diff --git a/topics/02_passive/index.md b/topics/02_passive/index.md
index 8aeeb32acc678956c3d8de1dcb1b89680d5e06ba..a0219221ea47d26fca6c846afa01d24fb1d12824 100644
--- a/topics/02_passive/index.md
+++ b/topics/02_passive/index.md
@@ -37,7 +37,677 @@ Photogrammetry is the collection and organization of reliable information about
 
 <p>Photogrammetry is useful for outdoors settings, where all you need is a handheld camera and some patience. In this example, note the loss of quality towards the top, as pixel resolution becomes problematic:</p>
 
-<div class="sketchfab-embed-wrapper"> <iframe title="Arc de Triomphe - photogrammetry" frameborder="0" allowfullscreen="" mozallowfullscreen="true" webkitallowfullscreen="true" allow="fullscreen; autoplay; vr" xr-spatial-tracking="" execution-while-out-of-viewport="" execution-while-not-rendered="" web-share="" src="https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed"> </iframe> <p style="font-size: 13px; font-weight: normal; margin: 5px; color: #4A4A4A;"> <a href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Arc de Triomphe - photogrammetry </a> by <a href="https://sketchfab.com/nicolasdiolez?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;"> Nicolas Diolez </a> on <a href="https://sketchfab.com?utm_medium=embed&amp;utm_campaign=share-popup&amp;utm_content=65937fd27de647c0a8ac99ce8275c03e" target="_blank" style="font-weight: bold; color: #1CAAD9;">Sketchfab</a></p></div>
+
+<main class="viewer has-model " aria-label="sketchfab-viewer">
+
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+
+    <div class="titlebar">
+
+        <div class="summary">
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+                <div class="avatar">
+
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+
+  <div class="image-container --cover" style="width:32px;">
+                    <img class="image-container__image" src="https://media.sketchfab.com/avatars/a891e9152dfa4c819dfc0500a5fd5867/5512aead32c84bc0bf64e6c349abed4c.jpeg" alt="">
+                    <div style="padding-top:100.0%;"></div>
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+                </div>
+                <div class="model-info">
+                    <h1 class="title"><span class="model-name">
+
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+            <a class="model-name__label" data-route="" href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e" target="_blank" title="Buy Arc de Triomphe - photogrammetry 3D Model">Arc de Triomphe - photogrammetry</a>
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+        <meta itemprop="award" content="Staff Pick">
+        <span class="flag --staffpicked " title="Staff Picks"></span>
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+    </span></h1>
+                    <h2>by
+
+                            <a target="_blank" href="https://sketchfab.com/nicolasdiolez">Nicolas Diolez</a>
+
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+
+        <div class="landing" data-action="start">
+
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+                <div class="preview">
+                    <div class="image-container --cover" style="width:100%;">
+                    <img class="image-container__image" src="https://media.sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/thumbnails/2a28add5c0ad45f58ab47c285fda9114/9942f16c4bf040edaba728be68c265d8.jpeg" alt="">
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+
+                <div class="start-button">
+                    <button class="play-button ">
+                        <i class="viewer-icon-play"></i>
+                        <span class="label">3D</span>
+                    </button>
+                </div>
+
+
+
+
+        <div class="watermark">
+            <a title="View on Sketchfab" data-action="watermark" href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e" target="_blank"></a>
+        </div>
+
+
+
+        </div>
+
+        <div class="overlays">
+
+            <div class="overlay help hidden">
+                <a href="#" class="close viewer-icon-close" aria-label="close"></a>
+                <div class="inner">
+                    <ul class="tabs">
+                        <li class="active"><a href="#" data-target="basic">Navigation basics</a></li>
+                        <li><a href="#" data-target="all">All controls</a></li>
+                    </ul>
+                    <div class="tabs-container" aria-hidden="true">
+                        <div class="tab active" data-tab="basic">
+                            <div class="tip">
+                                <div>
+                                    <i class="viewer-icon-refresh"></i>
+                                </div>
+                                <div>
+                                    <b>Orbit around</b>
+                                    <div>
+                                        Left click + drag or<br>
+                                        One finger drag (touch)
+                                    </div>
+                                </div>
+                            </div>
+                            <div class="tip">
+                                <div>
+                                    <i class="viewer-icon-search-plus"></i>
+                                </div>
+                                <div>
+                                    <b>Zoom</b>
