OBJ — Sphere LOD 3 (low poly)
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.
Interactive preview rendered from the equivalent glTF (sphere-lod0.glb); drag to orbit. Download the file above for the OBJ original.
Specifications
- Format
- Wavefront OBJ
- Vertices
- 60
- Triangles
- 80
- Lod Level
- 3
- Normals
- true
- Note
- same geometry as sphere-lod3.glb
Testing contract
Expected to pass- Scenario
- Open in a text editor and count the `f` lines, then compare against the GLB twin's triangle count.
- Expected result
- 80 face lines and 60 vertex lines, matching sphere-lod3.glb exactly.
What is a .obj file?
OBJ (Wavefront OBJ) is a text-based 3D geometry format defining vertices, texture coordinates, normals, and faces, and referencing materials through a companion MTL file. It is simple, widely supported, and can represent polygonal meshes with UV mapping. It is a common interchange format across 3D tools.
How to use this file
Use an example OBJ to test mesh and UV parsing, MTL material resolution, and importers in 3D engines, renderers, and modeling applications.
How to use this file for testing
“OBJ — Sphere LOD 3 (low poly)” is a deterministic Novus Examples fixture for Mesh decimation testing, Mesh processing QA. 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.
Documented properties for this file: Wavefront OBJ. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
3D and CAD fixtures carry one small, documented solid or scene. Convert and inspect against the known geometry, units, and structure; format twins let you diff interchange fidelity, and the 3D viewer previews the actual mesh.
Code examples
import trimesh # pip install trimesh
mesh = trimesh.load("sphere-lod3.obj")
print(mesh.bounds, mesh.faces.shape)Related files
- glbMesh Decimation GT — Cylinder Dense (GLB)High-resolution cylinder mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
- glbMesh Decimation GT — Sphere Dense (GLB)High-resolution sphere mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
- glbMesh Decimation GT — Torus Dense (GLB)High-resolution torus mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
- glbMesh Decimation GT — Vase Dense (GLB)High-resolution vase mesh — the ground truth for scoring a decimation / simplification tool against the low-poly member of this group.
- glbMesh Decimation Input — Cylinder Low-poly (GLB)Low-poly simplification of the same cylinder shape (36 triangles vs 192). Compare against the dense ground truth to measure decimation error.
- glbMesh Decimation Input — Sphere Low-poly (GLB)Low-poly simplification of the same sphere shape (140 triangles vs 1728). Compare against the dense ground truth to measure decimation error.
Generated by generation/models_p7.py. Free for any use, no attribution required — license.