diff --git a/Quik/QuikGeometry.cs b/Quik/QuikGeometry.cs
index 575e304..bf10243 100644
--- a/Quik/QuikGeometry.cs
+++ b/Quik/QuikGeometry.cs
@@ -485,9 +485,9 @@ namespace Quik
         public static void Translation(out QMat4 mat, float x, float y, float z)
         {
             mat = Identity;
-            mat.M41 = x;
-            mat.M42 = y;
-            mat.M43 = z;
+            mat.M14 = x;
+            mat.M24 = y;
+            mat.M34 = z;
         }
 
         public static void Scale(out QMat4 mat, float x, float y, float z)
@@ -517,5 +517,32 @@ namespace Quik
             mat.M34 = -c * (far + near);
             mat.M44 = 1.0f;
         }
+
+        public static QMat4 operator *(in QMat4 a, in QMat4 b)
+        {
+            QMat4 mat4 = default;
+
+            mat4.M11 = a.M11 * b.M11 + a.M12 * b.M21 + a.M13 * b.M31 + a.M14 * b.M41;
+            mat4.M12 = a.M11 * b.M12 + a.M12 * b.M22 + a.M13 * b.M32 + a.M14 * b.M42;
+            mat4.M13 = a.M11 * b.M13 + a.M12 * b.M23 + a.M13 * b.M33 + a.M14 * b.M43;
+            mat4.M14 = a.M11 * b.M14 + a.M12 * b.M24 + a.M13 * b.M34 + a.M14 * b.M44;
+            
+            mat4.M21 = a.M21 * b.M11 + a.M22 * b.M21 + a.M23 * b.M31 + a.M24 * b.M41;
+            mat4.M22 = a.M21 * b.M12 + a.M22 * b.M22 + a.M23 * b.M32 + a.M24 * b.M42;
+            mat4.M23 = a.M21 * b.M13 + a.M22 * b.M23 + a.M23 * b.M33 + a.M24 * b.M43;
+            mat4.M24 = a.M21 * b.M14 + a.M22 * b.M24 + a.M23 * b.M34 + a.M24 * b.M44;
+            
+            mat4.M31 = a.M31 * b.M11 + a.M32 * b.M21 + a.M33 * b.M31 + a.M34 * b.M41;
+            mat4.M32 = a.M31 * b.M12 + a.M32 * b.M22 + a.M33 * b.M32 + a.M34 * b.M42;
+            mat4.M33 = a.M31 * b.M13 + a.M32 * b.M23 + a.M33 * b.M33 + a.M34 * b.M43;
+            mat4.M34 = a.M31 * b.M14 + a.M32 * b.M24 + a.M33 * b.M34 + a.M34 * b.M44;
+            
+            mat4.M41 = a.M41 * b.M11 + a.M42 * b.M21 + a.M43 * b.M31 + a.M44 * b.M41;
+            mat4.M42 = a.M41 * b.M12 + a.M42 * b.M22 + a.M43 * b.M32 + a.M44 * b.M42;
+            mat4.M43 = a.M41 * b.M13 + a.M42 * b.M23 + a.M43 * b.M33 + a.M44 * b.M43;
+            mat4.M44 = a.M41 * b.M14 + a.M42 * b.M24 + a.M43 * b.M34 + a.M44 * b.M44;
+
+            return mat4;
+        }
     }
 }
\ No newline at end of file