MINERAL SAGA ← Gallery

ON THE BENCH / 3D STUDY 04 · FROM VIDEO

Green fluorite,
from video.

W. M. Wise Mine, Westmoreland, New Hampshire.
Built from six short orbit videos instead of photographs. Turn it over: the 1967 collection labels are on the underside.

Scan info 360°

Full 360°, from video. The specimen sat on a turntable and was filmed in six slow orbits at 4K, 24 frames a second, the phone held upright: three upright (low, level and from above), then flipped for three more of the underside. From each video the sharpest frame in each of about 100 equal slices was kept, so there are no blurred frames and no large gaps between views. Each frame was cut out from the background, every frame was matched against its neighbours and across orbits to recover where the camera was, and the upright and flipped sessions were joined into one model before training. Detail is softer where the two halves meet and softer than the video itself.

Frames
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Source
6 videos · 2160×3840 at 24 fps · 3 minutes in all
Cameras
One camera for every frame; specimen features only; upright and flipped sessions joined, then refined with the poses during training
Pipeline
Sharpest frames → BiRefNet masks → ALIKED + COLMAP, RoMa dense matching → gsplat
Processed on
Local PC · RTX 5070 Ti
Training
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Checked by
Held-out frames: 99.4% and 99.7% outline match on the top and the underside; the join between them proven at 98.5% against 84.4% for the next-best fit
Model
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Appearance
Degree-3, changes with viewing angle
Download
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Cost
$0 · free, open-source tools
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