# Face

> Track one face into control lanes: position, head pose, gaze, mouth, smile, blinks, brows and presence.

Source: https://docs.tune.toys/nodes/sense.face/

Face tracks one face and turns it into control lanes.

## What it does

Connect a video source to `video`. The `control` output has 15 lanes from 0 to 1, in order: x, y, z, yaw, pitch, roll, gaze.x, gaze.y, mouth, smile, blink.l, blink.r, brow, jaw, present. Mouth is lane 9. It runs a MediaPipe model in the browser. The model downloads after the person consents, with its size shown first, and is cached afterwards. Nothing is uploaded. When tracking is lost the lanes hold their last values and `present` falls to 0 after 220 ms.

## When to use it

Use it to play with your face: open your mouth to open a filter. See [Sensing](https://docs.tune.toys/concepts/sensing/).

## Ports

<!-- ports:start -->

| Port      | Direction | Signal  | Lanes |
| --------- | --------- | ------- | ----- |
| `video`   | Input     | Video   | 1     |
| `control` | Output    | Control | 15    |

<!-- ports:end -->

## Parameters

<!-- parameters:start -->

| Parameter  | Label   | Range     | Default | Unit | Scale  | Notes                                                                      |
| ---------- | ------- | --------- | ------- | ---- | ------ | -------------------------------------------------------------------------- |
| `mirror`   | Mirror  | 0 to 1    | 1       |      | linear | Flip x and yaw for a mirrored picture. Choices: 0 As captured, 1 Mirrored. |
| `smooth`   | Smooth  | 0 to 1000 | 60      | ms   | linear | One-pole smoothing of every lane.                                          |
| `delegate` | Compute | 0 to 1    | 0       |      | linear | Run the model on the GPU or the CPU. Choices: 0 GPU, 1 CPU.                |

<!-- parameters:end -->

### Mirror (`mirror`)

Flips x so movement matches a mirror when on.

### Smooth (`smooth`)

Smoothing time in milliseconds for the lanes.

### Compute (`delegate`)

Chooses where the model runs: 0 for the default, 1 for the alternative.

## Tips

- The 15-lane output cannot plug straight into a parameter; pick a lane first.
- Use [Select lanes](https://docs.tune.toys/nodes/ctl.select/) with `"audio": {"channels": 1, "firstChannel": N}` to pick one lane; lanes count from 1.
- A one-lane control cable can drive any parameter through its `{ "node": "x", "port": "@param" }` socket.

## See also

[Select lanes](https://docs.tune.toys/nodes/ctl.select/), [Scale](https://docs.tune.toys/nodes/ctl.scale/), [Smooth](https://docs.tune.toys/nodes/ctl.smooth/), [Sensing](https://docs.tune.toys/concepts/sensing/), [Control lanes](https://docs.tune.toys/concepts/control-lanes/).