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Learning Three.js – the JavaScript 3D Library for WebGL - Second Edition by Jos Dirksen

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Creating custom postprocessing shaders

In this section, you'll learn how to create a custom shader that you can use in postprocessing. We'll create two different shaders. The first one will convert the current image into a grayscale image, and the second one will convert the image into an 8-bit image by reducing the number of colors that are available. Note that creating vertex and fragment shaders is a very broad subject. In this section, we only touch the surface of what can be done by these shaders and how they work. For more in-depth information, you can find the WebGL specification at http://www.khronos.org/webgl/. An additional good resource full of examples is Shadertoy at https://www.shadertoy.com/.

Custom grayscale shader

To create a

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