ShaderToy Tutorial Part 3 - Making a Rectangle

Third installment of the ShaderToy tutorial series. This time we'll put the smiley face into its own function and then move on to another shape: a Rectangle.

Previous Part: https://www.youtube.com/watch?v=GgGBR4z8C9o

Next Part: https://www.youtube.com/watch?v=jKuXA0trQPE&feature=youtu.be

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