryGetPathWithPropertyFromChannel(BvhChannelCurve channel, out PathWithProperty pathWithProp)
         {
             var index = Channels.ToList().IndexOf(channel);
             if (index == -1)
@@ -282,7 +98,7 @@ namespace UniHumanoid
             return null;
         }
 
-        public ChannelCurve GetChannel(BvhNode target, Channel channel)
+        public BvhChannelCurve GetChannel(BvhNode target, BvhChannel channel)
         {
             var index = 0;
             foreach (var node in Root.Traverse())
@@ -318,7 +134,7 @@ namespace UniHumanoid
                 .Select(x => x.Channels.Length)
                 .Sum();
             Channels = Enumerable.Range(0, channelCount)
-                .Select(x => new ChannelCurve(frames))
+                .Select(x => new BvhChannelCurve(frames))
                 .ToArray()
                 ;
         }
@@ -422,7 +238,7 @@ namespace UniHumanoid
                 {
                     throw new BvhException("End in level 0");
                 }
-                node = new EndSite();
+                node = new BvhEndSite();
             }
             else
             {
@@ -445,7 +261,7 @@ namespace UniHumanoid
                     break;
                 }
 
-                if (!(child is EndSite))
+                if (!(child is BvhEndSite))
                 {
                     node.Children.Add(child);
                 }
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannel.cs b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannel.cs
new file mode 100644
index 000000000..3c28916f6
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannel.cs
@@ -0,0 +1,45 @@
+namespace UniHumanoid
+{
+    public enum BvhChannel
+    {
+        Xposition,
+        Yposition,
+        Zposition,
+        Xrotation,
+        Yrotation,
+        Zrotation,
+    }
+
+    public static class BvhChannelExtensions
+    {
+        public static string ToProperty(this BvhChannel ch)
+        {
+            switch (ch)
+            {
+                case BvhChannel.Xposition: return "localPosition.x";
+                case BvhChannel.Yposition: return "localPosition.y";
+                case BvhChannel.Zposition: return "localPosition.z";
+                case BvhChannel.Xrotation: return "localEulerAnglesBaked.x";
+                case BvhChannel.Yrotation: return "localEulerAnglesBaked.y";
+                case BvhChannel.Zrotation: return "localEulerAnglesBaked.z";
+            }
+
+            throw new BvhException("no property for " + ch);
+        }
+
+        public static bool IsLocation(this BvhChannel ch)
+        {
+            switch (ch)
+            {
+                case BvhChannel.Xposition:
+                case BvhChannel.Yposition:
+                case BvhChannel.Zposition: return true;
+                case BvhChannel.Xrotation:
+                case BvhChannel.Yrotation:
+                case BvhChannel.Zrotation: return false;
+            }
+
+            throw new BvhException("no property for " + ch);
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannel.cs.meta b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannel.cs.meta
new file mode 100644
index 000000000..c977786a4
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannel.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 885c621c7dd0faf4e8e3de2e0187d2ac
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannelCurve.cs b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannelCurve.cs
new file mode 100644
index 000000000..dc0dd8814
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannelCurve.cs
@@ -0,0 +1,21 @@
+namespace UniHumanoid
+{
+    public class BvhChannelCurve
+    {
+        public float[] Keys
+        {
+            get;
+            private set;
+        }
+
+        public BvhChannelCurve(int frameCount)
+        {
+            Keys = new float[frameCount];
+        }
+
+        public void SetKey(int frame, float value)
+        {
+            Keys[frame] = value;
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannelCurve.cs.meta b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannelCurve.cs.meta
new file mode 100644
index 000000000..c42c4951b
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhChannelCurve.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 588638a01ee0b7c47bd731aeed170cea
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhEndSite.cs b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhEndSite.cs
new file mode 100644
index 000000000..63e8ca191
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhEndSite.cs
@@ -0,0 +1,16 @@
+using System.IO;
+
+namespace UniHumanoid
+{
+    public class BvhEndSite : BvhNode
+    {
+        public BvhEndSite() : base("")
+        {
+        }
+
+        public override void Parse(StringReader r)
+        {
+            r.ReadLine(); // offset
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhEndSite.cs.meta b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhEndSite.cs.meta
new file mode 100644
index 000000000..7f31574ba
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhEndSite.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: bc2103bbe9c95224e9458e1fb058140f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhException.cs b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhException.cs
