A dense ground-truth mesh plus a low-poly simplification of the same shape, with triangle counts recorded, score a decimation / LOD tool by comparing the two.
High-resolution sphere mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
Low-poly simplification of the same sphere shape (140 triangles vs 1728). Compare against the dense ground truth to measure decimation error.
High-resolution torus mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
Low-poly simplification of the same torus shape (196 triangles vs 1600). Compare against the dense ground truth to measure decimation error.
High-resolution vase mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
Low-poly simplification of the same vase shape (100 triangles vs 480). Compare against the dense ground truth to measure decimation error.
High-resolution cylinder mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
Low-poly simplification of the same cylinder shape (36 triangles vs 192). Compare against the dense ground truth to measure decimation error.
The same unit sphere at 16,128 triangles — level 0 of a four-step ladder that spans 202x from top to bottom. Because every level is generated analytically from the same surface rather than decimated, the ladder is an exact reference: any deviation you measure is your tool's, not the fixture's.
The same unit sphere at 3,968 triangles — level 1 of a four-step ladder that spans 202x from top to bottom. Because every level is generated analytically from the same surface rather than decimated, the ladder is an exact reference: any deviation you measure is your tool's, not the fixture's.
The same unit sphere at 960 triangles — level 2 of a four-step ladder that spans 202x from top to bottom. Because every level is generated analytically from the same surface rather than decimated, the ladder is an exact reference: any deviation you measure is your tool's, not the fixture's.
The same unit sphere at 80 triangles — level 3 of a four-step ladder that spans 202x from top to bottom. Because every level is generated analytically from the same surface rather than decimated, the ladder is an exact reference: any deviation you measure is your tool's, not the fixture's.
The densest level of the ladder as a binary little-endian PLY — 8,320 vertices and 16,128 faces, for the mesh-processing tools (MeshLab, CloudCompare, Open3D) that speak PLY rather than glTF.
The coarsest level as plain-text OBJ — 80 triangles you can read end to end. Small enough to paste into a bug report, which is what makes it useful when a pipeline mangles winding or normals and you need the smallest reproducer.
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