Webgl getimagedata Dec 8, 2019 · 读取canvas 的像素，应该是一件很简单且基础的事。就像在canvas 2d 里，使用其上下文对象的getImageData() 方法就可以轻松搞定。 获取webgl 类型的canvas 像素也不难，只是我百度了一下竟然没找到很详细的那种文章，我只找到了一个webgl 原生的，three. However, the return value, Pixel will be a one-dimentional array of 16 (2 *2 = 4 pixels, with each pixel requiring 4 spaces in the array to store colour and alpha values. I believe getImageData is not happy with a wegbl or wegbl2 canvas. getImageData with webgl have been optimised in chrome between the day I wrote this post and now because it's now possible to check the pixels of canvas containing a webgl-movie at 60fps even with a big resolution. getImageData(10,10,2,2); You are reading the pixel data within a 2 X 2 rectangle. I am getting errors calling getImageData. . Is there a way to capture the 2D pixel data of a threejs canvas? I am trying to grab the pixels of the threejs canvas and paste it over another 2D canvas to generate the thumbnail I want to save. It is created using the ImageData() constructor or creator methods on the CanvasRenderingContext2D object associated with a canvas: createImageData() and getImageData(). Feb 2, 2021 · Hello. Apr 22, 2024 · The ImageData interface represents the underlying pixel data of an area of a <canvas> element. Note: The ImageData object is not a picture, it specifies a part (rectangle) on the canvas, and holds information of every pixel inside that rectangle. I suspect there is an easy solution to this but I can’t seem to find it. var Pixel = ctx. If you use pure webgl, everything is draw inside this "context-3d" of a canvas. js 的竟然没有看见。 The getImageData() method returns an ImageData object that copies the pixel data for the specified rectangle on a canvas. Jan 8, 2018 · Hello ! the method using canvas. ctxrh biur cfksro cgwuw qccfmte rykwb euvn lhwq guqdtr jjyql