Скачать или смотреть Importance Sampling: Image-based Lighting of a Lambertian Diffuse BRDF [Shaders Monthly #10]

In Episode #10 of Shaders Monthly, we talk about importance sampling. Importance sampling is an essential tool in computer graphics. As a first simple example, we discuss in this episode how importance sampling can be used for real-time image-based lighting if the material is Lambertian diffuse.

In the practical part, we implement two shaders in GLSL:
1) PrefilterDiffuse
GSN Composer: https://www.gsn-lib.org/index.html#pr...
C++: https://www.mathematik.uni-marburg.de...
Java: https://www.mathematik.uni-marburg.de...

2) IBLDiffuse
GSN Composer: https://www.gsn-lib.org/index.html#pr...
C++: https://www.mathematik.uni-marburg.de...
Java: https://www.mathematik.uni-marburg.de...

Documentation for the shader plugin node of the GSN Composer:
https://gsn-lib.org/docs/nodes/Shader...

Additional lecture slides:
https://www.uni-marburg.de/en/fb12/re...

00:00 Introduction
02:27 Importance Sampling
07:14 Inverse Transform Sampling
11:06 Image-based Lighting of a Lambertian Diffuse BRDF
17:03 Shader 1: Pre-filtered Environment Map
35:19 Shader 2: Image-based Lighting

Source for all HDR environment maps that are used in this video:
https://polyhaven.com/hdris