I touchs: 12月 2016

2016年12月30日星期五

Unreal: Sound Analysis

since: 2016/12/30
update: 2016/12/30
reference:
1. eXifreXi/eXiSoundVis: UE4 Plugin
2. Plugin eXi's Sound Visualization Plugin
3. BigSoundBank.com - Download sounds in WAV, AIFF, MP3 and OGG

A. 版本
     1. Windows 10
     2. Unreal 4.14.1
     3. Visual Studio 2015 Update 2

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B. 新增專案
    1. New Project > C++ > Basic Code
         > Name: SoundAnalysis > Create Project

    2. 關閉 Unreal > 在 SoundAnalysis 專案目錄內:
        > 刪除 Binaries 目錄
        > 新增 Plugins 目錄

3. 到 eXifreXi/eXiSoundVis: UE4 Plugin下載 eXiSoundVis-master.zip 檔案
解壓縮後更名為 eXiSoundVis 資料夾

4. 將 eXiSoundVis 資料夾 copy 到專案目錄下的 Plugins 目錄內,
並刪除 eXiSoundVis 裡的 Binaries 目錄.

5. 到 BigSoundBank.com 下載.ogg 音效檔 (在此為 0614.ogg)
> copy 到專案目錄下的 Songs 目錄(自行新增)內

6. Unreal 專案名稱 > Generate Visual Studio project files

7. 重新開啟 Unreal 專案:
> Would you like to rebuild them now? > 是(Y)

8. 檢查 Plugin 是否已裝好:

9. 檢查是否能正常編譯

10. 新增 Empty Actor 到場景裡

11. 新增此 Actor 的 Blueprint

12. 取名為: Actor_Blueprint

13. 開啟 Actor_Blueprint, 新增 Sound Vis Component

結果:

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C. 列出專案下的 Songs 目錄內所有的 .ogg 音效檔
1. 新增 Load Sound File Names 節點

2. 結果(目前只有一個 0614.ogg 檔案)

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D. 載入單一音檔(.ogg) 並加入 "載入完成" 的事件
1. Add Load Sound File Node & Assign OnFileLoadCompleted Event

2. 結果:

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(舊方法, 不建議使用)
E. 分析音效頻率
    1. 新增 2 個變數:
        startTime: float , default: 0.0
        duration: float, default: 1.0

    startTime:

duration:

2. Calculate Freq Spectrum 相關節點

3. 結果:

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(新方法, 建議使用)
F. 分析音效頻率
1. 新增 Start Calculate Freq Spectrum 相關節點

2. 產生 OnFrequencySpectrumCalculated Event 節點

3. 新增 Get Freq Value 相關節點:

4. 結果:

2016年12月5日星期一

Unreal: Light Mechanism

since: 2016/12/05
update: 2016/12/14

A. 前置準備
1. 採用 I touchs: Unreal: VR Template 的 A ~ D 步驟, 完成基本專案設置

2. 加入點光源到場景裡:

3. 加入觸發空間到場景裡:

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B. After Game BeginPlay 10 second, Turn Off Light (Set Visibility False)
> Level Blueprint

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C. Trigger Volume: Turn Light On / Off
> Level Blueprint
1. Check Property (default is right)

2. Add On Actor Begin/End Overlap

3. 結果:

4. Trigger Volume: Turn Light On / Off

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D. Turn On Light to Dark (Intensity = 0)

> Level Blueprint

1. add "Set Intensity" node:

2. Turn On Light to Dark

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E. Trigger Volume: Timeline Light Up / Down

> Level Blueprint

1. "Timeline_LightIntensity_Up" Node

2. "Timeline_LightIntensity_Down" Node

3. Trigger Volume: Timeline Light Up / Down

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F. Unreal: OSC Received set Light Intensity

    1. Send from Processing:

import oscP5.*;
import netP5.*;

OscP5 oscP5;
NetAddress myRemoteLocation;

int receivePort = 8001;

// osc target
String sendIP = "127.0.0.1";
int sendPort = 8000;

//@add ######
float myIntensity = 0.0;
float maxIntensity = 5000.0;
boolean isUp = true;

void setup() {
size(400, 400);
frameRate(25);

/* start oscP5, listening for incoming messages */
oscP5 = new OscP5(this, receivePort);

myRemoteLocation = new NetAddress(sendIP, sendPort);
}

void draw() {
background(0);
sendOSC();
}

void sendOSC() {

/* in the following different ways of creating osc messages are shown by example */
OscMessage myMessage = new OscMessage("/position");

/* add an float to the osc message */
myMessage.add(myIntensity);

/* send the message */
oscP5.send(myMessage, myRemoteLocation);

// tune Intensity
// light isUp
if (isUp) {
    if (myIntensity < maxIntensity) {
      myIntensity += 100;
    } else {
      myIntensity = maxIntensity;
      isUp = false;
    }
// light isDown
} else {

    if (myIntensity > 0.0) {
      myIntensity -= 100;
    } else {
      myIntensity = 0.0;
      isUp = true;
    }
}
}

    2. Receieved from Unreal:
     > Level Blueprint

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G. Branch Send OSC:
1. Branch Send OSC:

2. Map Branch Send OSC:

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H. Depending on The Situation, Send OSC
1. float to integer: Truncate