Anyone know how the material roughness/metallic is captured? For instance here https://www.metmuseum.org/art/collection/search/253348. I've only seen basic albedo for 3D scans before. Maybe it's just hand-authored.
No idea what they used but I know that in Brussels they use CultArm3D FT20 by https://verus.digital basically a camera on a robot arm.
From what I saw in that file and a few others (in USDZ), the metalness is not captured.
It's in 0/1_b.jpg , and the file is always pure white.
You are only seeing roughness
I opened them in Houdini and it translates to a USDPreview material, with those PBR channels connected: basecolor, roughness (decent map), metallic (no data, juste white) and normal map (decent map too)