Game Development Stack Exchange is a question and answer site for professional and independent game developers. It only takes a minute to sign up.
Sign up to join this community
So I'm trying to make a camera zoom in, but Thread.Sleep doesn't work.
Here is the code:
void Start() {
for (int a = 0; a > 1000; a = a + 1)
{
Debug.Log("Done!");
Thread.Sleep(100);
}
}
The error code is this:
Assets\StartScene\CamScript.cs(12,13): error CS0103: The name 'Thread' does not exist in the current context
You are getting this error message because you are missing a line that accesses the API for this. Simply add using System.Threading; at the top of your script. This will access the API for it. Or use a coroutine, which won’t freeze the entire game as a whole and is a much better alternative, as DMGregory suggested.
using System.Threading; will remove the compiler error, but replace it with a stall, where the game as a whole freezes for a tenth of a second. Not exactly ideal in this context.
\$\endgroup\$
You want a Coroutine.
// IEnumerator tells Unity to run this as a coroutine
// that can suspend and wait, without stalling the whole game.
IEnumerator Start() {
// Your loop condition was backwards,
// so it would never execute the body.
// It looks like you want a < here instead.
for (int a = 0; a < 1000; a++)
{
Debug.Log("Done!");
// yield return means "suspend this method"
// and the WaitForSeconds tells us when to resume it.
yield return new WaitForSeconds(0.1f);
}
}
An important thing to understand about Unity is that the MonoBehaviour message methods like Start() and Update() are called on the main thread (ie. single-threaded). So if you stall one of them by hitting a long-running loop or sleeping the thread, you cause the entire game to hang.
So, if you want to add a delay, it needs to be by yielding control back to the engine temporarily - so it can continue running other update functions, accepting input, rendering frames, etc. - until you are ready to resume your work.
