Why Is The "while" Function For C# Crashing Game Engine?-CodePudding

I am working on a game made in Unity Engine. For Movement, I have used vector2. But for vector2, you need to spam the buttons in order for the player to move. So i tried "while" function to loop the process. Here is the main code

    if (Input.GetKeyDown(KeyCode.W))
    {
        i = 5;

    }

    //test

    if (Input.GetKeyUp(KeyCode.W))
    {
        i = 1;
    }

    
   

    while(i !=1)
    {
        rb.AddForce(Vector2.up * JumpForce);
    }

However, when I run it the engine crashes. Why? Just to let you know, there are no compiler errors.

CodePudding user response：

In Unity, the physics movement should be done in FixedUpdate, and input checking in Update. Something like this:

[SerializeField] private Rigidbody _rb;
[SerializeField] private float _jumpForce;

private bool _addForce;

private void OnUpdate()
{
    _addForce = Input.GetKey(KeyCode.W);
}

private void FixedUpdate()
{
    if (_addForce) _rb.AddForce(Vector2.up * _jumpForce);
}

If you add a while in the Update, it will stuck in that frame, freezing the main loop, and the engine can't poll for new inputs, so your Update can't continue.

CodePudding user response：

The repeated addforces might be a bit much for the PC.

Do this:

if (Input.GetKey(KeyCode.W))
{
    rb.AddForce(Vector2.up * JumpForce);
}

This way it only moves when key is being held.