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Assets/Mirror/Examples/CCU/CCUNetworkManager.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.CCU
+{
+    [AddComponentMenu("")]
+    public class CCUNetworkManager : NetworkManager
+    {
+        [Header("Spawns")]
+        public int spawnAmount = 10_000;
+        public float      interleave = 1;
+        public GameObject spawnPrefab;
+
+        // player spawn positions should be spread across the world.
+        // not all at one place.
+        // but _some_ at the same place.
+        // => deterministic random is ideal
+        [Range(0, 1)] public float spawnPositionRatio = 0.01f;
+
+        System.Random random = new System.Random(42);
+
+        void SpawnAll()
+        {
+            // clear previous player spawn positions in case we start twice
+            foreach (Transform position in startPositions)
+                Destroy(position.gameObject);
+
+            startPositions.Clear();
+
+            // calculate sqrt so we can spawn N * N = Amount
+            float sqrt = Mathf.Sqrt(spawnAmount);
+
+            // calculate spawn xz start positions
+            // based on spawnAmount * distance
+            float offset = -sqrt / 2 * interleave;
+
+            // spawn exactly the amount, not one more.
+            int spawned = 0;
+            for (int spawnX = 0; spawnX < sqrt; ++spawnX)
+            {
+                for (int spawnZ = 0; spawnZ < sqrt; ++spawnZ)
+                {
+                    // spawn exactly the amount, not any more
+                    // (our sqrt method isn't 100% precise)
+                    if (spawned < spawnAmount)
+                    {
+                        // spawn & position
+                        GameObject go = Instantiate(spawnPrefab);
+                        float x = offset + spawnX * interleave;
+                        float z = offset + spawnZ * interleave;
+                        Vector3 position = new Vector3(x, 0, z);
+                        go.transform.position = position;
+
+                        // spawn
+                        NetworkServer.Spawn(go);
+                        ++spawned;
+
+                        // add random spawn position for players.
+                        // don't have them all in the same place.
+                        if (random.NextDouble() <= spawnPositionRatio)
+                        {
+                            GameObject spawnGO = new GameObject("Spawn");
+                            spawnGO.transform.position = position;
+                            spawnGO.AddComponent<NetworkStartPosition>();
+                        }
+                    }
+                }
+            }
+        }
+
+        // overwrite random spawn position selection:
+        // - needs to be deterministic so every CCU test results in the same
+        // - needs to be random so not only are the spawn positions spread out
+        //   randomly, we also have a random amount of players per spawn position
+        public override Transform GetStartPosition()
+        {
+            // first remove any dead transforms
+            startPositions.RemoveAll(t => t == null);
+
+            if (startPositions.Count == 0)
+                return null;
+
+            // pick a random one
+            int index = random.Next(0, startPositions.Count); // DETERMINISTIC
+            return startPositions[index];
+        }
+
+        public override void OnStartServer()
+        {
+            base.OnStartServer();
+            SpawnAll();
+        }
+    }
+}