This is very cool!
Can you share the technical background you've used for creating the 3D reconstruction? Like software packages, or algorithms used.
Are we looking at the result of packages like OpenSfM here, or COLMAP?
Onsite I used the Matterport capture app and Matterport Pro 2 and BLK 360. For the web version linked here, I built on top of the Matterport SDK with Three.js https://matterport.github.io/showcase-sdk/sdkbundle_home.htm...
So in the virtual tour, you're seeing 360 imagery from the cameras and a lower resolution version of the 3d capture data, optimized for web. The lower res mesh from the scanner is transparent in first-person view mode so users get cursor effects on top of the 360 image.
For film, PBS sent out a documentary crew, and they wanted me to render some footage of the full tunnel system, so I exported the e57 pointcloud data from Matterport and rendered the clips they needed in Unreal. It should be coming out soon with "In the Americas."
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