diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFMaterial.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFMaterial.cs
index f91dd9d41..4fe760250 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFMaterial.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFMaterial.cs
@@ -8,6 +8,7 @@ namespace UniGLTF
         OcclusionMetallicRoughness,
         Normal,
         SRGB,
+        Linear,
     }
 
     public interface IglTFTextureinfo
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GetTextureParam.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GetTextureParam.cs
index eb4e5264a..8bfcc14a3 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GetTextureParam.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GetTextureParam.cs
@@ -20,6 +20,7 @@ namespace UniGLTF
             NormalMap,
             // Occlusion + Metallic + Smoothness
             StandardMap,
+            Linear,
         }
 
         public static string RemoveSuffix(string src)
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureExporter.cs
new file mode 100644
index 000000000..66c7664ab
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureExporter.cs
@@ -0,0 +1,94 @@
+using UnityEngine;
+
+namespace UniGLTF
+{
+    public static class GltfTextureExporter
+    {
+
+        /// <summary>
+        /// 画像のバイト列を得る
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <param name="texture"></param>
+        /// <returns></returns>
+        static (byte[] bytes, string mine) GetBytesWithMime(Texture2D texture)
+        {
+#if UNITY_EDITOR
+            var path = UnityPath.FromAsset(texture);
+            if (path.IsUnderAssetsFolder)
+            {
+                if (path.Extension == ".png")
+                {
+                    return
+                    (
+                        System.IO.File.ReadAllBytes(path.FullPath),
+                        "image/png"
+                    );
+                }
+                if (path.Extension == ".jpg")
+                {
+                    return
+                    (
+                        System.IO.File.ReadAllBytes(path.FullPath),
+                        "image/jpeg"
+                    );
+                }
+            }
+#endif
+
+            return
+            (
+                texture.EncodeToPNG(),
+                "image/png"
+            );
+        }
+
+        /// <summary>
+        /// gltf に texture を足す
+        /// 
+        /// * textures
+        /// * samplers
+        /// * images
+        /// * bufferViews
+        /// 
+        /// を更新し、textures の index を返す
+        /// 
+        /// </summary>
+        /// <param name="gltf"></param>
+        /// <param name="bufferIndex"></param>
+        /// <param name="texture"></param>
+        /// <returns>gltf texture index</returns>
+        public static int PushGltfTexture(this glTF gltf, int bufferIndex, Texture2D texture)
+        {
+            var bytesWithMime = GetBytesWithMime(texture);
+
+            // add view
+            var view = gltf.buffers[bufferIndex].Append(bytesWithMime.bytes, glBufferTarget.NONE);
+            var viewIndex = gltf.AddBufferView(view);
+
+            // add image
+            var imageIndex = gltf.images.Count;
+            gltf.images.Add(new glTFImage
+            {
+                name = GetTextureParam.RemoveSuffix(texture.name),
+                bufferView = viewIndex,
+                mimeType = bytesWithMime.mine,
+            });
+
+            // add sampler
+            var samplerIndex = gltf.samplers.Count;
+            var sampler = TextureSamplerUtil.Export(texture);
+            gltf.samplers.Add(sampler);
+
+            // add texture
+            var textureIndex = gltf.textures.Count;
+            gltf.textures.Add(new glTFTexture
+            {
+                sampler = samplerIndex,
+                source = imageIndex,
+            });
+
+            return textureIndex;
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureExporter.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureExporter.cs.meta
new file mode 100644
index 000000000..df9f76019
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/GltfTextureExporter.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: edc800243b783ea4392e1d916789c803
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/TextureExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/TextureExporter.cs
index 486bdece0..4cf0c3f5e 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/TextureExporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TextureIO/TextureExporter.cs
@@ -100,7 +100,7 @@ namespace UniGLTF
         }
 
         /// <summary>
-        /// sRGBなテクスチャーを処理する
+        /// sRGBなテクスチャーを処理し、index を確定させる
         /// </summary>
         /// <param name="src"></param>
         /// <returns></returns>
@@ -135,7 +135,17 @@ namespace UniGLTF
         }
 
