Is the execution of renderer.render() synchronous or asynchronous?

In my quest to capture a screenshot after each rendered frame, I have noticed some duplicates. This has led me to suspect that I may be saving the screenshot before the rendering process is fully completed. Therefore...

  1. Is it possible for renderer.render() to pause until the rendering is complete?
  2. If not, is there a method to be notified through a callback or event when the rendering has finished?

Answer №1

I conducted a rendering experiment using 50,000 cubes, which takes around 6-10 seconds on my laptop.

If you're interested, you can view the fiddle here: http://jsfiddle.net/1ma18gLf/

The function blocks based on the test. To observe the result and view the base64 image, utilize the browser console.

This leads us to the question: does webGL paint to the canvas independently of JavaScript activities?

You may want to attempt manually clearing before rendering:

var renderer = new THREE.WebGLRenderer( { preserveDrawingBuffer: true } );
renderer.autoClear = false;

//Within your rendering loop:

renderer.clear();
renderer.render( scene, camera );

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