MovePosition has different behavior depending on the machine

Scripting
1

I’ve noticed that the following code leads to completely different behaviors on different machines:

rb2d = GetComponent<RigidBody2D>();
//Move GameObject up
rb2d.MovePosition(rb2d.position + Vector2.up * Time.deltaTime);

Editor: Moves at the correct speed
Build on my Windows: Moves way too slowly
Build on a Linux machine: Moves way too quickly

Is there any reason for this? Am I doing something wrong?

2

Where is the code being excuted from? Update or FixedUpdate?

1 Like
3

I think you just fixed the problem. I had it in Update. :roll_eyes:

4

Having Time.deltaTime in there should compensate for differences in framerates, though.

5

I’m not sure why it behaves like this. All I can say is that there’s absolutely no other script on my GameObject at all. It’s supposed to just move up at a set speed. But the speed seems vary from ‘barely moving’ to ‘way too fast’.

6

Can you put a number on how much faster/slower it’s moving? Is it something straightforward like 2x as fast, for example? Is it a consistent speed?

7

post your full script or update method.

8

That is basically the full script. The rest has nothing to do with the speed.

using UnityEngine;
using System.Collections;

public class EnemyRed : MonoBehaviour
{
    private bool movingUp = false;
    Rigidbody2D rb2d;
    public float speed;

    private void Awake()
    {
        rb2d = GetComponent<Rigidbody2D>();
    }

    private void Update()
    {
        if (movingUp)
        {
            rb2d.MovePosition(rb2d.position + Vector2.up * speed * Time.deltaTime);
            if (rb2d.position.y >= 5f)
                movingUp = false;
        }
        else
        {
            rb2d.MovePosition(rb2d.position + Vector2.down * speed * Time.deltaTime);
            if (rb2d.position.y <= -5f)
                movingUp = true;
        }
    }
}

The speed difference is really drastic. The faster one is the Editor (which is correct) and the slower one is the Windows build. I don’t have one from Linux right now, but it was about 2x faster than the left one.

9

I’ve never used rigidibody moveposition myself but it appears it depends on the rigidbody settings as to how it behaves.

For a simple move like that, I would use waypoints myself.