A watertight mesh paired with a deliberately broken twin (holes, missing faces, open ends), the input and intended result for a mesh-repair / hole-filling tool.
Each card starts with one representative test file. Choose a use case, search, or filter to find a specific profile; a card’s variant menu contains its related samples.
9 test families · 20 available files · Page 1 of 1
Degenerate
The clean reference cube as a GLB, so the same baseline is available to glTF tooling and to the site's 3D preview. Identical topology to the OBJ twin in this group.
Degenerate
The duplicated-corner cube as a GLB. Because glTF stores every attribute per vertex, the duplication doubles the position and normal buffers for a shape that needs eight corners: the cheapest optimisation an asset pipeli
Degenerate
The mixed-winding cube as a GLB with a default single-sided material, so the reversed faces are culled and you can see straight through the model. Turning on doubleSided hides the defect without fixing it, which is the t
Degenerate
The finned cube as a GLB. It renders without complaint in any viewer (rasterisation never asks about adjacency), so this is the fixture that separates tools which actually analyse topology from tools which merely draw tr
Degenerate
The same four degenerate triangles inside a structurally valid GLB. The file passes every glTF schema check (nothing in the format forbids a zero-area face), so this is the fixture for geometry validation as opposed to d
Repair
Deliberately broken box mesh (missing top face). Feed to a mesh-repair tool and compare the result against the watertight ground truth.
Repair
Deliberately broken sphere mesh (open hole at the base). Feed to a mesh-repair tool and compare the result against the watertight ground truth.
Repair
Deliberately broken tube mesh (open, uncapped ends). Feed to a mesh-repair tool and compare the result against the watertight ground truth.
Degenerate
The same NaN vertex in Wavefront OBJ, where the literal is the bare token `nan`. Normals are deliberately not written, because the three faces touching that vertex have no computable normal, which is exactly the state an
