sphere speaking

Assets/Station46/Environments/Intro Sphere/Scripts/FollowSphere.cs

@@ -1,19 +1,41 @@
-using EscapeRoomEngine.VR.Runtime;
+using System;
+using System.Linq;
+using EscapeRoomEngine.VR.Runtime;
+using NaughtyAttributes;
 using UnityEngine;
 
 namespace Station46.Environments.Intro_Sphere.Scripts
 {
     public class FollowSphere : MonoBehaviour
     {
-        public float minDistance = 0.001f;
-        public float speed = 200;
-        
+        private const int AverageLength = 3;
+        private static readonly int FresnelPower = Shader.PropertyToID("_FresnelPower");
+
+        public float
+            minDistance = 0.001f,
+            speed = 200,
+            sizeFactor = 1,
+            brightnessFactor = 1;
         [SerializeField] private Transform target;
+        [BoxGroup("Internal")] [SerializeField] private AudioSource audioSource;
+        [BoxGroup("Internal")] [SerializeField] private Transform centerTransform;
+        [BoxGroup("Internal")] [SerializeField] private MeshRenderer sphereRenderer;
         
+        private float[] _audioSamples;
+        private float[] _samplesAverage = new float[AverageLength];
+        private int averageIndex;
+        private float _initialBrightness;
+        private Material _sphereMaterial;
         private Rigidbody _rigidbody;
 
         private void Awake()
         {
+            var clip = audioSource.clip;
+            _audioSamples = new float[clip.samples*clip.channels];
+            clip.GetData(_audioSamples, 0);
+
+            _sphereMaterial = sphereRenderer.material;
+            _initialBrightness = _sphereMaterial.GetFloat(FresnelPower);
             _rigidbody = GetComponent<Rigidbody>();
             target = Player.Instance.sphereFollow;
         }
@@ -27,5 +49,21 @@ namespace Station46.Environments.Intro_Sphere.Scripts
                 _rigidbody.AddForce(speed * (followPosition - position));
             }
         }
+
+        private void Update()
+        {
+            if (audioSource.isPlaying)
+            {
+                _samplesAverage[averageIndex] = Mathf.Abs(_audioSamples[audioSource.timeSamples]);
+                averageIndex = (averageIndex + 1) % AverageLength;
+                var average = _samplesAverage.Average();
+                SetCenterSize(1 + sizeFactor * average);
+                SetSphereMaterialBrightness(_initialBrightness - brightnessFactor * average);
+            }
+        }
+
+        private void SetCenterSize(float size) => centerTransform.localScale = new Vector3(size, size, size);
+
+        private void SetSphereMaterialBrightness(float brightness) => _sphereMaterial.SetFloat(FresnelPower, brightness);
     }
 }