translate method
Translate this by offset.
Implementation
void translate(Vector3 offset) {
  _point0.add(offset);
  _point1.add(offset);
  _point2.add(offset);
}Translate this by offset.
void translate(Vector3 offset) {
  _point0.add(offset);
  _point1.add(offset);
  _point2.add(offset);
}