getTiePoints() {
    if (!this.fileDirectory.ModelTiepoint) {
      return [];
    }

    const tiePoints = [];
    for (let i = 0; i < this.fileDirectory.ModelTiepoint.length; i += 6) {
      tiePoints.push({
        i: this.fileDirectory.ModelTiepoint[i],
        j: this.fileDirectory.ModelTiepoint[i + 1],
        k: this.fileDirectory.ModelTiepoint[i + 2],
        x: this.fileDirectory.ModelTiepoint[i + 3],
        y: this.fileDirectory.ModelTiepoint[i + 4],
        z: this.fileDirectory.ModelTiepoint[i + 5],
      });
    }
    return tiePoints;
  }
Returns an array of tiepoints.
@returns {Object[]}