<xr-scene ar-system="modes:Marker" id="xr-scene" >
  <xr-asset-load type="gltf" asset-id="night_car_landscape" src="https://mmbizwxaminiprogram-1258344707.cos.ap-guangzhou.myqcloud.com/xr-frame/demo/night_car_landscape.glb" />
  <xr-asset-post-process asset-id="bloom" type="bloom" is-hdr data="radius: 64, intensity: 1, threshold: 0.5, softThreshold: 0.3" />
  <xr-ar-tracker mode="Marker" src="/Assets/1.jpg">
    <xr-gltf node-id="gltf_1" position="0 0 0" rotation="-90 0 0" scale="0.005 0.005 0.005" model="night_car_landscape"></xr-gltf>
  </xr-ar-tracker>
  <xr-camera clear-color="0 0 0 1" background="ar" is-ar-camera post-process="bloom"></xr-camera>
</xr-scene>



1: ar模式中 bloom 开启 is-hdr 会花屏
2: ar模式中 bloom 开启 会让摄像机看到的实景画面曝光严重.