As part of the mod that I'm working on, I've needed to do a fair amount of landscaping in the Tamriel worldspace, outside of the usually playable area. All through development, we've had problems with landscaping - raising the existing land is fine, but if you lower it, it works fine in creation kit, but nothing changes in-game except a lower resolution texture - from what I can surmise, you end up running around on the LOD. I'm not sure why it isn't just disappearing when you get close to it. This was an avoidable problem, though.

However, I'm also having trouble with mountain pieces. In creation kit, you can't see them at all and everything appears fine, but if you load the area in-game, there's a giant low resolution mountain over the road. Similarly, if you go a few cells away in creation kit, the once invisible mountain appears where it does in-game, leading me to believe that this is an LOD problem. I have no idea how to go about removing the mountain, though - I can't just select it and delete it in creation kit when I do manage to get it visible.

Will the LOD for the region need to be re-generated (if so, how do I do that?), or is there a slightly less extreme way to get rid of it?