Add Unity3D projects

year3/semester1/CT3536: Games Programming/project/Assets/NPCCar.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// car controller for the NPC car
+public class NPCCar : MonoBehaviour
+{
+    // wheel transforms and colliders for driving animation
+    public Transform frontLeftWheelTransform;
+    public Transform frontRightWheelTransform;
+    public Transform rearLeftWheelTransform;
+    public Transform rearRightWheelTransform;
+
+    public WheelCollider frontLeftWheelCollider;
+    public WheelCollider frontRightWheelCollider;
+    public WheelCollider rearLeftWheelCollider;
+    public WheelCollider rearRightWheelCollider;
+
+    private int lapCount = 0;
+
+    // array of waypoints for car to navigate track
+    public Transform[] waypoints;
+
+    public float speed = 30f;
+    public float rotationSpeed = 5f;
+
+    private int waypoint = 0;   // next waypoint
+
+    // variables for handling stopping if about to collide with player
+    private Ray ray;            // ray to reuse for raycasting
+    public float maxDistanceToPlayer = 15f;
+
+    void Start() {
+        ray = new Ray();
+    }
+
+    void Update()
+    {
+        if (GameManager.isRaceOn) {
+            if (waypoint < waypoints.Length)
+            {
+                ray.origin = transform.position;
+                ray.direction = transform.TransformDirection(Vector3.forward);
+
+                // only proceed if route is not blocked by player
+                if (Physics.Raycast(ray, out RaycastHit hit, maxDistanceToPlayer)) {
+                    if (!hit.collider.CompareTag("Player")) {
+                        DriveToNextWaypoint();
+                    }
+                    else {
+                        Debug.Log("not proceeding because blocked by player");
+                    }
+                }
+                else {
+                    DriveToNextWaypoint();
+                }
+            }
+            // if all waypoints have been visited, set next waypoint to the 0th one
+            // keep doing circuit until race ends
+            else
+            {
+                waypoint = 0;
+            }
+        }
+    }
+
+    void DriveToNextWaypoint()
+    {
+        // direction to next waypoint
+        Vector3 direction = waypoints[waypoint].position - transform.position;
+        direction.y = 0f;
+
+        // look at next waypoint
+        Quaternion rotation = Quaternion.LookRotation(direction);
+        transform.rotation = Quaternion.Slerp(transform.rotation, rotation, rotationSpeed * Time.deltaTime);
+
+        transform.Translate(Vector3.forward * speed * Time.deltaTime);
+
+        // if within 3m of goal waypoint, move on to next one
+        if (Vector3.Distance(transform.position, waypoints[waypoint].position) < 3f)
+        {
+            waypoint++;
+        }
+
+        // rotate wheels for driving animation
+        Vector3 pos;
+        Quaternion rot;
+
+        frontLeftWheelCollider.GetWorldPose(out pos, out rot);
+        frontLeftWheelTransform.rotation = rot;
+        frontLeftWheelTransform.position = pos;
+
+        frontRightWheelCollider.GetWorldPose(out pos, out rot);
+        frontRightWheelTransform.rotation = rot;
+        frontRightWheelTransform.position = pos;
+
+        rearLeftWheelCollider.GetWorldPose(out pos, out rot);
+        rearLeftWheelTransform.rotation = rot;
+        rearLeftWheelTransform.position = pos;
+
+        rearRightWheelCollider.GetWorldPose(out pos, out rot);
+        rearRightWheelTransform.rotation = rot;
+        rearRightWheelTransform.position = pos;
+    }
+
+    private void OnTriggerEnter(Collider other) {
+        // if collided with finish line
+        if (other.gameObject.CompareTag("FinishLine")) {
+            lapCount++;
+
+            // if completed 3 laps and race is not finished, declare victory
+            if (lapCount > 3 && GameManager.isRaceOn) {
+                GameManager.EndRace("NPC");
+            }
+        }
+    }
+}