在AR中.js加载模型时，显示加载屏幕

当我们加载大型3D模型或大型视频时，加载资产(资源(并渲染资源需要时间，因此我想显示加载屏幕或加载gif文件或加载A框 - 直到整个资产加载和渲染完成，在屏幕上或图案上。它可以工作，但加载和渲染需要 10-15 秒。

我尝试添加资产加载管理器，但它不起作用。我尝试了所有方法，但没有奏效

<!DOCTYPE html>
<html lang="en">
   <head>
      <title>Hello!</title>
      <meta charset="utf-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <script type="text/javascript" src="https://aframe.io/releases/0.8.2/aframe.min.js"></script>
      <script type="text/javascript" src="https://cdn.rawgit.com/jeromeetienne/AR.js/1.7.2/aframe/build/aframe-ar.min.js"></script>
      <script type="text/javascript" src="https://cdn.rawgit.com/donmccurdy/aframe-extras/v6.0.0/dist/aframe-extras.min.js"></script>
      <script src="https://unpkg.com/aframe-animation-component@5.1.2/dist/aframe-animation-component.min.js"></script>
   </head>
   <body>
      <a-scene vr-mode-ui="enabled: false" artoolkit='sourceType: webcam; detectionMode: mono; maxDetectionRate: 90;' arjs='debugUIEnabled: false;detectionMode: mono_and_matrix; matrixCodeType: 3x3;'>
         <a-assets>
            <a-entity src="https://cdn.glitch.com/a5ca03d3-3024-44dc-9256-0b75c4247613%2Fscene.gltf?v=1563255364433" id="model"></a-entity>
         </a-assets>
         <a-marker preset="hiro">
            <a-entity  gltf-model="#model" material='transparent:true;shader:flat;side:double;metelness:2' scale="0.04 0.04 0.04" ></a-entity>
         </a-marker>
         <a-entity camera></a-entity>
         <a-entity shadow="cast: true"></a-entity>
      </a-scene>
      <script>
         // Workaround for an AR.js bug (https://github.com/jeromeetienne/AR.js/issues/410)
         const sceneEl = document.querySelector('a-scene');
         sceneEl.addEventListener('loaded', () => {
           sceneEl.camera = new THREE.PerspectiveCamera();
           scene.add( camera );
         });
      </script>
   </body>
</html>

显示 HIRO 模式后，加载和渲染需要 10-15 秒(取决于互联网速度(。我想显示一些预加载器或加载屏幕或一些 gif 加载图像以显示，直到对象(资产(完全加载并在渲染和加载完成后渲染和消失......

提前致谢

对于模型，可以使用 model-loaded 事件：

<a-marker preset="hiro">
   <a-entity id='loadingEl'></a-entity>
   <a-entity gltf-model="#model"></a-entity>
</a-marker>

#loadingEl可能有一个带有"加载"图像的基元框，加载模型时，您可以删除(实体或其可见性(：

AFRAME.registerComponent('foo', {
   init: function() {
      this.el.addEventListener('model-loaded', e => {
          document.querySelector("#loadingEl").remove()
      })
   }
})

这里的故障。

<a-assets>系统发出loaded事件，您也可以将其用于视频。

这是对雅利安故障的修复，请使用 Hiro 标记和您的 3D 模型 - 故障

<!DOCTYPE html>
<html lang="en">
   <head>
      <title>Hello!</title>
      <meta charset="utf-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <script type="text/javascript" src="https://aframe.io/releases/0.8.2/aframe.min.js"></script>
      <script type="text/javascript" src="https://cdn.rawgit.com/jeromeetienne/AR.js/1.7.2/aframe/build/aframe-ar.min.js"></script>
      <script type="text/javascript" src="https://cdn.rawgit.com/donmccurdy/aframe-extras/v6.0.0/dist/aframe-extras.min.js"></script>
      <script src="https://unpkg.com/aframe-animation-component@5.1.2/dist/aframe-animation-component.min.js"></script>
     <script>
     AFRAME.registerComponent('loader', {
       init: function() {
         let loader = document.querySelector("#loadingEl")
         this.el.addEventListener('model-loaded', e => {
           console.log('loaded')
           loader.setAttribute("visible", "false")
         })
       }
     })
     </script>
   </head>
   <body>
      <a-scene vr-mode-ui="enabled: false" artoolkit='sourceType: webcam; detectionMode: mono; maxDetectionRate: 90;' arjs='debugUIEnabled: false;detectionMode: mono_and_matrix; matrixCodeType: 3x3;'>
         <a-assets>
            <a-entity src="https://cdn.glitch.com/a5ca03d3-3024-44dc-9256-0b75c4247613%2Fscene.gltf" id="model"></a-entity>
         </a-assets>
         <a-marker preset="hiro">
            <a-box id="loadingEl"></a-box>
            <a-entity gltf-model="#model" material='transparent:true;shader:flat;side:double;metelness:2' scale="0.04 0.04 0.04" loader></a-entity>
         </a-marker>
         <a-entity camera></a-entity>
         <a-entity shadow="cast: true"></a-entity>
      </a-scene>
      <script>
         // Workaround for an AR.js bug (https://github.com/jeromeetienne/AR.js/issues/410)
         const sceneEl = document.querySelector('a-scene');
         sceneEl.addEventListener('loaded', () => {
           sceneEl.camera = new THREE.PerspectiveCamera();
           scene.add( camera );
         });
      </script>
   </body>
</html>

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