With just a few smartphone photos, VenReal 3D can instantly turn real-world spaces into high-fidelity 3D environments. Powered by 3D Gaussian Splatting (3DGS), a breakthrough in 3D scene reconstruction, VenReal 3D generates photorealistic models from smartphone or drone imagery with up to 95% fidelity in under an hour. This drastically reduces the time and cost of 3D modeling. When integrated with a Geographic Information System (GIS), it visualizes real-time urban environments, boosting design accuracy and communication efficiency. A powerful multi-model fusion algorithm enables seamless stitching and repair of large-scale scenes, providing a digital foundation for smart city development. VenReal 3D also supports disaster simulations of floods and earthquakes, offering critical insights for prevention, planning, and emergency response.