> For the complete documentation index, see [llms.txt](https://jorge-jgnz94.gitbook.io/hptk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jorge-jgnz94.gitbook.io/hptk/master/modules/gesture-detection/gesture.md).

# Gesture

![](https://2698598769-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MYpeL-Cll-FXMj9b3XC%2F-MZgFIfY0_IVWMKkuzjz%2F-MZgGUiSaFhNE9Vngnfu%2Fgesture.PNG?alt=media\&token=4b06f28f-58e5-448d-aaf8-2cb46456adc8)

## Variables

### Basic

**Active If Greater Than:** Lerp threshold from which the gesture will be considered as active.

**Lerp:** Value from 0 to 1 that reflects the intensity with which the gesture is being performed.

**Is Active:** Is the gesture currently being considered as active?

**Speed:** How fast is gesture's lerp value increasing or decreasing?

**Time Active:** How long has the gesture been active uninterruptedly?

**Provides Intention:** Do this gesture implement intention detection?

### Intentional

Some built-in gestures (grasp and pinch) implement intention detection so they can filter false positives.

**Intetion Lerp:** Value from 0 to 1 that reflects the intensity with which the gesture is being performed intentionally.

**Is Intentionally Active:** Is the gesture currently being considered as intentionally active?

**Intention Time:** How long has the gesture been intentionally active uninterruptedly?

## Events

**OnActivation:** Invoked when the gesture becomes active (when .lerp exceeds the threshold .activeIfGreaterThan).

**OnDeactivation:** Invoked when the gesture becomes inactive (when .lerp drops under the threshold .activeIfGreaterThan).

**OnIntendedActivation:** Invoked when the gesture becomes intentionally active (when .intentionLerp exceeds the threshold .activeIfGreaterThan).

**OnIntendedDeactivation:** Invoked when the gesture becomes intentionally inactive (when .intentionLerp drops under the threshold .activeIfGreaterThan).

## Built-in gestures

Built-in finger gestures are described [here](/hptk/master/modules/gesture-detection/finger-gestures-model.md).

Built-in hand gestures are described [here](/hptk/master/modules/gesture-detection.md).