# Curves

## Custom

<figure><img src="/files/UnFI88uly20eCmLN7hOj" alt="" width="563"><figcaption></figcaption></figure>

Evaluates a user-defined [AnimationCurve](https://unity.com/blog/games/animation-curves-the-ultimate-design-lever).

The X axis should always be in the 0-1 range (it will be remapped to the total duration of the shake).

## **Recoil / Hit / Explosion / Quake**

Preset curves. No additional options for this type.

## Perlin Noise

<figure><img src="/files/zxHD5spEzLehpG5tTzxw" alt="" width="332"><figcaption></figcaption></figure>

Generates random but organic-feeling motion.

**Octaves**: See [Perlin Noise](/shakefx/core/perlin-noise.md) for more details.

**Frequency Fade Out**: How much the frequency decreases as the shake amplitude fades out. Fading both frequency and amplitude can feel more convincing than fading only the amplitude.

## Sine

<figure><img src="/files/8kyPfBjzXH8ZPKcbYQ1I" alt="" width="324"><figcaption></figcaption></figure>

An oscillating `sin(x)` pattern.

**Type**

* **Frequency**: The oscillation is defined in cycles per second (Hz).
* **Num Oscillations**: The oscillation is defined in total number cycles over the shake's duration.

**Frequency Fade Out**: How much the frequency decreases as the shake amplitude fades out. Fading both frequency and amplitude can feel more convincing than fading only the amplitude.

## Square

Same as Sine, but generates a square wave (illustrated in blue):

<figure><img src="/files/RkUezrvQedCMYs428hcu" alt="" width="375"><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://fx-engine.gitbook.io/shakefx/shakes/curves.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.