Sketchfab Model Downloader

Download Sketchfab models
目前為 2025-05-03 提交的版本，檢視最新版本。
安裝腳本 ?
Wrap lines
// ==UserScript==
// @name         Sketchfab Model Downloader
// @version      1.1
// @description  Download Sketchfab models
// @author       ncikkis
// @include      /^https?:\/\/(www\.)?sketchfab\.com\/.*/
// @require      https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.5/jszip.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/jszip-utils/0.0.2/jszip-utils.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.8/FileSaver.js
// @run-at       document-start
// @grant        unsafeWindow
// @namespace https://gf.qytechs.cn/users/1465318
// ==/UserScript==

(function(){
  'use strict';
  const window = unsafeWindow;

  if (typeof saveAs === 'function') window.saveAs = saveAs;

  const rDrawGeom    = /(this\._stateCache\.drawGeometry\(this\._graphicContext,t\))/g;
  const rDrawArrays  = /t\.drawArrays\(t\.TRIANGLES,0,6\)/g;
  const rRend1       = /A\.renderInto\(n,E,R/g;
  const rRend2       = /g\.renderInto=function\(e,i,r/g;
  const rGetResImg   = /getResourceImage:function\(e,t\){/g;

  let zip, folder, objects, cache, buttonInjected;
  window.allmodel = [];

  function reset() {
    zip = new JSZip();
    folder = zip.folder('collection');
    objects = {};
    cache = {};
    console.log('[Downloader] state reset');
  }

  function tryInsertButton(){
    console.log('[Downloader] trying to insert button…');
    const sel = document.querySelector('.model-header__actions')
              || document.querySelector('.model-actions')
              || document.querySelector('.titlebar');
    if(sel && !buttonInjected){
      const a = document.createElement('a');
      a.className = 'control';
      a.innerHTML = `<pre style="
        background:#e74c3c;color:#fff;
        padding:10px 20px;border-radius:8px;
        font-size:16px;cursor:pointer;
        display:inline-block;margin:4px 2px;
      ">DOWNLOAD</pre>`;
      a.addEventListener('click', downloadAll);
      sel.appendChild(a);
      buttonInjected = true;
      console.log('[Downloader] button added');
    }
    else if(!buttonInjected) setTimeout(tryInsertButton,3000);
  }

  function parseMesh(o){
    const prim = [];
    o._primitives.forEach(p=>{
      if(p && p.indices) prim.push({mode:p.mode,indices:p.indices._elements});
    });
    const A = o._attributes;
    const uvKey = ['TexCoord0','TexCoord1','TexCoord2','TexCoord3','TexCoord4','TexCoord5','TexCoord6','TexCoord7','TexCoord8']
      .find(k=>A[k]);
    return {
      vertex: A.Vertex._elements,
      normal: A.Normal?A.Normal._elements:[],
      uv: uvKey?A[uvKey]._elements:[],
      primitives: prim
    };
  }

  function saveMesh(m){
    let s = `mtllib ${m.name}.mtl\n` + `o ${m.name}\n`;
    m.obj.vertex.forEach((v,i)=>{ if(i%3===0) s+=`v ${v} ${m.obj.vertex[i+1]} ${m.obj.vertex[i+2]}\n`; });
    m.obj.normal.forEach((v,i)=>{ if(i%3===0) s+=`vn ${v} ${m.obj.normal[i+1]} ${m.obj.normal[i+2]}\n`; });
    m.obj.uv.forEach((v,i)=>{ if(i%2===0) s+=`vt ${v} ${m.obj.uv[i+1]}\n`; });
    s+='s on\n';
    const hasVT = m.obj.uv.length>0, hasVN = m.obj.normal.length>0;
    m.obj.primitives.forEach(p=>{
      if(p.mode===4||p.mode===5){
        const strip = p.mode===5;
        for(let j=0; j+2<p.indices.length; strip? j++ : j+=3){
          s+='f ';
          let order=[0,1,2];
          if(strip && (j%2)) order=[0,2,1];
          order.forEach(o=>{
            const idx=p.indices[j+o]+1;
            s+=idx;
            if(hasVT||hasVN){
              s+='/';
              if(hasVT) s+=idx;
              if(hasVN) s+=`/${idx}`;
            }
            s+=' ';
          });
          s+='\n';
        }
      }
    });
    objects[`${m.name}.obj`] = new Blob([s],{type:'text/plain'});
  }

