build method

MeshSurfaceSampler build()

Implementation

MeshSurfaceSampler build() {
  final positionAttribute = this.positionAttribute;
  final weightAttribute = this.weightAttribute;
  final faceWeights = Float32List( positionAttribute.count ~/ 3 ); // Accumulate weights for each mesh face.

  for ( int i = 0; i < positionAttribute.count; i += 3 ) {
    num faceWeight = 1.0;

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

    if(i < positionAttribute.count) {
      _face.a.fromBuffer( positionAttribute, i );
    }

    if(i + 1 < positionAttribute.count) {
      _face.b.fromBuffer( positionAttribute, i + 1 );
    }

    if(i + 2 < positionAttribute.count) {
      _face.c.fromBuffer( positionAttribute, i + 2 );
    }

    faceWeight *= _face.getArea();
    faceWeights[ i ~/ 3 ] = faceWeight.toDouble();
  } // Store cumulative total face weights in an array, where weight index
  // corresponds to face index.


  distribution = Float32List( positionAttribute.count ~/ 3 );
  num cumulativeTotal = 0;

  for(int i = 0; i < faceWeights.length; i ++) {
    cumulativeTotal += faceWeights[ i ];
    distribution![ i ] = cumulativeTotal.toDouble();
  }

  return this;
}