+                                    <div>
+                                        Double click on model<br>
+                                        or scroll anywhere or<br>
+                                        Pinch (touch)
+                                    </div>
+                                </div>
+                            </div>
+                            <div class="tip">
+                                <div>
+                                    <i class="viewer-icon-arrows"></i>
+                                </div>
+                                <div>
+                                    <b>Pan</b>
+                                    <div>
+                                        Right click + drag or<br>
+                                        Two fingers drag (touch)
+                                    </div>
+                                </div>
+                            </div>
+                        </div>
+                        <div class="tab" data-tab="all">
+                            <div>
+                                <div class="section">
+                                    <span class="title">Orbit navigation</span>
+                                    <b>Move camera:</b> 1-finger drag or Left Mouse Button<br>
+                                    <b>Pan:</b> 2-finger drag or Right Mouse Button or <kbd>SHIFT</kbd>+ Left Mouse Button<br>
+                                    <b>Zoom on object:</b> Double-tap or Double-click on object<br>
+                                    <b>Zoom out:</b> Double-tap or Double-click on background<br>
+                                    <b>Zoom:</b> Pinch in/out or Mousewheel or <kbd>CTRL</kbd> + Left Mouse Button<br>
+                                </div>
+                                <div class="section rendering-shortcuts"></div>
+                                <div class="section inspector-shortcuts"></div>
+                                <div class="section general-shortcuts"></div>
+                                <div class="section">
+                                    <span class="title">Lighting</span>
+                                    <b>Rotate lighting:</b> 3-finger drag or <kbd>ALT</kbd> + Left Mouse Button<br>
+                                    <b>Rotate env. only:</b> <kbd>ALT</kbd> + <kbd>SHIFT</kbd> + Left Mouse Button<br>
+                                </div>
+                                <div class="section annotation-shortcuts"></div>
+                                <div class="section animation-shortcuts"></div>
+                                <div class="section sound-shortcuts"></div>
+                                <div class="section">
+                                   <span class="title">First-person navigation</span>
+                                   <b>Move:</b> <kbd>↑</kbd>,<kbd>←</kbd>,<kbd>↓</kbd>,<kbd>→</kbd> (or <kbd>W</kbd>,<kbd>A</kbd>,<kbd>S</kbd>,<kbd>D</kbd>)<br>
+                                   <b>Look around:</b> 1-finger drag or Left Mouse Button<br>
+                                   <b>Adjust speed:</b> Mousewheel<br>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+
+                    <div class="action">
+                        <button class="button" data-action="reset-camera">Reset camera view</button>
+                    </div>
+
+                </div>
+            </div>
+            <div class="overlay share hidden">
+                <a href="#" class="close viewer-icon-close" aria-label="close"></a>
+                <div class="inner">
+                    <div class="share-link">
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+                            <input id="copy-link-field" type="text" class="text" value="" readonly="">
+                            <button data-clipboard-target=".text-field .text">copy</button>
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+                    </div>
+                    <div class="share-embed">
+                        <a class="button" href="" target="_blank">
+                            <i class="viewer-icon-code"></i> Embed
+                        </a>
+                    </div>
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+            </div>
+            <div class="overlay hotspots-overlay hidden">
+                <a href="#" class="close viewer-icon-close" aria-label="close"></a>
+                <div class="inner">
+                    <span class="hotspot-title"></span>
+                    <div class="hotspot-content js-scrollable markdown-rendered-content"></div>
+                </div>
+            </div>
+            <div class="overlay ar ar-overlay-mobile hidden">
+                <i class="viewer-icon-close close"></i>
+                <div class="inner custom-scrollbar">
+                     <div class="header-helper">
+                        <p class="title">
+                        Your device is not compatible
+                        </p>
+                    </div>
+                    <div class="content-helper">
+                        <div class="row-helper">
+                            <div class="content-row">
+                                <div class="info">
+                                    <p>
+                                        Your version of
+                                        <span class="mobilePlatform"> </span>
+                                        is too old to display models in AR.
