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The read-only XRViewerPose
property views
returns an array which contains every XRView
which must be rendered in order to fully represent the scene from the viewpoint defined by the viewer pose. For monoscopic devices, this array contains a single view.
Important: There is no guarantee that the number of views will remain constant over the lifetime of an XRSession
. For each frame, you should always use the current length of this array rather than caching the value.
Stereo views require two views to render properly, with the left eye's view having its eye
set to the string left
and the right eye's view a value of right
.
Syntax
let viewList = xrViewerPose.views;
Value
An array of XRView
objects, one for each view available as part of the scene for the current viewer pose. This array's length may potentially vary over the lifetime of the XRSession
(for example, if the viewer enables or disables stereo mode on their XR output device).
Examples
In this example—part of the code to render an XRFrame
, getViewerPose()
is called to get an XRViewerPose
using the same reference space the code is using as its base reference space. If a valid pose is returned, the frame is rendered by clearing the backbuffer and then rendering each of the views in the pose; these are most likely the views for the left and right eyes.
let pose = frame.getViewerPose(xrReferenceSpace);
if (pose) {
let glLayer = xrSession.renderState.baseLayer;
gl.bindFrameBuffer(gl.FRAMEBUFFER, glLayer.framebuffer);
gl.clearColor(0, 0, 0, 1);
gl.clearDepth(1);
gl.clear(gl.COLOR_BUFFER_BIT, gl.DEPTH_BUFFER_BIT);
for (let view of pose.views) {
let viewport = glLayer.getViewport(view);
gl.viewport(viewport.x, viewport.y, viewport.width, viewport.height);
/* render the scene for the eye view.eye */
}
}
Passing each view
to getViewport()
returns the WebGL viewport to apply in order to cause the rendered output to be positioned correctly in the framebuffer for renderijng to the corresponding eye on the output device.
This code is derived from Drawing a frame in Movement, orientation, and motion: A WebXR example. You can see more context and see much more on that page.
Specifications
Specification | Status | Comment |
WebXR Device APIThe definition of 'XRViewerPose.views' in that specification. | Working Draft | Initial definition. |
Browser compatibility
The compatibility table in 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.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
views
|
Chrome
Full support 79 |
Edge
Full support 79 |
Firefox
No support No |
IE
No support No |
Opera
No support No |
Safari
No support No |
WebView Android
No support No |
Chrome Android
Full support 79 |
Firefox Android
No support No |
Opera Android
No support No |
Safari iOS
No support No |
Samsung Internet Android
Full support 11.2 |
Legend
- Full support
- Full support
- No support
- No support
See also
XRViewerPose.views by Mozilla Contributors is licensed under CC-BY-SA 2.5.