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Exercise - Enable and disable spatialization at run time

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In this module, you'll learn how to Enable and disable spatialization at run time and test this in the unity editor and HoloLens 2.

Add spatialization control script

1. Right-click in the Project window and choose Create > C# Script to create a new C# script, enter a suitable name for the script, for example, SpatializeOnOff:

   

2. Double-click the script in the Project window to open it in Visual Studio. Replace the default script contents with the following:

   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   using UnityEngine.Audio;
   
   [RequireComponent(typeof(AudioSource))]
   public class SpatializeOnOff : MonoBehaviour
   {
       public GameObject ButtonTextObject;
       //public AudioMixerGroup RoomEffectGroup;
       //public AudioMixerGroup MasterGroup;
   
       private AudioSource m_SourceObject;
       private bool m_IsSpatialized;
       private TMPro.TextMeshPro m_TextMeshPro;
   
       public void Start()
       {
           m_SourceObject = gameObject.GetComponent<AudioSource>();
           m_TextMeshPro = ButtonTextObject.GetComponent<TMPro.TextMeshPro>();
           SetSpatialized();
       }
   
       public void SwapSpatialization()
       {
           if (m_IsSpatialized)
           {
               SetStereo();
           }
           else
           {
               SetSpatialized();
           }
       }
   
       private void SetSpatialized()
       {
           m_IsSpatialized = true;
           m_SourceObject.spatialBlend = 1;
           m_TextMeshPro.SetText("Set Stereo");
           //m_SourceObject.outputAudioMixerGroup = RoomEffectGroup;
       }
   
       private void SetStereo()
       {
           m_IsSpatialized = false;
           m_SourceObject.spatialBlend = 0;
           m_TextMeshPro.SetText("Set Spatialized");
           //m_SourceObject.outputAudioMixerGroup = MasterGroup;
       }
   }
   

   Note

   To enable or disable the spatialization, the script only adjusts the spatialBlend property, leaving the spatialization property enabled. In this mode, Unity still applies the Volume curve. Otherwise, if the user were to disable spatialization when far from the source, they would hear the volume increase abruptly. If you prefer to fully disable spatialization, modify the script to also adjust the spatialization boolean property of the SourceObject variable.

Attach your script and drive it from the button

1. Select Quad in the Hierarchy and in the Inspector window, use the Add Component button to add SpatializeOnOff(Script)

   

2. In the Hierarchy locate PressableButtonHoloLens2 > IconAndText > TextMeshPro.

3. With the Quad object still selected in the Hierarchy, in the Inspector window, locate the Spatialize On Off (Script) component and Drag and drop TextMeshPro Component of the PressableButtonHoloLens2.

   

4. To set the button to call the SpatializeOnOff script when the button is released You need to configure interactable script.

5. In the Hierarchy window, select the PressableButtonHoloLens2. In the Inspector window, locate the Interactable (Script) component and click on + icon under OnClick () event.

   1. With the PressableButtonHoloLens2 object still selected in the Hierarchy window, click-and-drag the Quad object from the Hierarchy window into the empty None (Object) field of the event you just added to make the ButtonParent object listen for button click event from this button:

   2. Click the No Function dropdown of the same event. Then select SpatializeOnOff > SwapSpatialization () to turn on and off the Spatial audio

   

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