Synchronize object positions

Questions & Answers
1

I have these saws that move around those trails in pairs and at a constant speed. When I test this on my computer with good FPS it all works great and they move as intended.

But when I test it on iPad (low and oscillating FPS) the saws in each pair start to move differently, sometimes they get closer to each other and other times they get farther away. I’m having an hard time coming up with a solution for this, maybe you guys can help me.

31617-serras_lup.png
31617-serras_lup.png378×583 191 KB

This is my Update function:

private void Update(){
        //Saw Rotation
        BladeTransform.rotation *= Quaternion.AngleAxis(SawRotSpeed*360*Time.deltaTime, -transform.forward);
 
 
        //Saw Movement
        transform.position = Vector3.Lerp(_curStartPos, _destinyPos, _sawTimer);
        if (_sawTimer < 1) _sawTimer += (Time.deltaTime*1.2f*TilesPerSec)/_distanceNextWaypoint;
        else{
            _sawTimer = 0;
            _curStartPos = transform.position;
            if (Inverse){
                if (_destinyWaypoint == 0) _destinyWaypoint = WayPoints.Count - 1;
                else _destinyWaypoint--;
            }
            else{
                if (_destinyWaypoint >= (WayPoints.Count - 1)) _destinyWaypoint = 0;
                else _destinyWaypoint++;
            }
            _destinyPos = WayPoints[_destinyWaypoint].position;
            _distanceNextWaypoint = Vector3.Distance(_destinyPos, _curStartPos);
        }
}

I use the common method of:

Timer = 0;
Lerp(start,end,Timer);
if(Timer<1) Timer+=Time.deltatime;

I always used this for movement but never on a situation where I needed two objects to be synchronised with each other, am I doing something wrong or is there any other way of doing this on which I can have these saws synchronised with each other?

2

Why are you dividing the timer increase by _distanceNextWaypoint? That would cause them to move in different speeds depending on the length of the vector. is that what you planned? If they start in different locations, and the distance to the waypoint is different, they will move in different speeds.

Also, maybe share some more code, variable declarations, etc. Could _sawTimer be static or modifiedby other parts of code?

If still no solution, try printing it out debug values. Print out _sawTimer and (Time.deltaTime*1.2f*TilesPerSec)/_distanceNextWaypoint; (the increase in _sawTimer).

Check that the increase is the same for all saws and the _sawTimer increases as expected every frame.