# AltoGen

- **Event:** [Gemini 3 Singapore Hackathon](https://cerebralvalley.ai/e/gemini-3-singapore-hackathon)
- **When:** Sat, Mar 7 at 9:00 AM – 10:00 PM (GMT+8)
- **Where:** Location TBA
- **Team:** [Andrew Yu](https://cerebralvalley.ai/u/andnyu)
- **GitHub:** https://github.com/andrewnyu/alto
- **Demo video:** https://youtu.be/PNt62QFlz-g
- **Gallery:** https://cerebralvalley.ai/e/gemini-3-singapore-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gemini-3-singapore-hackathon/hackathon/gallery/31

ALTO is an AI-powered preview tool that shows what the view could look like from a specific location and height.

Users enter an address, floor level, viewing direction, and time of day. ALTO uses Google Maps, Places, and Geocoding to lock onto the exact spot, then pulls real context from Street View, satellite maps, and Elevation data. The Street View images are fed directly into Nano-Banana as reference images, so the generated skyline stays tied to the real location. Gemini writes the short description, and Nano-Banana generates the final panoramic preview image.

This solves a common problem: people cannot easily judge a property’s actual view remotely or when it hasn't been built yet. ALTO helps curious users and potential buyers/renters compare options faster and make better decisions with less guesswork.

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Markdown version of https://cerebralvalley.ai/e/gemini-3-singapore-hackathon/hackathon/gallery/31. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt