[SOLVED] Move up gameobject from ground ?

Hi
I'm trying to make an object stay on air and keep his distance from ground. but with my script it just keep going up. for example, I want gameobject to stay up away from ground 20 meter. it should be away from ground 20 meter. How to do that.

Code (CSharp):

1.     public Transform target;
2.     public Rigidbody rb;
3.     public float up_from_hero;
4.  
5.     void Update() {
6.         up_from_hero = gameObject.transform.position.y - target.transform.position.y;
7.         rb.velocity = transform.up * 15 * Time.deltaTime;
8.  
9.     } // end update
10.  
11.     void FixedUpdate() {
12.             RaycastHit hit;
13.         if (Physics.Raycast(transform.position, -Vector3.up, out hit, 200.0f)) {
14.                 print(" distance: " + hit.distance);
15.         }
16.  
17.     }

 

You could turn off gravity in the rigidbody using the editor.

 

Yes, I know, but how to stop it at 20 meter ?

 

Well, you are doing a distance check, so just stop the velocity when the distance equals 20.

 

OK, I do what you said. but it doesn't stop !! I don't know why ?

Code (CSharp):

1.         if (distance <= 5) {
2.             rb.velocity = transform.up * 30 * Time.deltaTime;
3.         }
4.         else {
5.             // stop or do nothing
6.         }
7. //  on fixedupdate distance =  hit.distance
8.  

 

You have to set the velocity back to nothing if you want it to stop.

Code (csharp):

1.         else {           rb.velocity = transform.up * 0 * Time.deltaTime;        }
2.  

 

a simpler way is

Code (csharp):

1.  
2. rb.velocity = transform.zero;
3.  

 

Vector3.zero

 

Yeah, that's it. I'm hopeless without Visual Studio.

 

Great. thank you guys