void
      evaluatePixel()
      {
          // Crystallize, pseudo Voronoi-diagram using three nearby points,
          // calculated from 'randomly' placed and rotated rectangular grids 
          
          // 1st grid and point
          float div=size;
          float2 newP= base1 + rot1r*div*( floor( rot1*(outCoord()-base1)/div ) +0.5);
          
          // 2nd grid
          div= 21.0/20.0*size; // factor 21, I picked some number that has no common denominators with the default size 20
          float2 p= base2 + rot2r*div*( floor( rot2*(outCoord()-base2)/div  ) +0.5);
          // comparing distance to the 1st sample point
          newP =  length(p-outCoord()) < length(newP-outCoord()) ? p : newP;
  
          // 3rd grid
          div= 19.0/20.0*size;
          p= div*( floor( outCoord()/div  ) +0.5);
          // comparing distance
          newP =  length(p-outCoord()) < length(newP-outCoord()) ? p : newP;
          
          // the new color is picked from the nearist point
          dst = sampleNearest(src,newP);
      }
  }