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The WebXR API's enumerated type XREnvironmentBlendMode defines strings used to identify if and how to blend the rendered virtual content with the real world. Its values are used by the XRSession 接口的 environmentBlendMode 特性。

值

opaque
The rendered image is drawn without allowing any pass-through imagery. This is primarily used by fully-immersive VR headsets, which totally obscure the surrounding environment, with none of the real world shown to the user at all. The alpha values specified in the XRSession 's renderState property's baseLayer field are ignored since the alpha values for the rendered imagery are all treated as being 1.0 (fully opaque).
additive
Primarily used by AR devices with transparent lenses which directly allow reality to pass through to the user's eyes, the additive blending mode is designed to be used in a situation in which the device has no control over the background and its brightness, since that isn't being digitally controlled. All the device can do is add more light to the image; it can't make things get darker. Therefore, black is rendered as fully transparent, and there's no way to make a pixel fully opaque. As with the opaque setting, alpha values specified are ignored and treated as if they were 1.0.
alpha-blend

Used by headsets or goggles which use cameras to capture the real world and display it digitally on the screen or screens used to render the content for the user to see, this offers a way to create an AR presentation using a VR device. Alpha blending can also be used by non-wearable devices that provide AR modes, such as phones or tablets using cameras to capture the real world for use in AR apps. Since the real world is being digitally presented, the brightness of each pixel can be controlled, whether it's reality or the rendered XR image, the user's environment can be blended with the virtual environment with each pixel having its color and brightness precisely controlled.

In this mode, the XRSession 's renderState.baseLayer property provides relative weights of the artificial layer during the compositing process. Pixels whose alpha value is 1.0 are rendered fully opaque, totally obscuring the real world, while pixels with an alpha of 1.0 are totally transparent, leaving the surrounding environment to pass through.

规范

规范 状态 注释
WebXR Augmented Reality Module
The definition of 'XREnvironmentBlendMode' in that specification. 		编者草案 初始定义。

浏览器兼容性

更新 GitHub 上的兼容性数据
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Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
XREnvironmentBlendMode Chrome 79 Edge 79 Firefox No IE No Opera No Safari No WebView Android 79 Chrome Android 79 Firefox Android No Opera Android No Safari iOS No Samsung Internet Android 11.2
additive Chrome 79 Edge 79 Firefox No IE No Opera No Safari No WebView Android 79 Chrome Android 79 Firefox Android No Opera Android No Safari iOS No Samsung Internet Android 11.2
alpha-blend Chrome 79 Edge 79 Firefox No IE No Opera No Safari No WebView Android 79 Chrome Android 79 Firefox Android No Opera Android No Safari iOS No Samsung Internet Android 11.2
opaque Chrome 79 Edge 79 Firefox No IE No Opera No Safari No WebView Android 79 Chrome Android 79 Firefox Android No Opera Android No Safari iOS No Samsung Internet Android 11.2

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

元数据

  • 最后修改：
  1. WebXR 设备 API
  2. XREnvironmentBlendMode
  3. Related pages for WebXR Device API
    1. Navigator.xr
    2. WebGLRenderingContext.makeXRCompatible()
    3. XR
    4. XRBoundedReferenceSpace
    5. XRFrame
    6. XRInputSource
    7. XRInputSourceArray
    8. XRInputSourceEvent
    9. XRInputSourcesChangeEvent
    10. XRPose
    11. XRReferenceSpace
    12. XRReferenceSpaceEvent
    13. XRRenderState
    14. XRRigidTransform
    15. XRSession
    16. XRSessionEvent
    17. XRSpace
    18. XRView
    19. XRViewerPose
    20. XRViewport
    21. XRWebGLLayer