+                                    </p>
+                                    <p>
+                                        <span class="mobilePlatform"> </span>
+                                        <span class="minVersion"> </span>
+                                        or newer is required.
+                                    </p>
+                                    <p>
+                                        <strong>
+                                            Update your device or try on another device.
+                                        </strong>
+                                    </p>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            <div class="overlay ar ar-overlay-desktop hidden">
+                <i class="viewer-icon-close close"></i>
+                <div class="inner custom-scrollbar">
+                    <div class="header-helper">
+                        <p class="title">
+                            Augmented Reality is only available on mobile or tablet devices
+                        </p>
+                        <p class="subtitle">
+                            Supported devices: iPhone 6S+ &amp; iPad 5+ on iOS 12+ and Android 8.0+ with ARCore 1.9 support <br>
+                            Open this page with such a device to experience AR.
+                        </p>
+                    </div>
+                    <div class="content-helper">
+
+                        <div class="row-helper">
+                            <div class="content-row">
+                                <canvas id="qrCode"></canvas>
+                            </div>
+                        </div>
+
+                        <div class="row-helper ">
+                            <div class="content-row">
+                                <div class="text">
+
+                                    <p class="title">Open with QR Code:</p>
+                                    <p>Scan this code to open the model on your device, then, tap on the AR icon.</p>
+
+
+                                    <p class="title">Open this link with your mobile:</p>
+                                    <a class="url overlay-link" target="_blank" href="#" aria-label="Open AR on Mobile"></a>
+
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            <div class="overlay ar ar-overlay-loading hidden">
+                <i class="viewer-icon-close close"></i>
+                <div class="inner">
+                    <div class="sketchfab-spinner">
+
+<svg viewBox="0 0 13 16" xmlns="http://www.w3.org/2000/svg">
+    <g fill-rule="nonzero">
+        <path class="shape1" d="M5.3029 8.1731L0 4.9864v5.8286l5.3029 3.1867z"></path>
+        <path class="shape2" d="M5.9987 6.9902l5.8157-3.495L5.9987 0 .1829 3.4953z"></path>
+        <path class="shape3" d="M6.6944 8.1731v5.8286l5.303-3.1867V4.9864z"></path>
+    </g>
+</svg>
+
+                    </div>
+                    <div class="text">
+                        LOADING...
+                    </div>
+
+                        <div class="subText">
+                        If the loading takes too long, you can learn more
+                        <a class="overlay-link" href="https://support.fab.com/s/article/App-free-AR" target="_blank" rel="noopener noreferrer">here</a>
+                        </div>
+
+                </div>
+            </div>
+            <div class="overlay ar ar-overlay-error hidden">
+                <i class="viewer-icon-close close"></i>
+                <div class="inner">
+                    <div class="content-helper">
+                        <div class="row-helper">
+                            <div class="content-row">
+                                <div class="info">
+                                    <p>
+                                        AR is not available for this model yet.
+                                    </p>
+                                    <p>
+                                        Please try again later or contact us if the problem persists.
