Merge pull request #11 from JohnSWigner/ai_racer

add AI racer, race manager, checkpoint, finish line, respawn mechanis…

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+--- !u!114 &8956791611276861029
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Assets/Prefabs/RaceObjects/RaceManager.prefab.meta

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Assets/Scenes/AITrack.unity.meta

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Assets/Scenes/Menu.unity

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+  scene_to_load: AITrack
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 --- !u!1 &1397774624
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Assets/Scenes/TestTrack.unity.meta

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Assets/Scripts/Kart/AIHovercarController.cs

@@ -0,0 +1,322 @@
+using UnityEngine;
+
+public class AIHovercarController : MonoBehaviour
+{
+    [Header("Hover Settings")]
+    public float hoverHeight = 3.0f;
+    public float positionAdjustmentSpeed = 10.0f;
+    public float raycastDistance = 10.0f;
+    public LayerMask terrainLayer;
+
+    [Header("Movement Settings")]
+    public float movementSpeed = 10.0f;  // Max speed
+    public float acceleration = 5.0f;    // How quickly to accelerate
+    public float deceleration = 7.0f;    // How quickly to decelerate
+    public float rotationSpeed = 100.0f;
+
+    [Header("Checkpoint Navigation")]
+    [Tooltip("Ordered list of checkpoints for the AI to follow.")]
+    public Transform[] checkpoints;
+    [Tooltip("Distance from a checkpoint at which the AI switches to the next one.")]
+    public float checkpointThreshold = 5.0f;
+    private int currentCheckpointIndex = 0;
+
+    [Header("Random Steering Settings")]
+    [Tooltip("Probability per second that a random steering offset is applied (0 = never, 1 = every second on average).")]
+    public float randomSteeringProbability = 0.2f;
+    [Tooltip("Maximum random steering offset added (in normalized input units; e.g., 0.2 means up to ±20% extra steering).")]
+    public float randomSteeringMaxOffset = 0.2f;
+
+    [Header("Slowdown Settings")]
+    [Tooltip("Distance before a checkpoint at which the AI begins to slow down.")]
+    public float slowdownDistance = 10f;
+    [Tooltip("Strength of the slowdown (0 = no slowdown, 1 = full slowdown to minimum throttle at the checkpoint).")]
+    public float slowdownStrength = 0.5f;
+
+    [Header("Reset Settings")]
+    [Tooltip("Time (in seconds) without track contact before resetting the vehicle.")]
+    public float timeBeforeReset = 3.0f;
+
+    [Header("Track Orientation Settings")]
+    [Tooltip("Distance to search downward for track (used to align the vehicle’s bottom).")]
+    public float trackRaycastDistance = 10.0f;
+    [Tooltip("Tag used on the track geometry.")]
+    public string trackTag = "Track";
+
+    [Header("Avoidance Settings")]
+    [Tooltip("Radius within which the AI will try to avoid other racers.")]
+    public float avoidanceRadius = 5.0f;
+    [Tooltip("Strength of the steering adjustment to avoid collisions.")]
+    public float avoidanceSteeringStrength = 0.5f;
+    [Tooltip("Throttle multiplier applied when avoiding other racers (0 to 1, where lower means more slowdown).")]
+    public float avoidanceSlowdownMultiplier = 0.5f;
+    [Tooltip("Tag used to identify other racers for avoidance.")]
+    public string racerTag = "Racer";
+
+    private float currentSpeed = 0.0f;
+    private Rigidbody rb;
+
+    // Timer for lost ground/track contact
+    private float noContactTimer = 0.0f;
+    // Flag indicating if the hover raycast hit the terrain/track this physics frame
+    private bool groundContact = false;
+
+    void Start()
+    {
+        rb = GetComponent<Rigidbody>();
+        rb.useGravity = false;
+    }
+
+    void FixedUpdate()
+    {
+        HandleHovering();
+        HandleMovement();
+
+        // If no ground/track contact is detected, count up the timer.
+        if (!groundContact)
+        {
+            noContactTimer += Time.fixedDeltaTime;
+            if (noContactTimer >= timeBeforeReset)
+            {
+                ResetToCheckpoint();
+                noContactTimer = 0.0f; // Reset timer after repositioning.
+            }
+        }
+        else
+        {
+            // Reset the timer when ground/track contact is re-established.
+            noContactTimer = 0.0f;
+        }
+    }
+
+    /// <summary>
+    /// Hover logic: cast a ray downward, interpolate the hit point and normal on the terrain,
+    /// and adjust the vehicle's position and rotation so it hovers along the track.
+    /// Also sets the groundContact flag for reset timing.
+    /// </summary>
+    void HandleHovering()
+    {
+        RaycastHit hit;
+        Vector3 rayOrigin = transform.position;
+
+        if (Physics.Raycast(rayOrigin, -transform.up, out hit, raycastDistance, terrainLayer))
+        {
+            groundContact = true;
+
+            Mesh mesh = hit.collider.GetComponent<MeshFilter>().mesh;
+            int triangleIndex = hit.triangleIndex;
+            int vertex1Index = mesh.triangles[triangleIndex * 3 + 0];
