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A shader is a computer program that is used to do shading, texturing, special effects or post-processing. Shader nodes specifically refer to the nodes used to create shaders for Cycles, but this tag can be used for other shaders as well.

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Can I access the render screen size in a custom filter 2D in the game engine?

All the game properties stored in the object that calls the Filter 2D are passed to the shader as uniforms. So if you have a width and a height float game properties you can set their values at run-ti …
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