PNG — External glTF Base-colour Texture
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.
Specifications
- Format
- PNG (8-bit RGB)
- Width
- 64
- Height
- 64
- Pattern
- 8 px checker
- Colours
- 2
- Role
- baseColorTexture
- Referenced By
- external-texture.gltf
Testing contract
Reference control- Scenario
- Apply as baseColorTexture with wrapS/wrapT REPEAT and inspect the UV seam on the sphere.
- Expected result
- Squares stay square and the seam column shows no smear; a viewer using CLAMP instead of REPEAT stretches the last texel across the seam.
What is a .png file?
PNG (Portable Network Graphics) is a raster image format using lossless DEFLATE compression. It supports full 8- or 16-bit-per-channel truecolor, palette, and greyscale modes with an optional alpha channel, but no animation. It is the standard choice for screenshots, logos, and graphics with sharp edges or transparency.
How to use this file
Use an example PNG to test image decoders, alpha-compositing, thumbnail generators, and format converters, or to verify that a pipeline preserves transparency and color depth on round-trip.
How to use this file for testing
“PNG — External glTF Base-colour Texture” is a deterministic Novus Examples fixture for Texture map testing, Conversion testing. Tileable texture channels with documented roles and resolution, for validating texture pipelines, atlas packers, and material import/export.
Documented properties for this file: 64×64 · baseColorTexture · PNG (8-bit RGB). 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
<img src="external-texture.png" alt="Example image" width="640" loading="lazy">Related files
- binBIN — glTF External Buffer PayloadThe binary payload the external-buffer glTF in this group points at: tightly-packed positions, normals and indices with 4-byte alignment padding. Not viewable on its own — its bufferViews live in the JSON.
- glbGLB — Interleaved Vertex Attributes (byteStride 32)Position, normal and UV packed into ONE bufferView with byteStride 32 and three accessors at offsets 0, 12 and 24 — the GPU-friendly layout, and the one a naive parser mis-reads because it assumes each accessor owns its view. Twinned here with a tightly-packed version of the same sphere.
- 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.
- glbGLB — Tightly-packed Vertex AttributesThe 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.
- 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.
- gltfglTF — External .bin BufferA glTF whose single buffer is a relative URI to a sibling .bin — the layout every DCC tool writes by default, and the one that breaks the moment an asset is moved or served from a different directory. Download the .bin in this group alongside it.
Generated by generation/models_p7.py. Free for any use, no attribution required — license.