+                                    </p>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+            <div class="overlay helper-vr-overlay hidden">
+                <i class="viewer-icon-close close"></i>
+                <div class="inner custom-scrollbar">
+                     <div class="header-helper">
+                        To view this model in virtual reality:
+                    </div>
+                    <div class="content-helper">
+                        <div class="row-helper">
+                            <div class="content-row">
+                                <div class="image"><i class="viewer-icon-mobile"></i></div>
+                                <div class="text">
+                                    <div class="title">on mobile phone</div>
+                                    <div>with Cardboard or similar</div>
+                                </div>
+                            </div>
+                            <ul class="info">
+                                <li>On your mobile, open this <a class="url overlay-link" target="_blank" href="#">link</a></li>
+                            </ul>
+                        </div>
+                        <div class="row-helper">
+                            <div class="content-row">
+                                <div class="image"><i class="viewer-icon-desktop"></i></div>
+                                <div class="text">
+                                    <div class="title">on desktop PC </div>
+                                    <div>with a VR headset</div>
+                                </div>
+                            </div>
+                            <ul class="info">
+                                <li><a href="https://immersiveweb.dev/" target="_blank" rel="noopener noreferrer nofollow" class="overlay-link">Learn more on the immersive web</a></li>
+                                <li>On Chrome, follow the instructions <a href="https://immersiveweb.dev/chrome-support.html" target="_blank" rel="noopener noreferrer nofollow" class="overlay-link">here</a></li>
+                                <li>Open this model</li>
+                                <li>Click on the VR icon</li>
+                            </ul>
+                        </div>
+                    </div>
+                    <div class="footer-helper">
+                        <a class="overlay-link" href="https://support.fab.com/s/article/Virtual-Reality-VR" target="_blank" rel="noopener noreferrer">
+                        More info on Virtual Reality.
+                        </a>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="webgl">
+
+            <canvas class="canvas" data-modeluid="65937fd27de647c0a8ac99ce8275c03e" data-action="create-hotspot" aria-label="3D view of Arc de Triomphe - photogrammetry">
+            </canvas>
+
+            <div class="loading-container">
+                <div class="secondary-progress ">
+
+                    <div class="secondary-progress-percentage"></div>
+                    <div class="secondary-progress-display"></div>
+
+                </div>
+                <div class="main-progress ">
+                    <img alt="Loading 3D Model" src="https://media.sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/thumbnails/2a28add5c0ad45f58ab47c285fda9114/b5d188a8a6d54e119727d3617653c7e2.jpeg" class="loading-thumbnail">
+
+                    <div class="main-progress-wrapper">
+                        <div class="main-progress-percentage loading-percentage">0%</div>
+                        <p>Loading 3D model</p>
+                        <div class="main-progress-display">
+                            <div class="main-progress-display__progress"></div>
+                        </div>
+                    </div>
+
+                </div>
+            </div>
+
+            <div class="hotspots"></div>
+
+            <div class="gui">
+
+                <div class="animation-not-supported hidden">
+                    <a href="#" class="close" aria-label="close"></a>
+                    <p>Model is too heavy for your device and can not be rendered properly</p>
+                </div>
+
+
+                    <div class="hotspot-controls-responsive">
+                        <div data-title="Previous Annotation" data-action="prev-annotation">
+                            <div class="icon viewer-icon-caret-left"></div>
+                        </div>
+                        <div data-title="Next Annotation" data-action="next-annotation">
+                            <div class="icon viewer-icon-caret-right"></div>
+                        </div>
+                    </div>
+
+
+
+                    <div class="model-inspector">
+                        <div class="model-inspector__menu">
+                            <div class="model-inspector__minimize"><i class="viewer-icon-caret-down" aria-hidden="true"></i>Model Inspector</div>
+                            <div class="model-inspector__content">
+                                <div class="model-inspector__modes custom-scrollbar js-scrollable">
+
+                                </div>
+                            </div>
+                        </div>
+                        <div class="model-inspector__2D-options">
+                            <div class="model-inspector__UV-options"></div>
+                            <div class="model-inspector__material-options"></div>
+                        </div>
+                        <div class="model-inspector__empty-2d-view">
+                        </div>
+                    </div>
+
+
+
+                <div class="controls">
+
+
+        <div class="watermark">
