ibl.hpp File Reference

Common Image Based Lighting functions. (IBL) More...

#include "math/vector.hpp"

Variables
constexpr int32	iblDfgSize = 128
	Size of the Diffuse Fresnel Glossiness Look-Up Table in pixels. (DFG LUT)
constexpr int32	shBandCount = 3
	Spherical harmonics band count.
constexpr int32	shCoeffCount = 9
	Spherical harmonics coefficient count. (3 * 3)

Detailed Description

Common Image Based Lighting functions. (IBL)

IBL is a technique used in physically based rendering (PBR) to simulate realistic lighting in 3D scenes by using an image to define the light environment. Instead of relying solely on traditional light sources like point lights, directional lights, or spotlights, IBL captures the complexity of real-world lighting, including ambient light, reflections, and diffuse lighting, by using images (often HDRI, High Dynamic Range Images) that represent the surrounding environment.

Based on this project: https://google.github.io/filament/Filament.html

Variable Documentation

iblDfgSize

constexpr int32 iblDfgSize = 128

constexpr

Size of the Diffuse Fresnel Glossiness Look-Up Table in pixels. (DFG LUT)

This table is used to precompute certain values related to specular reflections and Fresnel effects, optimizing the real-time rendering of materials, especially those with varying roughness and reflectance.