  function packageAll(){
    Object.keys(objects).forEach(fn=> folder.file(fn,objects[fn],{binary:true}));
    const title = document.querySelector('.model-name__label')?.textContent.trim()||'sketchfab';
    zip.generateAsync({type:'blob'}).then(b=>saveAs(b,`${title}.zip`));
  }

  function downloadAll(){
    console.log('[Downloader] starting download');
    reset();
    window.allmodel.forEach((o,i)=> saveMesh({name:`model_${i}`,obj:parseMesh(o)}));
    packageAll();
  }

  window.attachbody = o=>{
    if(!o._faked && (o._name||(o.stateset&&o.stateset._name))){
      o._faked=true;
      if(o._name!=="composer layer" && o._name!=="Ground - Geometry"){
        window.allmodel.push(o);
        console.log('[Downloader] captured mesh',o._name||'unnamed');
      }
    }
  };

  window.drawhookcanvas = (e,mod)=>{
    if(!mod) return e;
    let best={size:0}, url=e.url;
    mod.attributes.images.forEach(img=>{
      const ok = e.options.format==='A'?img.options.format==='A':true;
      if(ok&&img.size>best.size){best=img;url=img.url;}
    });
    if(!cache[url]) cache[url]={name:mod.attributes.name};
    return best;
  };

  window.drawhookimg = (gl,t)=>{
    const url=t[5].currentSrc;
    if(!cache[url]) return;
    const w=t[5].width, h=t[5].height, px=new Uint8Array(w*h*4);
    gl.readPixels(0,0,w,h,gl.RGBA,gl.UNSIGNED_BYTE,px);
    const row=w*4;
    for(let y=0;y<h/2;y++){
      const top=y*row, bot=(h-y-1)*row, tmp=px.slice(top,top+row);
      px.copyWithin(top,bot,bot+row); px.set(tmp,bot);
    }
    const c=document.createElement('canvas');c.width=w;c.height=h;
    const cx=c.getContext('2d'), id=cx.createImageData(w,h);
    id.data.set(px);cx.putImageData(id,0,0);
    const bn=cache[url].name.replace(/\.[^.]+$/,'');
    c.toBlob(b=>objects[`${bn}.png`]=b,'image/png');
  };

  ;(function(){
    class E{constructor(s){this.script=s;this._cancel=false;}preventDefault(){this._cancel=true;}}
    const cbs=[];
    window.addBeforeScriptExecuteListener=f=>{if(typeof f!=='function')throw'';cbs.push(f);};
    const disp=n=>{ if(n.tagName==='SCRIPT'){const ev=new E(n);cbs.forEach(f=>f(ev)); if(ev._cancel)n.remove();}};
    new MutationObserver(ms=>ms.forEach(m=>m.addedNodes.forEach(disp))).observe(document,{childList:true,subtree:true});
  })();

  window.onbeforescriptexecute = e=>{
    const s=e.script?.src||'';
    if(!/web\/dist\/|standaloneViewer/.test(s)) return;
    e.preventDefault();
    const r=new XMLHttpRequest();r.open('GET',s,false);r.send();
    let t=r.responseText;
    t=t.replace(rRend1,"$& ,i");
    t=t.replace(rRend2,"$& ,image_data");
    t=t.replace(rDrawArrays,"$& ,window.drawhookimg(t,image_data)");
    t=t.replace(rGetResImg,"$& e=window.drawhookcanvas(e,this._imageModel);");
    t=t.replace(rDrawGeom,(m,g)=>g+";window.attachbody(t);");
    const s2=document.createElement('script');s2.text=t;document.head.appendChild(s2);
    setTimeout(tryInsertButton,3000);
  };
})();
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