+            int vertex2Index = mesh.triangles[triangleIndex * 3 + 1];
+            int vertex3Index = mesh.triangles[triangleIndex * 3 + 2];
+
+            Vector3 worldVertex1 = hit.collider.transform.TransformPoint(mesh.vertices[vertex1Index]);
+            Vector3 worldVertex2 = hit.collider.transform.TransformPoint(mesh.vertices[vertex2Index]);
+            Vector3 worldVertex3 = hit.collider.transform.TransformPoint(mesh.vertices[vertex3Index]);
+
+            Vector3 interpolatedPoint = worldVertex1 * hit.barycentricCoordinate.x +
+                                        worldVertex2 * hit.barycentricCoordinate.y +
+                                        worldVertex3 * hit.barycentricCoordinate.z;
+
+            Vector3 localNormal1 = mesh.normals[vertex1Index];
+            Vector3 localNormal2 = mesh.normals[vertex2Index];
+            Vector3 localNormal3 = mesh.normals[vertex3Index];
+            Vector3 worldNormal1 = hit.collider.transform.TransformDirection(localNormal1);
+            Vector3 worldNormal2 = hit.collider.transform.TransformDirection(localNormal2);
+            Vector3 worldNormal3 = hit.collider.transform.TransformDirection(localNormal3);
+            Vector3 interpolatedNormal = worldNormal1 * hit.barycentricCoordinate.x +
+                                         worldNormal2 * hit.barycentricCoordinate.y +
+                                         worldNormal3 * hit.barycentricCoordinate.z;
+            interpolatedNormal.Normalize();
+
+            Vector3 targetPosition = interpolatedPoint + interpolatedNormal * hoverHeight;
+            transform.position = Vector3.Lerp(transform.position, targetPosition, Time.fixedDeltaTime * positionAdjustmentSpeed);
+
+            Quaternion targetRotation = Quaternion.FromToRotation(transform.up, interpolatedNormal) * transform.rotation;
+            rb.rotation = Quaternion.Slerp(rb.rotation, targetRotation, Time.fixedDeltaTime * 5.0f);
+        }
+        else
+        {
+            groundContact = false;
+        }
+    }
+
+    /// <summary>
+    /// Simulates input by computing throttle and steering based on the AI's orientation relative to the next checkpoint.
+    /// New additions:
+    /// - Random steering offset.
+    /// - Throttle reduction when turning sharply and when approaching a checkpoint.
+    /// - Avoidance: steer away from and slow down for nearby racers.
+    /// </summary>
+    void HandleMovement()
+    {
+        // Default simulated inputs.
+        float verticalInput = 1f; // full throttle by default
+        float horizontalInput = 0f;
+
+        if (checkpoints != null && checkpoints.Length > 0)
+        {
+            Transform targetCheckpoint = checkpoints[currentCheckpointIndex];
+            Vector3 toCheckpoint = targetCheckpoint.position - transform.position;
+            float distanceToCheckpoint = toCheckpoint.magnitude;
+            Vector3 toCheckpointNormalized = toCheckpoint.normalized;
+
+            // If the target checkpoint is behind the vehicle, switch to the next one immediately.
+            if (Vector3.Dot(transform.forward, toCheckpointNormalized) < 0)
+            {
+                currentCheckpointIndex = (currentCheckpointIndex + 1) % checkpoints.Length;
+            }
+            else
+            {
+                // Compute steering input based on the angle between the vehicle's forward and the direction to the checkpoint.
+                Vector3 projectedForward = Vector3.ProjectOnPlane(transform.forward, transform.up).normalized;
+                Vector3 projectedTarget = Vector3.ProjectOnPlane(toCheckpointNormalized, transform.up).normalized;
+                float angle = Vector3.SignedAngle(projectedForward, projectedTarget, transform.up);
+                horizontalInput = Mathf.Clamp(angle / 45f, -1f, 1f);
+
+                // Add a random steering offset occasionally.
+                if (Random.value < randomSteeringProbability * Time.fixedDeltaTime)
+                {
+                    float randomOffset = Random.Range(-randomSteeringMaxOffset, randomSteeringMaxOffset);
+                    horizontalInput += randomOffset;
+                    horizontalInput = Mathf.Clamp(horizontalInput, -1f, 1f);
+                }
+
+                // Reduce throttle when turning sharply.
+                verticalInput = Mathf.Clamp(1f - (Mathf.Abs(horizontalInput) * 0.5f), 0f, 1f);
+
+                // Additional slowdown when approaching a checkpoint.
+                if (distanceToCheckpoint < slowdownDistance)
+                {
+                    float slowdownFactor = Mathf.Lerp(1 - slowdownStrength, 1f, distanceToCheckpoint / slowdownDistance);
+                    verticalInput *= slowdownFactor;
+                }
+
+                // Switch to the next checkpoint when close enough.
+                if (distanceToCheckpoint < checkpointThreshold)
+                {
+                    currentCheckpointIndex = (currentCheckpointIndex + 1) % checkpoints.Length;
+                }
+            }
+        }
+
+        // --- Avoidance Logic ---
