koobas.hobune.stream
How to move along a group of waypoints at a certain speed?
I am trying to write code that records a players position as it moves, and when a key is pressed instantiates a copy that moves along the same path at the same speed. I have managed to make it work apart from moving at the same speed. when i press the key the character moves along the points to the current location in a fraction of a second. I have tried many variations but here is one version of the code:
var playerGO; var wayPoints = new Array (Vector3(0,0,0)); var playerLookAlike : Transform; private var playerLookAlike1: Transform;
function Start(){ playerGO = GameObject.FindWithTag("Player"); }
function Update () {
wayPoints.Add(playerGO.transform.position);
if (Input.GetKeyDown("z")){
playerLookAlike1 = Instantiate(playerLookAlike, Vector3(0,1.315133,0), playerLookAlike.rotation);
for (i = 1; i < wayPoints.length; i++){
playerLookAlike1.transform.position = Vector3.Lerp(wayPoints[i-1], wayPoints[i], 0.7);
print (playerLookAlike1.transform.position);
}
}
} can anyone tell me how i can slow down the playerLookAlike so that is moves at the same speed that the player moved at?
issue 1
function Update () {
wayPoints.Add(playerGO.transform.position);
this is unusable data. Update() is called each frame rendered. it can be 300 frames per second or 3. so you will get 300 points or 3 - what will you do with all of them? wich time all points should play? and remember, that FPS is not a constant.
solution 1
store position in fixed time intervals. for example, each 0.1 second. code should look like:
//store time when we will store position
float timeOfNextCheckpoint;
//executes once at start
void Start()
{
//initialize/reset time
timeOfNextCheckpoint = Time.time;
}
//executes every frame
void Update()
{
//check if it's time to store position
if (Time.time >= timeOfNextCheckpoint)
{
//store position
wayPoints.Add(playerGO.transform.position);
//and calculate time for next storing
timeOfNextCheckpoint += 0.1f;
}
}
issue 2
Update() is method that called once a frame. it must contains some simple work that you need EVERY frame. in your task you need to make a long-time operation, so you can only start it in Update, but not make it all. your code makes move through all points in one frame.
solution 2
void Update ()
{
if (Input.GetKeyDown("z"))
{
playerLookAlike1 = Instantiate(playerLookAlike, Vector3(0,1.315133,0), playerLookAlike.rotation);
//start a long operation
StartCoroutine(ReplayCoroutine());
}
}
IEnumerator ReplayCoroutine()
{
for (i = 1; i < wayPoints.length; i++){
playerLookAlike1.transform.position = Vector3.Lerp(wayPoints[i-1], wayPoints[i], 0.7);
print (playerLookAlike1.transform.position);
//make a pause 0.1 sec
yield return new WaitForSeconds(0.1f);
}
}
thanks a lot! i tried putting in the yield but it hadn't occurred to me to slow down the amount of coordinates being added to the way points variable. again thanks a lot!
Wondering if iTween (http://itween.pixelplacement.com) could be used here.
You're changing the position in only one frame (one call to Update). You need to use a coroutine and yield between each change of position.
And your recording is also wrong because you have no idea how much time passed between each recorded waypoint. You could either use a coroutine with fixed time sample or record the deltaTime in a separate list.
