LEGO brick (body + studs)

obj_lego_brick · Procedural (exact GT, offline) · generated locally with exact ground truth

Ground-truth mesh

Drag to orbit, scroll to zoom. Rendered from gt/mesh.obj (1036 faces).

Ground-truth views

lighting: studio warm_key tri_env

channel: colour depth normals

Why this sample is in the benchmark

Flat faces plus small repeated high-frequency bumps. This is the classic artifact generator: splats over-smooth the edges and merge the studs into a blob, which the F-score at 5 mm catches immediately but PSNR does not.

Ground truth

GT type

exact

licence

Generated locally -- no third-party licence

source

Procedural (exact GT, offline)

builder

lego_brick {'nx': 4, 'ny': 2}

faces

1036

vertices

536

watertight

True

surface area

4.3282 m²

extents (m)

[1.6, 0.33, 0.8]

GT points

20000 surface samples

views

12 × 128px (orbit, fov 45°)

lighting

studio, warm_key, tri_env

Acquisition plan

kind local, automatic True, estimated size 3.24 MiB

1. Build geometry 'lego_brick' with {'nx': 4, 'ny': 2}
2. Render 12 views (orbit @ 128px, fov 45 deg)
3. Shade under lighting: studio, warm_key, tri_env
4. Write GT mesh, surface points, depth, normals, poses

Fully offline. Ground truth is exact (no SfM, no scan noise).

Comparisons