+        // Look for nearby racers and, if any are detected, adjust steering and throttle.
+        Collider[] nearbyColliders = Physics.OverlapSphere(transform.position, avoidanceRadius);
+        Vector3 avoidanceVector = Vector3.zero;
+        int avoidanceCount = 0;
+        foreach (Collider col in nearbyColliders)
+        {
+            if (col.gameObject != gameObject && col.CompareTag(racerTag))
+            {
+                Vector3 diff = transform.position - col.transform.position;
+                if (diff.magnitude > 0)
+                {
+                    // Closer objects contribute more.
+                    avoidanceVector += diff.normalized / diff.magnitude;
+                    avoidanceCount++;
+                }
+            }
+        }
+        if (avoidanceCount > 0)
+        {
+            avoidanceVector /= avoidanceCount;
+            // Project onto the horizontal plane.
+            avoidanceVector = Vector3.ProjectOnPlane(avoidanceVector, transform.up).normalized;
+            // Determine steering adjustment from avoidance.
+            float avoidanceAngle = Vector3.SignedAngle(transform.forward, avoidanceVector, transform.up);
+            float avoidanceInput = Mathf.Clamp(avoidanceAngle / 45f, -1f, 1f) * avoidanceSteeringStrength;
+            horizontalInput += avoidanceInput;
+            horizontalInput = Mathf.Clamp(horizontalInput, -1f, 1f);
+            // Slow down throttle when avoiding.
+            verticalInput *= avoidanceSlowdownMultiplier;
+        }
+        // --- End Avoidance Logic ---
+
+        // Apply movement: accelerate/decelerate toward the target speed, then update velocity and angular velocity.
+        float targetSpeed = verticalInput * movementSpeed;
+        if (verticalInput != 0)
+        {
+            currentSpeed = Mathf.Lerp(currentSpeed, targetSpeed, Time.fixedDeltaTime * acceleration);
+        }
+        else
+        {
+            currentSpeed = Mathf.Lerp(currentSpeed, 0, Time.fixedDeltaTime * deceleration);
+        }
+
+        rb.linearVelocity = transform.forward * currentSpeed;
+        float turn = horizontalInput * rotationSpeed;
+        rb.angularVelocity = transform.up * turn * Mathf.Deg2Rad;
+    }
+
+    /// <summary>
+    /// Resets the AI's position to the last checkpoint it passed and reorients it so that:
+    /// - Its front faces toward the nearest (other) checkpoint.
+    /// - Its bottom is aligned with the nearby track surface (determined via a raycast and track tag).
+    /// </summary>
+    void ResetToCheckpoint()
+    {
+        if (checkpoints == null || checkpoints.Length == 0)
+        {
+            Debug.LogWarning("No checkpoints assigned in the Inspector.");
+            return;
+        }
+
+        // Determine the last checkpoint passed.
+        int lastCheckpointIndex = currentCheckpointIndex - 1;
+        if (lastCheckpointIndex < 0)
+        {
+            lastCheckpointIndex = checkpoints.Length - 1;
+        }
+        Transform lastCheckpoint = checkpoints[lastCheckpointIndex];
+
+        // Find the nearest other checkpoint (to set the forward direction).
+        Transform nearestOther = null;
+        float nearestDistance = Mathf.Infinity;
+        foreach (Transform cp in checkpoints)
+        {
+            if (cp == lastCheckpoint)
+                continue;
+            float d = Vector3.Distance(lastCheckpoint.position, cp.position);
+            if (d < nearestDistance)
+            {
+                nearestDistance = d;
+                nearestOther = cp;
+            }
+        }
+
+        // Determine desired forward direction.
+        Vector3 desiredForward = (nearestOther != null)
+            ? (nearestOther.position - lastCheckpoint.position).normalized
+            : transform.forward;
+
+        // Determine the track’s surface normal to align the vehicle’s bottom.
+        // Raycast downward from a point just above the checkpoint.
+        Vector3 desiredUp = Vector3.up; // Fallback
+        RaycastHit hit;
+        Vector3 rayOrigin = lastCheckpoint.position + Vector3.up * 1.0f;
+        if (Physics.Raycast(rayOrigin, -Vector3.up, out hit, trackRaycastDistance))
+        {
+            if (hit.collider.CompareTag(trackTag))
+            {
+                // Use the inverted hit normal so the vehicle’s bottom (–transform.up) is flush with the track.
+                desiredUp = -hit.normal;
+            }
+        }
+
+        // Adjust desired forward so that it is perpendicular to desired up.
+        desiredForward = Vector3.ProjectOnPlane(desiredForward, desiredUp).normalized;
+
+        Quaternion desiredRotation = Quaternion.LookRotation(desiredForward, desiredUp);
+
+        // Reset position and orientation.
+        transform.position = lastCheckpoint.position;
+        transform.rotation = desiredRotation;
+
+        // Clear any existing motion.
+        rb.linearVelocity = Vector3.zero;
+        rb.angularVelocity = Vector3.zero;
+
+        Debug.Log("AI reset to checkpoint: " + lastCheckpoint.name +
+                  (nearestOther != null ? " with front facing: " + nearestOther.name : ""));
+    }
+}

