private void Start()
{
_waterSurfaceObj = GameObject.FindGameObjectWithTag("WaterSurface");
if (_waterSurfaceObj == null)
{
print("it's null");
}
_floatObjRB = GetComponent <Rigidbody>();
_waterHeight = _waterSurfaceObj.transform.position.y;
_modifyBoatMesh = new ModifyBoatMesh(gameObject, _waterHeight);//
float volume = FloatHelper.MeshVolume(GetComponent <MeshFilter>());
_floatObjRB.mass = _objectDensity * volume;
}