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Show HN: I 3D scanned the tunnels inside the Maya Pyramid Temples at Copan

(mused.com)
322 points lukehollis | 3 comments | 15 Oct 24 12:57 UTC | HN request time: 0.203s | source

With these 3d captures, you can explore the 4km tunnel system that archaeologists created inside the temples at Copan that are closed to the public. The tunnels are often flooded by hurricanes and damaged by other natural forces--and collapsed on me and my Matterport scanner more than once--so this is a permanent record of how they appeared in 2022-23.

Unlike Egyptian pyramids, the Maya built their temples layer by layer outward, so to understand them, researchers tunneled into the structures to understand the earlier phases of construction. I arranged the guided versions of the virtual tours in a rough chronology, moving from the highest to the lowest and oldest areas: the hieroglyphic stairway composing the largest Maya inscription anywhere, the Rosalila temple that was buried fully intact, and finally the tomb of the Founder of the city, Yax Kʼukʼ Moʼ.

I've been working to build on top of the Matterport SDK with Three.js--and then reusing the data in Unreal for a desktop experience or rendering for film (coming soon to PBS).

Blog about process: https://blog.mused.com/what-lies-beneath-digitally-recording...

Major thanks to the Matterport team for providing support with data alignment and merging tunnels while I was living in the village near site.

1. farhaven ◴[15 Oct 24 19:51 UTC] No.41852421[source]▶
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?

replies(2): >>41852664 #>>41852711 #
2. lukehollis ◴[15 Oct 24 20:17 UTC] No.41852664[source]▶
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."

3. ◴[15 Oct 24 20:22 UTC] No.41852711[source]▶