add method
Add arg
to this.
Implementation
void add(Vector3 arg) {
final argStorage = arg._v3storage;
_v3storage[0] = _v3storage[0] + argStorage[0];
_v3storage[1] = _v3storage[1] + argStorage[1];
_v3storage[2] = _v3storage[2] + argStorage[2];
}