Search files, editable visual templates, and live browser targets from one registry-backed directory. Filtered query views stay crawlable for links but are deliberately noindex; the stable taxonomy pages below remain the canonical search surfaces.
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A structurally perfect ASCII PLY in which one vertex reads `nan nan nan` — the value an exporter writes after dividing by a zero-length vector. The header, counts and face list are all correct, so the file parses; every bounding box, centroid and normal computed from it is then poisoned.
The signpost as ASCII PLY with +Y up. PLY has no axis or unit element, so the convention survives only as a header comment that no parser reads — the reason scan data so often arrives rotated.
The signpost as ASCII PLY with +Z up. PLY has no axis or unit element, so the convention survives only as a header comment that no parser reads — the reason scan data so often arrives rotated.
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 64x64 two-colour checker referenced by the external-texture glTF in this group. Small, hard-edged and axis-aligned on purpose: UV seams, wrap mode and filter choices are all visible at a glance.
64×64 albedo PNG companion for the textured mini glTF.
The same 1,200-point coloured sphere as a GLB using the POINTS primitive mode — for testing point-cloud rendering in glTF viewers.
A 1,200-point coloured point cloud arranged on a sphere via a Fibonacci lattice — a vertex-only PLY (no faces), the format scanners and LiDAR tools produce. Paired with a GLB (POINTS) twin, for testing point-cloud loaders.
Dense, noise-free point cloud sampled on the dome surface — the reconstruction target for scoring a photogrammetry / point-cloud-cleanup tool.
Dense, noise-free point cloud sampled on the orb surface — the reconstruction target for scoring a photogrammetry / point-cloud-cleanup tool.
Sparse, noisy scan of the same dome surface (700 points, σ=0.05) — a realistic reconstruction / denoise input to compare against the dense clean cloud.
Sparse, noisy scan of the same orb surface (700 points, σ=0.05) — a realistic reconstruction / denoise input to compare against the dense clean cloud.
A 16-tooth spur-gear profile as a closed DXF polyline with a central hub bore — real parametric CAD geometry (not a primitive). For testing DXF parsers, CAM tools, and CAD conversion.
The same 16-tooth spur-gear profile as STEP AP214 CARTESIAN_POINT entities — the CAD-exchange twin of the DXF, for testing STEP parsing.
A minimal, well-formed STEP AP214 file holding the eight corner points of a 10 mm cube. For testing STEP header and entity parsing and CAD-exchange tooling.
Tiny ASCII STL SAMPLE (corner) for mesh importer smoke tests.
A 10 mm cube as ASCII STL — human-readable facet/normal/vertex records. The most portable 3D-print mesh format; for testing STL parsers and slicers.
Tiny ASCII STL SAMPLE (pyramid) for mesh importer smoke tests.
Tiny ASCII STL SAMPLE (slab) for mesh importer smoke tests.
Tiny ASCII STL SAMPLE (tetra) for mesh importer smoke tests.
Tiny ASCII STL SAMPLE (wedge) for mesh importer smoke tests.
The same 10 mm cube as binary STL — an 80-byte header, a triangle count, and packed little-endian floats. Compact; for testing binary-STL readers.
The signpost in millimetres as ASCII STL. STL has no unit field either, but every slicer assumes millimetres — which is why an STL exported in metres arrives as a 1 mm speck and one exported in inches arrives 25.4x too big.
An ASCII STL of the reference cube with two extra facets that have no area and declare a null (0 0 0) normal — exactly what CAD tessellators emit at a sliver. Slicers either drop them, warn, or divide by zero; this is how you find out which.
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