lookAt method
Implementation
BufferGeometry lookAt(Vector3 vector) {
  _bufferGeometryobj.lookAt(vector);
  _bufferGeometryobj.updateMatrix();
  applyMatrix4(_bufferGeometryobj.matrix);
  return this;
}
BufferGeometry lookAt(Vector3 vector) {
  _bufferGeometryobj.lookAt(vector);
  _bufferGeometryobj.updateMatrix();
  applyMatrix4(_bufferGeometryobj.matrix);
  return this;
}