# `MaterialSpec.alpha`

> 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 [`MaterialSpec`](MaterialSpec.md) · inherited by [`MaterialInput`](MaterialInput.md) · stable · since 2.0.0

```ts
alpha?: number;
```

0..1.

**Default:** 1

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `alpha` names no product |
| 2. A precedent | pass: [Unity Object.Instantiate](https://docs.unity3d.com/ScriptReference/Object.Instantiate.html) (row `K8`); [glTF 2.0 alpha coverage (BLEND)](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#alpha-coverage) (row `K8`) |
| 3. Two apps, or labs | pass: 2 apps (ledger: app-fc07850558, app-fc306ec3dc; fleet cross-check: app-fc07850558) |
| 4. The cheaper fix first | decided per need in Appendix B: rows `K8` at tier labs, stable (a member only where no rule, data, asset or app code serves the need) |