This can be useful: https://en.wikipedia.org/wiki/Fast_inverse_square_root https://en.wikipedia.org/wiki/Fast_inverse_square_root https://www.youtube.com/watch?

This can be useful: https://en.wikipedia.org/wiki/Fast_inverse_square_root https://en.wikipedia.org/wiki/Fast_inverse_square_root https://www.youtube.com/watch?v=p8u_k2LIZyo https://www.youtube.com/watch?v=p8u_k2LIZyo