To understand how this keyword works, we have to look closely at how early Internet Protocol (IP) cameras served video streams to web browsers. In the early 2000s, video streaming over the web was not standardized. Instead of modern HTML5 video elements, legacy devices used custom server-side scripts, sub-pages, and basic HTTP refresh mechanisms to display images. Here is what each component of the URL string means:
Tells the web server to send a new JPEG frame and then refresh the page.
This specific parameter tells the camera's server to serve a continuously refreshing JPEG stream rather than a single static image or a Java-based applet. viewerframe mode refresh top
If you are trying to refresh only the "top" portion of a frame, developers often use method to target a specific div or container, which prevents the whole page from flickering.
Solution: You must use the postMessage API to "ask" the parent window to refresh itself. To understand how this keyword works, we have
or ViewerFrame? : This is the specific endpoint or filename of the web page hosted directly on the camera's internal web server. It tells the web interface to load the template structure or iframe that holds the camera feed.
// Usage const myViewer = new ViewerFrame(renderer, scene); myViewer.setMode('live'); myViewer.refreshTop(); // Executes the "viewerframe mode refresh top" logic Here is what each component of the URL
The UI layer slips behind the 3D model geometry.