This version of the spaceship script works in Unity 2018

[stef_7]

I had problems making the spaceship script work (haven’t tried the bullet script yet). Here are the changes I’ve done to the script to make it work for me in Unity 2018 :

– the rigidbody2D.AddForce()… line is not working in Unity 2018. I’ve changed this line and added 2 other lines (look for them in the vicinity of the void Start() line)
–  my spaceship was jumping to one corner of the screen just after the start of the game. The reason was the values for screenSW and screenNE were inverted so I changed the lines were they get their values and it fixed the problem.  EDIT : no need to do this change, problem was my camera was not set properly, it needs to be set to ‘orthographic’

Here’s the whole script.

******************************************************************

using
UnityEngine;

using
System.Collections;

using
System.Collections.Generic;

public
class
Spaceship
: MonoBehaviour {

    public
GameObject spaceshipBulletPrefab;

    public
float
speed =  1f;

    public
float
turnSpeed = 1f;

    public
float
fireRate = 0.5f;

    private
float
accelRate = 0f;

    private
Animator animator;

    private
Vector3 screenSW;

    private
Vector3 screenNE;

    private
float
wrapPadding = 1f;

    private
bool
hit = false;

    private
float
nextFire;

   public
Rigidbody2D rb2D;

   // Use this for initialization

   void
Start
() {

        animator = GetComponent<Animator>();

       rb2D = GetComponent<Rigidbody2D>();

       screenNE = Camera.main.ScreenToWorldPoint(new
Vector3(0, 0, Camera.main.transform.localPosition.z));

 

       screenSW = Camera.main.ScreenToWorldPoint(new
Vector3(Screen.width, Screen.height, Camera.main.transform.localPosition.z));

   

   }

    

    // Update is called once per frame

    void
Update
() {

        float
translation = Input.GetAxis(“Vertical”);

        float
rotation = Input.GetAxis(“Horizontal”);

        if(rotation > 0){

            TurnRight(rotation);

        }

        else
if(rotation < 0){

            TurnLeft(rotation);

        }

        if(translation >= 0.5f){

            Move(translation);

        }

        else{

            Idle();

        }

        if(Input.GetButton(“Jump”)){

            ShootBullet();

        }

       rb2D.AddForce(transform.up * (speed * accelRate));

       

       if
(transform.localPosition.x < screenSW.x – wrapPadding){

            transform.localPosition = new
Vector3(screenNE.x, transform.localPosition.y, transform.localPosition.z);

        }

        else
if(transform.localPosition.x > screenNE.x + wrapPadding){

            transform.localPosition = new
Vector3(screenSW.x, transform.localPosition.y, transform.localPosition.z);

        }

        if(transform.localPosition.y < screenSW.y – wrapPadding){

            transform.localPosition = new
Vector3(transform.localPosition.x, screenNE.y, transform.localPosition.z);

        }

        else
if(transform.localPosition.y > screenNE.y + wrapPadding){

            transform.localPosition = new
Vector3(transform.localPosition.x, screenSW.y, transform.localPosition.z);

        }

       

    }

    public
void
TurnRight(float
rotation = 1){

        if(hit){

            return;

        }

        transform.Rotate(Vector3.back * (rotation * turnSpeed));

    }

    public
void
TurnLeft(float
rotation = 1){

        if(hit){

            return;

        }

        

        transform.Rotate(Vector3.forward * (rotation * -turnSpeed));

    }

    public
void
Move(float
accel){

        if(hit){

            return;

        }

        accelRate = accel;

        animator.SetInteger(“State”, 1);

    }

    public
void
Idle(){

        if(hit){

            return;

        }

        accelRate = accelRate * 0.5f;

        animator.SetInteger(“State”, 0);

    }

    public
void
ShootBullet(){

        if(hit){

            return;

        }

        if(Time.time > nextFire){

            nextFire = Time.time + fireRate;

            Instantiate(spaceshipBulletPrefab, transform.localPosition, transform.localRotation);

        }

    }

}

[Jonathan Gonzalez]

Great!  I may need to go through the project files to see what needs to be updated. From time to time Unity changes the script API and usually  makes it easy on you by updating the script for you. Sometimes you’ll see a popup say that Unity will update your scripts and it’ll add that kind of stuff in. 

[stef_7]

Yes, I’ve seen this kind of pop up at times. My guess is it’s more likely to happen if the version of Unity is not too different from the old one (maybe just one or two generations more recent).

Anyway, I’m more than halfway into the tutorial now and that’s the only change I had to do (btw, this is a very nice project to do 🙂  ).

About the lines where I swapped the definitions of screenSW and screenNE, the problem was not the script but my camera. It was set to perspective instead of orthographic.

[Author]

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