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Assets/Mirror/Examples/StackedPrediction/NetworkManagerStackedPrediction.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.PredictionBenchmark
+{
+    [AddComponentMenu("")]
+    public class NetworkManagerStackedPrediction : NetworkManager
+    {
+        [Header("Spawns")]
+        public int spawnAmount = 1000;
+        public GameObject spawnPrefab;
+        public float interleave = 1;
+
+        // 500 objects need around 100 iterations to be stable
+        [Tooltip("Stacked Cubes are only stable if solver iterations are high enough!\nDefault is 1, max is 255.")]
+        public int solverIterations = 200;
+        public int solverVelocityIterations = 1;
+
+        public override void Awake()
+        {
+            base.Awake();
+
+            // ensure vsync is disabled for the benchmark, otherwise results are capped
+            QualitySettings.vSyncCount = 0;
+
+            // stacked cubes are only stable if solver iteration is high enough!
+            int before = Physics.defaultSolverIterations;
+            Physics.defaultSolverIterations = solverIterations;
+            Debug.Log($"Physics.defaultSolverIterations: {before} -> {Physics.defaultSolverIterations}");
+
+            before = Physics.defaultSolverVelocityIterations;
+            Physics.defaultSolverVelocityIterations = solverVelocityIterations;
+            Debug.Log($"Physics.defaultSolverVelocityIterations: {before} -> {Physics.defaultSolverVelocityIterations}");
+        }
+
+        void SpawnAll()
+        {
+            // 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 spawnY = 0; spawnY < sqrt; ++spawnY)
+                {
+                    // spawn exactly the amount, not any more
+                    // (our sqrt method isn't 100% precise)
+                    if (spawned < spawnAmount)
+                    {
+                        // it's important to have them at least 'Physics.defaultContactOffset' apart.
+                        // otherwise the physics engine will detect collisions and make them unstable.
+                        float spacing = interleave + Physics.defaultContactOffset;
+                        float x = offset + spawnX * spacing;
+                        float y = spawnY * spacing;
+
+                        // instantiate & position
+                        GameObject go = Instantiate(spawnPrefab);
+                        go.transform.position = new Vector3(x, y, 0);
+
+                        // spawn
+                        NetworkServer.Spawn(go);
+                        ++spawned;
+                    }
+                }
+            }
+        }
+
+        public override void OnStartServer()
+        {
+            base.OnStartServer();
+            SpawnAll();
+
+            // disable rendering on server to reduce noise in profiling.
+            // keep enabled in host mode though.
+            // if (mode == NetworkManagerMode.ServerOnly)
+            //     Camera.main.enabled = false;
+        }
+    }
+}