This example recreates a popular demo effect known as meta balls/blobs. The scene is calculated by working out the amount of energy that each pixel receives from the surround 'blobs' or lights. The more lights the more work each pixel has to be do.
So if you did all the work (calc the distance etc) in the inner most loops, you’d get a pretty heavy per pixel calculation. Such a loop would run slowly even in assembly/machine code. So what we need to do is come up with some ways we can simplify the inner loop to get the cost per pixel down as much as possible.
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