## Phong Emitter lobe (elPhng)

key: ** **` elPhng `
type: C

- color: radiant exitance (W/(m^2 nm)).
- color: phong exponent to control emitted power.

## Description

A Phong emitter to be
used in an aggregate (smAgg) material.
The phong exponent gives the power distribution as a function of the angle with the surface
normal. An exponent of 1 indicates a diffuse source.

## Directional emission distribution

Radiant intensity is proportional to cos^e theta where e is the phong
exponent.

## BRDF

Not applicable.

## Examples