TrueTerrain is a non-destructive landscape generation add-on that utilizes Blender's Geometry Nodes. The tool introduces a layer-based workflow, allowing users to stack and modify geometry and shader data much like a 2D canvas. The geometry engine features procedural noise generation, supporting types like Musgrave and Voronoi, alongside SubNoise layers for fine-tuning displacement. It includes a real-time erosion system that simulates both hydraulic and thermal weathering, complete with parameters for rain rate, evaporation, and sediment capacity. The add-on also offers specialized tools for scattering plateaus, generating alluvial fans, and creating stepped terracing.