Assets/Scripts/Kart/AIHovercarController.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: c250747ddb036f14faf25789ceb28a34

Assets/Scripts/Kart/ArcadeKart.cs

@@ -1,86 +0,0 @@
-using System;
-using UnityEngine;
-using System.Collections.Generic;
-using UnityEngine.VFX;
-
-namespace SRL
-{
-    public class ArcadeKart : MonoBehaviour
-    {
-
-        public InputData Input     { get; private set; }
-        // the input sources that can control the kart
-        IInput[] m_Inputs;
-
-        void GatherInputs()
-        {
-            // reset input
-            Input = new InputData();
-
-            // gather nonzero input from our sources
-            for (int i = 0; i < m_Inputs.Length; i++)
-            {
-                Input = m_Inputs[i].GenerateInput();
-            }
-        }
-
-
-
-        [Header("Hover Settings")]
-        public float hoverHeight = 2.0f;
-        public float hoverForce = 100f;
-        public LayerMask groundLayer;
-        public float hoverDampening = 5f;
-
-        [Header("Movement Settings")]
-        public float forwardSpeed = 50f;
-        public float turnSpeed = 20f;
-        public float strafeSpeed = 15f;
-        public float drag = 2f;
-
-
-        private Rigidbody rb;
-
-        void Awake()
-        {
-            rb = GetComponent<Rigidbody>();
-            m_Inputs = GetComponents<IInput>();
-        }
-
-        void FixedUpdate()
-        {
-            GatherInputs();
-            Hover();
-            Move();
-        }
-
-        void Hover()
-        {
-            // Raycast to ground to simulate hover
-            Ray ray = new Ray(transform.position, -transform.up);
-            if (Physics.Raycast(ray, out RaycastHit hit, hoverHeight * 2, groundLayer))
-            {
-                float hoverError = hoverHeight - hit.distance;
-                float upwardSpeed = rb.linearVelocity.y;
-                float appliedHoverForce = hoverError * hoverForce - upwardSpeed * hoverDampening;
-
-                rb.AddForce(Vector3.up * appliedHoverForce, ForceMode.Acceleration);
-            }
-        }
-
-        void Move()
-        {
-            // Forward movement
-            float forwardInput = Input.Accelerate ? 1f : 0f;
-            Vector3 forwardForce = transform.forward * forwardInput * forwardSpeed;
-            rb.AddForce(forwardForce, ForceMode.Acceleration);
-
-            // Turning (rotate around Y-axis)
-            float turnInput = Input.TurnInput;
-            rb.AddTorque(Vector3.up * turnInput * turnSpeed, ForceMode.Acceleration);
-
-            // Apply drag to reduce endless acceleration
-            rb.linearVelocity = Vector3.Lerp(rb.linearVelocity, Vector3.zero, drag * Time.fixedDeltaTime);
-        }
-    }
-}