new file mode 100644
index 000000000..8e1fa95da
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhException.cs
@@ -0,0 +1,9 @@
+using System;
+
+namespace UniHumanoid
+{
+    public class BvhException : Exception
+    {
+        public BvhException(string msg) : base(msg) { }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhException.cs.meta b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhException.cs.meta
new file mode 100644
index 000000000..2e9e07579
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhException.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 86267a6edfc8fc749948c586e622846f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhNode.cs b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhNode.cs
new file mode 100644
index 000000000..0421fe09f
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhNode.cs
@@ -0,0 +1,100 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using UnityEngine;
+
+namespace UniHumanoid
+{
+    public class BvhNode
+    {
+        public String Name
+        {
+            get;
+            private set;
+        }
+
+        public Vector3 Offset
+        {
+            get;
+            private set;
+        }
+
+        public BvhChannel[] Channels
+        {
+            get;
+            private set;
+        }
+
+        public List<BvhNode> Children
+        {
+            get;
+            private set;
+        }
+
+        public BvhNode(string name)
+        {
+            Name = name;
+            Children = new List<BvhNode>();
+        }
+
+        public int GetChannelIndex(BvhChannel channel)
+        {
+            for (int i = 0; i < Channels.Length; ++i)
+            {
+                if (channel == Channels[i])
+                {
+                    return i;
+                }
+            }
+            throw new KeyNotFoundException();
+        }
+
+        public virtual void Parse(StringReader r)
+        {
+            Offset = ParseOffset(r.ReadLine());
+
+            Channels = ParseChannel(r.ReadLine());
+        }
+
+        private static Vector3 ParseOffset(string line)
+        {
+            string[] split = line.Trim().Split();
+            if (split[0] != "OFFSET")
+            {
+                throw new BvhException("OFFSET is not found");
+            }
+
+            var offset = split.Skip(1).Where(x => !string.IsNullOrEmpty(x)).Select(x => float.Parse(x, System.Globalization.CultureInfo.InvariantCulture)).ToArray();
+            return new Vector3(offset[0], offset[1], offset[2]);
+        }
+
+        private static BvhChannel[] ParseChannel(string line)
+        {
+            var split = line.Trim().Split();
+            if (split[0] != "CHANNELS")
+            {
+                throw new BvhException("CHANNELS is not found");
+            }
+            var count = int.Parse(split[1]);
+            if (count + 2 != split.Length)
+            {
+                throw new BvhException("channel count is not match with split count");
+            }
+            return split.Skip(2).Select(x => (BvhChannel)Enum.Parse(typeof(BvhChannel), x)).ToArray();
+        }
+
+        public IEnumerable<BvhNode> Traverse()
+        {
+            yield return this;
+
+            foreach (var child in Children)
+            {
+                foreach (var descendant in child.Traverse())
+                {
+                    yield return descendant;
+                }
+            }
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhNode.cs.meta b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhNode.cs.meta
new file mode 100644
index 000000000..14b8c7f27
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/Format/BvhNode.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7f4ac3efd1faca94381a344a5be51cc2
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhAnimationClip.cs b/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhAnimationClip.cs
index ea644f5c9..64036ab57 100644
--- a/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhAnimationClip.cs
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhAnimationClip.cs
@@ -16,9 +16,9 @@ namespace UniHumanoid
                 Node = node;
             }
 
-            public ChannelCurve PositionX;
-            public ChannelCurve PositionY;
-            public ChannelCurve PositionZ;
+            public BvhChannelCurve PositionX;
+            public BvhChannelCurve PositionY;
+            public BvhChannelCurve PositionZ;
             public Vector3 GetPosition(int i)
             {
                 return new Vector3(
@@ -27,9 +27,9 @@ namespace UniHumanoid
                     PositionZ.Keys[i]);
             }
 
-            public ChannelCurve RotationX;
-            public ChannelCurve RotationY;
-            public ChannelCurve RotationZ;
+            public BvhChannelCurve RotationX;
+            public BvhChannelCurve RotationY;
+            public BvhChannelCurve RotationZ;
             public Quaternion GetRotation(int i)
             {
                 if (EulerToRotation == null)
@@ -43,7 +43,7 @@ namespace UniHumanoid
                     );
             }
 
