enable to change color from FFT

Author: valbeat

Assets/Material/shockwave.mat

@@ -0,0 +1,100 @@
+using UnityEngine;
+using System.Collections;
+
+// 空のAudio Sourceをアタッチ
+[RequireComponent (typeof (AudioSource))]
+public class MicAnalyzer : MonoBehaviour {
+	// 現在の音量を読み取る
+	public float GetLoundness() {
+		return loudness;
+	}
+	// 感度
+	public float sensitivity = 100;
+	// 音量
+	float loudness;
+	// 前フレームの音量
+	float lastLoudness;
+
+	// レンジでコントロールできるようにする
+	[Range(0,0.95f)]
+	public float lastLoudnessInfluence;
+
+	private AudioSource audio;
+
+	// マテリアル
+	private Material mat;
+
+	public int resolution = 1024;
+	public float lowFreqThreshold = 14700, midFreqThreshold = 29400, highFreqThreshold = 44100;
+	public float lowEnhance = 1f, midEnhance = 10f, highEnhance = 100f;
+
+	// Use this for initialization
+	void Start () {
+		// マテリアルの作成
+		mat = GetComponent<Renderer>().material;
+		// 空のAudio Sourceを取得
+		audio = GetComponent<AudioSource>();
+		// Audio Source の Audio Clipをマイク入力に設定
+		audio.clip = Microphone.Start(null, true, 10, 44100);
+
+		// 無音状態でずっと再生しておく
+		audio.loop = true;
+		audio.mute = true;
+
+		// マイクがReady状態になるまで待機
+		while (Microphone.GetPosition(null) <= 0) {}
+		// 再生開始
+		audio.Play();
+	}
+
+	// Update is called once per frame
+	void Update () {
+		CalcLoudness();
+		AnalyzeSpectrum();
+	}
+	// 現フレームの音量を計算
+	void CalcLoudness() {
+		lastLoudness = loudness;
+		loudness = GetAveragedVolume() * sensitivity * (1 - lastLoudnessInfluence ) + lastLoudness * lastLoudnessInfluence;
+
+		// ボリューム
+		mat.SetFloat("_Loudness", loudness);
+	}
+	// 現フレームのAudioClipから平均的な音量を取得
+	float GetAveragedVolume() {
+		int sampleData = 256;
+		float[] data = new float[sampleData];
+		float _audio = 0;
+		GetComponent<AudioSource>().GetOutputData(data, 0);
+		foreach( float d in data) {
+			_audio += Mathf.Abs(d);
+		}
+		return _audio / sampleData;
+	}
+	void AnalyzeSpectrum() {
+		var spectrum = audio.GetSpectrumData(resolution, 0, FFTWindow.BlackmanHarris);
+		var deltaFreq = AudioSettings.outputSampleRate / resolution;
+		float low = 0f, mid = 0f, high = 0f;
+
+		for (var i = 0; i < resolution; ++i) {
+			var freq = deltaFreq * i;
+			if (freq <= lowFreqThreshold) {
+				low += spectrum[i];
+			}
+			else if (freq <= midFreqThreshold) {
+				mid += spectrum[i];
+			}
+			else if (freq <= highFreqThreshold) {
+				high += spectrum[i];
+			}
+		}
+
+		low  *= lowEnhance;
+		mid  *= midEnhance;
+		high *= highEnhance;
+		// ボリューム
+		mat.SetFloat("_LowSpectrum", low);
+		mat.SetFloat("_MidSpectrum", mid);
+		mat.SetFloat("_HighSpectrum", high);
+	}
+}

Assets/Script/MicAnalyzer.cs

@@ -18,13 +18,13 @@
 			float4 color : COLOR;
 		};
 		// Propertiesで指定した値を取得
-		float _WaveNum, _WaveScale, _Opacity, _Loudness;
+		float _WaveNum, _WaveScale, _Opacity, _Loudness,
+		      _LowSpectrum, _MidSpectrum, _HighSpectrum;
 		float4 _Color;
+
 		//
 		void surf (Input IN, inout SurfaceOutput o) {
-			// 反射の割合 青と緑は半分反射
-			o.Albedo = _Color.rgb;
-			o.Albedo = float4((_SinTime.x+1.0) * 2, (_SinTime.y+1.0) * 2, (_SinTime.z) * 2, 0.1);
+			o.Albedo = float4(_LowSpectrum, _MidSpectrum, _HighSpectrum, 0.1);
 			// 半透明
 			o.Alpha = _Opacity;
 		}