最近在研究 3D gltf glb 瀏覽的功能，網路上抓 cdn 有時版本功能不符預期

或是 meshopt draco ktx2 問題造成無法顯示

研究自行編譯 three.js 方法大概如下

git clone https://github.com/mrdoob/three.js.git
cd three.js
git checkout r155

npm install -g rollup
npm install
npm run build

mkdir dist
cp build/three.min.js dist/

# KTX2Loader
npx rollup examples/jsm/loaders/KTX2Loader.js --file dist/KTX2Loader.js --format iife 

# DRACOLoader
npx rollup examples/jsm/loaders/DRACOLoader.js --file dist/DRACOLoader.js --format iife 

# OrbitControls
npx rollup examples/jsm/controls/OrbitControls.js --file dist/OrbitControls.js --format iife 

# GLTFLoader
npx rollup examples/jsm/loaders/GLTFLoader.js --file dist/GLTFLoader.js --format iife 

# MeshoptDecoder
npx rollup examples/jsm/libs/meshopt_decoder.module.js --file dist/meshopt_decoder.js --format iife 

將 libs 拷貝過來
cp examples/jsm/libs dist/ -R

編修
dist/KTX2Loader.js
dist/DRACOLoader.js
dist/OrbitControls.js
dist/GLTFLoader.js

第一行改成
(function (THREE) {

最後幾行改成
    //exports.DRACOLoader = DRACOLoader;
    // 掛到 THREE
   THREE.DRACOLoader = DRACOLoader;
})(THREE);


然後把 three. 全取代成  THREE.

把 dist 搬出去改到 three.js/r155 就可以使用裡面的 cdn 資料，如

    <script src="/inc/javascript/three.js/r155/three.min.js"></script>
    <script src="/inc/javascript/three.js/r155/OrbitControls.js"></script>
    <script src="/inc/javascript/three.js/r155/GLTFLoader.js"></script>        
    <script src="/inc/javascript/three.js/r155/DRACOLoader.js"></script>    
    <script src="/inc/javascript/three.js/r155/KTX2Loader.js"></script>
    <script src="/inc/javascript/three.js/r155/meshopt_decoder.js"></script>