diff --git a/source/geometry/transformation.js b/source/geometry/transformation.js
index 558aaf4..b6a93c3 100644
--- a/source/geometry/transformation.js
+++ b/source/geometry/transformation.js
@@ -32,10 +32,22 @@ OV.Transformation = class
         return this;
     }
 
+    Append (transformation)
+    {
+        this.AppendMatrix (transformation.GetMatrix ());
+        return this;
+    }
+
     TransformCoord3D (coord)
     {
         let resultVector = this.matrix.MultiplyVector ([coord.x, coord.y, coord.z, 1.0]);
         let result = new OV.Coord3D (resultVector[0], resultVector[1], resultVector[2]);
         return result;
     }
+
+    Clone ()
+    {
+        const clonedMatrix = this.matrix.Clone ();
+        return new OV.Transformation (clonedMatrix);
+    }
 };
diff --git a/test/tests/geometry_test.js b/test/tests/geometry_test.js
index b634605..e11030f 100644
--- a/test/tests/geometry_test.js
+++ b/test/tests/geometry_test.js
@@ -115,6 +115,19 @@ describe ('Transformation', function() {
         assert (OV.CoordIsEqual3D (tr2.TransformCoord3D (coord), new OV.Coord3D (19.0, 13.0, 3.0)));
     });
 
+    it ('Append Test', function () {
+        let coord = new OV.Coord3D (1.0, 2.0, 3.0);
+
+        let tr = new OV.Transformation ();
+        assert (tr.IsIdentity ());
+        assert (OV.CoordIsEqual3D (tr.TransformCoord3D (coord), new OV.Coord3D (1.0, 2.0, 3.0)));
+
+        let tr2 = new OV.Transformation (new OV.Matrix ().CreateScale (3.0, 4.0, 5.0));
+        tr.Append (tr2);
+        assert (!tr.IsIdentity ());
+        assert (OV.CoordIsEqual3D (tr.TransformCoord3D (coord), new OV.Coord3D (3.0, 8.0, 15.0)));
+    });
+
     it ('TRS Compose Test', function () {
         let rotation = CreateYRot90Quaternion ();
         let coord = new OV.Coord3D (1.0, 2.0, 3.0);
@@ -144,7 +157,14 @@ describe ('Transformation', function() {
         let tr = new OV.Transformation ();
         tr.SetMatrix (new OV.Matrix ().CreateRotation (0.0, 0.0, 0.0, 1.0));
         assert (OV.CoordIsEqual3D (tr.TransformCoord3D (coord), coord));
-    });        
+    });
+    
+    it ('Clone Test', function () {
+        let tr = new OV.Transformation ();
+        let cloned = tr.Clone ();
+        tr.matrix.matrix[0] = 5.0;
+        assert.strictEqual (cloned.matrix.matrix[0], 1.0);
+    });
 });
 
 describe ('Tween', function() {
diff --git a/test/tests/model_test.js b/test/tests/model_test.js
index 5ec468c..5c9bb78 100644
--- a/test/tests/model_test.js
+++ b/test/tests/model_test.js
@@ -200,7 +200,7 @@ describe ('Color Conversion', function () {
     });
 });
 
-function CreateHierarchicModel ()
+function CreateHierarchicalModel ()
 {
     /*
         + <Root>
@@ -208,6 +208,7 @@ function CreateHierarchicModel ()
                 + Node 3
                     Mesh 5
                     Mesh 6
+                    Mesh 7
                 + Node 4
                     Mesh 7
                 Mesh 3
@@ -272,6 +273,7 @@ function CreateHierarchicModel ()
     node1.AddMeshIndex (mesh4Ind);
     node3.AddMeshIndex (mesh5Ind);
     node3.AddMeshIndex (mesh6Ind);
+    node3.AddMeshIndex (mesh7Ind);
     node4.AddMeshIndex (mesh7Ind);
 
     return model;
@@ -302,7 +304,7 @@ function GetModelTree (model)
 
 describe ('Node Hierarchy', function () {
     it ('Enumerate hierarchy', function () {
-        let model = CreateHierarchicModel ();
+        let model = CreateHierarchicalModel ();
         let modelTree = GetModelTree (model);
         assert.deepStrictEqual (modelTree, {
             name : '<Root>',
@@ -313,7 +315,7 @@ describe ('Node Hierarchy', function () {
                         {
                             name : 'Node 3',
                             childNodes : [],
-                            meshNames : ['Mesh 5', 'Mesh 6']
+                            meshNames : ['Mesh 5', 'Mesh 6', 'Mesh 7']
                         },
                         {
                             name : 'Node 4',
@@ -334,7 +336,7 @@ describe ('Node Hierarchy', function () {
     });
 
     it ('Remove mesh', function () {
-        let model = CreateHierarchicModel ();
+        let model = CreateHierarchicalModel ();
         model.RemoveMesh (2);
         let modelTree = GetModelTree (model);
         assert.deepStrictEqual (modelTree, {
@@ -346,7 +348,7 @@ describe ('Node Hierarchy', function () {
                         {
                             name : 'Node 3',
                             childNodes : [],
-                            meshNames : ['Mesh 5', 'Mesh 6']
+                            meshNames : ['Mesh 5', 'Mesh 6', 'Mesh 7']
                         },
                         {
                             name : 'Node 4',
@@ -367,7 +369,7 @@ describe ('Node Hierarchy', function () {
     });
 
     it ('Add mesh to index', function () {
-        let model = CreateHierarchicModel ();
+        let model = CreateHierarchicalModel ();
         let mesh = new OV.Mesh ();
         mesh.SetName ('Mesh 8');
         model.AddMeshToIndex (mesh, 3);
@@ -381,7 +383,7 @@ describe ('Node Hierarchy', function () {
                         {
                             name : 'Node 3',
                             childNodes : [],
-                            meshNames : ['Mesh 5', 'Mesh 6']
+                            meshNames : ['Mesh 5', 'Mesh 6', 'Mesh 7']
                         },
                         {
                             name : 'Node 4',
@@ -399,5 +401,5 @@ describe ('Node Hierarchy', function () {
             ],
             meshNames : ['Mesh 1', 'Mesh 2']
         });
-    });
+    });  
 });