diff --git a/Disp/DemoSatellite.cs b/Disp/DemoSatellite.cs
index 265b755..ba601e8 100644
--- a/Disp/DemoSatellite.cs
+++ b/Disp/DemoSatellite.cs
@@ -6,7 +6,7 @@ namespace Sample.Disp
     /// <summary>
     /// Demonstrates a simple solar system animation using <see cref="IDisplayee"/> interface.
     /// Shows how to create a hierarchical transform structure with sun, earth and moon using
-    /// <see cref="Mat4d"/> matrices and model matrix stack transformations.
+    /// <see cref="mat4d_t"/> matrices and model matrix stack transformations.
     /// </summary>
     /// <remarks>
     /// ### Source Code
@@ -30,12 +30,12 @@ namespace Sample.Disp
 		{
 			sun.Display(bind);
 			bind.ModelMatStack.Push();
-			bind.ModelMatStack.Mul(new Mat4d(new AxisAngle4d(new vec3d_t(0, 0, 1), angle_earth += 0.03)));
-			bind.ModelMatStack.Mul(new Mat4d(new vec3d_t(12, 0, 0)));
+			bind.ModelMatStack.Mul(new mat4d_t(new AxisAngle4d(new vec3d_t(0, 0, 1), angle_earth += 0.03)));
+			bind.ModelMatStack.Mul(new mat4d_t(new vec3d_t(12, 0, 0)));
 			earth.Display(bind);
 			bind.ModelMatStack.Push();
-			bind.ModelMatStack.Mul(new Mat4d(new AxisAngle4d(new vec3d_t(0, 0, 1), angle_moon += 0.02)));
-			bind.ModelMatStack.Mul(new Mat4d(new vec3d_t(4, 0, 0)));
+			bind.ModelMatStack.Mul(new mat4d_t(new AxisAngle4d(new vec3d_t(0, 0, 1), angle_moon += 0.02)));
+			bind.ModelMatStack.Mul(new mat4d_t(new vec3d_t(4, 0, 0)));
 			moon.Display(bind);
 			bind.ModelMatStack.Pop();
 			bind.ModelMatStack.Pop();
diff --git a/Mech/DemoTopo1.cs b/Mech/DemoTopo1.cs
index 518020a..23e7742 100644
--- a/Mech/DemoTopo1.cs
+++ b/Mech/DemoTopo1.cs
@@ -44,9 +44,9 @@ public static class DemoTopo1
 		brnB.Step = MathUtil.ToRad(-60);
 
 		//Get and show the transform matrices relative to O.
-		Dictionary<Anchor, Mat4d> matMap = asmb.GetMat4dMap(O);
+		Dictionary<Anchor, mat4d_t> matMap = asmb.GetMat4dMap(O);
 		Console.WriteLine("Transform Matrix relative to O:");
-		foreach (KeyValuePair<Anchor, Mat4d> keyValue in matMap)
+		foreach (KeyValuePair<Anchor, mat4d_t> keyValue in matMap)
 			Console.WriteLine($"{keyValue.Key.Name} : {keyValue.Value}");
 		#endregion