# DirectionalLight

Create a directional light source which emits from a specific direction.A directional light can be considered "infinitely" far away (like the Sun) and does not attenuate with distance. At most 5 directional lights can be supported.


## Usage

Create a directional light source with color, intensity and direction.
```js
const directionalLight= new DirectionalLight({
  color: [128, 128, 0],
  intensity: 2.0,
  direction: [0, -100, -100]
});
```

## Methods

### constructor

The constructor for the `DirectionalLight` class. Use this to create a new `DirectionalLight`.

```js
const directionalLight = new DirectionalLight({color, intensity, direction});
```

* `color` - (*array*,)  RGB color of directional light source, default value is `[255, 255, 255]`.
* `intensity` - (*number*) Strength of directional light source, default value is `1.0`.
* `direction` - (*array*,)  3D vector specifies the direction the light comes from, default value is `[0, 0, -1]`.