Artifacts drawing behind biter remains

[KiwiHawk]

Artifacts should draw on top of the remains.

[Qatavin]

Surprisingly, the reason for this is that these corpses have shadows. Most don't, or if they do, it's simple shadow integrated into the same layer as the rest of the sprite instead of having a separate shadow layer. Shadows render above items, and this apparently includes item-entities. They also render above the normal "corpses" layer. Because of this, Nauvis enemy corpses have a higher render layer than others, so that their top layer is displayed above their shadows instead of below them.

The solution is to either remove the shadows from the corpses or find a way to integrate them into a single layer. The latter would likely be a huge pain. The former might not be too bad for the spawners (and worm corpses actually don't have shadows, they just happen to be on the same render layer as spawners for the sake of overlapping properly), but for biters and spitters, I think it would be quite conspicuous. But I'll have to run some additional tests tomorrow to see how obnoxious both of these options are.

[KiwiHawk]

I believe the main issue is the spawner and worm remains. Not biters / spitter.