koobas.hobune.stream
How to Invoke() .. one frame
Unityscript ...
I am in routine BB and I want routine CC to run, in the next frame. The elegant solution would look something like..
Invoke( "CC", one frame );
Is there such a thing? If you try Invoke( "CC", 0.00001 ) does that in fact safely mean next frame -- investigation says NO, that does not work. Perhaps some undocumented parameter?
PS I am fully aware you can do this by calling DD where DD is
function DD() { yield; CC(); }
but then that's a coroutine, blah blah. (Come to think of it, I guess you could make a InvokeNextFrame(F:Function){yield;F();} But it's not elegant or builtin.)
Anyway does anyone know the elegant way to "Invoke next frame" ? Thanks a million.
Exactly as my copain below says, in unityscriot, you can test like this:
private var index:int = 0;
function Update()
{
if ( ++index > 10) return;
Debug.Log("runloop "+index);
Invoke("Print",0.00001);
}
function Print()
{ Debug.Log("printer "+index); }
You will see it does not work, not reliably anyway.
By the way, here's a demo that the inelegant "call a caller" function works as far as it goes.
private var index:int = 0;
function Update()
{
if ( ++index>10) return;
Debug.Log("in loop "+index);
INFPrint();
}
function Print()
{Debug.Log("printer "+index);}
function INFPrint() { yield; Print(); }
// INF means Invoke Next Frame
same deal for this InvokeNextFrame(F:Function){yield;F();
Maybe it's really better just to have your own runloop going :-/
OK I run a little test, maybe that will help you out:
public class Test : MonoBehaviour {
int index = 0;
void Update () {
index++;
if(Input.GetKeyDown(KeyCode.Space)){
print (index);
Invoke ("Print",0.0001f);
}
}
void Print(){
print (index);
}
}
As you can see the index is incremented each frame. Running this I can see the printing value are the same inside the Update and in the function invoked.
Now if I change the value from 0.0001f to 1 I see total different values.
Now if I use:
Invoke ("Print",Time.deltaTime);
I see a +1 meaning next frame. Problem is that deltaTime is not really reliable as a constant.
Is that what you needed?
Thanks for spending all the time on this --- right, that's exactly how you would test it. Interestingly in your test you report the "small value trick" DOES NOT work (I've had the opposite result -- actually I just tested it now and like you I found it does not work).
I think Invoking on Time.deltaTime just seems like a horrific idea, I'm sure you agree - it can't possibly work every time.
We just need someone who absolutely knows if there is an undocumented way to do this :-/
Thanks again ...
the deltaTime thingy would fix it in the FixedUpdate but in Update I would not risk it...
no really good solution on this, I've been using this
InvokeNextFrame(F:Function)
{
yield;
F();
}
around. Sometimes you need to StartCoroutine on the F() of course. It's a mess. I can't believe youc an't just schedule next frame. Thanks for the time.
Os see $$anonymous$$ichael's tidy version below
Here is a solution that wont require you to use a coroutine in your current class, just put this in your base class.
public delegate void Function();
public void InvokeNextFrame(Function function)
{
try
{
StartCoroutine(_InvokeNextFrame(function));
}
catch
{
Debug.Log ("Trying to invoke " + function.ToString() + " but it doesnt seem to exist");
}
}
private IEnumerator _InvokeNextFrame(Function function)
{
yield return null;
function();
}
