Trajectory prediction basketball

I need some help to get it right. I did some research and managed to get something done, but it isn't work how it should. I use a second ball to give the basketball force , angle ... aldonaletto script. I have some line renderer working but not how it is supposed to be. So if anyoane can help me that will be great. I have another plane who let me move the invisible ball up and down not only left and right. The prediction won't work in some positions(I get this error:rigidbody.velocity assign attempt for 'ball(Clone)' is not valid. Input velocity is { NaN, NaN, NaN }. UnityEngine.Rigidbody:set_velocity(Vector3) Force:Update() (at Assets/Scripts/Force.cs:98) ) and my ball don't follow the path everytime. If i want to hit the floor and then bounce to the hoop , first it make some sort of an arc then go to the ground and nothing else.

     void Update()
     {
         if(Input.GetKey(KeyCode.Escape))
         {
             Application.LoadLevel(1);
         }
         
         var referenceForward = Vector3.up;
          var referenceRight= Vector3.Cross(Vector3.up, referenceForward);
         var newDirection = ball2.transform.position - playerFire.transform.position;
         var angle = Vector3.Angle(newDirection, referenceForward);
         unghi = angle;
         
 //        Distances = Vector3.Distance(Input.mousePosition, new Vector3(ball2.transform.position.x, ball2.transform.position.y, 0));
         
         if(Input.GetButton ("Fire1"))
         {
             //path simulation
 //            simulatePath();
             mousePoz = new Vector2 (Input.mousePosition.x, Input.mousePosition.y);
             
             if(mousePoz != Vector2.zero)
             {
                 ray = Camera.mainCamera.ScreenPointToRay(mousePoz);
                 
                 if(Physics.Raycast(ray, out hit, Mathf.Infinity))
                 {
                     ball2.transform.position = new Vector3(hit.point.x, hit.point.y, 0);
                 }
             }
         }
         
         if(Input.GetButtonUp("Fire1"))
         {
             rigidbody.useGravity = true;
             rigidbody.velocity = BallisticVel(myTarget, shootAngle);
         }
     }
     
     Vector3 BallisticVel(Transform target, float angle)
     {
         Vector3 direction = transform.position - target.position; // get target direction
         float     height = direction.y; // get height difference
         direction.y = 0; //retain only the horizontal direction;
         float    distance = direction.magnitude; // get horizontal distance;
         float     a = unghi *  Mathf.Deg2Rad; //convert angle to radians;
         direction.y = distance * Mathf.Tan(a); //set direction to the elevation angle;
         distance += height / Mathf.Tan(a); //correct for small height difference
         // calculate the velocity magnitude
         float velocity = Mathf.Sqrt(distance * Physics.gravity.magnitude / Mathf.Sin(2 * a));
         return velocity * direction.normalized;
     }

Here it is my update function and Ballistic. Now the simulation path function :

 //    void simulatePath()
 //    {
 //        Vector3[] segments = new Vector3[segmentCount];
 //        segments[0] = playerFire.transform.position;
 //        Vector3 segVelocity;
 //        
 //        Vector3 direction = transform.position - ball2.transform.position; // get target direction
 //        float     height = direction.y; // get height difference
 //        direction.y = 0; //retain only the horizontal direction;
 //        float    distance = direction.magnitude; // get horizontal distance;
 //        float     a = unghi * Mathf.Deg2Rad; //convert angle to radians;
 //        direction.y = distance * Mathf.Tan(a); //set direction to the elevation angle;
 //        distance += height / Mathf.Tan(a); //correct for small height difference
 //        // calculate the velocity magnitude
 //        float velocity = Mathf.Sqrt(distance * Physics.gravity.magnitude / Mathf.Sin(2 * a));
 //        segVelocity = velocity * direction.normalized;
 //        
 //        for(int i = 1;i < segmentCount; i++)
 //        {
 //            
 //            if(segments[i] != ball2.transform.position)
 //            {
 //                float segTime = (segVelocity.sqrMagnitude != 0) ? segmentScale / segVelocity.magnitude : 0;
 //                segVelocity = segVelocity + Physics.gravity * segTime;
 //                RaycastHit hit;
 //                
 //                if(Physics.Raycast(segments[i-1], segVelocity, out hit, segmentScale))
 //                {
 //                    segments[i] = segments[i-1] + segVelocity.normalized * hit.distance;
 //                    segVelocity = segVelocity - Physics.gravity * (segmentScale - hit.distance) / segVelocity.magnitude;
 //                    segVelocity = Vector3.Reflect(segVelocity, hit.normal);
 //                }
 //                else
 //                {
 //                    segments[i] = segments[i-1] + segVelocity * segTime;
 //                }
 //            }
 //            
 //        }
 //        Color startColor = playerFire.nextColor;
 //        Color endColor = startColor;
 //        startColor.a = 1;
 //        endColor.a = 0;
 //        sightline.SetColors(startColor, endColor);
 //        
 //        sightline.SetVertexCount(segmentCount);
 //        for(int i=0; i < segmentCount; i++)
 //            sightline.SetPosition(i, segments[i]);
 //    }

i use only x and y but the ball after it been launched can bounce anyware

Thanks in advance and sorry for my bad english.