+            <a title="View on Sketchfab" data-action="watermark" href="https://sketchfab.com/3d-models/arc-de-triomphe-photogrammetry-65937fd27de647c0a8ac99ce8275c03e" target="_blank"></a>
+        </div>
+
+
+
+
+
+
+                            <div class="animation-controls widget ">
+                                <div class="timeline ">
+                                    <div class="timeline-wrapper">
+                                        <div class="track">
+                                            <div class="bar">
+                                            </div>
+                                            <div class="knob">
+                                            </div>
+                                        </div>
+                                    </div>
+                                </div>
+                                <div class="animation-controls__buttons">
+                                    <a href="#" class="control play fa" aria-label="Play Animation"></a>
+                                    <a href="#" class="control next fa" aria-label="Next Animation"></a>
+                                    <div class="animation-timer control progress help" data-unit="time">00:00.00</div>
+                                    <div class="animation-list control has-menu">
+                                        <p class="animation-name"></p>
+                                        <div class="control-menu list">
+                                            <div class="animation__options">
+                                                <div class="toggle-button">
+                                                    <span class="toggle-button__option tooltip" data-tooltip="Repeat one">
+                                                        <input type="radio" name="animation-cycle" data-value="one" id="animation-cycle-one">
+                                                        <label for="animation-cycle-one"><i class="viewer-icon-cycle-repeat-one"></i></label>
+                                                    </span>
+                                                    <span class="toggle-button__option tooltip" data-tooltip="Repeat all">
+                                                        <input type="radio" name="animation-cycle" data-value="all" id="animation-cycle-all">
+                                                        <label for="animation-cycle-all"><i class="viewer-icon-cycle-repeat-all"></i></label>
+                                                    </span>
+                                                    <span class="toggle-button__option tooltip" data-tooltip="No repeat">
+                                                        <input type="radio" name="animation-cycle" data-value="none" id="animation-cycle-none">
+                                                        <label for="animation-cycle-none"><i class="viewer-icon-cycle-no-repeat"></i></label>
+                                                    </span>
+                                                </div>
+                                                <div class="toggle-button">
+                                                    <span class="toggle-button__option tooltip" data-tooltip="Speed x0.1">
+                                                        <input type="radio" name="animation-speed" data-value="0.1" id="animation-speed-point-one">
+                                                        <label for="animation-speed-point-one">x0.1</label>
+                                                    </span>
+                                                    <span class="toggle-button__option tooltip" data-tooltip="Speed x0.5">
+                                                        <input type="radio" name="animation-speed" data-value="0.5" id="animation-speed-point-five">
+                                                        <label for="animation-speed-point-five">x0.5</label>
+                                                    </span>
+                                                    <span class="toggle-button__option tooltip" data-tooltip="Speed x1">
+                                                        <input type="radio" name="animation-speed" data-value="1" id="animation-speed-one">
+                                                        <label for="animation-speed-one">x1</label>
+                                                    </span>
+                                                    <span class="toggle-button__option tooltip" data-tooltip="Speed x2">
+                                                        <input type="radio" name="animation-speed" data-value="2" id="animation-speed-two">
+                                                        <label for="animation-speed-two">x2</label>
+                                                    </span>
+                                                </div>
+                                            </div>
+                                            <ul class="js-scrollable"></ul>
+                                        </div>
+                                    </div>
+                                </div>
+                            </div>
+
+
+
+                            <div class="hotspot-controls widget has-menu ">
+
+                                <div data-title="Previous Annotation" data-action="prev-annotation">
+                                    <div class="icon viewer-icon-caret-left"></div>
+                                </div>
+
+                                <div class="hotspot-name default" data-action="toggle-annotation-list">
+                                    Select an annotation
+                                </div>
+
+                                <div data-title="Next Annotation" data-action="next-annotation">
