Mesh Terrain Editor Pro : Mesh Terrain Editor is a mesh-based terrain editor containing 3 main functions:Create mesh-based terrains directly.Convert a terrain/mesh to a mesh-based terrain.Edit mesh-based terrains.The mesh-based terrain (mesh-terrain) is
How to convert your Unity Terrains to (Low Poly) meshes or create Impostor Terrains with the Terrain Converter tool - Advanced - Canopy - Procedural Worlds