build method

dynamic build()

Implementation

build() {
  var positionAttribute = this.positionAttribute;
  var weightAttribute = this.weightAttribute;

  var faceWeights = Float32Array(positionAttribute.count ~/ 3);

  // Accumulate weights for each mesh face.

  for (var i = 0; i < positionAttribute.count; i += 3) {
    double faceWeight = 1;

    if (weightAttribute != null) {
      faceWeight = weightAttribute.getX(i)!.toDouble() +
          weightAttribute.getX(i + 1)!.toDouble() +
          weightAttribute.getX(i + 2)!.toDouble();
    }

    _face.a.fromBufferAttribute(positionAttribute, i);
    _face.b.fromBufferAttribute(positionAttribute, i + 1);
    _face.c.fromBufferAttribute(positionAttribute, i + 2);
    faceWeight *= _face.getArea();

    faceWeights[i ~/ 3] = faceWeight;
  }

  // Store cumulative total face weights in an array, where weight index
  // corresponds to face index.

  distribution = Float32Array(positionAttribute.count ~/ 3);

  double cumulativeTotal = 0;

  for (var i = 0; i < faceWeights.length; i++) {
    cumulativeTotal += faceWeights[i];

    distribution![i] = cumulativeTotal;
  }

  return this;
}