Basic Networking done

Assets/Mirror/Examples/Tanks/Scripts/Projectile.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.Tanks
+{
+    public class Projectile : NetworkBehaviour
+    {
+        public float destroyAfter = 5;
+        public Rigidbody rigidBody;
+        public float force = 1000;
+
+        public override void OnStartServer()
+        {
+            Invoke(nameof(DestroySelf), destroyAfter);
+        }
+
+        // set velocity for server and client. this way we don't have to sync the
+        // position, because both the server and the client simulate it.
+        void Start()
+        {
+            rigidBody.AddForce(transform.forward * force);
+        }
+
+        // destroy for everyone on the server
+        [Server]
+        void DestroySelf()
+        {
+            NetworkServer.Destroy(gameObject);
+        }
+
+        // ServerCallback because we don't want a warning if OnTriggerEnter is
+        // called on the client
+        [ServerCallback]
+        void OnTriggerEnter(Collider co)
+        {
+            NetworkServer.Destroy(gameObject);
+        }
+    }
+}

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Assets/Mirror/Examples/Tanks/Scripts/Tank.cs

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+using UnityEngine;
+using UnityEngine.AI;
+
+namespace Mirror.Examples.Tanks
+{
+    public class Tank : NetworkBehaviour
+    {
+        [Header("Components")]
+        public NavMeshAgent agent;
+        public Animator animator;
+
+        [Header("Movement")]
+        public float rotationSpeed = 100;
+
+        [Header("Firing")]
+        public KeyCode shootKey = KeyCode.Space;
+        public GameObject projectilePrefab;
+        public Transform projectileMount;
+
+        void Update()
+        {
+            // movement for local player
+            if (!isLocalPlayer) return;
+
+            // rotate
+            float horizontal = Input.GetAxis("Horizontal");
+            transform.Rotate(0, horizontal * rotationSpeed * Time.deltaTime, 0);
+
+            // move
+            float vertical = Input.GetAxis("Vertical");
+            Vector3 forward = transform.TransformDirection(Vector3.forward);
+            agent.velocity = forward * Mathf.Max(vertical, 0) * agent.speed;
+            animator.SetBool("Moving", agent.velocity != Vector3.zero);
+
+            // shoot
+            if (Input.GetKeyDown(shootKey))
+            {
+                CmdFire();
+            }
+        }
+
+        // this is called on the server
+        [Command]
+        void CmdFire()
+        {
+            GameObject projectile = Instantiate(projectilePrefab, projectileMount.position, transform.rotation);
+            NetworkServer.Spawn(projectile);
+            RpcOnFire();
+        }
+
+        // this is called on the tank that fired for all observers
+        [ClientRpc]
+        void RpcOnFire()
+        {
+            animator.SetTrigger("Shoot");
+        }
+    }
+}

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