GPU Pro 5

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Physically Based Area Lights

Michal Drobot

1.1 Overview

This chapter presents the physically based area lighting system used in Killzone:

Shadow Fall, developed by Guerrilla Games for Playstation 4 (see Figure 1.1).

We present a novel, real-time, analytical model for area lights, capable of

supporting multiple light shapes. Each shape can be represented by simple 3D

or 2D functions on a plane. Discussed applications include the following light

shapes: sphere, disk, and rectangle.

The model supports diffuse and specular lighting. BRDF (bidirectional re-

flectance distribution function) implementation in Killzone: Shadow Fall ren-

dering engine explicitly ...