-            static void AddCurve(Bvh bvh, AnimationClip clip, ChannelCurve ch, float scaling)
+            static void AddCurve(Bvh bvh, AnimationClip clip, BvhChannelCurve ch, float scaling)
             {
                 if (ch == null) return;
                 var pathWithProp = default(Bvh.PathWithProperty);
@@ -106,12 +106,12 @@ namespace UniHumanoid
                     var curve = bvh.Channels[j];
                     switch (node.Channels[i])
                     {
-                        case Channel.Xposition: set.PositionX = curve; break;
-                        case Channel.Yposition: set.PositionY = curve; break;
-                        case Channel.Zposition: set.PositionZ = curve; break;
-                        case Channel.Xrotation: set.RotationX = curve; break;
-                        case Channel.Yrotation: set.RotationY = curve; break;
-                        case Channel.Zrotation: set.RotationZ = curve; break;
+                        case BvhChannel.Xposition: set.PositionX = curve; break;
+                        case BvhChannel.Yposition: set.PositionY = curve; break;
+                        case BvhChannel.Zposition: set.PositionZ = curve; break;
+                        case BvhChannel.Xrotation: set.RotationX = curve; break;
+                        case BvhChannel.Yrotation: set.RotationY = curve; break;
+                        case BvhChannel.Zrotation: set.RotationZ = curve; break;
                         default: throw new Exception();
                     }
                 }
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhImporterContext.cs b/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhImporterContext.cs
index 572320560..5bdf53d8b 100644
--- a/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhImporterContext.cs
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/IO/BvhImporterContext.cs
@@ -75,7 +75,7 @@ namespace UniHumanoid
             //
             // scaling. reposition
             //
-            var yCh = Bvh.Root.GetChannelIndex(Channel.Yposition);
+            var yCh = Bvh.Root.GetChannelIndex(BvhChannel.Yposition);
             var curve = Bvh.Channels[yCh];
             var hipHeight = curve.Keys[0];
 
diff --git a/Assets/UniGLTF/Runtime/UniHumanoid/IO/Extensions/BvhExtensions.cs b/Assets/UniGLTF/Runtime/UniHumanoid/IO/Extensions/BvhExtensions.cs
index 2b80293f2..b9d737cd6 100644
--- a/Assets/UniGLTF/Runtime/UniHumanoid/IO/Extensions/BvhExtensions.cs
+++ b/Assets/UniGLTF/Runtime/UniHumanoid/IO/Extensions/BvhExtensions.cs
@@ -9,7 +9,7 @@ namespace UniHumanoid
     {
         public static Func<float, float, float, Quaternion> GetEulerToRotation(this BvhNode bvh)
         {
-            var order = bvh.Channels.Where(x => x == Channel.Xrotation || x == Channel.Yrotation || x == Channel.Zrotation).ToArray();
+            var order = bvh.Channels.Where(x => x == BvhChannel.Xrotation || x == BvhChannel.Yrotation || x == BvhChannel.Zrotation).ToArray();
 
             return (x, y, z) =>
             {
@@ -22,9 +22,9 @@ namespace UniHumanoid
                 {
                     switch (ch)
                     {
-                        case Channel.Xrotation: r = r * xRot; break;
-                        case Channel.Yrotation: r = r * yRot; break;
-                        case Channel.Zrotation: r = r * zRot; break;
+                        case BvhChannel.Xrotation: r = r * xRot; break;
+                        case BvhChannel.Yrotation: r = r * yRot; break;
+                        case BvhChannel.Zrotation: r = r * zRot; break;
                         default: throw new BvhException("no rotation");
                     }
                 }
@@ -32,12 +32,12 @@ namespace UniHumanoid
             };
         }
 
-        public static Vector3 ToVector3(this Single3 s3)
+        public static Vector3 ToVector3(this Vector3 s3)
         {
             return new Vector3(s3.x, s3.y, s3.z);
         }
 
-        public static Vector3 ToXReversedVector3(this Single3 s3)
+        public static Vector3 ToXReversedVector3(this Vector3 s3)
         {
             return new Vector3(-s3.x, s3.y, s3.z);
         }