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HTML 

              
                <!-- Import the component -->
<script type="module" src="https://unpkg.com/@google/model-viewer/dist/model-viewer.min.js"></script>

<model-viewer id="dimension-demo" ar ar-modes="webxr" ar-scale="fixed" camera-orbit="-30deg auto auto" max-camera-orbit="auto 100deg auto" shadow-intensity="1" camera-controls touch-action="pan-y" src="https://assets.codepen.io/9589/Chair.glb" alt="A 3D model of an armchair.">
  <button slot="hotspot-dot+X-Y+Z" class="dot" data-position="1 -1 1" data-normal="1 0 0"></button>
  <button slot="hotspot-dim+X-Y" class="dim" data-position="1 -1 0" data-normal="1 0 0"></button>
  <button slot="hotspot-dot+X-Y-Z" class="dot" data-position="1 -1 -1" data-normal="1 0 0"></button>
  <button slot="hotspot-dim+X-Z" class="dim" data-position="1 0 -1" data-normal="1 0 0"></button>
  <button slot="hotspot-dot+X+Y-Z" class="dot show" data-position="1 1 -1" data-normal="0 1 0"></button>
  <button slot="hotspot-dim+Y-Z" class="dim show" data-position="0 -1 -1" data-normal="0 1 0"></button>
  <button slot="hotspot-dot-X+Y-Z" class="dot show" data-position="-1 1 -1" data-normal="0 1 0"></button>
  <button slot="hotspot-dim-X-Z" class="dim" data-position="-1 0 -1" data-normal="-1 0 0"></button>
  <button slot="hotspot-dot-X-Y-Z" class="dot" data-position="-1 -1 -1" data-normal="-1 0 0"></button>
  <button slot="hotspot-dim-X-Y" class="dim" data-position="-1 -1 0" data-normal="-1 0 0"></button>
  <button slot="hotspot-dot-X-Y+Z" class="dot" data-position="-1 -1 1" data-normal="-1 0 0"></button>
  <svg id="lines" xmlns="http://www.w3.org/2000/svg" class="dimensionLineContainer">
    <line class="dimensionLine"></line>
    <line class="dimensionLine"></line>
    <line class="dimensionLine"></line>
    <line class="dimensionLine"></line>
    <line class="dimensionLine"></line>
  </svg>

  <div id="controls" class="dim">
    <label for="src">Product:</label>
    <select id="src">
      <option value="https://assets.codepen.io/9589/Chair.glb">Chair</option>
    </select><br>

    <label for="show-dimensions">Show Dimensions:</label>
    <input id="show-dimensions" type="checkbox" checked="true">
  </div>
</model-viewer>

<script type="module">
  const modelViewer = document.querySelector('#dimension-demo');
  modelViewer.querySelector('#src').addEventListener('input', (event) => {
    modelViewer.src = event.target.value;
  });
  const checkbox = modelViewer.querySelector('#show-dimensions');

