worldMatrix property

Implementation

Matrix4 get worldMatrix {
  final parent = _parent;

  if (parent == null) {
    if (_localDirty || _seenParentVersion != 0) {
      if (_localDirty) _recomputeLocal();
      _worldMatrix.setFrom(_localMatrix);
      // 0 marks "no parent", distinct from any real stamp.
      _seenParentVersion = 0;
      _bumpWorld();
    }
    return _worldMatrix;
  }

  // Resolving the parent first means ancestors are refreshed before we read
  // their stamp, so one access repairs the whole chain.
  final parentWorld = parent.worldMatrix;
  if (_localDirty || parent._worldVersion != _seenParentVersion) {
    if (_localDirty) _recomputeLocal();
    _worldMatrix.setFrom(parentWorld);
    _worldMatrix.multiply(_localMatrix);
    _seenParentVersion = parent._worldVersion;
    _bumpWorld();
  }
  return _worldMatrix;
}