How to roll a ball ?

Question

Hi guys,

I am making a game where the main player is a ball and I want to make the ball roll when I move it. How can I make that? What script should I write?

Thanks.

Answer 1

Answer by POLYGAMe · Jan 29, 2012 at 10:18 PM

A simple way would be to use transform.Translate as well as transform.Rotate, so that the ball rotated as it moved:

 // Moves ball along the X and rotates on the z to simulate rolling
 transform.Translate(5, 0, 0);
 transform.Rotate(0, 0, 5);

Obviously that's REALLY basic and you'd need to tweak the math but shouldn't be too hard to get going.

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POLYGAMe · Jan 29, 2012 at 10:19 PM 0

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Or, you could use Unity's physics... I haven't touched much of that but addforce could do it... would roll the ball for you.

sub0 · Jan 29, 2012 at 10:27 PM 0

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Thanks. But It didn't work. The ball just keeps rotating and going down forever. I want it to roll when I move it like in a terrain.

POLYGAMe · Jan 29, 2012 at 10:34 PM 0

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Like I said, you'd need to tweak it. $$anonymous$$ake variables for speed and rotation (ins$$anonymous$$d of using "magic numbers" and have the rotation match the speed. Then when it's not moving it won't roll.

Varazdt · Jun 28, 2014 at 01:00 PM 0

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I am sorry it is probably to write Get$$anonymous$$ey

Answer 2

Answer by Varazdt · Jun 28, 2014 at 01:00 PM

The right way to roll the ball it is roll ball to the way with your camera will faced...So for this I wrote the code on c# witch will move the ball always in right way,the way witch look your camera..Sooo

public float ballSpeed = 10.0f;

void FixedUpdate(){

 if(input.GetKeyDown(KeyCode.W)){
    this.rigidbody.AddForce(Camera.main.transform.forward * ballSpeed);
 }

  if(input.GetKeyDown(KeyCode.S)){
    this.rigidbody.AddForce(-Camera.main.transform.forward * ballSpeed);
 }

  if(input.GetKeyDown(KeyCode.A)){
    this.rigidbody.AddForce(-Camera.main.transform.right * ballSpeed);
 }

  if(input.GetKeyDown(KeyCode.D)){
    this.rigidbody.AddForce(Camera.main.transform.right * ballSpeed);
 }

}

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Answer 3

Answer by shahar3447 · Sep 28, 2014 at 03:36 PM

add to the sphere a rigid body and use this code:

 public float speed;
     void FixedUpdate (){
 
     float moveHorizontal = Input.GetAxis("Horizontal");
 
     float moveVertical = Input.GetAxis("Vertical");
 
     Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
 
     rigidbody.AddForce(movement * speed * Time.deltaTime);
     }

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How to roll a ball ?

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