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Question by LeleUnity · Mar 10, 2018 at 11:25 PM · rigidbodytransformrigidbody2dfixedupdatemoveposition

Move a RigidBody with MovePosition up and down

Hello,

I need to Move slowly a RigidBody with MovePosition up and down.


This object that I need to move is child of another object just to let you know it. I am close but it doesn't work. It's 3 days I stucked on this, please help!!

I tried something like this but doesn't work.

 void FixedUpdate() {
          
        float newY = Mathf.Sin(Time.time);
        Vector3 direction =  ((new Vector3(0, Mathf.Abs(newY)* height,1)) -transform.localPosition).normalized;
            r.MovePosition(transform.position + direction * movementSpeed * Time.deltaTime);
         
     }



Could you write a working code for make this work please?

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Answer by Hellium · Mar 11, 2018 at 06:10 PM

Why do you normalize the direction vector?

Try the following code, but I don't know if it will fit your needs:

 private Vector3 initialPosition;
 private Rigidbody r;
 
 void Start()
 {
     r = GetComponent<Rigidbody>();
     initialPosition = r.position;
 }
 
 void FixedUpdate()
 {          
     float newY = Mathf.Sin( Time.time * movementSpeed ) * height;
     Vector3 position = new Vector3( 0, newY, 1 ) - initialPosition ;
     r.MovePosition( position );
 }


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