TileMapLayer3D is a Godot Engine 4.5+ editor plugin for creating 3D tile-based levels from 2D tilesheets. It provides tools for manual placement, auto-tiling, sculpting, vertex editing, animated tiles, and mesh baking. The plugin integrates deeply with Godot's editor and runtime systems, using a modular architecture with separate managers for different functionalities (placement, selection, autotile, animation, sculpt, vertex edit). It stores tile data in columnar arrays for efficiency and uses region-based spatial partitioning for performance. The plugin includes demo scenes and is actively maintained with recent updates.