MergeAndTakeOwnership method

void MergeAndTakeOwnership(GeometryBuilder other, [ Matrix4? mat, Matrix3? matNormal ])

Implementation

void MergeAndTakeOwnership(GeometryBuilder other,
    [VM.Matrix4? mat, VM.Matrix3? matNormal]) {
  if (other.vertices.length == 0) return;
  final int offset = vertices.length;

  assert(pointsOnly == other.pointsOnly);
  for (String a in attributes.keys) {
    assert(other.attributes.containsKey(a));
  }
  for (String a in other.attributes.keys) {
    assert(attributes.containsKey(a));
    switch (a) {
      case aNormal:
        assert(matNormal != null, "no normal matrix provided");
        for (VM.Vector3 v in other.attributes[a] as List<VM.Vector3>) {
          attributes[a]!.add(v..applyMatrix3(matNormal!));
        }
        break;
      default:
        attributes[a]!.addAll(other.attributes[a] as List);
    }
  }
  other.attributes.clear();

  for (VM.Vector3 v in other.vertices) {
    if (mat == null) {
      vertices.add(v);
    } else {
      vertices.add(v..applyMatrix4(mat));
    }
  }
  other.vertices.clear();

  for (Face3 face in other.faces3) {
    face.a += offset;
    face.b += offset;
    face.c += offset;
    faces3.add(face);
  }
  other.faces3.clear();

  for (Face4 face in other.faces4) {
    face.a += offset;
    face.b += offset;
    face.c += offset;
    face.d += offset;
    faces4.add(face);
  }
  other.faces4.clear();
}