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I'm guessing the infamous inverse square root algorithm was used originally for ray-casting described in the article?

Fast Inverse Square Root: https://news.ycombinator.com/item?id=24959157

Excellent article btw.

Fast inverse square root was part of the lighting calculations in Quake III IIRC. Nothing so obtuse is required for the simple ray-casting demonstrated here.

this project is a pseudo-remake of Wolfenstein 3-D; Fast Inverse Square Root as we know it wasn't in an id game until much later with Quake III Arena

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