What is wrong with this script?

Questions & Answers
1

This is my 5th augmentation of some code to make a cube move. That’s it, just move in any direction at any speed and I have been ripping my hair out for 2 days trying to get it to work. I have copied and pasted Unity’s own, 2016 updated code and it doesn’t even come close to working. This is my best variation with what I think is the most comprehensible error message… \ CS1501: No overload for method 'AddForce takes ‘4’ arguments \ I’ve looked it up and it looks like it happens when you improperly call a variable although I don’t see where this is happening. I even removed all the variables including void Move() and it still gave me that error. Here is the code…

using UnityEngine;
using System.Collections;

public class SimpleMovement : MonoBehaviour {

public float thrust = 10;
public Rigidbody2D rb2D;
void Start () 
{
	rb2D = GetComponent<Rigidbody2D> ();
}

void Move () 
{
	rb2D.AddForce(0, thrust, 0 , ForceMode.Impulse);
}

void Update() 
{
	if(Input.GetKeyDown(KeyCode.Space))
		Move();
	Debug.Log ("I hate C#");
}

}

And please, don’t just copy and paste Unity Docs in a lazy response, there is nothing left for me there…

3

Hey there,

This should be pretty simple, the first argument that you have set to 0 in the addForce function is an int value, but the function requires a vector2 value. This means it requires both an x and y value. Also you only need the force and force mode, it should only be 2 arguments try this;

public Vector2 thrust;
public Rigidbody2D rb2D;
void Start () 
{
    thrust = new Vector2(1,4);//thrust will be 4 times as strong in the y af it is in the x
    rb2D = GetComponent<Rigidbody2D> ();
}
void Move () 
{
    rb2D.AddForce(thrust, ForceMode2D.Impulse);
}
void Update() 
{
    if(Input.GetKeyDown(KeyCode.Space))
        Move();
    Debug.Log ("I hate C#");
}

I hope this helps!

2

Please read the documentation a little more carefully

The method takes 2 arguments: Vector2 force, ForceMode2D mode = ForceMode2D.Force

“0, thrust, 0” is not a Vector2 !!!

Here´s how you define a Vector2:

new Vector2(x,y);

where x and y are float variables that specify direction in x,y axis.

4

Your problem is that you are not specifying that you are moving in a Vector2 you are trying to move in a Vector3 with specifying that it is a Vector3.

void Move ()
{
rb2D.AddForce(new Vector2(thrust, 0), ForceMode.Impulse);
}