Ghost Replay For Racing Game

Hello, I have been struggling for awhile now to get my racing replay system to work. I have finally got it storing the positions and rotations to playback, however when I play back the ghost while testing it is too fast. I want to make it go the same speed as the original car but I can not figure out how to do it.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Movement : MonoBehaviour
6. {
7.     public float movementSpeed, rotationSpeed;
8.     public float fbInput, lrInput;
9.  
10.     public List<PointInTime> ghostPointsInTime;
11.  
12.     public bool isReplaying;
13.     public GameObject ghostCar;
14.  
15.     private float nextActionTime = 0.0f;
16.     public float period = 0.5f;
17.  
18.     void Start()
19.     {
20.         movementSpeed = 8.0f;
21.         rotationSpeed = 100.0f;
22.         ghostPointsInTime = new List<PointInTime>();
23.         ghostCar = GameObject.FindGameObjectWithTag("Ghost");
24.     }
25.  
26.     void Update()
27.     {
28.         fbInput = Input.GetAxis("Vertical");
29.         lrInput = Input.GetAxis("Horizontal");
30.         Move();
31.  
32.         if (Input.GetKeyDown(KeyCode.Return))
33.             StartReplay();
34.         if (Input.GetKeyUp(KeyCode.Return))
35.             StopReplay();
36.     }
37.  
38.     public void FixedUpdate()
39.     {
40.         if (isReplaying)
41.             Replay();          
42.         else
43.             RecordMovement();
44.     }
45.  
46.     public void Move()
47.     {
48.         transform.Translate(Vector3.forward * Time.deltaTime * movementSpeed * fbInput);
49.         transform.Rotate(Vector3.up * Time.deltaTime * rotationSpeed * lrInput);
50.        
51.     }
52.  
53.     public void RecordMovement()
54.     {
55.         if (Time.time > nextActionTime)
56.         {
57.             nextActionTime = Time.time + period;
58.             ghostPointsInTime.Add(new PointInTime(transform.position, transform.rotation));
59.             Debug.Log("Recording");
60.         }
61.     }
62.  
63.     public void Replay()
64.     {
65.         if (ghostPointsInTime.Count > 0)
66.         {
67.             PointInTime pointInTime = ghostPointsInTime[0];
68.             ghostCar.transform.position = pointInTime.position;
69.             Debug.Log(pointInTime.position);
70.             ghostCar.transform.rotation = pointInTime.rotation;
71.             Debug.Log(pointInTime.rotation);
72.             ghostPointsInTime.RemoveAt(0);
73.         }
74.  
75.         else
76.         {
77.             StopReplay();
78.         }
79.  
80.     }
81.  
82.     public void StartReplay()
83.     {
84.         isReplaying = true;
85.     }
86.  
87.     public void StopReplay()
88.     {
89.         isReplaying = false;
90.     }
91. }
92.  

 

Time.time

is actually the time since the game booted. I think that's your problem.

You can use

Time.timeSinceLevelLoad

instead but I highly recommend you track your own notion of playback time in a floating point variable, then advance it each frame yourself with :

Code (csharp):

1. myTime += Time.deltaTime;

You probably want to do the same thing time-wise (starting from zero) when you record and when you playback.

Full reference on Unity Time here:

https://docs.unity3d.com/ScriptReference/Time.html

 

Thank you for the response, I will try that out and take a look through the documentation