AudioListener.volume = Lerp(...) not working correctly!

Questions & Answers
1

Hi,

i already read a few posts about lerping AudioListener to create a global fading of audio.

I have a strange and annoying problem:

void Update()
{
    AudioListener.volume = Mathf.Lerp (AudioListener.volume, 0f, Time.deltaTime);
}

This works just fine, but it fades out immediately of course, and that is not what i want.

So i declare a float to be 0 at a certain condition and just replace the 2nd argument in Mathf.Lerp with that float. Because that is how it works. But it doesn’t work. I get this exact code to work with AudioSources.

This is what i have in my script:

void Update()
{
   if (Input.GetKeyDown(KeyCode.Q)) // Of course this works! Nothing fancy.
   {
      volume2 = 0f;
   }

 AudioListener.volume = Mathf.Lerp (AudioListener.volume, volume2, 2*Time.deltaTime);
}

I test it, and volume2 becomes 0 just as intended but the volume doesn’t fade to zero.
It doesn’t change at all.

I also saw that other people posted this kind of code for AudioListener.volume
But it doesn’t work. Why does it just work when i don’t use any variables??

Maybe it’s an obvious problem, i just sat infront of my pc for 10 hours creating models, code and textures, so forgive me if i don’t get it at the moment.

Please enlighten me. ^^

Thanks.

2

Might be overkill for your usecase, but:

bool fading;
const float totalFadeTime = 1000f;
float currentFadeTime;
float startVolume;

void Update()
{
	if (!fading && Input.GetKeyDown(KeyCode.Q))
	{
		fading = true;
		startVolume = AudioListener.volume;
	}

	if (fading) 
	{
		currentFadeTime += Time.deltaTime;

		if(currentFadeTime > totalFadeTime)
		{
			fading = false;
			currentFadeTime = totalFadeTime;
		}

	    AudioListener.volume = Mathf.Lerp (startVolume, 0, currentFadeTime/totalFadeTime);
	}
3

Hi, thank you guys for your answers and solutions.
I took a nap shortly after writing this question and after a cup of coffee, I thought about how I could find a way to make it work.

I simply created a new script with this:

PS: Yes you can call a boolean “BOOL”. :wink:

public class Test : MonoBehaviour {

	public bool BOOL;
	public float FLOAT1, FLOAT2, FLOAT3;
	// Use this for initialization
	void Start () {
		BOOL = false;
	}
	
	// Update is called once per frame
	void Update () {
	
		if(Input.GetKeyDown(KeyCode.Q))
		{
			FLOAT2 = 0f;
			BOOL = true;
		}
		if(Input.GetKeyDown(KeyCode.E))
		{
			FLOAT2 = 1f;
		}


		AudioListener.volume = Mathf.Lerp (AudioListener.volume, FLOAT2, Time.deltaTime);

		FLOAT3 = AudioListener.volume;
	}
}

As you can see, I don’t make use of the boolean in this example, since it is a simple test.

For now, if I press Q or E, the volume smoothly fades between 0f and 1f!
I assume there was an issue with the float volume2 that i had declared in the “problem”-code.

I have to re-read the class where I had encountered the problem.
Maybe I have two conditions setting volume2 to different values and so it couldn’t change.

But for now I can confirm that Mathf.Lerp(a,b,t) works as intended with AudioListener.volume!

Thank you for taking time to read this!