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Set elevated three-quarter demo camera

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Richard Palethorpe 2026-08-22 22:03:54 +01:00
parent a0f85c0647
commit 2558baec65
1 changed files with 2 additions and 2 deletions
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demo/index.html
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@ -10,8 +10,8 @@ const parents=[-1,0,0,0,1,2,3,4,5,6,7,8,9,9,9,12,13,14,16,17,18,19];
// global-rotation fixture. The generator persists local rotations and root
// translations; these fixed parent-local bone vectors make them viewable here.
const offsets=[[0,0,0],[.052299,-.093936,-.027607],[-.057193,-.106548,-.022218],[-.001496,.11293,-.024981],[.058867,-.416442,-.006557],[-.048074,-.39756,-.014061],[.0069,.145636,-.006859],[-.041738,-.437584,-.029512],[.014489,-.446853,-.01803],[-.010334,.056082,.021116],[.049294,-.065279,.126259],[-.040575,-.065287,.127076],[-.011026,.171365,-.028827],[.047725,.087643,-.008375],[-.046636,.086612,-.014864],[.024654,.175391,.024463],[.126285,.05768,-.013885],[-.109342,.053674,-.009118],[.272907,-.069853,-.039094],[-.292029,-.03544,-.024565],[.276174,.021254,-.002478],[-.271878,-.004835,-.016445]];
const canvas=document.querySelector('#view'),ctx=canvas.getContext('2d'),slider=document.querySelector('#frame'),promptBox=document.querySelector('#prompt'),generate=document.querySelector('#generate'),status=document.querySelector('#status'),items=document.querySelector('#items');let selected,root,rotations,frame=0,playing=true,last=0,animations=[],activeRequest,activeStarted;const view={yaw:-.56,pitch:.28,zoom:2700,panX:0,panY:0};
function reset(){Object.assign(view,{yaw:-.56,pitch:.28,zoom:2700,panX:0,panY:0});draw()}function rotate(q,v){const[x,y,z,w]=q,[vx,vy,vz]=v,tx=2*(y*vz-z*vy),ty=2*(z*vx-x*vz),tz=2*(x*vy-y*vx);return[vx+w*tx+y*tz-z*ty,vy+w*ty+z*tx-x*tz,vz+w*tz+x*ty-y*tx]};function add(a,b){return[a[0]+b[0],a[1]+b[1],a[2]+b[2]]}function multiply(a,b){const[x,y,z,w]=a,[X,Y,Z,W]=b;return[x*W+w*X+y*Z-z*Y,y*W+w*Y+z*X-x*Z,z*W+w*Z+x*Y-y*X,w*W-x*X-y*Y-z*Z]}
const canvas=document.querySelector('#view'),ctx=canvas.getContext('2d'),slider=document.querySelector('#frame'),promptBox=document.querySelector('#prompt'),generate=document.querySelector('#generate'),status=document.querySelector('#status'),items=document.querySelector('#items');let selected,root,rotations,frame=0,playing=true,last=0,animations=[],activeRequest,activeStarted;const defaultView={yaw:-.68,pitch:-.20,zoom:2700,panX:0,panY:0},view={...defaultView};
function reset(){Object.assign(view,defaultView);draw()}function rotate(q,v){const[x,y,z,w]=q,[vx,vy,vz]=v,tx=2*(y*vz-z*vy),ty=2*(z*vx-x*vz),tz=2*(x*vy-y*vx);return[vx+w*tx+y*tz-z*ty,vy+w*ty+z*tx-x*tz,vz+w*tz+x*ty-y*tx]};function add(a,b){return[a[0]+b[0],a[1]+b[1],a[2]+b[2]]}function multiply(a,b){const[x,y,z,w]=a,[X,Y,Z,W]=b;return[x*W+w*X+y*Z-z*Y,y*W+w*Y+z*X-x*Z,z*W+w*Z+x*Y-y*X,w*W-x*X-y*Y-z*Z]}
function pose(){if(!selected||!root||!rotations)return[];const positions=[],global=[];for(let j=0;j<22;j++){const q=Array.from(rotations.subarray((frame*22+j)*4,(frame*22+j+1)*4)),p=parents[j];if(p<0){global[j]=q;positions[j]=Array.from(root.subarray(frame*3,frame*3+3))}else{global[j]=multiply(global[p],q);positions[j]=add(positions[p],rotate(global[p],offsets[j]))}}return positions}function project([x,y,z]){const rx=x*Math.cos(view.yaw)-z*Math.sin(view.yaw),rz=x*Math.sin(view.yaw)+z*Math.cos(view.yaw),ry=y*Math.cos(view.pitch)-rz*Math.sin(view.pitch),dz=y*Math.sin(view.pitch)+rz*Math.cos(view.pitch)+8;return[canvas.width/2+view.panX+view.zoom*rx/dz,canvas.height*.78+view.panY-view.zoom*ry/dz]}
