// rot1: rotation matrix, 18 degrees
      // rot1r: reverse rotation, -18 degrees
      // base1: rotation base point (somewhere far enough from origin)
      const float2x2 rot1 = float2x2(0.951,0.309,-0.309,0.951);
      const float2x2 rot1r = float2x2(0.951,-0.309,0.309,0.951);
      const float2 base1= float2(2400,-100);
  
      // rot2: rotation matrix, 30 degrees
      // rot2r: reverse rotation, -30 degrees
      // base2: base point 
      const float2x2 rot2 = float2x2(0.866,0.5,-0.5,0.866); // 30 degress
      const float2x2 rot2r = float2x2(0.866,-0.5,0.5,0.866);
      const float2 base2= float2(-100,2400);