Different approach for transmitting webgl context as binary information without relying on gl.readPixels

I developed a unique setup where two HTML clients are able to communicate with each other using a websocket server. One client utilizes Three.js to draw a 3D model on its canvas and then transmits the webGl canvas context as binary data to the other client through the websocket server.

However, I have encountered an issue with the readPixels() method being too slow for my needs. Ensuring that this streaming process is smooth and seamless is essential.

function animate() {

    requestAnimationFrame( animate );

    render();

    var ctx = renderer.getContext();        

    var byteArray = new Uint8Array(1280 * 720 * 4);

    ctx.readPixels(0,0,1280, 720, ctx.RGBA, ctx.UNSIGNED_BYTE, byteArray);

    socket.send(byteArray.buffer);

}

The 'renderer' mentioned in the code is a THREE.WebGLRenderer.

Any insights or recommendations on how to optimize this process?

EDIT:

If you're interested, here is the base code I used for implementing the 3D drawing: link

Answer №1

One potential solution is to utilize the canvas.toDataURL("image/jpg"); (or png) method to extract the image data from a WebGL context. This approach has been known to be a dependable method for capturing image data. While I have primarily used it for taking screenshots, I cannot definitively comment on its performance compared to readPixels.

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