An object that defines properties of a directional light source.
| Name | Description | Default | Required | 
| intensity | Light intensity, in the [0, 1] range | 1.0 | no | 
| shadow_type | Type of shadowing to use for this light. Valid values are “none”, “shadow_map”, and “raytraced”. | “none” | no | 
| shadow_softness | If the light casts shadows, this is the softness factor to apply to the shadow. | 0.0 | no | 
| shadow_bias | For shadow mapped shadows, this is the shadow bias. | 1.0 | no | 
{
    "intensity" : 0.34,
    "shadow_type" : "shadow_map",
    "shadow_softness" : 3.0,
    "shadow_bias" : 2.8,
}