Question Calling Rigidbody.velocity in Server

How to call Rigidbody.velocity in server so that all clients can see it.

 

Can you provide some more details on what you are trying to do?

 

Code (CSharp):

1.  
2. void Update()
3.     {
4.         if (!IsOwner)
5.         {
6.             return;
7.         }
8.  
9.         if (Input.GetButtonDown("Fire1"))
10.         {
11.             FireServerRpc();
12.         }
13.         if (Input.GetButtonUp("Fire1"))
14.        {
15.             StopFireServerRpc();
16.        }
17.     }
18.  
19.     [ServerRpc]
20.     private void StopFireServerRpc()
21.     {
22.         StopCoroutine(firingCorutine);  // IEnumerator firingCorutine = FireContinuously()
23.     }
24.  
25.  
26.     [ServerRpc]
27.     private void FireServerRpc()
28.     {
29.             StartCoroutine(firingCorutine);
30.     }
31.  
32.     IEnumerator FireContinuously()
33.     {
34.         while (true)
35.         {
36.              NetworkObject laser = Instantiate(laserPrefab, transform.position, Quaternion.identity);      
37.  
38.             laser.SpawnWithOwnership(OwnerClientId); // Spawn works fine.
39.  
40.             laser.GetComponent<Rigidbody2D>().velocity = new Vector2(0, projectileSpeed); //This line is the problem.
41.             // This above line works for only host, if host fires every clients can see the host's laser moving,
42. //but if a client fires no other clients nor the host can see the laser moving.
43. // I want to achieve this using rigidbody so as to detect collision and trigger
44.      
45.  
46.             yield return new WaitForSeconds(projectileFiringPeriod);
47.         }
48.     }
49.  
50.  

 

So to make this work you would need to either use a a ClientRPC or a NetworkVariable to set the velocity of your lasers on all clients. I think the easiest way here would be to add a NetworkBehaviour with a velocity NetworkVariable to your laser. Then set that value before you spawn the laser and in `NetworkStart` set the rigidbody's velocity to the value of the NetworkVariable.

 

Tried but doesn't work

Code (CSharp):

1.    
2.  
3. private NetworkVariable<float> laserSpeed = new NetworkVariable<float>(20f);
4.  NetworkObject laser; //cache
5.  
6.  
7.  
8. public override void NetworkStart()
9.     {
10.         laserSpeed.Value = projectileSpeed;
11.     }
12.  
13.     void Update()
14.         {
15.             if (!IsOwner)
16.             {
17.                 return;
18.             }
19.  
20.             if (Input.GetButtonDown("Fire1"))
21.             {
22.                 FireServerRpc();
23.             }
24.             if (Input.GetButtonUp("Fire1"))
25.            {
26.                 StopFireServerRpc();
27.            }
28.         }
29.  
30.         [ServerRpc]
31.         private void StopFireServerRpc()
32.         {
33.             StopCoroutine(firingCorutine);  // IEnumerator firingCorutine = FireContinuously()
34.         }
35.  
36.  
37.         [ServerRpc]
38.         private void FireServerRpc()
39.         {
40.                 StartCoroutine(firingCorutine);
41.         }
42.  
43.         IEnumerator FireContinuously()
44.         {
45.             while (true)
46.             {
47.                 laser = Instantiate(laserPrefab, transform.position, Quaternion.identity);  // 'laser' declared above
48.  
49.                 laser.SpawnWithOwnership(OwnerClientId); // Spawn works fine.  
50.            
51.                 laser.GetComponent<Rigidbody2D>().velocity = new Vector2(0, laserSpeed.Value); // doesn't work
52.              
53.                 // Aslo tried with ClientRpc but doesn't work
54.               // LaserMoveClientRpc();
55.  
56.              
57.      
58.  
59.                 yield return new WaitForSeconds(projectileFiringPeriod);
60.             }
61.         }
62.    
63.  /*[ClientRpc]
64.     private void LaserMoveClientRpc()
65.     {
66.  
67.         laser.GetComponent<Rigidbody2D>().velocity = new Vector2(0, laserSpeed.Value); //laser decalred above
68.        // this above line shows "object reference not set as an intense of an object" when client fire laser
69.  
70.     }*/
71.  
72.  

Will be great if correct code is given for accessing rigidbody.velocity for this case

 

I think this network behaviour is your weapon and not the laser. You want to add a separate Laser network behaviour onto your laser object. Something like:

Code (CSharp):

1. public class Laser : NetworkBehaviour
2. {
3.     public NetworkVariable<float> LaserVelocity = new NetworkVariable<float>(20f);
4.  
5.     public override void NetworkStart()
6.     {
7.         GetComponent<Rigidbody2D>().velocity = new Vector2(0, LaserVelocity.Value);
8.     }
9.  
10. }
11.  

Then put this onto your laser and when you spawn it do:

Code (CSharp):

1.   IEnumerator FireContinuously()
2.         {
3.             while (true)
4.             {
5.                 laser = Instantiate(laserPrefab, transform.position, Quaternion.identity);  // 'laser' declared above
6.  
7.                 laser.GetComponent<Laser>().LaserVelocity.Value = projectileSpeed;
8.  
9.                 laser.SpawnWithOwnership(OwnerClientId); // Spawn works fine.
10.    
11.                 yield return new WaitForSeconds(projectileFiringPeriod);
12.             }
13.         }

 

It works, thanks for the guidance and the knowledge.