function ground(){const cx=0,cz=0,step=.5,extent=6;ctx.strokeStyle='#173943';ctx.lineWidth=2;for(let i=-12;i<=12;i++){let a=project([cx-extent,0,cz+i*step]),b=project([cx+extent,0,cz+i*step]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke();a=project([cx+i*step,0,cz-extent]);b=project([cx+i*step,0,cz+extent]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke()}ctx.strokeStyle='#23606b';ctx.lineWidth=3;const x=project([cx-extent,0,cz]),z=project([cx,0,cz-extent]),xe=project([cx+extent,0,cz]),ze=project([cx,0,cz+extent]);ctx.beginPath();ctx.moveTo(x[0],x[1]);ctx.lineTo(xe[0],xe[1]);ctx.moveTo(z[0],z[1]);ctx.lineTo(ze[0],ze[1]);ctx.stroke()}function draw(){ctx.clearRect(0,0,canvas.width,canvas.height);const p=pose();ground();if(p.length){ctx.lineCap='round';for(let pass=0;pass<2;pass++){ctx.strokeStyle=pass?'#65eee1':'#071014';ctx.lineWidth=pass?7:13;for(let i=1;i<22;i++){const a=project(p[i]),b=project(p[parents[i]]);ctx.beginPath();ctx.moveTo(a[0],a[1]);ctx.lineTo(b[0],b[1]);ctx.stroke()}}for(const x of p){const a=project(x);ctx.fillStyle='#071014';ctx.beginPath();ctx.arc(a[0],a[1],7,0,Math.PI*2);ctx.fill();ctx.fillStyle='#ecfffd';ctx.beginPath();ctx.arc(a[0],a[1],4,0,Math.PI*2);ctx.fill()}}slider.value=frame;document.querySelector('#frameText').textContent=selected?`frame ${frame+1} / ${selected.frames}`:'No animation selected'}function tick(t){if(playing&&selected&&t-last>1000/30){frame=(frame+1)%selected.frames;last=t;draw()}requestAnimationFrame(tick)}
async function select(a){if(a.status!=='ready')return;selected=a;promptBox.value=a.prompt;status.className='readout';status.textContent=`Selected ${a.id.slice(0,8)} · prompt restored`;[root,rotations]=await Promise.all([fetch(`/api/animations/${a.id}/root.f32`).then(r=>r.arrayBuffer()).then(b=>new Float32Array(b)),fetch(`/api/animations/${a.id}/rotations.f32`).then(r=>r.arrayBuffer()).then(b=>new Float32Array(b))]);frame=0;slider.max=a.frames-1;renderGallery();draw()}function renderGallery(){if(!animations.length){items.textContent='No animations yet.';return}items.replaceChildren(...animations.map(a=>{const b=document.createElement('button');b.className='item '+a.status+(selected?.id===a.id?' active':'');b.disabled=a.status!=='ready';b.innerHTML=`<p>${a.prompt}</p><span class="status">${a.status} · ${a.frames} frames · ${a.diffusion_steps} steps</span>${a.error?`<div class="error">${a.error}</div>`:''}`;b.onclick=()=>select(a);return b}))}function showProgress(){const a=animations.find(a=>a.id===activeRequest);if(!a)return;if(a.status==='ready'){status.className='readout';status.textContent='Generation complete — select it from the gallery to play it.';activeRequest=undefined;generate.disabled=false;return}if(a.status==='failed'){status.className='error';status.textContent=`Generation failed: ${a.error}`;activeRequest=undefined;generate.disabled=false;return}const seconds=Math.max(0,Math.floor((Date.now()-activeStarted)/1000));status.className='readout progress';status.textContent=a.status==='running'?`Generating motion… ${seconds}s elapsed`:`Queued for generation… ${seconds}s elapsed`;generate.disabled=true}async function refresh(){animations=await fetch('/api/animations').then(r=>r.json());renderGallery();showProgress()}generate.onclick=async()=>{const prompt=promptBox.value.trim();if(!prompt)return;generate.disabled=true;status.className='readout progress';status.textContent='Submitting generation…';try{const r=await fetch('/api/generate',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({prompt,frames:150,steps:100,seed:0})});if(!r.ok)throw new Error(await r.text());const a=await r.json();activeRequest=a.id;activeStarted=Date.now();await refresh()}catch(e){status.className='error';status.textContent=e.message;generate.disabled=false}};