I have been pondering the way in which three.js handles rendering. It seems to me that it converts each element into an image before drawing it on a context. I'm curious if there are resources available where I can learn more about this process. Additionally, if my understanding is correct, I wonder if there is a way to access and manipulate those images.
Any information on this topic would be greatly appreciated.
Within Three.js lies an internal representation of the 3D scene, encompassing vertices, materials, and more. The process of rendering involves translating this 3D depiction into a 2D space. Three.js offers various renderers, such as the popular WebGLRenderer, CanvasRenderer, and CSS3DRenderer.
<canvas>.(This explanation is a simplification of the process.)
It's vital to note that the frame produced by WebGL and Canvas renderings is the final image displayed on the screen, not an <img>. Typically, browsers render 60 frames per second, and extracting a frame can be achieved by converting the <canvas> into an image. Pausing the animation loop is recommended for accurate frame capture. While capturing frames this way is slow due to the rapid rendering rate of browsers, tools like Chrome's canvas inspection tools offer a closer look at each painted frame.
While intercepting the buffer during Three.js frame rendering is challenging, drawing directly onto the canvas is feasible. The graphics context, accessed through renderer.context from the Renderer instance in your Three.js scene setup, aids in assembling the frame buffer.
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