+                                    <div class="icon viewer-icon-caret-right"></div>
+                                </div>
+
+                                <div class="list hotspots-list"></div>
+
+                            </div>
+
+
+                            <div class="general-controls widget ">
+
+
+
+                                    <a class="control tooltip help" data-tooltip="Help">
+                                        <i class="viewer-icon-question"></i>
+                                    </a>
+
+
+                                    <a class="control volume" title="Volume (M)" draggable="false">
+                                        <i class="viewer-icon-volume-up"></i>
+                                        <div class="volume-menu">
+                                        </div>
+                                    </a>
+
+
+                                    <a class="control tooltip settings has-menu " data-tooltip="Settings">
+                                        <i class="viewer-icon-gear"></i>
+                                        <div class="control-menu settings-menu">
+                                            <div class="control-menu-wrapper">
+                                                <div class="control-menu-list"></div>
+                                                <div class="control-menu-pane"></div>
+                                            </div>
+                                        </div>
+                                        <span class="control-badge"></span>
+                                    </a>
+
+
+                                    <a class="control tooltip inspector" data-tooltip="Model Inspector (i)" data-action="inspector">
+                                        <i class="viewer-icon-inspector"></i>
+                                    </a>
+
+
+
+                                    <a class="control tooltip vr " data-tooltip="View in VR">
+                                        <i class="viewer-icon-vr"></i>
+                                    </a>
+
+
+
+                                    <a class="control tooltip tooltip-right-bound fullscreen --always-visible" data-tooltip="Fullscreen (f)">
+                                        <i class="viewer-icon-fullscreen"></i>
+                                    </a>
+
+
+                            </div>
+
+                </div>
+
+
+
+                <div class="viewer-hint widget disabled">
+                    <div class="viewer-movehint">
+                        <i class="icon"></i>
+                        <span class="label"></span>
+                    </div>
+                </div>
+
+            </div>
+
+        </div>
+
+        <div class="osd widget">
+            <div class="osd-content">
+            </div>
+        </div>
+
+        <div class="fallback" style="display: none">
+
+            <div class="fallback-viewport">
+                <img src="" alt="Arc de Triomphe - photogrammetry 3D Model" class="fallback-sprite">
+            </div>
+
+            <div class="fallback-warning">
+                <div class="inner">
+                    <h3>Arc de Triomphe - photogrammetry 3D Model</h3>
+                    <p data-nosnippet="">
+                        Something went wrong with the 3D viewer.<br>
+                        <a href="https://support.fab.com/s/article/Compatibility" target="_blank" rel="noopener noreferrer">Learn how to fix it here</a>.
+                    </p>
+                </div>
+            </div>
+
+            <div data-nosnippet="" class="fallback-error fallback-error-loading">
+                <div class="inner">
+                    <p>Connection error. Please try again.</p>
+                </div>
+            </div>
+
+            <div data-nosnippet="" class="fallback-error fallback-error-nofallback">
+                <div class="inner">
+                    <p>Sorry, the model can't be displayed.</p>
+                    <p>Please check out <a href="https://support.fab.com/s/article/Compatibility" target="_blank" rel="noopener noreferrer">our FAQ</a> to learn how to fix this issue.</p>
+                </div>
+            </div>
+
+            <div class="progress-bar">
+                <div class="progress-bar-percentage"></div>
+                <div class="progress-bar-display"></div>
+            </div>
+
+            <div class="progress-circle">
+                <div class="progress-circle-percentage loading-percentage"></div>
+                <svg class="progress-circle-display" version="1.1">
+                    <path class="progress-circle-path" fill="none" stroke="#1caad9" stroke-width="6"></path>
+                </svg>
+            </div>
+
+
+                <div class="controls">
+                    <div class="control control-fullscreen fullscreen tooltip tooltip-left" data-tooltip="Fullscreen (f)" data-action="fullscreen">
+                        <div class="icon viewer-icon-fullscreen"></div>
+                    </div>
+                </div>
+
+
+        </div>
+
+        <div data-nosnippet="" class="embed-sandboxed-message">
+            <p>It looks like your browser or this site is blocking some scripts or cookies necessary to properly display the viewer.</p>
+            <p>View this model on Sketchfab :<br><a href="https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed">https://sketchfab.com/models/65937fd27de647c0a8ac99ce8275c03e/embed</a></p>
+            <p>Or visit the Help Center for more information:<br><a href="https://support.fab.com/s/article/Compatibility" target="_blank" rel="noopener noreferrer">https://support.fab.com/s/article/Compatibility</a></p>
+        </div>
+    </main>
+
 
 # Key Benefits