  function setVisibility(element) {
    if (checkbox.checked) {
      element.classList.remove('hide');
    } else {
      element.classList.add('hide');
    }
  }
  checkbox.addEventListener('change', () => {
    setVisibility(modelViewer.querySelector('#lines'));
    modelViewer.querySelectorAll('button').forEach((hotspot) => {
      setVisibility(hotspot);
    });
  });
  modelViewer.addEventListener('load', () => {
    const center = modelViewer.getBoundingBoxCenter();
    const size = modelViewer.getDimensions();
    const x2 = size.x / 2;
    const y2 = size.y / 2;
    const z2 = size.z / 2;
    modelViewer.updateHotspot({
      name: 'hotspot-dot+X-Y+Z',
      position: `${center.x + x2} ${center.y - y2} ${center.z + z2}`
    });
    modelViewer.updateHotspot({
      name: 'hotspot-dim+X-Y',
      position: `${center.x + x2} ${center.y - y2} ${center.z}`
    });
    modelViewer.querySelector('button[slot="hotspot-dim+X-Y"]').textContent =
      `${(size.z * 100).toFixed(0)} cm`;
    modelViewer.updateHotspot({
      name: 'hotspot-dot+X-Y-Z',
      position: `${center.x + x2} ${center.y - y2} ${center.z - z2}`
    });
    modelViewer.updateHotspot({
      name: 'hotspot-dim+X-Z',
      position: `${center.x + x2} ${center.y} ${center.z - z2}`
    });
    modelViewer.querySelector('button[slot="hotspot-dim+X-Z"]').textContent =
      `${(size.y * 100).toFixed(0)} cm`;
    modelViewer.updateHotspot({
      name: 'hotspot-dot+X+Y-Z',
      position: `${center.x + x2} ${center.y + y2} ${center.z - z2}`
    });
    modelViewer.updateHotspot({
      name: 'hotspot-dim+Y-Z',
      position: `${center.x} ${center.y + y2} ${center.z - z2}`
    });
    modelViewer.querySelector('button[slot="hotspot-dim+Y-Z"]').textContent =
      `${(size.x * 100).toFixed(0)} cm`;
    modelViewer.updateHotspot({
      name: 'hotspot-dot-X+Y-Z',
      position: `${center.x - x2} ${center.y + y2} ${center.z - z2}`
    });
    modelViewer.updateHotspot({
      name: 'hotspot-dim-X-Z',
      position: `${center.x - x2} ${center.y} ${center.z - z2}`
    });
    modelViewer.querySelector('button[slot="hotspot-dim-X-Z"]').textContent =
      `${(size.y * 100).toFixed(0)} cm`;
    modelViewer.updateHotspot({
      name: 'hotspot-dot-X-Y-Z',
      position: `${center.x - x2} ${center.y - y2} ${center.z - z2}`
    });
    modelViewer.updateHotspot({
      name: 'hotspot-dim-X-Y',
      position: `${center.x - x2} ${center.y - y2} ${center.z}`
    });
    modelViewer.querySelector('button[slot="hotspot-dim-X-Y"]').textContent =
      `${(size.z * 100).toFixed(0)} cm`;
    modelViewer.updateHotspot({
      name: 'hotspot-dot-X-Y+Z',
      position: `${center.x - x2} ${center.y - y2} ${center.z + z2}`
    });
    // update svg
    function drawLine(svgLine, dotHotspot1, dotHotspot2, dimensionHotspot) {
      if (dotHotspot1 && dotHotspot1) {
        svgLine.setAttribute('x1', dotHotspot1.canvasPosition.x);
        svgLine.setAttribute('y1', dotHotspot1.canvasPosition.y);
        svgLine.setAttribute('x2', dotHotspot2.canvasPosition.x);
        svgLine.setAttribute('y2', dotHotspot2.canvasPosition.y);
        // use provided optional hotspot to tie visibility of this svg line to
        if (dimensionHotspot && !dimensionHotspot.facingCamera) {
          svgLine.classList.add('hide');
        } else {
          svgLine.classList.remove('hide');
        }
      }
    }
    const lines = modelViewer.querySelectorAll('line');
    // use requestAnimationFrame to update with renderer
    const startSVGRenderLoop = () => {
      drawLine(lines[0], modelViewer.queryHotspot('hotspot-dot+X-Y+Z'), modelViewer.queryHotspot('hotspot-dot+X-Y-Z'), modelViewer.queryHotspot('hotspot-dim+X-Y'));
      drawLine(lines[1], modelViewer.queryHotspot('hotspot-dot+X-Y-Z'), modelViewer.queryHotspot('hotspot-dot+X+Y-Z'), modelViewer.queryHotspot('hotspot-dim+X-Z'));
      drawLine(lines[2], modelViewer.queryHotspot('hotspot-dot+X+Y-Z'), modelViewer.queryHotspot('hotspot-dot-X+Y-Z')); // always visible
      drawLine(lines[3], modelViewer.queryHotspot('hotspot-dot-X+Y-Z'), modelViewer.queryHotspot('hotspot-dot-X-Y-Z'), modelViewer.queryHotspot('hotspot-dim-X-Z'));
      drawLine(lines[4], modelViewer.queryHotspot('hotspot-dot-X-Y-Z'), modelViewer.queryHotspot('hotspot-dot-X-Y+Z'), modelViewer.queryHotspot('hotspot-dim-X-Y'));
      requestAnimationFrame(startSVGRenderLoop);
    };
    startSVGRenderLoop();
  });
</script>
<style>
  #controls {
    position: absolute;
    bottom: 16px;
    left: 16px;
    max-width: unset;
    transform: unset;
    pointer-events: auto;
  }

  .dot {
    display: block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: none;
    box-sizing: border-box;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
    background: #fff;
    pointer-events: none;
    --min-hotspot-opacity: 0;
  }

  .dim {
    background: #fff;
    border-radius: 4px;
    border: none;
    box-sizing: border-box;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
    color: rgba(0, 0, 0, 0.8);
    display: block;
    font-family: Futura, Helvetica Neue, sans-serif;
    font-size: 18px;
    font-weight: 700;
    max-width: 128px;
    overflow-wrap: break-word;
    padding: 0.5em 1em;
    position: absolute;
    width: max-content;
    height: max-content;
    transform: translate3d(-50%, -50%, 0);
    pointer-events: none;
    --min-hotspot-opacity: 0;
  }

  .dimensionLineContainer {
    pointer-events: none;
    position: fixed;
    display: block;
    width: 100%;
    height: 100%;
  }

  .dimensionLine {
    stroke: #16a5e6;
    stroke-width: 2;
    stroke-dasharray: 2
  }

  .show {
    --min-hotspot-opacity: 1;
  }

  .hide {
    display: none;
  }

  /* This keeps child nodes hidden while the element loads */
  :not(:defined)>* {
    display: none;
  }
</style>
!

CSS 

              
                body,
html {
  margin: 0;
  padding: 0;
  background: #000;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#dimension-demo {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}

#controls {
  display: none;
}
!

JS
!
999px

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