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Question by Seventh Stealth · Sep 07, 2013 at 06:29 PM · javascriptvectorfunction update

Could someone fix this : It says expressions must only be executed ofr their side-effects

  private var Bullet : GameObject;
  function Update(){
   //Get input position in pixels (screen-coordinates);
     var screenPos : Vector2;(Input.touches[0].position);
     //Convert from screen coordinates (pixels) to world-coordinates;
     var worldPos : Vector3;(camera.ScreenToWorldPoint(new Vector3(screenPos.x, screenPos.y, camera.nearClipPlane)));
 //Move the empty-object to the location of click/tap;
     transform.position = worldPos;
     //Instantiate a new object at that location
     Instantiate(Bullet , worldPos , Quaternion.identity);
     //Fire away!
 Bullet.rigidbody.AddForce(transform.forward * 5000);
 }

Error reads : Expressions must only be executed for their side effects (4/47)

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Answer by aldonaletto · Sep 07, 2013 at 06:47 PM

Usually this error means something like "what the hell means that!?!?" - coincidentally, the same thing we think when this message appears. In this case, the expressions should be assigned to the Vector2 and Vector3 variables, but there's a semicolon instead of an equal sign (the parenthesis aren't needed too):

 ...
 //Get input position in pixels (screen-coordinates);
 var screenPos : Vector2 = Input.touches[0].position;
 //Convert from screen coordinates (pixels) to world-coordinates;
 var worldPos : Vector3 = camera.ScreenToWorldPoint(new Vector3(screenPos.x, screenPos.y, camera.nearClipPlane));
 ...

NOTE: This script must be attached to the camera, or Null Reference errors will damn you!

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avatar image clunk47 · Sep 07, 2013 at 07:17 PM 0
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Got to it before me lol +1

avatar image Seventh Stealth · Sep 07, 2013 at 10:31 PM 0
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Geez mate thanks a ton :D

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