Clay-Create/pointcloud_viewer.html at Main · blabha/Clay-Create · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Point Cloud Viewer</title>
<script src="https://cdn.jsdelivr.net/npm/three@0.128.0/build/three.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/controls/OrbitControls.js"></script>
<style>
  * { margin:0; padding:0; box-sizing:border-box; }
  body { background:#111; color:#eee; font-family:sans-serif; overflow:hidden; }
  #drop {
    position:fixed; inset:0; display:flex; flex-direction:column;
    align-items:center; justify-content:center; gap:14px; background:#111; z-index:10;
  }
  #drop h2 { color:#777; font-size:1rem; letter-spacing:0.1em; }
  #drop label {
    padding:10px 28px; background:#1c1c1c; border:1px solid #444;
    border-radius:6px; cursor:pointer; color:#bbb; font-size:0.85rem;
  }
  #drop label:hover { background:#252525; color:#fff; }
  #drop input { display:none; }
  #drop small { color:#333; font-size:10px; }
  canvas { display:block; }
  #status { position:fixed; top:12px; right:14px; font-size:11px; color:#666; }
  #info   { position:fixed; bottom:12px; left:14px; font-size:10px; color:#333; }
  #reopen {
    display:none; position:fixed; top:12px; left:14px;
    padding:5px 12px; background:#1c1c1c; border:1px solid #333;
    border-radius:4px; cursor:pointer; color:#777; font-size:11px;
  }
  #reopen:hover { color:#ccc; }
</style>
</head>
<body>

<div id="drop">
  <h2>POINT CLOUD VIEWER</h2>
  <label>Open .ply file <input type="file" id="fileInput" accept=".ply"></label>
  <small>or drag &amp; drop a .ply anywhere</small>
</div>

<button id="reopen" onclick="document.getElementById('fileInput').click()">Open file</button>
<div id="status"></div>
<div id="info">drag · scroll to zoom · right-drag to pan</div>

<script>
// ── Three.js scene ────────────────────────────────────────────────────────────
var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0x111111);
document.body.appendChild(renderer.domElement);

var scene  = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 0.0001, 10000);
camera.position.set(0, 0.3, 1.5);

var controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.07;

window.addEventListener('resize', function () {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
});

(function animate() { requestAnimationFrame(animate); controls.update(); renderer.render(scene, camera); })();

// ── PLY parser ────────────────────────────────────────────────────────────────
function parsePLY(buffer) {
  var bytes = new Uint8Array(buffer);

  // Find end_header\n
  var marker = 'end_header\n';
  var headerEnd = -1;
  outer: for (var i = 0; i < bytes.length - marker.length; i++) {
    for (var j = 0; j < marker.length; j++) {
      if (bytes[i + j] !== marker.charCodeAt(j)) continue outer;
    }
    headerEnd = i + marker.length;
    break;
  }
  // Also try end_header\r\n
  if (headerEnd === -1) {
    marker = 'end_header\r\n';
    outer2: for (var i = 0; i < bytes.length - marker.length; i++) {
      for (var j = 0; j < marker.length; j++) {
        if (bytes[i + j] !== marker.charCodeAt(j)) continue outer2;
      }
      headerEnd = i + marker.length;
      break;
    }
  }
  if (headerEnd === -1) throw new Error('end_header not found in file');

  var header = new TextDecoder('ascii').decode(bytes.slice(0, headerEnd));

  var vcMatch = header.match(/element vertex (\d+)/);
  if (!vcMatch) throw new Error('vertex count missing');
  var n = parseInt(vcMatch[1]);
  if (n === 0) throw new Error('Point cloud has 0 vertices');

  // Parse ordered property list
  var props = [];
  var typeSize = { float:4, float32:4, double:8, float64:8,
                   uchar:1, uint8:1, char:1, int8:1,
                   ushort:2, uint16:2, short:2, int16:2,
                   uint:4, uint32:4, int:4, int32:4 };
  var re = /^property\s+(\S+)\s+(\S+)/mg, m;
  while ((m = re.exec(header)) !== null) {
    props.push({ type: m[1].toLowerCase(), name: m[2].toLowerCase() });
  }

  var stride = 0;
  var offsets = [];
  for (var pi = 0; pi < props.length; pi++) {
    offsets.push(stride);
    stride += (typeSize[props[pi].type] || 4);
  }

