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Re:Darpa Seeks Tools to Capture Underground Worlds in 3D by blh on Thursday May 09, 2019 @03:22PM (#19871351)
For larger environments you tend to need a full-blown SLAM system that can close loops to avoid drift that accumulates inevitably.
Re:Darpa Seeks Tools to Capture Underground Worlds in 3D by zeristor on Thursday May 09, 2019 @03:45PM (#19871593)
Re:Darpa Seeks Tools to Capture Underground Worlds in 3D by jefft255 on Thursday May 09, 2019 @04:00PM (#19871775)
Yes, this is what he means. It uses visual/laser information (sometimes combined with the IMU like the phones you talk about) to map and track movement.
Re:Darpa Seeks Tools to Capture Underground Worlds in 3D by Frost1x on Thursday May 09, 2019 @05:50PM (#19872781)
They also want to create dynamic meshes on the fly for use in OTS game engines which is quite a challenge.

I'm not sure why everyone in that domain is obsessed with meshes and won't work with a voxel rendering system which seems more flexible for most types of current geometry capture techniques. I get that they want to reuse existing simulators using existing gaming technologies but sometimes its fitting a square car through a round garden hose.