code: function(dimensions) {
     var simplex = new gamejs.math.noise.Simplex(Math);
     var surfaceData = [];
     for (var i=0;i<dimensions[0];i++) {
        surfaceData[i] = [];
        for (var j=0;j<dimensions[1];j++) {
           var val = simplex.get(i/50, j/50) * 255;
           surfaceData[i][j] = val;
        }
     }
     return surfaceData;
  }
docs: create array with noise data to display