@Override
public boolean equals(final Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
RayImpl other = (RayImpl) obj;
if (direction == null) {
if (other.direction != null) return false;
} else if (!direction.equals(other.direction)) return false;
if (origin == null) {
if (other.origin != null) return false;
} else if (!origin.equals(other.origin)) return false;
return true;
}
