THE DECIMATION FLOOR WAS MISDIAGNOSED. I attributed it to ~180k boundary edges. It is
non-manifold edges. Measured on the shipped 500k mesh:
boundary edges 32,370
NON-MANIFOLD 81,112 <- the actual blocker, 2.5x more
Quadric decimation cannot collapse an edge shared by more than two faces. Upstream's
own fix (fill_holes, via CUDA-only cumesh) targets boundaries and caps at
max_hole_perimeter=3e-2, so it was never going to help: trimesh's equivalent moved
boundaries 32,370 -> 30,990 and the floor only 214k -> 210k. That falsified it.
--manifold: voxelise -> fill -> marching cubes. Removes BOTH classes at once and so
closes three of the four items in one change:
as shipped 499,984 faces bnd 32,370 nonmani 81,112 watertight=F IoU 0.969
remeshed 1,178,142 faces bnd 0 nonmani 0 watertight=T IoU 0.949
-> 20k 19,998 faces bnd 0 winding consistent IoU 0.956
25x smaller, fully manifold, consistent winding, for 1.3% silhouette IoU. Lossy by
design - it gives up the dual grid's open-surface representation - so it is opt-in.
UV BAKE is unblocked by the same change: its cost is driven by face count, not by
remesh. 5.0s at 20k faces against >20min at 214k. No longer offline-only when paired
with manifold.
THE SCALING TRAP, worth knowing: marching_cubes returns vertices in VOXEL INDEX space.
Translating without apply_scale(pitch) leaves the mesh ~292x too large. It still
exports and renders as a plausible object; it silhouettes at IoU 0.08. That is how it
was caught.
MoGe-2 CAMERA is now wired and is the default, matching upstream; --fixed-fov keeps
the old constant. It runs once per image in torch/MPS, ~0.4s after load.
Reporting this one straight: it did NOT improve the samples. On 1_img, fixed 49.1 deg
scored 0.893 and MoGe's 29.7 deg scored 0.883. Two caveats keep it as the default
anyway - the silhouette metric projects with the SAME FOV used to generate, so a
wrong-but-consistent camera can still score well and the metric cannot fully arbitrate
camera correctness; and the bundled samples are synthetic renders, not the photographs
MoGe reads. Real photos are the intended input here, and upstream estimates too. But
the constant is one flag away and the measurement is on record rather than assumed.
Operator gains manifold, divisions, fixed_fov. README and PROFILE.md corrected where
they repeated the boundary-edge claim.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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