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Overview Shaders are everywhere, but these days you rarely have to write them yourself. Game engines come with a multitude of shaders which do everything from moving objects, scaling and rotating them, to coloring and texturing them, calculating lighting (perhaps using a physically-based rendering approach), and applying post-processing effects like bloom or HDR. But sometimes these built-in features are not enough: perhaps you’re going for a certain lighting aesthetic, want to create a unqiue special effect, or just need to improve the rendering performance....