Point Cloud

<!--
  示例：三维点云
  要点：PointCloudLayer 加 OrbitView 渲染笛卡尔坐标的螺旋点云，颜色按高度分层
  依赖：deck.gl 9.0 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>三维点云</title>
<style>
  html,body{height:100%;margin:0;background:#0d1117}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif;color:#e6e8ec}
  .bar{position:relative;z-index:5;flex:0 0 auto;padding:8px 12px;background:#161b22;border-bottom:1px solid #252c36;
       display:flex;gap:14px;align-items:center;font-size:12px;color:#8b93a1;flex-wrap:wrap}
  .bar b{color:#58a6ff;font-weight:600}
  .bar label{display:flex;align-items:center;gap:5px;cursor:pointer}
  .bar input[type=checkbox]{accent-color:#4f9ef8}
  .bar input[type=range]{width:150px;accent-color:#4f9ef8}
  .bar button{font:inherit;font-size:12px;padding:3px 10px;border-radius:4px;cursor:pointer;
       border:1px solid #2f3947;background:#1d242e;color:#c9d3e0}
  .bar button:hover{background:#26303d}
  #cv{flex:1 1 auto;min-height:0;width:100%;display:block}

</style>
</head>
<body>
<div class="bar"><span>点数 <b id="n">—</b></span><span>拖拽旋转 · 滚轮缩放</span></div>
<canvas id="cv"></canvas>
<script src="https://cdn.jsdelivr.net/npm/deck.gl@9.0.35/dist.min.js"></script>
<script>
(function () {
  'use strict';

  if (typeof deck === 'undefined') {
    document.body.innerHTML =
      '<div style="padding:24px;color:#ff8c74">deck.gl 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }
  var N = 40000;
  var pts = [];
  for (var i = 0; i < N; i++) {
    var t = i / N;
    var strand = i % 2;
    var angle = t * 34 * Math.PI + strand * Math.PI;
    var radius = 1.6 * (1 - t * 0.25);
    var z = t * 8 - 4;
    pts.push({
      pos: [Math.cos(angle) * radius, z, Math.sin(angle) * radius],
      h: (z + 4) / 8
    });
  }

  document.getElementById('n').textContent = N.toLocaleString();

  var deckgl = new deck.Deck({
    canvas: 'cv',
    width: '100%',
    height: '100%',
    views: new deck.OrbitView({ target: [0, 0, 0] }),
    initialViewState: { target: [0, 0, 0], rotationX: 18, rotationOrbit: -40, zoom: 0.4 },
    controller: true,
    layers: [
      new deck.PointCloudLayer({
        id: 'cloud',
        data: pts,
        coordinateSystem: deck.COORDINATE_SYSTEM.CARTESIAN,
        getPosition: function (d) { return d.pos; },
        getColor: function (d) {
          return [Math.round(70 + 180 * d.h), Math.round(170 - 40 * d.h), Math.round(255 - 150 * d.h), 235];
        },
        pointSize: 2
      })
    ]
  });
  window.__deck = deckgl;
})();
</script>
</body>
</html>