An open-source Geographic Information System. You can export heightmaps and OSM (OpenStreetMap) data as OBJ or DXF files to import into C4D.
If you are looking to create realistic landscapes, visualize geographic data, or generate 3D maps from real-world locations in Cinema 4D, is likely the first plugin you’ve come across. It is widely regarded as the industry standard for generating procedural terrains inside Cinema 4D. dem earth c4d plugin free download