Assets/Scripts/Kart/ArcadeKart.cs.meta

@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: 438e8be3307824743b12d4e4f02825ea

Assets/Scripts/Kart/BankingObject.cs.meta

@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: 592688461ab994244b969670c11efe3f

Assets/Scripts/Kart/BaseInput.cs

@@ -1,24 +0,0 @@
-using UnityEngine;
-
-namespace SRL
-{
-    public struct InputData
-    {
-        public bool Accelerate;
-        public bool Brake;
-        public float TurnInput;
-    }
-
-    public interface IInput
-    {
-        InputData GenerateInput();
-    }
-
-    public abstract class BaseInput : MonoBehaviour, IInput
-    {
-        /// <summary>
-        /// Override this function to generate an XY input that can be used to steer and control the car.
-        /// </summary>
-        public abstract InputData GenerateInput();
-    }
-}

Assets/Scripts/Kart/BaseInput.cs.meta

@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: 4dbe12014e130b54daf317a2e6be5b65

Assets/Scripts/Kart/HovercarController.cs

@@ -2,29 +2,71 @@ using UnityEngine;
 
 public class StableHovercarController : MonoBehaviour
 {
+    [Header("Hover Settings")]
     public float hoverHeight = 3.0f;
     public float positionAdjustmentSpeed = 10.0f;
     public float raycastDistance = 10.0f;
     public LayerMask terrainLayer;
 
+    [Header("Movement Settings")]
     public float movementSpeed = 10.0f;  // Max speed
     public float acceleration = 5.0f;    // How quickly to accelerate
     public float deceleration = 7.0f;    // How quickly to decelerate
     public float rotationSpeed = 100.0f;
 
-    private float currentSpeed = 0.0f;   // Speed that interpolates over time
+    [Header("Reset Settings")]
+    [Tooltip("Time (in seconds) without track contact before resetting the vehicle.")]
+    public float timeBeforeReset = 3.0f;
+    // Checkpoints are used to reposition the vehicle.
+    public Transform[] checkpoints;
+
+    [Header("Track Orientation Settings")]
+    [Tooltip("Distance to search downward for track (used to align the vehicle’s bottom).")]
+    public float trackRaycastDistance = 10.0f;
+    [Tooltip("Tag used on the track geometry.")]
+    public string trackTag = "Track";
+
+    private float currentSpeed = 0.0f;
     private Rigidbody rb;
+    private RacerProgress racerProgress;
+
+    // Timer for how long the raycast has failed to hit ground/track
+    private float noContactTimer = 0.0f;
+    // Flag that indicates whether a raycast hit was detected in this physics update.
+    private bool groundContact = false;
 
     void Start()
     {
         rb = GetComponent<Rigidbody>();
-        rb.useGravity = false;  // Disable gravity for stability
+        rb.useGravity = false; // Disable gravity for hover stability
+
+        racerProgress = GetComponent<RacerProgress>();
+        if (racerProgress == null)
+        {
+            Debug.LogWarning("No RacerProgress component found on this vehicle!");
+        }
     }
 
     void FixedUpdate()
     {
         HandleHovering();
         HandleMovement();
+
+        // If we aren’t detecting ground/track contact, count up.
+        if (!groundContact)
+        {
+            noContactTimer += Time.fixedDeltaTime;
+            if (noContactTimer >= timeBeforeReset)
+            {
+                ResetToCheckpoint();
+                noContactTimer = 0.0f; // Reset timer after repositioning
+            }
+        }
+        else
+        {
+            // Reset the timer when ground/track is detected.
+            noContactTimer = 0.0f;
+        }
     }
 
     void HandleHovering()
@@ -32,23 +74,30 @@ public class StableHovercarController : MonoBehaviour
         RaycastHit hit;
         Vector3 rayOrigin = transform.position;
 
-        // Cast a ray downward to detect the terrain
+        // Cast a ray downward to detect the terrain (or track geometry).
         if (Physics.Raycast(rayOrigin, -transform.up, out hit, raycastDistance, terrainLayer))
         {
+            // We have ground contact.
+            groundContact = true;
+
+            // Determine the triangle on the mesh that was hit.
             Mesh mesh = hit.collider.GetComponent<MeshFilter>().mesh;
             int triangleIndex = hit.triangleIndex;
             int vertex1Index = mesh.triangles[triangleIndex * 3 + 0];
             int vertex2Index = mesh.triangles[triangleIndex * 3 + 1];
             int vertex3Index = mesh.triangles[triangleIndex * 3 + 2];
 
