In its simplest definition, a shader is a computer program that usually runs on the GPU to tell each and every pixel how they should look like in the game. Shaders are the secret sauce that make a game look apart from the rest, by dictating and manipulating how the art assets should look like in the game.
Shaders tell the GPU how to render all those art assets into the screen, and saying how should the light behave on the surface of the 3D objects, what colour should they be in, and a whole other details.
A loose representation of how the 3D models that you see in your game, are made and drawn on the screen can be seen by the following diagram:
You can download the shader if you want a better game. You can also buy POE currency for a better gaming experience.
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