forked from BilalY/Rasagar
32 lines
2.8 KiB
Markdown
32 lines
2.8 KiB
Markdown
# Perlin Curl Noise
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Menu Path : **Operator > Noise > Perlin Curl Noise**
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The **Perlin Curl Noise** Operator allows you to sample a noise value within a specified range in two or three dimensions based on provided coordinates. Perlin curl noise uses similar math to the [Perlin Noise](Operator-Perlin-Noise.md) Operator, but with the addition of a curl function which allows it to generate a turbulent noise. This resulting noise is incompressible (divergence-free), which means that particles cannot converge to sink points where they get stuck.
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A good use case for Curl Noise is emulating fluid or gas simulation, without having to perform complex calculations.
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## Operator settings
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| **Property** | **Type** | **Description** |
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| -------------- | -------- | ------------------------------------------------------------ |
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| **Dimensions** | Enum | Specify whether the noise is two, or three dimensional. |
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| **Type** | Enum | Specify what type of noise to use. |
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## Operator properties
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| **Input** | **Type** | **Description** |
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| -------------- | ------------------- | ------------------------------------------------------------ |
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| **Coordinate** | FloatVector2Vector3 | The coordinate in the noise field to sample from.<br/><br/>The **Type** changes to match the number of **Dimensions**. |
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| **Frequency** | Float | The period in which Unity samples the noise. A higher frequency results in more frequent noise change.<br/> |
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| **Octaves** | Int | The number of layers of noise. More octaves create a more varied look but are also more resource-intensive to calculate.<br/> |
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| **Roughness** | Float | The scaling factor Unity applies to each octave. Unity only uses roughness when **Octaves** is set to a value higher than 1.<br/> |
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| **Lacunarity** | Float | The rate of change of the frequency for each successive octave. A lacunarity value of 1 results in each octave having the same frequency.<br/> |
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| **Amplitude** | Float | The magnitude of the noise. A higher value increases the range of values the **Noise** port can return.<br/> |
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| **Output** | **Type** | **Description** |
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| ---------- | -------- | ---------------------------------------------- |
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| **Noise** | Float | The noise value at the coordinate you specify. |
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