diff --git a/PCK-Studio/Extensions/OpenTkMatrixExtensions.cs b/PCK-Studio/Extensions/OpenTkMatrixExtensions.cs
new file mode 100644
index 00000000..312cce34
--- /dev/null
+++ b/PCK-Studio/Extensions/OpenTkMatrixExtensions.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using OpenTK;
+
+namespace PckStudio.Extensions
+{
+    internal static class OpenTkMatrixExtensions
+    {
+        internal static Matrix4 Pivoted(this Matrix4 target, Vector3 translation, Vector3 pivot)
+        {
+            var model = Matrix4.CreateTranslation(translation);
+            model *= Matrix4.CreateTranslation(pivot);
+            model *= target;
+            model *= Matrix4.CreateTranslation(pivot).Inverted();
+            return model;
+        }
+    }
+}
diff --git a/PCK-Studio/PckStudio.csproj b/PCK-Studio/PckStudio.csproj
index 48bbb803..58cb2466 100644
--- a/PCK-Studio/PckStudio.csproj
+++ b/PCK-Studio/PckStudio.csproj
@@ -134,6 +134,7 @@
     <Reference Include="WindowsFormsIntegration" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Extensions\OpenTkMatrixExtensions.cs" />
     <Compile Include="Internal\IO\PSM\PSMFileReader.cs" />
     <Compile Include="Internal\IO\PSM\PSMFileWriter.cs" />
     <Compile Include="Internal\IO\TGA\TGADeserializer.cs" />
diff --git a/PCK-Studio/Rendering/CubeGroupMesh.cs b/PCK-Studio/Rendering/CubeGroupMesh.cs
index 10f76c49..b14948b6 100644
--- a/PCK-Studio/Rendering/CubeGroupMesh.cs
+++ b/PCK-Studio/Rendering/CubeGroupMesh.cs
@@ -136,12 +136,12 @@ namespace PckStudio.Rendering
             }
         }
 
-        private Matrix4 Transform
+        internal Matrix4 Transform
         {
-            get => Matrix4.CreateTranslation(Translation) * Matrix4.CreateTranslation(Pivot * 2);
+            get => Matrix4.Identity.Pivoted(Translation - Offset, Pivot + Offset);
         }
 
-        internal Vector3 GetWorldPosition(Vector3 localPosition) => Vector3.TransformPosition(localPosition, Transform);
+        internal Vector3 GetWorldPosition(Vector3 localPosition) => (Matrix4.CreateTranslation(localPosition) * Transform).Inverted().ExtractTranslation();
 
         internal Vector3 GetCenter(int index)
         {
@@ -157,14 +157,15 @@ namespace PckStudio.Rendering
                 throw new IndexOutOfRangeException();
 
             CubeMesh cube = cubes[index];
-            return cube.GetBoundingBox(Transform);
+            var bb = cube.GetBoundingBox();
+            return new BoundingBox(GetWorldPosition(bb.Start.ToOpenTKVector() * new Vector3(1, -1, -1)).ToNumericsVector(), GetWorldPosition(bb.End.ToOpenTKVector() * new Vector3(1, -1, -1)).ToNumericsVector());
         }
 
         internal Vector3 GetFaceCenter(int index, Cube.Face face)
         {
             if (!cubes.IndexInRange(index))
                 throw new IndexOutOfRangeException();
-            return GetWorldPosition(cubes[index].GetFaceCenter(face));
+            return GetWorldPosition(cubes[index].GetFaceCenter(face) * new Vector3(1,-1,-1));
         }
 
         internal void SetEnabled(int index, bool enable)
diff --git a/PCK-Studio/Rendering/SkinRenderer.cs b/PCK-Studio/Rendering/SkinRenderer.cs
index e48de7f8..42a44c9f 100644
--- a/PCK-Studio/Rendering/SkinRenderer.cs
+++ b/PCK-Studio/Rendering/SkinRenderer.cs
@@ -1040,7 +1040,8 @@ namespace PckStudio.Rendering
                 {
                     if (ANIM.GetFlag(SkinAnimFlag.DINNERBONE))
                     {
-                        transform = Pivot(head.GetFaceCenter(0, Cube.Face.Top), Vector3.UnitY * 12f, transform * Matrix4.CreateRotationZ(MathHelper.DegreesToRadians(-180f)));
+                        transform *= Matrix4.CreateRotationZ(MathHelper.DegreesToRadians(-180f));
+                        transform = transform.Pivoted(head.GetFaceCenter(0, Cube.Face.Top), Vector3.UnitY * 12f);
                     }
 
                     if (!ANIM.GetFlag(SkinAnimFlag.STATIC_ARMS))
@@ -1165,10 +1166,10 @@ namespace PckStudio.Rendering
                             {
                                 case "ARM0":
                                 case "SLEEVE0":
-                                    return RightArmMatrix * armRightMatrix;
+                                    return armRightMatrix;
                                 case "ARM1":
                                 case "SLEEVE1":
-                                    return LeftArmMatrix * armLeftMatrix;
+                                    return armLeftMatrix;
                                 case "LEG0":
                                 case "PANTS0":
                                     return legRightMatrix;
@@ -1181,9 +1182,7 @@ namespace PckStudio.Rendering
                         }
 
                         transform *= GetGroupTransform(box.Type);
-                        Vector3 translation = cubeMesh.Translation - cubeMesh.Offset;
-                        Vector3 pivot = cubeMesh.Pivot + cubeMesh.Offset;
-                        transform = Pivot(translation, pivot, transform);
+                        transform *= cubeMesh.Transform;
                         GL.BlendFunc(BlendingFactor.DstAlpha, BlendingFactor.OneMinusSrcAlpha);
                         DrawBoundingBox(transform, cubeBoundingBox, HighlightlingColor);
                         GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
@@ -1293,23 +1292,13 @@ namespace PckStudio.Rendering
 
         private void RenderPart(ShaderProgram shader, CubeGroupMesh cubeMesh, Matrix4 partMatrix, Matrix4 globalMatrix)
         {
-            Vector3 translation = cubeMesh.Translation - cubeMesh.Offset;
-            Vector3 pivot = cubeMesh.Pivot + cubeMesh.Offset;
-            Matrix4 transform = Pivot(translation, pivot, partMatrix);
+            Matrix4 transform = partMatrix;
+            transform *= cubeMesh.Transform;
             transform *= globalMatrix;
             shader.SetUniformMat4("u_Transform", ref transform);
             cubeMesh.Draw(shader);
         }
 
-        private static Matrix4 Pivot(Vector3 translation, Vector3 pivot, Matrix4 target)
-        {
-            var model = Matrix4.CreateTranslation(translation);
-            model *= Matrix4.CreateTranslation(pivot);
-            model *= target;
-            model *= Matrix4.CreateTranslation(pivot).Inverted();
-            return model;
-        }
-        
         protected override void OnUpdate(object sender, TimestepEventArgs e)
         {
             base.OnUpdate(sender, e);