jumping error!?

Question

i am making a 2d platformer that involves jumping but when i put my code in it gives me this error: Unknown identifier moveDirection. but i know it should a known identifier because it's highlighted orange!

my script:

var jumpSpeed = 5.0;

if(Input.GetKeyDown("UpArrow"))

{

moveDirection.y = jumpSpeed;

}

p.s. please help!

Answer 1

Answer by Eric5h5 · Aug 19, 2010 at 07:20 PM

It's unknown because you haven't defined it anywhere. You need to define variables before you can use them.

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john 2 · Aug 19, 2010 at 07:35 PM 0

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what do i need to put in after i type var moveDirection = ? if i put a number it comes up with an error.please comment back! thanks!

TenKHoursDev · Nov 23, 2018 at 01:19 AM 0

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You need to use datatypes instead of the generic 'var'. It's good practice and will help you hone your skills. But you said you need a direction so you ought to write "var moveDirection = new vector3(x, y,z);"

Answer 2

Answer by Statement · Dec 10, 2010 at 09:05 PM

Try this.

var jumpSpeed = 5.0; var moveDirection : Vector3;

if(Input.GetKeyDown("UpArrow"))
{
    moveDirection.y = jumpSpeed;
}

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Answer 3

Answer by FallingRocketGames · Nov 23, 2018 at 02:00 AM

I believe you should be approaching this issue in a different way, I recommend you to use AddForce and study a little about the Rigidbody2d component in your Player, also check about ForceMode like Impulse. https://docs.unity3d.com/ScriptReference/Rigidbody2D.AddForce.html https://docs.unity3d.com/ScriptReference/ForceMode2D.html

  public float Speed;
  void FixedUpdate()
  {
 
      if (Input.GetKey(KeyCode.Space))
      {
 
          GetComponent<Rigidbody2D>().AddForce(Vector2.up* Speed);
      }
  }

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Answer 4

Answer by LearningWhileScrewing · Nov 23, 2018 at 04:11 AM

var jumpSpeed = 5.0; var moveDirection Vector2; if(Input.GetKeyDown("UpArrow"))

{

moveDirection.y = jumpSpeed;

} //this is javascript, so not good at javascript // lower 1 is c# //============ public float jumpSpeed; public Rigidbody2D rb2d; void Start() { rb2d = GetComponent(); }

void Update() {

   if (Input.GetKey("up"))
   {
      Vector2 movement = new Vector2(0, 5);
       if(movement != Vector2.zero) {
       rb2d.AddForce(movement * jumpSpeed);

} } }

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jumping error!?

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