         /// <summary>
-        /// Standard の Metallic, Smoothness, Occlusion をまとめる
+        /// Linearなテクスチャーを処理し、index を確定させる
+        /// </summary>
+        /// <param name="src"></param>
+        /// <returns></returns>
+        public int ExportLinear(Texture src)
+        {
+            throw new NotImplementedException();
+        }
+
+        /// <summary>
+        /// Standard の Metallic, Smoothness, Occlusion をまとめ、index を確定させる
         /// </summary>
         /// <param name="metallicSmoothTexture"></param>
         /// <param name="smoothness"></param>
@@ -175,7 +185,7 @@ namespace UniGLTF
         }
 
         /// <summary>
-        /// Normal のテクスチャを変換する
+        /// Normal のテクスチャを変換し index を確定させる
         /// </summary>
         /// <param name="normalTexture"></param>
         /// <returns></returns>
@@ -210,83 +220,5 @@ namespace UniGLTF
 
             return index;
         }
-
-        /// <summary>
-        /// 画像のバイト列を得る
-        /// </summary>
-        /// <param name="bytes"></param>
-        /// <param name="texture"></param>
-        /// <returns></returns>
-        static (Byte[] bytes, string mine) GetBytesWithMime(Texture2D texture)
-        {
-#if UNITY_EDITOR
-            var path = UnityPath.FromAsset(texture);
-            if (path.IsUnderAssetsFolder)
-            {
-                if (path.Extension == ".png")
-                {
-                    return
-                    (
-                        System.IO.File.ReadAllBytes(path.FullPath),
-                        "image/png"
-                    );
-                }
-                if (path.Extension == ".jpg")
-                {
-                    return
-                    (
-                        System.IO.File.ReadAllBytes(path.FullPath),
-                        "image/jpeg"
-                    );
-                }
-            }
-#endif
-
-            return
-            (
-                texture.EncodeToPNG(),
-                "image/png"
-            );
-        }
-
-        /// <summary>
-        /// 
-        /// </summary>
-        /// <param name="gltf"></param>
-        /// <param name="bufferIndex"></param>
-        /// <param name="texture"></param>
-        /// <returns></returns>
-        static public int ExportTexture(glTF gltf, int bufferIndex, Texture2D texture)
-        {
-            var bytesWithMime = GetBytesWithMime(texture);
-
-            // add view
-            var view = gltf.buffers[bufferIndex].Append(bytesWithMime.bytes, glBufferTarget.NONE);
-            var viewIndex = gltf.AddBufferView(view);
-
-            // add image
-            var imageIndex = gltf.images.Count;
-            gltf.images.Add(new glTFImage
-            {
-                name = GetTextureParam.RemoveSuffix(texture.name),
-                bufferView = viewIndex,
-                mimeType = bytesWithMime.mine,
-            });
-
-            // add sampler
-            var samplerIndex = gltf.samplers.Count;
-            var sampler = TextureSamplerUtil.Export(texture);
-            gltf.samplers.Add(sampler);
-
-            // add texture
-            var textureIndex = gltf.textures.Count;
-            gltf.textures.Add(new glTFTexture
-            {
-                sampler = samplerIndex,
-                source = imageIndex,
-            });
-
-            return textureIndex;
-        }
     }
 }
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/gltfExporter.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/gltfExporter.cs
index 5ac336716..424b02de0 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/gltfExporter.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/gltfExporter.cs
@@ -188,7 +188,7 @@ namespace UniGLTF
             for (int i = 0; i < TextureManager.Exported.Count; ++i)
             {
                 var unityTexture = TextureManager.Exported[i];
-                TextureExporter.ExportTexture(glTF, bufferIndex, unityTexture);
+                glTF.PushGltfTexture(bufferIndex, unityTexture);
             }
             #endregion
 
diff --git a/Assets/VRM/Runtime/IO/VRMExporter.cs b/Assets/VRM/Runtime/IO/VRMExporter.cs
index a24c3e240..1245c9196 100644
--- a/Assets/VRM/Runtime/IO/VRMExporter.cs
+++ b/Assets/VRM/Runtime/IO/VRMExporter.cs
@@ -112,7 +112,7 @@ namespace VRM
                     VRM.meta.title = meta.Title;
                     if (meta.Thumbnail != null)
                     {
-                        VRM.meta.texture = TextureExporter.ExportTexture(glTF, glTF.buffers.Count - 1, meta.Thumbnail);
+                        VRM.meta.texture = glTF.PushGltfTexture(glTF.buffers.Count - 1, meta.Thumbnail);
                     }
 
                     VRM.meta.licenseType = meta.LicenseType;