As you can see in the image above, the OpenMW team were recently struggling with a rather amusing rain-related bug in their open-source re-implementation of the Morrowind engine:

…an issue with the rain, a visual effect that is actually all smoke and mirrors. You wouldn’t (or rather shouldn’t) notice, but when it rains in-game, it doesn’t rain everywhere. There’s no reason to, really; it would be unneccessarily taxing your system for little (visual) gain. Instead, it only rains where the player, you, is walking. In first person you wouldn’t see the difference anyway. But once you switched you third person, you could see how extremely local the rain actually was. That’s been fixed now. Rain will fall wherever your camera is positioned, not wherever your character is.

They’ve also fixed several other significant bugs in the engine and how it handles Morrowind proper, including one bug that resulted in Dagoth Ur dying before the player even had to fight him, and one involving companions and teleportation. And back on the rain-related front, the team are also looking at ways to have current weather conditions reflected in water, should the player happen to have water in view.

There’s a few other things that they’re up to as well; head on over to their site for details.