I was the QA Lead for Grapics on WarCraft3. This was Blizzards first 3D game and the early engine was very error prone but with the meticulous attention to detail and the sheer amount of time we spent polishing. This game turned out flawless for its time. Early on there were many models that would glitch and there was a massive artifact issue that would happen in multiplayer games. I’m sure the developers found it very frustrating but we fixed it! The solution was hand crafted per model every time. There were ~800 bugs in graphics.