  // slice() creates a fresh zero-based buffer — avoids alignment errors with DataView(buf, offset)
  var dataBuf  = buffer.slice(headerEnd);
  var dv       = new DataView(dataBuf);
  var maxN     = Math.floor(dataBuf.byteLength / stride);
  if (maxN < n) { console.warn('PLY truncated: using ' + maxN + ' of ' + n); n = maxN; }

  var xs = new Float32Array(n), ys = new Float32Array(n), zs = new Float32Array(n);
  var rs = new Uint8Array(n),   gs = new Uint8Array(n),   bs = new Uint8Array(n);

  for (var i = 0; i < n; i++) {
    var base = i * stride;
    for (var pi = 0; pi < props.length; pi++) {
      var p = props[pi], o = base + offsets[pi], v;
      var t = p.type;
      if      (t === 'float'   || t === 'float32') v = dv.getFloat32(o, true);
      else if (t === 'uchar'   || t === 'uint8')   v = dv.getUint8(o);
      else if (t === 'double'  || t === 'float64') v = dv.getFloat64(o, true);
      else if (t === 'int'     || t === 'int32')   v = dv.getInt32(o, true);
      else if (t === 'uint'    || t === 'uint32')  v = dv.getUint32(o, true);
      else if (t === 'short'   || t === 'int16')   v = dv.getInt16(o, true);
      else if (t === 'ushort'  || t === 'uint16')  v = dv.getUint16(o, true);
      else v = dv.getUint8(o);
      var nm = p.name;
      if      (nm === 'x')                    xs[i] = v;
      else if (nm === 'y')                    ys[i] = v;
      else if (nm === 'z')                    zs[i] = v;
      else if (nm === 'red'   || nm === 'r')  rs[i] = v;
      else if (nm === 'green' || nm === 'g')  gs[i] = v;
      else if (nm === 'blue'  || nm === 'b')  bs[i] = v;
    }
  }
  return { n:n, xs:xs, ys:ys, zs:zs, rs:rs, gs:gs, bs:bs };
}

// ── Show point cloud ──────────────────────────────────────────────────────────
var status = document.getElementById('status');
var ptMesh = null;

function showCloud(buffer, name) {
  var parsed;
  try { parsed = parsePLY(buffer); }
  catch(e) { status.textContent = 'Error: ' + e.message; status.style.color = '#c55'; return; }

  var n = parsed.n, xs = parsed.xs, ys = parsed.ys, zs = parsed.zs;
  var rs = parsed.rs, gs = parsed.gs, bs = parsed.bs;

  var cx = 0, cy = 0, cz = 0;
  for (var i = 0; i < n; i++) { cx += xs[i]; cy += ys[i]; cz += zs[i]; }
  cx /= n; cy /= n; cz /= n;

  var maxR = 0;
  var pos = new Float32Array(n * 3);
  var col = new Float32Array(n * 3);
  for (var i = 0; i < n; i++) {
    var dx = xs[i]-cx, dy = ys[i]-cy, dz = zs[i]-cz;
    pos[i*3]=dx; pos[i*3+1]=dy; pos[i*3+2]=dz;
    col[i*3]=rs[i]/255; col[i*3+1]=gs[i]/255; col[i*3+2]=bs[i]/255;
    var r = Math.sqrt(dx*dx+dy*dy+dz*dz);
    if (r > maxR) maxR = r;
  }

  if (ptMesh) { scene.remove(ptMesh); ptMesh.geometry.dispose(); ptMesh.material.dispose(); }

  var geo = new THREE.BufferGeometry();
  geo.setAttribute('position', new THREE.BufferAttribute(pos, 3));
  geo.setAttribute('color',    new THREE.BufferAttribute(col, 3));

  var mat = new THREE.PointsMaterial({
    size: Math.max(maxR * 0.006, 0.0005),
    vertexColors: true,
    sizeAttenuation: true
  });

  ptMesh = new THREE.Points(geo, mat);
  scene.add(ptMesh);

  camera.position.set(0, maxR * 0.5, maxR * 2.5);
  controls.target.set(0, 0, 0);
  controls.update();

  status.textContent = name + '  ·  ' + n.toLocaleString() + ' pts';
  status.style.color = '#5a5';
  document.getElementById('drop').style.display   = 'none';
  document.getElementById('reopen').style.display = 'block';
}

function readFile(file) {
  var r = new FileReader();
  r.onload = function(e) { showCloud(e.target.result, file.name); };
  r.readAsArrayBuffer(file);
}

document.getElementById('fileInput').addEventListener('change', function(e) {
  if (e.target.files[0]) readFile(e.target.files[0]);
});
document.addEventListener('dragover', function(e) { e.preventDefault(); });
document.addEventListener('drop', function(e) {
  e.preventDefault();
  var f = e.dataTransfer.files[0];
  if (f && f.name.toLowerCase().endsWith('.ply')) readFile(f);
});
</script>
</body>
</html>