<languageVersion: 1.0;> // The languageVersion is required in PixelBender files. This was added in the 2nd pre-release, and MUST be declared on the first line (comments excluded)
  kernel Vortex
  <
      namespace: "For the most part based on code by Jerry Huxtable";
      vendor: "";
      version: 1;
      description: "A cool vortext kaliedoscope effect.";
  >
  {
      
      input image4 src;
      output pixel4 dst;
      
      parameter float2 size
      <
          minValue: float2(0.0, 0.0);
          maxValue: float2(600.0, 400.0);
          defaultValue: float2(300.0, 200.0);
      >;
      
      parameter float2 center
      <
          minValue: float2(0.0, 0.0);
          maxValue: float2(300.0, 200.0);
          defaultValue: float2(0.0, 0.0);
      >;
      
      void evaluatePixel()
      {
          float2 coord = outCoord();
          float dx = coord.x - center[0];
          float dy = coord.y - center[1];
          float d2 = dx * dx + dy * dy;
          coord.x = center[0] + center[0] * center[0] * dx / d2;
          coord.x = mod(coord.x, size[0]);
          coord.y = center[1] + center[1] * center[1] * dy / d2;
          coord.y = mod(coord.y, size[1]);
          dst = sampleNearest(src, coord);
      }
  }