如何实现依赖FixedUpdate的物体每X秒周期性启停闪烁？

Hey Daniel, let's solve this periodic blink cycle problem you're dealing with for your image modulation feature. Since your core blink logic already works great in FixedUpdate and InvokeRepeating doesn't fit your needs, here's a reliable time-tracking approach that stays synced with your frame-based logic:

Step-by-Step Implementation #

First, declare a few state variables to track the cycle timing and active state:

• cycleDuration: Your X value (the length of each on/off phase)
• elapsedTime: Tracks time passed since the last state toggle
• isBlinkingActive: Toggles whether your blink logic runs each frame

Then integrate this into your FixedUpdate loop:

public class ImageModulationController : MonoBehaviour
{
    // Assign your desired X value in the Inspector
    [SerializeField] private float cycleDuration = 1.5f;
    
    private float elapsedTime = 0f;
    private bool isBlinkingActive = true;

    private void FixedUpdate()
    {
        // Accumulate time using fixedDeltaTime to stay in sync with FixedUpdate
        elapsedTime += Time.fixedDeltaTime;

        // Check if we've completed one full cycle phase
        if (elapsedTime >= cycleDuration)
        {
            // Flip the active state (blinking <-> off)
            isBlinkingActive = !isBlinkingActive;
            // Reset the timer (subtract instead of setting to 0 to avoid small time gaps)
            elapsedTime -= cycleDuration;
        }

        // Only execute your existing blink logic when active
        if (isBlinkingActive)
        {
            // Your pre-tested core blink/image modulation logic goes here
            ExecuteImageModulation();
        }
    }

    // Replace this with your existing working blink logic
    private void ExecuteImageModulation()
    {
        // Example: Adjust material properties, toggle pixel states, etc.
        // ... your existing code here ...
    }
}

Why This Works for Your Use Case #

• Syncs with FixedUpdate: Since your image modulation logic relies on FixedUpdate, this approach ensures the cycle timing stays aligned with your frame-based operations, avoiding desync issues that InvokeRepeating might introduce.
• Precise Cycle Control: Using Time.fixedDeltaTime ensures consistent timing even if frame rates fluctuate, which is critical for image modulation tasks that require accurate periodicity.
• Easy to Adjust: Just tweak cycleDuration in the Inspector to change your X value without modifying core logic.

If you need ultra-precise timing (to avoid tiny floating-point errors over long cycles), you could also track the number of FixedUpdate cycles instead of elapsed time—just calculate how many fixed frames equal X seconds (frameCountTarget = Mathf.RoundToInt(cycleDuration / Time.fixedDeltaTime)), then increment a counter each frame and toggle when it hits the target.

内容的提问来源于stack exchange，提问作者Daniel