### Parameters

#### Dirt Color

**Occluded**

Occluded shading color.

**Unoccluded**

Unoccluded shading color.

#### Sampling

**Num Samples**

Controls the number of occlusion samples per camera hit point.

**Sample Distribution**

Sample distribution can be uniform or cosine.

**Cosine Spread**

Sample spread of rays for cosine distribution. A value of f 1 gives Lambertian distribution.

**Falloff**

Falloff values greater than zero create a softer look. Values less than zero give a hard edge when combined with max distance.

**Max Distance**

The max distance at which objects may occlude.

**Direction**

Trace rays in the direction of the surface normal (outside), inverse to the normal (inside), or in both directions.

**Bias Normal**

Add a directinoal bias to the normal vector.