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Generates a random value using the Perlin-noise algorithm.
| ret noise(x) |
|---|
| Item | Description |
|---|---|
| x |
[in] A floating-point vector from which to generate Perlin noise. |
The Perlin noise value within a range between -1 and 1.
Perlin noise values change smoothly from one point to another over a space, creating natural looking, randomly generated values. You can use Perlin noise to generate procedural textures for effects like smoke and fire.
| Name | Template Type | Component Type | Size |
|---|---|---|---|
| x | vector | float | any |
| ret | scalar | float | 1 |
This function is supported in the following shader models.
| Shader Model | Supported |
|---|---|
| Shader Model 2 (DirectX HLSL) and higher shader models | no |
| Shader Model 1 (DirectX HLSL) | yes (tx_1_0 only) |