Physics rigidbody.velocity Stutter

Unity Engine
1

I’m moving my player like this:

Update()
{
    if (_isAccelerating && _speed < FarmStableManager.SELECTED_CAMEL_DATA.topSpeed)
    {
        _speed += 6f * Time.deltaTime;
    }
    else if(!_isAccelerating)
    {
        _speed -= 10f * Time.deltaTime;
        _speed = _speed <= 0f ? 0f : _speed;
    }
  
    _rigidbody.velocity = transform.forward * _speed;
}

And i have a couple of AIs moving with NavMeshAgent, the problem is everytime my player gets close to any of the AIs they start to stutter, i’ve already checked the proffiler everything seams fine, the FPS rate is ok, i don’t know why this is happening. Also, if i use transform.Translate this dosen’t happen.

2

Try renaming the “Update” method to “FixedUpdate” and then change the Time.deltaTime to Time.fixedDeltaTime, which is the physics timestep value used in the FixedUpdate method.

FixedUpdate should be used over the normal Update method for physic interactions, as it’s always called in the fixed step intervals:

FixedUpdate()
{
    if (_isAccelerating && _speed < FarmStableManager.SELECTED_CAMEL_DATA.topSpeed)
    {
        _speed += 6f * Time.fixedDeltaTime;
    }
    else
    {
        _speed -= 10f * Time.fixedDeltaTime;
        _speed = _speed <= 0f ? 0f : _speed;
    }
  
    _rigidbody.velocity = transform.forward * _speed;
}
3

Thanks for the reply, but the stutter persists, the weird part is that my player runs just fine, only the AI objects that start stuttering and only when the player is close ( not colliding just nearby ) and moving.

4

I assume you have set the navagent to not control position/rotation?

5

On the AI objects the NavAgent controlls everything, the player object dosen’t even have the navAgent component.

6

Obviously. You will probably need to write your own enemy movement AI script as its likely the navagent stuttering the AI.