VRDisplay.requestAnimationFrame()
Experimental: 这是一个实验中的功能
此功能某些浏览器尚在开发中,请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订,所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
The requestAnimationFrame()
method of the VRDisplay
interface is a special implementation of Window.requestAnimationFrame
containing a callback function that will be called every time a new frame of the VRDisplay
presentation is rendered:
- When the
VRDisplay
is not presenting a scene, this is functionally equivalent toWindow.requestAnimationFrame
. - When the VRDisplay is presenting, the callback is called at the native refresh rate of the
VRDisplay
.
Syntax
var handle = vrDisplayInstance.requestAnimationFrame(callback);
Parameters
- callback
-
A callback function that will be called every time a new frame of the
VRDisplay
presentation is rendered.
Return value
A long representing the handle of the requestAnimationFrame()
call. This can then be passed to a VRDisplay.cancelAnimationFrame()
(en-US) call to unregister the callback.
Examples
TBD.
Specifications
该 API 在旧的 WebVR API(已被 WebXR Device API 取代)中定义。它不再有望成为标准。
在所有浏览器都实现新的 WebXR API (en-US) 之前,建议使用框架(如:A-Frame、Babylon.js 或 Three.js)或 polyfill 来开发适用于所有浏览器的 WebXR 应用程序。[1]
Browser compatibility
BCD tables only load in the browser
See also
- WebVR API homepage.
- MozVr.com — demos, downloads, and other resources from the Mozilla VR team.