Moving player to mouse click, falling through scene

Question

Hi

So I have a Cube/box collider as my Player.

I have already applied a JS onto it to make it constantly move forward in my scene. The ground is just a cube/box collider scaled out.

Here's what I have already on the object:

 #pragma strict
 
 function Start () {
 
 }
 
 function Update () {
     transform.Translate(15 * Vector3.forward * Time.deltaTime, Space.World);
 }

Now I tried to attach a new second script to make the object move to where ever I click at on the ground (while it's still constantly moving forward)...

but it makes my object instead start falling through the ground and moves upward. As you can immediately see I have zero coding knowledge but I'm trying to learn :)

 #pragma strict
 
 private var target:Vector3;
 
 function Update () {
     if (Input.GetMouseButtonDown(0)) {
             target = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             target.z = transform.position.z;
         }
         transform.position = Vector3.MoveTowards(transform.position, target, 10 * Time.deltaTime);
 }

What i'm trying to achieve is to setup a standard top down scrolling airplane shooter game. That's why I have the constant-move-forward applied so it moves through the scene/level. I want to be able to move the player around within the screen while the level scene "scrolls" through.

If anyone can even help show me a better way to write this I'd be so appreciative. Thanks!

Answer 1

Answer by xandermacleod · Jun 20, 2014 at 12:41 AM

To understand this better it would be helpful to know if your camera is angled in such a way that Positive Y is the forward direction of your space ship or if it's positive Z.

What is likely happening is that because Input.mousePosition is a 2d vector, your 3d vector has its Y value where its Z value should be.

That would be my guess.

To rectify this you need something like:

 #pragma strict
  
 private var target:Vector3;
 private var tempX:float;
 private var tempY:float;
 private var tempZ:float;
  
 5.function Update () {
     if (Input.GetMouseButtonDown(0)) {
             tempX = Camera.main.ScreenToWorldPoint(Input.mousePosition.x);
             tempY = transform.position.z;
             tempZ = Camera.main.ScreenToWorldPoint(Input.mousePosition.y);
             target = new Vector3(tempX, tempY, tempZ);
         }
 10.        transform.position = Vector3.MoveTowards(transform.position, target, 10 * Time.deltaTime);
 }

(my apologies if this isn't accurate on line8. Im a C# user not a javascript user so I don't know if jacascript needs to use the word 'new' before the vector3).

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lvl9hero · Jun 21, 2014 at 01:54 AM 0

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heya, thanks for trying to help me out, really thankful :)

but i'm already getting some errors, it seems like Vector3 can't be used as a "float"?

here's the errors Unity is giving:

 Movement.js(12,51): BCE0017: The best overload for the method 'UnityEngine.Camera.ScreenToWorldPoint(UnityEngine.Vector3)' is not compatible with the argument list '(float)'.
 Movement.js(12,51): BCE0022: Cannot convert 'UnityEngine.Vector3' to 'float'.

Speaking of my camera's angle, it is setup in a traditional 3rd-person angle, somewhat at a 45degree tilt downwards looking/chasing the player...

Will that really complicate movement with mouseclicks? I was imagining it was simple as making sure we're using World coordinate values instead of local... or something like that yea.. hehe

Moving player to mouse click, falling through scene

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