diff --git a/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs b/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs
index 02edf3e123..05b5582ce7 100644
--- a/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs
+++ b/Assets/UniGLTF/Runtime/Extensions/glTFExtensions.cs
@@ -316,17 +316,26 @@ public static T[] GetArrayFromAccessor<T>(this glTF self, int accessorIndex) whe
             return result;
         }
 
-        public static float[] GetFloatArrayFromAccessor(this glTF self, int accessorIndex)
+        public static float[] FlatternFloatArrayFromAccessor(this glTF self, int accessorIndex)
         {
             var vertexAccessor = self.accessors[accessorIndex];
 
             if (vertexAccessor.count <= 0) return new float[] { };
 
             var bufferCount = vertexAccessor.count * vertexAccessor.TypeCount;
-            var result = (vertexAccessor.bufferView != -1)
-                    ? self.GetAttrib<float>(bufferCount, vertexAccessor.byteOffset, self.bufferViews[vertexAccessor.bufferView])
-                    : new float[bufferCount]
-                ;
+
+            float[] result = null;
+            if(vertexAccessor.bufferView != -1){
+                var attrib = new float[vertexAccessor.count * vertexAccessor.TypeCount];
+                var view = self.bufferViews[vertexAccessor.bufferView];
+                var segment = self.buffers[view.buffer].GetBytes();
+                var bytes = new ArraySegment<Byte>(segment.Array, segment.Offset + view.byteOffset + vertexAccessor.byteOffset, vertexAccessor.count * view.byteStride);
+                bytes.MarshalCopyTo(attrib);
+                result = attrib;
+            }
+            else{
+                result =  new float[bufferCount];
+            }
 
             var sparse = vertexAccessor.sparse;
             if (sparse != null && sparse.count > 0)
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/AnimationImporterUtil.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/AnimationImporterUtil.cs
index 9cd5fd680d..b300827ab9 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/AnimationImporterUtil.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/AnimationImporterUtil.cs
@@ -202,7 +202,7 @@ public static AnimationClip ConvertAnimationClip(glTF gltf, glTFAnimation animat
                         {
                             var sampler = animation.samplers[channel.sampler];
                             var input = gltf.GetArrayFromAccessor<float>(sampler.input);
-                            var output = gltf.GetFloatArrayFromAccessor(sampler.output);
+                            var output = gltf.FlatternFloatArrayFromAccessor(sampler.output);
 
                             AnimationImporterUtil.SetAnimationCurve(
                                 clip,
@@ -225,7 +225,7 @@ public static AnimationClip ConvertAnimationClip(glTF gltf, glTFAnimation animat
                         {
                             var sampler = animation.samplers[channel.sampler];
                             var input = gltf.GetArrayFromAccessor<float>(sampler.input);
-                            var output = gltf.GetFloatArrayFromAccessor(sampler.output);
+                            var output = gltf.FlatternFloatArrayFromAccessor(sampler.output);
 
                             AnimationImporterUtil.SetAnimationCurve(
                                 clip,
@@ -251,7 +251,7 @@ public static AnimationClip ConvertAnimationClip(glTF gltf, glTFAnimation animat
                         {
                             var sampler = animation.samplers[channel.sampler];
                             var input = gltf.GetArrayFromAccessor<float>(sampler.input);
-                            var output = gltf.GetFloatArrayFromAccessor(sampler.output);
+                            var output = gltf.FlatternFloatArrayFromAccessor(sampler.output);
 
                             AnimationImporterUtil.SetAnimationCurve(
                                 clip,
diff --git a/Assets/VRM.Samples/Scripts/ViewerUI.cs b/Assets/VRM.Samples/Scripts/ViewerUI.cs
index bb640dbe49..6de3d72ca2 100644
--- a/Assets/VRM.Samples/Scripts/ViewerUI.cs
+++ b/Assets/VRM.Samples/Scripts/ViewerUI.cs
@@ -264,7 +264,7 @@ void EnableTPose()
         void OnOpenClicked()
         {
 #if UNITY_STANDALONE_WIN
-            var path = FileDialogForWindows.FileDialog("open VRM", "vrm", "glb", "bvh");
+            var path = FileDialogForWindows.FileDialog("open VRM", "vrm", "glb", "bvh", "gltf", "zip");
 #elif UNITY_EDITOR
             var path = UnityEditor.EditorUtility.OpenFilePanel("Open VRM", "", "vrm");
 #else
@@ -281,6 +281,7 @@ void OnOpenClicked()
                 case ".gltf":
                 case ".glb":
                 case ".vrm":
+                case ".zip":
                     LoadModel(path);
                     break;
 
@@ -328,6 +329,19 @@ void LoadModel(string path)
                         break;
                     }
 
+                case ".gltf":
+                case ".zip":
+                    {
+                        var context = new UniGLTF.ImporterContext();
+                        context.Parse(path);
+                        context.Load();
+                        context.ShowMeshes();
+                        context.EnableUpdateWhenOffscreen();
+                        context.ShowMeshes();
+                        SetModel(context.Root);
+                        break;
+                    }
+
                 default:
                     Debug.LogWarningFormat("unknown file type: {0}", path);
                     break;