+            // Convert the triangle vertices to world space.
             Vector3 worldVertex1 = hit.collider.transform.TransformPoint(mesh.vertices[vertex1Index]);
             Vector3 worldVertex2 = hit.collider.transform.TransformPoint(mesh.vertices[vertex2Index]);
             Vector3 worldVertex3 = hit.collider.transform.TransformPoint(mesh.vertices[vertex3Index]);
 
+            // Interpolate to find the hit point on the triangle.
             Vector3 interpolatedPoint = worldVertex1 * hit.barycentricCoordinate.x +
                                         worldVertex2 * hit.barycentricCoordinate.y +
                                         worldVertex3 * hit.barycentricCoordinate.z;
 
+            // Similarly, interpolate the normals.
             Vector3 localNormal1 = mesh.normals[vertex1Index];
             Vector3 localNormal2 = mesh.normals[vertex2Index];
             Vector3 localNormal3 = mesh.normals[vertex3Index];
@@ -60,37 +109,128 @@ public class StableHovercarController : MonoBehaviour
                                          worldNormal3 * hit.barycentricCoordinate.z;
             interpolatedNormal.Normalize();
 
+            // Compute the target hover position.
             Vector3 targetPosition = interpolatedPoint + interpolatedNormal * hoverHeight;
-
             transform.position = Vector3.Lerp(transform.position, targetPosition, Time.fixedDeltaTime * positionAdjustmentSpeed);
 
+            // Smoothly rotate the vehicle to align with the terrain.
             Quaternion targetRotation = Quaternion.FromToRotation(transform.up, interpolatedNormal) * transform.rotation;
             rb.rotation = Quaternion.Slerp(rb.rotation, targetRotation, Time.fixedDeltaTime * 5.0f);
         }
+        else
+        {
+            // No ground detected.
+            groundContact = false;
+        }
     }
 
     void HandleMovement()
     {
-        // Get player input
+        // Get player input.
         float input = Input.GetAxis("Vertical");
 
-        // Determine target speed based on input
+        // Calculate target speed.
         float targetSpeed = input * movementSpeed;
 
+        // Smooth acceleration/deceleration.
         if (input != 0)
         {
-            // Smooth acceleration
             currentSpeed = Mathf.Lerp(currentSpeed, targetSpeed, Time.fixedDeltaTime * acceleration);
         }
         else
         {
-            // Smooth deceleration when no input is present
             currentSpeed = Mathf.Lerp(currentSpeed, 0, Time.fixedDeltaTime * deceleration);
         }
 
