diff --git a/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs b/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs
index 89c6560aa..5ec350bdb 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/RuntimeGltfInstance.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using UnityEngine;
 using VRMShaders;
 
@@ -6,7 +7,7 @@ namespace UniGLTF
 {
     /// <summary>
     /// ImporterContext の Load 結果の GltfModel
-    /// 
+    ///
     /// Runtime でモデルを Destory したときに関連リソース(Texture, Material...などの UnityEngine.Object)を自動的に Destroy する。
     /// </summary>
     public class RuntimeGltfInstance : MonoBehaviour, IResponsibilityForDestroyObjects
@@ -14,25 +15,120 @@ namespace UniGLTF
         /// <summary>
         /// this is UniGLTF root gameObject
         /// </summary>
-        public GameObject Root => this.gameObject;
+        public GameObject Root => (this != null) ? this.gameObject : null;
 
-        List<(SubAssetKey, UnityEngine.Object)> m_resources = new List<(SubAssetKey, UnityEngine.Object)>();
+        /// <summary>
+        /// Transforms with gltf node index.
+        /// </summary>
+        public IReadOnlyList<Transform> Nodes => _nodes;
 
-        public IReadOnlyList<(SubAssetKey, UnityEngine.Object)> RuntimeResources => m_resources;
+        /// <summary>
+        /// Runtime resources.
+        /// ex. Material, Texture, AnimationClip, Mesh.
+        /// </summary>
+        public IReadOnlyList<(SubAssetKey, UnityEngine.Object)> RuntimeResources => _resources;
+
+        /// <summary>
+        /// Materials.
+        /// </summary>
+        public IReadOnlyList<Material> Materials => _materials;
+
+        /// <summary>
+        /// Textures.
+        /// </summary>
+        public IReadOnlyList<Texture> Textures => _textures;
+
+        /// <summary>
+        /// Animation Clips.
+        /// </summary>
+        public IReadOnlyList<AnimationClip> AnimationClips => _animationClips;
+
+        /// <summary>
+        /// Meshes.
+        /// </summary>
+        public IReadOnlyList<Mesh> Meshes => _meshes;
+
+        /// <summary>
+        /// Renderers.
+        /// ex. MeshRenderer, SkinnedMeshRenderer.
+        /// </summary>
+        public IReadOnlyList<Renderer> Renderers => _renderers;
+
+        /// <summary>
+        /// Mesh Renderers.
+        /// </summary>
+        public IReadOnlyList<MeshRenderer> MeshRenderers => _meshRenderers;
+
+        /// <summary>
+        /// Skinned Mesh Renderers.
+        /// </summary>
+        public IReadOnlyList<SkinnedMeshRenderer> SkinnedMeshRenderers => _skinnedMeshRenderers;
+
+        private readonly List<Transform> _nodes = new List<Transform>();
+        private readonly List<(SubAssetKey, UnityEngine.Object)> _resources = new List<(SubAssetKey, UnityEngine.Object)>();
+        private readonly List<Material> _materials = new List<Material>();
+        private readonly List<Texture> _textures = new List<Texture>();
+        private readonly List<AnimationClip> _animationClips = new List<AnimationClip>();
+        private readonly List<Mesh> _meshes = new List<Mesh>();
+        private readonly List<Renderer> _renderers = new List<Renderer>();
+        private readonly List<MeshRenderer> _meshRenderers = new List<MeshRenderer>();
+        private readonly List<SkinnedMeshRenderer> _skinnedMeshRenderers = new List<SkinnedMeshRenderer>();
 
         public static RuntimeGltfInstance AttachTo(GameObject go, ImporterContext context)
         {
             var loaded = go.AddComponent<RuntimeGltfInstance>();
+
+            foreach (var node in context.Nodes)
+            {
+                // Maintain index order.
+                loaded._nodes.Add(node);
+            }
+
             context.TransferOwnership((k, o) =>
             {
-                loaded.m_resources.Add((k, o));
+                if (o == null) return;
+
+                loaded._resources.Add((k, o));
+
+
+                switch (o)
+                {
+                    case Material material:
+                        loaded._materials.Add(material);
+                        break;
+                    case Texture texture:
+                        loaded._textures.Add(texture);
+                        break;
+                    case AnimationClip animationClip:
+                        loaded._animationClips.Add(animationClip);
+                        break;
+                    case Mesh mesh:
+                        loaded._meshes.Add(mesh);
+                        break;
+                }
             });
+
+            foreach (var renderer in go.GetComponentsInChildren<Renderer>())
+            {
+                loaded._renderers.Add(renderer);
+
+                switch (renderer)
+                {
+                    case MeshRenderer meshRenderer:
+                        loaded._meshRenderers.Add(meshRenderer);
+                        break;
+                    case SkinnedMeshRenderer skinnedMeshRenderer:
+                        loaded._skinnedMeshRenderers.Add(skinnedMeshRenderer);
+                        break;
+                }
+            }
+
             return loaded;
         }
 
         public void ShowMeshes()
         {
-            foreach (var r in GetComponentsInChildren<Renderer>())
+            foreach (var r in Renderers)
             {
                 r.enabled = true;
             }
@@ -40,27 +136,27 @@ namespace UniGLTF
 
         public void EnableUpdateWhenOffscreen()
         {
-            foreach (var smr in GetComponentsInChildren<SkinnedMeshRenderer>())
+            foreach (var skinnedMeshRenderer in SkinnedMeshRenderers)
             {
-                smr.updateWhenOffscreen = true;
+                skinnedMeshRenderer.updateWhenOffscreen = true;
             }
         }
 
         void OnDestroy()
         {
             Debug.Log("UnityResourceDestroyer.OnDestroy");
-            foreach (var (key, x) in m_resources)
+            foreach (var (_, obj) in _resources)
             {
-                UnityObjectDestoyer.DestroyRuntimeOrEditor(x);
+                UnityObjectDestoyer.DestroyRuntimeOrEditor(obj);
             }
         }
 
         public void TransferOwnership(TakeResponsibilityForDestroyObjectFunc take)
         {
-            foreach (var (key, x) in m_resources.ToArray())
+            foreach (var (key, x) in _resources.ToArray())
             {
                 take(key, x);
-                m_resources.Remove((key, x));
+                _resources.Remove((key, x));
             }
         }