
Revision 2020: Physically Based Shading Without Locking Yourself In
Implementing a physically based shading model without locking yourself in

Advanced Global Illumination Using Photon Mapping
Photon mapping provides a practical way of efficiently simulating global illumination including interreflections, caustics, color bleeding, participating media and subsurface scattering in scenes with complicated geometry and advanced material models. This class will provide the insight necessary to efficiently implement and use photon mapping to simulate global illumination in complex scenes. The presentation will briefly cover the fundamentals of photon mapping including efficient techniques and datastructures for managing large numbers of rays and photons. In addition, we will describe how to integrate the information from the photon maps in shading algorithms to render global illumination.

Bidirectional Path Tracing and Multiple Importance Sampling (2 Minute Papers)
With a classical unidirectional path tracer, we'll have some scenes where it is difficult to connect to the light source, and therefore many of our computed samples will be wasted. What if we would start not only one light path from the camera, but one also from the light source, and connect the two together? It turns out that we get a much more robust technique that can render a variety of "packed" scenes with lots of occlusions with ease.

Excerpt: Quake Postmortem  Optimizing Level Viewing
Michael Abrash succinctly explains Quake's visibility precomputation algorithm using a sharpie and overhead projector.

Matrix rowcolumn sampling for the manylight problem
Computing global illumination using the manylights approach is expensive, this algorithm presents a method ("exploration") for reducing the amount of lights to be sampled.

Metropolis Light Transport (2 Minute Papers)
Metropolis Light Transport is a powerful technique that can outperform the convergence speed of Bidirectional Path Tracing on most difficult scenes (what makes a scene difficult is a story on its own). It promises optimal importance sampling "along multiple steps" in the stationary distribution of the Markov chain.

Path Tracing and Next Event Estimation (2 Minute Papers)
A description of Path Tracing, a ray tracing solution to the rendering equation, and one of its traditional optimizations, Next Event Estimation.

Photon Mapping (2 Minute Papers)
Describes the Photon Mapping solution to light transport.

Practical Global Illumination with Irradiance Caching
Lighting usually only changes smoothly over a surface, Irradiance Caching is a classic approach to reduce the computational cost by only computing lighting at points where it changes quickly.

Radiosity
Lecture describing how to solve the radiosity equations used to compuse diffuse global illumination.

RayTraced Irradiance Fields (RealTime Light Probe Rendering)
[...] how to combine glossy reflection ray tracing with diffuse raytraced irradiance field probes. This creates a complete dynamic global illumination solution that scales across all DXR GPUs and minimizes light leaking without requiring manual perprobe or lightmap work by artists.

Stochastic Lightcuts
A solution to the global illumination problem by sampling from many lights. Stochastic Lightcuts is an improvement on the earlier Lightcuts algorithm. Presentation at HPG 2019.

Stochastic Progressive Photon Mapping (2 Minute Papers)
Describes improvements to Photon Mapping, called Progressive Photon Mapping, Stochastic Photon Mapping, and their combination.

ThinMatrix SingleChannel SDF Font Rendering
Two OpenGL tutorial videos that give an overview of the basics of setting up singlechannel SDF font rendering. Video one covers basic bitmap text rendering, and video two shows how to convert from bitmap to SDF.
Video one: https://www.youtube.com/watch?v=mnIQEQoHHCU
Video two: https://www.youtube.com/watch?v=d8cfgcJR9Tk

Wolfenstein 3D's map renderer
Matt Godbolt's excellent explanation of the Wolfenstein 3D raycasting renderer