-        // Apply movement and rotation
+        // Apply forward movement.
         rb.linearVelocity = transform.forward * currentSpeed;
+
+        // Apply rotation.
         float turn = Input.GetAxis("Horizontal") * rotationSpeed;
         rb.angularVelocity = transform.up * turn * Mathf.Deg2Rad;
     }
+
+    /// <summary>
+    /// Resets the vehicle’s position to the last checkpoint reached (from RacerProgress) and orients it so that:
+    /// - Its front faces the nearest (other) checkpoint.
+    /// - Its bottom is aligned to the track (using a raycast and the specified track tag).
+    /// </summary>
+    void ResetToCheckpoint()
+    {
+        // Make sure we have checkpoints.
+        if (checkpoints == null || checkpoints.Length == 0)
+        {
+            Debug.LogWarning("No checkpoints have been assigned in the Inspector.");
+            return;
+        }
+        if (racerProgress == null)
+        {
+            Debug.LogWarning("RacerProgress component is missing. Cannot reset to checkpoint.");
+            return;
+        }
+        int cpIndex = racerProgress.currentCheckpointIndex;
+        if (cpIndex < 0 || cpIndex >= checkpoints.Length)
+        {
+            Debug.LogWarning("Invalid checkpoint index in RacerProgress!");
+            return;
+        }
+
+        // Position: use the checkpoint that the racer last reached.
+        Transform lastCheckpoint = checkpoints[cpIndex];
+
+        // Find the "other" checkpoint nearest to the last checkpoint.
+        // (This will be used to determine the forward direction.)
+        Transform nearestOther = null;
+        float nearestDistance = Mathf.Infinity;
+        foreach (Transform cp in checkpoints)
+        {
+            if (cp == lastCheckpoint)
+                continue;
+            float d = Vector3.Distance(lastCheckpoint.position, cp.position);
+            if (d < nearestDistance)
+            {
+                nearestDistance = d;
+                nearestOther = cp;
+            }
+        }
+
+        // Determine desired forward:
+        // If we found another checkpoint, aim toward it.
+        // (Project the vector onto the plane defined by the desired up.)
+        Vector3 desiredForward = (nearestOther != null)
+            ? (nearestOther.position - lastCheckpoint.position).normalized
+            : transform.forward;
+
+        // Determine the track’s surface normal so we can align the vehicle’s bottom.
+        // We cast a ray downward from a point just above the checkpoint.
+        Vector3 desiredUp = Vector3.up; // Fallback if no track is detected.
+        RaycastHit hit;
+        Vector3 rayOrigin = lastCheckpoint.position + Vector3.up * 1.0f;
+        if (Physics.Raycast(rayOrigin, -Vector3.up, out hit, trackRaycastDistance))
+        {
+            if (hit.collider.CompareTag(trackTag))
+            {
+                // To have the vehicle’s bottom (–transform.up) flush with the track,
+                // we set our desired up vector to be the inverse of the track’s normal.
+                desiredUp = -hit.normal;
+            }
+        }
+
+        // Now adjust the desired forward so that it is perpendicular to the desired up.
+        desiredForward = Vector3.ProjectOnPlane(desiredForward, desiredUp).normalized;
+
+        // Build the final rotation.
+        Quaternion desiredRotation = Quaternion.LookRotation(desiredForward, desiredUp);
+
+        // Reset position and orientation.
+        transform.position = lastCheckpoint.position;
+        transform.rotation = desiredRotation;
+
+        // Clear any existing motion.
+        rb.linearVelocity = Vector3.zero;
+        rb.angularVelocity = Vector3.zero;
+
+        Debug.Log("Vehicle reset to checkpoint: " + lastCheckpoint.name +
+                  (nearestOther != null ? " with front facing: " + nearestOther.name : ""));
+    }
 }

Assets/Scripts/Kart/KeyboardInput.cs

@@ -1,20 +0,0 @@
-using UnityEngine;
-
-namespace SRL {
-
-    public class KeyboardInput : BaseInput
-    {
-        public string TurnInputName = "Horizontal";
-        public string AccelerateButtonName = "Accelerate";
-        public string BrakeButtonName = "Brake";
-
-        public override InputData GenerateInput() {
-            return new InputData
-            {
-                Accelerate = Input.GetButton(AccelerateButtonName),
-                Brake = Input.GetButton(BrakeButtonName),
-                TurnInput = Input.GetAxis("Horizontal")
-            };
-        }
-    }
-}

Assets/Scripts/Kart/KeyboardInput.cs.meta

@@ -1,2 +0,0 @@
-fileFormatVersion: 2
-guid: de1851cd35e729f4aa33011a49cd59fb

Assets/Scripts/Kart/ObjectBanking.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: f060abec37829be48a8165282e7c3aeb

Assets/Scripts/RaceGameManager.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 33bad5ae96b211b4ba79fa289a4eb6b9
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/RaceGameManager/Checkpoint.cs

@@ -0,0 +1,24 @@
+using UnityEngine;
+
+public class Checkpoint : MonoBehaviour
+{
+    [Tooltip("The order index of this checkpoint along the track.")]
+    public int checkpointIndex = 0;
+
+    private void OnTriggerEnter(Collider other)
+    {
+        RacerProgress progress = other.GetComponent<RacerProgress>();
+        if (progress != null && RaceManager.Instance != null)
+        {
+            // Only update if the racer is expecting this checkpoint next.
+            if (progress.currentCheckpointIndex == checkpointIndex)
+            {
+                int totalCheckpoints = RaceManager.Instance.numberOfCheckpoints;
+                progress.currentCheckpointIndex = (checkpointIndex + 1) % totalCheckpoints;
+                // If the racer just passed the final checkpoint, increment the lap count.
+                if (checkpointIndex == totalCheckpoints - 1)
+                    progress.lapCount++;
+            }
+        }
+    }
+}

Assets/Scripts/RaceGameManager/Checkpoint.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 7c3aaa50cd9e11d49801b7daff0a21bf

