TrueTerrain is an environment creation add-on for Blender that features a non-destructive layer system for generating and modifying landscapes. Built on Geometry Nodes, the tool allows users to stack geometry and shader data to construct terrains procedurally. It includes a dynamic noise layer system supporting Noise, Musgrave, and Voronoi profiles, alongside sub-noise layers for fine detail. The add-on also provides a real-time erosion system capable of simulating both hydraulic and thermal erosion, which can be baked over a custom frame range. A dedicated plateau tool offers scatter systems, alluvial fan generation, and terracing for stepped elevation changes.