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  3. PositionSensorVRDevice

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过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

PositionSensorVRDevice 接口在 WebVR API represents VR hardware's position sensor. You can access information such as the current position and orientation of the sensor in relation to the head mounted display through the PositionSensorVRDevice.getState() 方法。

方法

PositionSensorVRDevice.getState()
Returns the current state of the position sensor for the current frame (e.g. within the current window.requestAnimationFrame callback) or for the previous frame, contained with a VRPositionState object. This is the method you'd normally want to use, versus getImmediateState() .
PositionSensorVRDevice.getImmediateState()

Returns the current instantaneous position sensor state. This is intended to only be used rarely, for certain special uses, for example sampling the immediate position of a hand orientation sensor — or at least it will be, in the future.

PositionSensorVRDevice.resetSensor()
Can be used to reset the sensor if desired, returning the position and orientation values to zero.

特性

This interface doesn't define any properties of its own, but it does inherit the properties of its parent interface, VRDevice .

VRDevice.hardwareUnitId 只读
Returns the distinct hardware ID for the overall hardware unit that this VRDevice is a part of. All devices that are part of the same physical piece of hardware will have the same hardwareUnitId .
VRDevice.deviceId 只读
Returns the ID for this specific VRDevice . The ID shouldn’t change across browser restarts, allowing configuration data to be saved based on it.
VRDevice.deviceName 只读
A human-readable name to identify the VRDevice .

范例

The following example is taken from our positionsensorvrdevice demo, which uses the WebVR API to update the view of a simple 2D canvas scene on each frame of a requestAnimationFrame 循环。 

function setView() {
  var posState = gPositionSensor.getState();
  if(posState.hasPosition) {
    posPara.textContent = 'Position: x' + roundToTwo(posState.position.x) + " y"
                                + roundToTwo(posState.position.y) + " z"
                                + roundToTwo(posState.position.z);
    xPos = -posState.position.x * WIDTH * 2;
    yPos = posState.position.y * HEIGHT * 2;
    if(-posState.position.z > 0.01) {
      zPos = -posState.position.z;
    } else {
      zPos = 0.01;
    }
  }
  if(posState.hasOrientation) {
    orientPara.textContent = 'Orientation: x' + roundToTwo(posState.orientation.x) + " y"
                                + roundToTwo(posState.orientation.y) + " z"
                                + roundToTwo(posState.orientation.z);
    xOrient = posState.orientation.x * WIDTH;
    yOrient = -posState.orientation.y * HEIGHT * 2;
    zOrient = posState.orientation.z * 180;
  }
}

Here we are grabbing a VRPositionState 对象使用 PositionSensorVRDevice.getState() and storing it in posState . We then check to make sure that position and orientation info is present in the current frame using VRPositionState.hasPosition and VRPositionState.hasOrientation (these return null if, for example the head mounted display is turned off or not pointing at the position sensor, which would cause an error.)

We then output the x, y and z position and orientation values for informational purposes, and use those values to update the xPos , yPos , zPos, xOrient , yOrient ，和 zOrient variables, which are used to update the scene rendering on each frame.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据
桌面 移动
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
PositionSensorVRDevice 弃用 非标 Chrome Yes
Yes
The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out Bringing VR to Chrome by Brandon Jones.
Edge 79
79
The support in Edge is currently experimental. To find information on Edge's WebVR implementation status including supporting builds, check out Bringing VR to Edge by Brandon Jones.
Firefox 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
IE No Opera No Safari No WebView Android No Chrome Android No Firefox Android 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment .
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
44
dom.vr* prefs are enabled by default at this point, in Nightly/Aurora editions.
Opera Android No Safari iOS No Samsung Internet Android No
getImmediateState 弃用 非标 Chrome Yes
Yes
The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out Bringing VR to Chrome by Brandon Jones.
Edge 79
79
The support in Edge is currently experimental. To find information on Edge's WebVR implementation status including supporting builds, check out Bringing VR to Edge by Brandon Jones.
Firefox 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
IE No Opera No Safari No WebView Android No Chrome Android No Firefox Android 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment .
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
44
dom.vr* prefs are enabled by default at this point, in Nightly/Aurora editions.
Opera Android No Safari iOS No Samsung Internet Android No
getState 弃用 非标 Chrome Yes
Yes
The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out Bringing VR to Chrome by Brandon Jones.
Edge 79
79
The support in Edge is currently experimental. To find information on Edge's WebVR implementation status including supporting builds, check out Bringing VR to Edge by Brandon Jones.
Firefox 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
IE No Opera No Safari No WebView Android No Chrome Android No Firefox Android 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment .
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
44
dom.vr* prefs are enabled by default at this point, in Nightly/Aurora editions.
Opera Android No Safari iOS No Samsung Internet Android No
resetSensor 弃用 非标 Chrome Yes
Yes
The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out Bringing VR to Chrome by Brandon Jones.
Edge 79
79
The support in Edge is currently experimental. To find information on Edge's WebVR implementation status including supporting builds, check out Bringing VR to Edge by Brandon Jones.
Firefox 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
IE No Opera No Safari No WebView Android No Chrome Android No Firefox Android 39 Disabled
39 Disabled
The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment .
Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.
44
dom.vr* prefs are enabled by default at this point, in Nightly/Aurora editions.
Opera Android No Safari iOS No Samsung Internet Android No

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。

非标。预期跨浏览器支持较差。

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

元数据

  • 最后修改：
  1. WebVR API
  2. PositionSensorVRDevice
  3. 方法
    1. getImmediateState()
    2. getState()
    3. resetSensor()
  4. 继承：
    1. VRDevice
  5. Related pages for WebVR API
    1. Gamepad.displayId
    2. Navigator.activeVRDisplays
    3. Navigator.getVRDisplays()
    4. VRDisplay
    5. VRDisplayCapabilities
    6. VRDisplayEvent
    7. VREyeParameters
    8. VRFieldOfView
    9. VRFrameData
    10. VRLayerInit
    11. VRPose
    12. VRStageParameters

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