Assets/Scripts/RaceGameManager/FinishLine.cs

@@ -0,0 +1,13 @@
+using UnityEngine;
+
+public class FinishLine : MonoBehaviour
+{
+    private void OnTriggerEnter(Collider other)
+    {
+        RacerProgress progress = other.GetComponent<RacerProgress>();
+        if (progress != null && RaceManager.Instance != null)
+        {
+            RaceManager.Instance.CheckFinish(progress);
+        }
+    }
+}

Assets/Scripts/RaceGameManager/FinishLine.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 9a4bc101ca357064ca138761e1319354

Assets/Scripts/RaceGameManager/RaceManager.cs

@@ -0,0 +1,72 @@
+using UnityEngine;
+using System.Collections.Generic;
+
+public class RaceManager : MonoBehaviour
+{
+    public static RaceManager Instance;
+
+    [Header("Race Settings")]
+    [Tooltip("Total number of laps needed to finish the race.")]
+    public int totalLaps = 3;
+    [Tooltip("Total number of checkpoints in the race.")]
+    public int numberOfCheckpoints = 0; // Set this in the Inspector to match your track setup
+
+    [Header("Finish Line Settings")]
+    [Tooltip("Assign the finish line object (with a trigger collider) here.")]
+    public Transform finishLine;
+
+    private List<RacerProgress> racers = new List<RacerProgress>();
+    public bool raceFinished = false;
+    public string winnerName = "";
+
+    void Awake()
+    {
+        // Basic singleton setup.
+        if (Instance == null)
+            Instance = this;
+        else
+            Destroy(gameObject);
+    }
+
+    void Start()
+    {
+        // Optionally, automatically find all racers by tag.
+        GameObject[] racerObjects = GameObject.FindGameObjectsWithTag("Racer");
+        foreach (GameObject racer in racerObjects)
+        {
+            RacerProgress progress = racer.GetComponent<RacerProgress>();
+            if (progress != null)
+                racers.Add(progress);
+        }
+    }
+
+    /// <summary>
+    /// Returns the highest “progress value” among all racers.
+    /// (Calculated as: lap count * numberOfCheckpoints + current checkpoint index.)
+    /// </summary>
+    public float GetLeaderProgress()
+    {
+        float leaderProgress = 0f;
+        foreach (RacerProgress rp in racers)
+        {
+            float progressValue = rp.lapCount * numberOfCheckpoints + rp.currentCheckpointIndex;
+            if (progressValue > leaderProgress)
+                leaderProgress = progressValue;
+        }
+        return leaderProgress;
+    }
+
+    /// <summary>
+    /// Call this when a racer crosses the finish line.
+    /// </summary>
+    public void CheckFinish(RacerProgress rp)
+    {
+        if (rp.lapCount >= totalLaps && !raceFinished)
+        {
+            raceFinished = true;
+            winnerName = rp.gameObject.name;
+            Debug.Log("Race Finished! Winner: " + winnerName);
+            // Here you might trigger UI updates, stop all racers, etc.
+        }
+    }
+}

Assets/Scripts/RaceGameManager/RaceManager.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 18ac36268412d1946a31d8945cc6ac33

Assets/Scripts/RaceGameManager/RacerProgress.cs

@@ -0,0 +1,9 @@
+using UnityEngine;
+
+public class RacerProgress : MonoBehaviour
+{
+    // The checkpoint index the racer is currently aiming for.
+    public int currentCheckpointIndex = 0;
+    // The current lap count.
+    public int lapCount = 0;
+}

Assets/Scripts/RaceGameManager/RacerProgress.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 80f1410edd2d20447b553914aa3c9c7f

ProjectSettings/EditorBuildSettings.asset

@@ -11,9 +11,12 @@ EditorBuildSettings:
   - enabled: 0
     path: Assets/Scenes/SampleScene.unity
     guid: 99c9720ab356a0642a771bea13969a05
-  - enabled: 1
+  - enabled: 0
-    path: Assets/Scenes/TestTrack.unity
+    path: Assets/Scenes/TestTrackWithAI.unity
     guid: 933d22bf6aedba544849d3821a5d3a91
+  - enabled: 1
+    path: Assets/Scenes/AITrack.unity
+    guid: 79f34c11850512b418ac4060394f87ce
   m_configObjects:
     com.unity.input.settings.actions: {fileID: -944628639613478452, guid: 052faaac586de48259a63d0c4782560b, type: 3}
   m_UseUCBPForAssetBundles: 0

ProjectSettings/TagManager.asset

@@ -3,7 +3,9 @@
 --- !u!78 &1
 TagManager:
   serializedVersion: 3
-  tags: []
+  tags:
+  - Racer
+  - Track
   layers:
   - Default
   - TransparentFX