feat(traffic): add TrafficLane script and vehicle prefabs

Assets/Main.unity

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+  m_EditorClassIdentifier: Assembly-CSharp::TrafficLane
+  routeLength: 60
+  laneCenter: 0
+  vehiclePrefabs:
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+  poolSize: 12
+  baseSpeed: 6
+  speedVariance: 0.05
+  spawnInterval: 0.5
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+  minSpawnGap: 4
+  driftAmplitude: 0.05
+  driftFrequency: 0.08
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Assets/Scripts/Traffic.meta

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Assets/Scripts/Traffic/TrafficLane.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+/// <summary>
+/// Simulates a single lane of traffic by recycling a fixed pool of vehicle GameObjects.
+/// Vehicles travel along local +Z, with organic lateral drift driven by Perlin noise.
+///
+/// Usage:
+///   1. Place this component on an empty GameObject aligned with the road lane.
+///   2. Assign vehicle prefabs, tune speed and drift.
+///   3. Duplicate and mirror-X for the opposite lane.
+/// </summary>
+public class TrafficLane : MonoBehaviour
+{
+    // ── Route ─────────────────────────────────────────────────────────────────
+
+    [Header("Route")]
+    [Tooltip("Length of the lane in local +Z units. Vehicles are recycled at the far end.")]
+    public float routeLength = 80f;
+
+    [Tooltip("Local X position of the lane centre.")]
+    public float laneCenter = 0f;
+
+    // ── Vehicle Pool ──────────────────────────────────────────────────────────
+
+    [Header("Vehicle Pool")]
+    [Tooltip("Prefabs to randomly draw from when spawning. Can contain different vehicle types.")]
+    public GameObject[] vehiclePrefabs;
+
+    [Tooltip("Total number of vehicle instances kept alive at once.")]
+    [Range(1, 60)]
+    public int poolSize = 12;
+
+    // ── Speed ─────────────────────────────────────────────────────────────────
+
+    [Header("Speed")]
+    [Tooltip("Average forward speed in units / second.")]
+    public float baseSpeed = 6f;
+
+    [Tooltip("Per-vehicle speed spread as a fraction of baseSpeed (±).")]
+    [Range(0f, 0.5f)]
+    public float speedVariance = 0.2f;
+
+    // ── Spawn ─────────────────────────────────────────────────────────────────
+
+    [Header("Spawn")]
+    [Tooltip("Average seconds between consecutive spawns.")]
+    public float spawnInterval = 2.5f;
+
+    [Tooltip("Randomisation of spawn interval as a fraction (±).")]
+    [Range(0f, 0.9f)]
+    public float spawnIntervalVariance = 0.4f;
+
+    [Tooltip("Minimum clearance required at Z=0 before the next vehicle may enter.")]
+    public float minSpawnGap = 4f;
+
+    // ── Lateral Drift ─────────────────────────────────────────────────────────
+
+    [Header("Lateral Drift")]
+    [Tooltip("Maximum left / right deviation from lane centre (units).")]
+    public float driftAmplitude = 0.25f;
+
+    [Tooltip("Spatial frequency of the drift wave — lower = longer, lazier curves.")]
+    [Range(0.01f, 1f)]
+    public float driftFrequency = 0.08f;
+
+    // ── Private state ─────────────────────────────────────────────────────────
+
+    private class Agent
+    {
+        public GameObject go;
+        public float progress;    // distance travelled along Z this trip
+        public float speed;       // units / second for this trip
+        public float noiseRow;    // unique Y coordinate in Perlin space for this trip
+        public bool active;
+    }
+
+    private readonly List<Agent> pool = new();
+    private float spawnTimer;
+    private float nextSpawnDelay;
+
+    // ── Lifecycle ─────────────────────────────────────────────────────────────
+
+    private void Start()
+    {
+        if (vehiclePrefabs == null || vehiclePrefabs.Length == 0)
+        {
+            Debug.LogWarning("[TrafficLane] No vehicle prefabs assigned.", this);
+            enabled = false;
+            return;
+        }
+
+        BuildPool();
+        ScheduleNextSpawn();
+
+        // Scatter a few vehicles along the lane so it doesn't look empty at start.
+        PrewarmLane();
+    }
+
+    private void Update()
+    {
+        TickAgents();
+        TickSpawn();
+    }
+
+    // ── Pool construction ─────────────────────────────────────────────────────
+
+    private void BuildPool()
+    {
+        for (var i = 0; i < poolSize; i++)
+        {
+            var prefab = vehiclePrefabs[Random.Range(0, vehiclePrefabs.Length)];
+            var go = Instantiate(prefab, transform);
+            go.SetActive(false);
+            pool.Add(new Agent { go = go, noiseRow = Random.Range(0f, 100f) });
+        }
+    }
+
+    private void PrewarmLane()
+    {
+        // Spread inactive vehicles evenly so the lane looks populated from frame 1.
