smooth static method

void smooth(Float32List g, TerrainOptions options, [ double weight = 0 ])

Smooth the terrain by setting each point to the mean of its neighborhood.

Float32List g The geometry's z-positions to modify with heightmap data. TerrainOptions options A map of settings that control how the terrain is constructed and displayed. Valid values are the same as those for the options parameter of {@link THREE.Terrain}(). double weight = 0 How much to weight the original vertex height against the average of its neighbors.

Implementation

static void smooth(Float32List g, TerrainOptions options, [double weight = 0]) {
  final heightmap = Float32List(g.length);
  for (int i = 0, xl = options.xSegments + 1, yl = options.ySegments + 1; i < xl; i++) {
    for (int j = 0; j < yl; j++) {
      double sum = 0;
      int c = 0;
      for (int n = -1; n <= 1; n++) {
        for (int m = -1; m <= 1; m++) {
          final key = (j+n)*xl + i + m;
          if (i+m >= 0 && j+n >= 0 && i+m < xl && j+n < yl) {//typeof g[key] != 'undefined' &&
            sum += g[key];
            c++;
          }
        }
      }
      heightmap[j*xl + i] = sum / c;
    }
  }
  weight = weight;
  final w = 1 / (1 + weight);
  for (int k = 0, l = g.length; k < l; k++) {
    g[k] = (heightmap[k] + g[k]*weight)*w;
  }
}