Level of Detail
Wall Worm has various tools to create and manage the Level of Detail of your models. Below are more articles.
The Level of Detail Generator on the Level of Detail Tools Rollout lets you generate LOD models from the root mesh. The tool will make lower-res versions of your model so that less polygons are rendered in-game when players move farther away.
WWMT Level of Detail Model List
This rollout displays all of the LOD (Level of Detail) models in your model. Inside this rollout you can select the helpers that control LOD switch distances, vertex count percentages and add/append models to your LOD models.
Level of Detail (LOD) Generator & Tools Rollout
The Level of Detail Tools Rollout gives you controls for making LOD models and other LOD-related tools.