Finally found the invisible monster bug — Wayward Terran Frontier: Zero Falls Steam update #886617

Sorry for the rapid series of bug filled updates. Here's what happened: I for the life of me could not figure out why the monsters would sometimes go invisible. So I wrote code that would try really hard to render them even if their animation was in a corrupted state. The new code immediately produced crashes without crash logs in version 0.9.3.01 and so in 0.9.3.02 I updated the code to catch those crashes with a proper crash log and also improved my rendering without art code....which immediately crashed again. Turns out I was looking in the wrong place because the issue wasn't with the artwork or the animations of monsters at all, but with their pathfinding. A very well hidden bug with monster pathfinding was attempting to normalize a zero vector (an impossible mathematical operation) and the result was that monster position data was becoming corrupted with a NaN value (not a number) ...