I’ve just released a major update to Terra with new import and sculpting capabilities:
NEW FEATURES:
OSM Import - Download OpenStreetMap data (buildings, roads, landuse) directly into Rhino in under 1 minute. Automatically georeferenced and organized by layer.
DEM/SRTM Terrain Import - Import real-world elevation data with automatic mesh generation. Supports worldwide coverage.
Sculpting Tools - Brush-based terrain sculpting with raise, lower, smooth, and flatten operations.
Scattering Tools - Distribute objects across terrain surfaces with controllable density and randomization.
OSM and DEM data import:


Solar Analysis:

Scattering Tool:

Sculpting Tool:

Tutorial can be found in the below video:
Feel free to email me for any questions: wileyhk2001@gmail.com
For installation and core features (landforms, graded paths, platforms), see the original post:

