# `TextureSpec.uv`

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `configurator-runtime.d.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Property of [`TextureSpec`](TextureSpec.md) · inherited by [`TextureSlot`](TextureSlot.md), [`TextureInput`](TextureInput.md) · stable · since 2.0.0

```ts
uv?: 0 | 1 | 2 | 3;
```

UV channel (glTF's TEXCOORD_n). A channel the mesh's geometry lacks, or one this device can't bind, records 'unsupported-spec' with `path` 'patch.material.maps.<slot>.uv' ('scene.rules[i].set.material.maps.<slot>.uv' for a rule [`apply`](Writer.apply.md) lists) and the slot shows no map there; on the fake, where its [`FakeModel`](testing.FakeModel.md) mesh entry declares `uvChannels`.

**Default:** 0

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `uv` names no product |
| 2. A precedent | pass: [glTF KHR_texture_transform](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_texture_transform) (row `K15`); [glTF 2.0 samplers](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#samplers) (row `K15`); [Babylon.js DynamicTexture](https://github.com/BabylonJS/Babylon.js/blob/master/packages/dev/core/src/Materials/Textures/dynamicTexture.ts) (row `K53`); [glTF 2.0 texCoord sets](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#texture-data) (row `K53`) |
| 3. Two apps, or labs | pass: 17 apps (ledger: app-04c2774145, app-0c773a4ee3, app-4762caacdc, app-4f16d2f6da, app-59c5b5751e, app-b362a81c85, app-b4ae2fce25, app-bcb7ef21da and 9 more; fleet cross-check: app-59c5b5751e, app-e61a0b42ad, app-f3598fad77) |
| 4. The cheaper fix first | decided per need in Appendix B: rows `K15`, `K53` at tier stable (a member only where no rule, data, asset or app code serves the need) |