Dynamic recording of objects position seems fine, playback is too fast.

Question

Im new to unity and im wanting to record the movement of an object so that it can be played back. I have the x,y,z positions recorded but when it comes to replaying the movement it is happening so fast that it gives the impression that the gameobject jumps to the last recorded position instead of actually moving through the recorded positions.

Im stuck as to how i can replay the movement at the same speed as it happened.

my code for this is:

 using UnityEngine;
 using System;
 using System.Collections;
 using System.Collections.Generic;
 
 public class recordv1 : MonoBehaviour {
 
     List<float> nums = new List<float>();
     bool isRec = false;
     bool doPlay = false;
     float tempX;
     float tempY;
     float tempZ;
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
         if( Input.GetKeyDown (KeyCode.R)) {
             if( isRec == false){isRec = true;}
             else{
                 if( isRec == true){isRec = false;}
                 
             }
         }
         
         if( isRec == true){
             tempX = transform.position.x;
             tempY = transform.position.y;
             tempZ = transform.position.z;
             nums.Add(tempX);
             nums.Add(tempY);
             nums.Add(tempZ);
         }
         
         if( Input.GetKeyDown (KeyCode.P)) {
             if( doPlay == false){doPlay = true;}
             else{}
             
         if(doPlay == true){
             
             for (int i = 0; i < nums.Count; i+=3){
                     transform.position = new Vector3(nums[i],nums[i+1],nums[i+2]);
                     
                 }
                 doPlay = false;
                 
             }
         }
         
         
     }
 }

Answer 1

Answer by Statement · Mar 07, 2013 at 04:50 PM

Yeah, you should only update the position once a frame. Not all of them in one frame. I can see two obvious ways you could do it. One is to declare the variable "i" that you use to become a member variable so it remembers where it is between calls. You'd have to make special check to see if you reached the end before you set doPlay to false.

The other is to use a coroutine that processes them each frame. You can wait for the next frame with "yield return null;".

 IEnumerator Playback ()
 {
     for (int i = 0; i < nums.Count; i+=3) {
         transform.position = new Vector3 (nums [i], nums [i + 1], nums [i + 2]);
         yield return null;
     }
 }

To start it, you should call StartCoroutine("Playback");

Add comment · Show 2 · Share

magical · Mar 07, 2013 at 07:54 PM 0

Share

Thanks that makes sense. Although wouldnt this then change the speed the movement is 'played' depending on the computer i.e. one computer may run the game at 30fps while another could be 60fps which would play the movement at double the speed. Or have i misunderstood something.

alexis78963_unity · Apr 29, 2021 at 03:11 PM 0

Share

It's very late but if anyone needs to do this again, you should record the positions in FixedUpdate to not have strange behaviors if some frames drop. Then the coroutine should be:

 yield return new WaitForFixedUpdate();

So that the playback and recording ti$$anonymous$$g matches

Answer 2

Answer by omarcesar · Feb 05, 2016 at 02:40 AM

this plug-in helps record movement of any 3d object, including avatars or complex object with multiple children.. all you do is check one flag. Easy to import and use. check out the demo: https://www.youtube.com/watch?v=Ay-wuj5PvHU

link in asset store; https://www.assetstore.unity3d.com/en/#!/content/17836

Add comment · Share

Dynamic recording of objects position seems fine, playback is too fast.

2 Replies

Your answer

Follow this Question

Related Questions