glTF Skinned Mesh — Four-joint Chain (GLB)
A longer tube skinned to a four-joint chain, every joint but the root animated, so the whole limb curls rather than hinging once. Exercises joint-matrix accumulation down a hierarchy — the step that a two-bone rig cannot catch.
Specifications
- Format
- glTF 2.0 binary (GLB)
- Joints
- 4
- Vertices
- 400
- Triangles
- 768
- Weights Per Vertex
- 4
- Animations
- 1
- Channels
- 4
- Interpolation
- LINEAR
- Duration Seconds
- 3
Testing contract
Expected to pass- Scenario
- Play the clip and check that each joint's world matrix is its parent's matrix times its own local rotation.
- Expected result
- The tip traces a smooth arc; a renderer that ignores parent accumulation leaves the upper segments straight.
What is a .glb file?
GLB is the binary form of glTF, packaging 3D scene geometry, materials, textures, animations, and node hierarchy into a single self-contained file. It is optimized for efficient runtime loading and is often called the JPEG of 3D. It is widely used in web, AR, and real-time 3D applications.
How to use this file
Use an example GLB to test glTF loaders, embedded-texture and animation handling, and real-time rendering pipelines in web or game engines.
How to use this file for testing
“glTF Skinned Mesh — Four-joint Chain (GLB)” is a deterministic Novus Examples fixture for Conversion testing, Mesh processing QA. The same content exported across many formats and linked as a group, so you can convert one and diff against the expected twin.
Documented properties for this file: 4 ch · glTF 2.0 binary (GLB). 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("skinned-four-bone.glb")
print(mesh.bounds, mesh.faces.shape)Related files
- glbglTF Animation — Four Channels Across Two Nodes (GLB)A single animation whose four channels drive two nodes at once: the parent's translation, rotation and scale, and a spinning child that inherits all of it. The fixture for checking that channels are applied per node and per path rather than collapsed into one track.
- glbglTF Node Animation — CUBICSPLINE Sampler (GLB)One cube on one node, with translation, rotation and scale each driven by a five-key sampler that is cubic-spline, with in/out tangents stored around each value. Three files differing only in `interpolation` — the cleanest way to prove an animation player implements all three modes rather than treating everything as linear.
- glbglTF Node Animation — LINEAR Sampler (GLB)One cube on one node, with translation, rotation and scale each driven by a five-key sampler that is linearly interpolated. Three files differing only in `interpolation` — the cleanest way to prove an animation player implements all three modes rather than treating everything as linear.
- glbglTF Node Animation — STEP Sampler (GLB)One cube on one node, with translation, rotation and scale each driven by a five-key sampler that is held (STEP) — the value jumps at each key. Three files differing only in `interpolation` — the cleanest way to prove an animation player implements all three modes rather than treating everything as linear.
- jsonConvert v2 3DS Semantic Geometry ReferenceJSON semantic reference for the 3DS tetrahedron, publishing vertex order, face indices, bounds, and the closed-mesh contract. Stable P8 artifact p8-convert-model-3ds-reference.
- jsonConvert v2 AMF Semantic Geometry ReferenceJSON semantic reference for the AMF tetrahedron, publishing vertex order, face indices, bounds, and the closed-mesh contract. Stable P8 artifact p8-convert-model-amf-reference.
Generated by generation/models_p7.py. Free for any use, no attribution required — license.