Unity+FMOD+GVR插件移动端VR场景FMOD事件音量淡出实现求助

Hey there! I get that coding isn't your strong suit, so I've put together two simple, actionable ways to get that 10-15 second volume fade-out for your specific FMOD event when your scene wraps up—perfect for your Galaxy S8 VR prototype using Unity, FMOD, and GVR (Resonance Audio).

Since you mentioned GVR bypasses FMOD's group buses, we'll focus on controlling the individual event's volume directly (this won't conflict with GVR's spatialization control).

Option 1: No-Code/Low-Code with FMOD Studio + Unity Animator #

This is the most straightforward if you want to avoid writing much code:

1. Set up the fade parameter in FMOD Studio

   • Open your target FMOD event
   • Go to the Parameters tab, click Add Parameter, name it Fade, set its range from 0 to 1
   • Switch to the Mix tab, select the main volume slider for your event
   • Right-click the slider and choose Automate Parameter > Fade
   • Edit the automation curve so:
     • When Fade = 0, volume is at your normal level (e.g., 0dB / 1.0)
     • When Fade = 1, volume drops to -∞dB / 0.0
   • Save and build your FMOD banks, then import them back into Unity

2. Trigger the fade in Unity with Animator

   • Create a new Animation Clip (right-click in Project window > Animation > Animation)
   • Open the Animation window, select a GameObject that has a StudioEventEmitter component linked to your FMOD event
   • Add the StudioEventEmitter > Parameters > Fade property to the animation
   • Set the animation duration to 10-15 seconds
   • Keyframe the Fade value at 0 at the start of the clip, and 1 at the end
   • Attach an Animator component to the GameObject, assign the Animation Clip to a state
   • When your scene is about to end (e.g., on a button press or scene load trigger), call animator.Play("YourFadeAnimation")—you can even do this with Unity's UI Event System without writing code!

Option 2: Simple Copy-Paste C# Script #

If you're okay with using a tiny bit of code (just copy and paste), this method gives you direct control in Unity:

Create a new C# script named FadeOutOnSceneEnd, paste this code:

using UnityEngine;
using FMODUnity;
using UnityEngine.SceneManagement;
using System.Collections;

public class FadeOutOnSceneEnd : MonoBehaviour
{
    // Drag your target FMOD event here in the Inspector
    public EventReference targetFmodEvent;
    // Set your fade duration (10-15 seconds)
    public float fadeDuration = 12f;

    private StudioEventEmitter eventEmitter;
    private float originalVolume;

    void Start()
    {
        // Get or add the StudioEventEmitter component
        eventEmitter = GetComponent<StudioEventEmitter>() ?? gameObject.AddComponent<StudioEventEmitter>();
        eventEmitter.EventReference = targetFmodEvent;
        originalVolume = eventEmitter.Volume;

        // Listen for when the scene is unloaded
        SceneManager.sceneUnloaded += StartFadeOut;
    }

    void StartFadeOut(Scene unusedScene)
    {
        StartCoroutine(FadeOutCoroutine());
    }

    IEnumerator FadeOutCoroutine()
    {
        float elapsedTime = 0f;
        while (elapsedTime < fadeDuration)
        {
            // Linear fade from original volume to 0
            float currentVolume = originalVolume * (1 - (elapsedTime / fadeDuration));
            eventEmitter.Volume = currentVolume;
            
            elapsedTime += Time.deltaTime;
            yield return null;
        }

        // Stop the event cleanly after fade
        eventEmitter.Stop();
        // Clean up the listener to avoid memory leaks
        SceneManager.sceneUnloaded -= StartFadeOut;
    }
}

How to use this script: #

• Attach it to any GameObject in your scene that won't be destroyed early (like a persistent manager object)
• In the Inspector, drag your target FMOD event into the Target Fmod Event field
• Set Fade Duration to your desired time (10-15 seconds)
• That's it! When the scene unloads, the event will fade out automatically.

Note for code-triggered events: #

If you're starting your FMOD event via code instead of using StudioEventEmitter, modify the script slightly to use an EventInstance instead:

// Replace the top variables and Start() with this:
private FMOD.Studio.EventInstance eventInstance;

void Start()
{
    eventInstance = RuntimeManager.CreateInstance(targetFmodEvent);
    eventInstance.start();
    SceneManager.sceneUnloaded += StartFadeOut;
}

// Update the coroutine:
IEnumerator FadeOutCoroutine()
{
    float elapsedTime = 0f;
    float originalVolume = 1f; // Default FMOD volume is 1.0

    while (elapsedTime < fadeDuration)
    {
        float currentVolume = originalVolume * (1 - (elapsedTime / fadeDuration));
        eventInstance.setVolume(currentVolume);
        
        elapsedTime += Time.deltaTime;
        yield return null;
    }

    eventInstance.stop(FMOD.Studio.STOP_MODE.ALLOW_FADE_OUT);
    eventInstance.release();
    SceneManager.sceneUnloaded -= StartFadeOut;
}

Both methods work around GVR's bus bypass because we're controlling the individual event's volume directly, not relying on FMOD's group buses. Pick whichever feels more comfortable for your workflow!

内容的提问来源于stack exchange，提问作者Guillaume Lavrilleux