+        var step = routeLength / Mathf.Max(poolSize * 0.5f, 1f);
+        var z = Random.Range(0f, step);
+        foreach (var agent in pool)
+        {
+            if (z >= routeLength)
+            {
+                break;
+            }
+            Activate(agent, z);
+            z += step * Random.Range(0.7f, 1.3f);
+        }
+    }
+
+    // ── Per-frame tick ────────────────────────────────────────────────────────
+
+    private void TickAgents()
+    {
+        foreach (var agent in pool)
+        {
+            if (!agent.active)
+            {
+                continue;
+            }
+
+            agent.progress += agent.speed * Time.deltaTime;
+
+            if (agent.progress >= routeLength)
+            {
+                Deactivate(agent);
+                continue;
+            }
+
+            // Perlin noise: x-axis = position along route, y-axis = per-agent seed.
+            var noise = Mathf.PerlinNoise(agent.progress * driftFrequency, agent.noiseRow);
+            var lateral = laneCenter + (noise * 2f - 1f) * driftAmplitude;
+
+            var prev = agent.go.transform.localPosition;
+            var next = new Vector3(lateral, 0f, agent.progress);
+            agent.go.transform.localPosition = next;
+
+            // Face direction of travel, ignoring tiny sub-frame deltas.
+            var delta = next - prev;
+            if (delta.sqrMagnitude > 1e-6f)
+            {
+                agent.go.transform.localRotation = Quaternion.LookRotation(delta, Vector3.up);
+            }
+        }
+    }
+
+    private void TickSpawn()
+    {
+        spawnTimer += Time.deltaTime;
+        if (spawnTimer < nextSpawnDelay)
+        {
+            return;
+        }
+
+        spawnTimer = 0f;
+        ScheduleNextSpawn();
+
+        // Block spawn if another vehicle is still near the entry point.
+        foreach (var agent in pool)
+        {
+            if (agent.active && agent.progress < minSpawnGap)
+            {
+                return;
+            }
+        }
+
+        SpawnNext(0f);
+    }
+
+    // ── Helpers ───────────────────────────────────────────────────────────────
+
+    private void Activate(Agent agent, float startProgress)
+    {
+        agent.progress = startProgress;
+        agent.speed = baseSpeed * (1f + Random.Range(-speedVariance, speedVariance));
+        agent.noiseRow = Random.Range(0f, 100f);
+        agent.go.SetActive(true);
+        agent.active = true;
+
+        // Teleport silently to start position before enabling.
+        var noise = Mathf.PerlinNoise(startProgress * driftFrequency, agent.noiseRow);
+        var lateral = laneCenter + (noise * 2f - 1f) * driftAmplitude;
+        agent.go.transform.localPosition = new Vector3(lateral, 0f, startProgress);
+    }
+
+    private void SpawnNext(float startProgress)
+    {
+        foreach (var agent in pool)
+        {
+            if (!agent.active)
+            {
+                Activate(agent, startProgress);
+                return;
+            }
+        }
+        // Pool exhausted — skip this cycle.
+    }
+
+    private static void Deactivate(Agent agent)
+    {
+        agent.go.SetActive(false);
+        agent.active = false;
+    }
+
+    private void ScheduleNextSpawn()
+    {
+        var variance = spawnInterval * spawnIntervalVariance;
+        nextSpawnDelay = Mathf.Max(0.1f, spawnInterval + Random.Range(-variance, variance));
+    }
+
+    // ── Editor visualisation ──────────────────────────────────────────────────
+
+#if UNITY_EDITOR
+    private void OnDrawGizmosSelected()
+    {
+        var start = transform.TransformPoint(new Vector3(laneCenter, 0f, 0f));
+        var end   = transform.TransformPoint(new Vector3(laneCenter, 0f, routeLength));
+
+        Gizmos.color = Color.yellow;
+        Gizmos.DrawLine(start, end);
+
+        // Drift envelope.
+        Gizmos.color = new Color(1f, 1f, 0f, 0.25f);
+        var left  = transform.TransformPoint(new Vector3(laneCenter - driftAmplitude, 0f, 0f));
+        var right = transform.TransformPoint(new Vector3(laneCenter + driftAmplitude, 0f, 0f));
+        var leftEnd  = transform.TransformPoint(new Vector3(laneCenter - driftAmplitude, 0f, routeLength));
+        var rightEnd = transform.TransformPoint(new Vector3(laneCenter + driftAmplitude, 0f, routeLength));
+        Gizmos.DrawLine(left, leftEnd);
+        Gizmos.DrawLine(right, rightEnd);
+        Gizmos.DrawLine(left, right);
+        Gizmos.DrawLine(leftEnd, rightEnd);
+
+        // Entry / exit markers.
+        Gizmos.color = Color.green;
+        Gizmos.DrawSphere(start, 0.3f);
+        Gizmos.color = Color.red;
+        Gizmos.DrawSphere(end, 0.3f);
+    }
+#endif
+}

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