I captured a video of the exterior, and interior separately using and iPhone 17 Pro Max, in 4K 60FPS mode.
I extracted the frames with ffmpeg.
I used COLMAP to solve and reconstruct the interior and exterior frames together for one version, and another version with focus to the exterior scenery.
I used Lichtfeld Studio to render the splat for the interior/exterior combined, and Brush to render the splat with focus on the exterior/environment. I rendered 10 million splats for each.
For the interior/exterior combined splat, I selected and cut out just the building itself, and excluded the rest of the scene.
For the exterior/environment splat, I cut out and deleted the structure and left just the environment.
I used a tool called "SuperSplat Snap" to align and combine both splats together.
https://github.com/VFX-Soup/supersplat-snap/tree/main
I used "SplatEdit.app" to do final cleanup for environment and floaters.
https://www.splatedit.app/
I used SuperSplat to keyframe the camera movements and publish.
https://superspl.at/