2D game - Sprite deformation when add frce

Question

Hi.

I created an image and added to it Collider, Rigidbody2D. Also I create script with function which called when pressing the space key and AddForce to this image. After when I start project and press Space key I saw that object start deformed. Whel it collision with other object Player very deformaed. It is deformed and stretched in width upwards. But when I set equal force for X and Y axis Player didn't deformed. For example

 transform.AddForce(500f, 3000f); // Deformed
 
 transform.AddForce(3000f, 3000f);//  Not deformed

alt text

Ball components alt text

Ball script with AddForce

 void Update () {
         if (Input.GetKeyDown(KeyCode.Space))
         {
             Debug.Log("Add force");
             GetComponent<Rigidbody2D>().AddForce(new Vector2(xForce, yForce));
         }
 }

What do to fix this problem?

Answer 1

Answer by MelvMay · Nov 13, 2016 at 03:38 PM

Can you please explain what you mean by 'deformed'? Do you mean the scale changes? Adding a force or colliders contacting do not change the Transform scale so you must have some other script/animation doing that.

Adding a force only changes the velocity of a Rigidbody2D and nothing else.

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stas0 · Nov 13, 2016 at 03:41 PM 0

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Sorry for my bad english, 'deformed' I mean the deformation. I don't have any script that do deformation with ball, only ball script that call AddFroce when press Space key. After this ball start change scale.

MelvMay stas0 · Nov 13, 2016 at 03:44 PM 0

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I honestly have no idea. There's no way a Rigidbody2D can set the scale of the Transform. The only other option is to submit a bug case for Unity QA to look at it.

stas0 MelvMay · Nov 13, 2016 at 03:45 PM 0

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Ok. What version of Unity you use?

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Answer 2

Answer by amimox · Nov 13, 2016 at 04:22 PM

Hi ! First of all you shouldn't use GetComponent method each frame just to get the same rigidbody. This is very bad for performance.

 private RigidBody2D rb;
 void Start(){
      rb = GetComponent<RigidBody2D>();
 }
 
  void Update () {
          if (Input.GetKeyDown(KeyCode.Space))
          {
              Debug.Log("Add force");
              rb.AddForce(new Vector2(xForce, yForce));
          }
  }

Also don't use a Gravity scale of 110. That is very bad and can cause severe problem. This show a problem in your current hierarchy. Try to tweak the size of your game object instead of computing crazy Physics parameters.

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2D game - Sprite deformation when add frce

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