GLB — Tightly-packed Vertex Attributes
The same sphere with every attribute in its own bufferView and no byteStride — the layout most exporters emit and most parsers assume. The control against which the interleaved twin in this group is diffed.
Specifications
- Format
- glTF 2.0 binary (GLB)
- Layout
- tightly packed (one view per attribute)
- Byte Stride
- absent
- Attributes
- POSITION, NORMAL, TEXCOORD_0
- Buffer Views
- 4
Testing contract
Reference control- Scenario
- Load both twins and compare the decoded attribute arrays and the rendered result.
- Expected result
- Identical geometry from two different memory layouts; any difference is a byteStride bug, not a data difference.
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
“GLB — Tightly-packed Vertex Attributes” is a deterministic Novus Examples fixture for Conversion testing, Mesh processing QA, Performance testing. 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: 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("tightly-packed.glb")
print(mesh.bounds, mesh.faces.shape)Related files
- glbGLB — 64 Nodes Sharing One MeshAn 8x8 field of columns built from a single 12-triangle mesh referenced by 64 nodes with seeded random heights. Core-glTF instancing needs no extension: the file is tiny, and the interesting question is whether your renderer batches the 64 draws or issues them one by one.
- glbGLB — EXT_mesh_gpu_instancing (32 instances)Thirty-two copies of one cube expressed as instance attribute accessors on a single node under EXT_mesh_gpu_instancing — the extension that moves instancing off the scene graph and onto the GPU. A viewer without support shows exactly one cube at the origin, which is the tell.
- glbGLB — Float32 Vertex BaselineAn unquantised sphere: 32-bit floats for both positions and normals, 24 bytes of attribute data per vertex. The uncompressed reference for the quantized and gzip twins in this group.
- glbGLB — KHR_mesh_quantization TwinThe same sphere with positions as normalised 16-bit and normals as normalised 8-bit integers under KHR_mesh_quantization — 66.6% of the float32 twin's bytes. The extension is in extensionsRequired, so a loader without support must refuse the file rather than render garbage.
- glbGLB — Self-contained BIN ChunkThe third storage strategy for the identical sphere: a GLB whose buffer is the BIN chunk, with no URI at all. Compare the three file sizes in this group to see exactly what base64 and JSON whitespace cost.
- gltfglTF — Base64 Data-URI BufferThe same sphere with its buffer inlined as a base64 data URI: one self-contained text file, at roughly a third more bytes than the binary it encodes. The middle point of the three storage strategies in this group.
Generated by generation/models_p7.py. Free for any use, no attribution required — license.