diff --git a/Demo/Form1.cs b/Demo/Form1.cs
index 4bb4049..87737ed 100644
--- a/Demo/Form1.cs
+++ b/Demo/Form1.cs
@@ -22,9 +22,6 @@ namespace Demo
             CreateTrackBars();
             InitializeImage();
         }
-        
-
-        double angle = 0;
 
         private void Render(Bitmap bmp)
         {
@@ -43,7 +40,6 @@ namespace Demo
             double[] angles = angleSelectBars.Select(b => b.Angle).ToArray();
             projector4d3d.CoordSystem.RotationMatrix
                 = YMath.Matrix.Rotation(4, angles);
-            angle += 0.01;
 
             geom = projector4d3d.Project(geom);
             geom = projector3d2d.Project(geom);