In this example, the Fade method doesn’t have the effect you might expect. Coroutine exampleĪs an example, consider the task of gradually reducing an object’s alpha (opacity) value until it becomes invisible: void Fade()įor (float alpha = 1f alpha >= 0 alpha -= 0.1f) It’s best to use coroutines if you need to deal with long asynchronous operations, such as waiting for HTTP transfers, asset loads, or file I/O to complete. If you want to use multi-threaded code within Unity, consider the C# Job System. If you want to reduce the amount of CPU time spent on the main thread, it’s just as important to avoid blocking operations in coroutines as in any other script code. Synchronous operations that run within a coroutine still execute on the main thread. However, it’s important to remember that coroutines aren’t threads. In situations where you would like to use a method call to contain a procedural animation or a sequence of events over time, you can use a coroutine. This means that any action that takes place within a method must happen within a single frame update. In most situations, when you call a method, it runs to completion and then returns control to the calling method, plus any optional return values. In Unity, a coroutine is a method that can pause execution and return control to Unity but then continue where it left off on the following frame. A coroutine allows you to spread tasks across several frames.
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