4 ms·

I think you mean quakes fast inverse square root? Not aware doom had a clever sqrt routine, but I would be happy to be wrong!

• intelVISA 4y ago
  obligatory //what the fuck?
• pjscott 4y ago
  You’re right. Doom used fixed-point math; at the time, hardware floating-point units were far from ubiquitous on the computers people wanted to use to play it.