Coffee, Code & Shaders: Real-Time Rendering Conversations

Jacobo Ríos
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Grab your favorite mug, pull up a chair, and join us in this cozy corner for a nice conversation on everything graphics programming — with freshly brewed coffee for all game developers passionate about pixels and algorithms.

  1. -2 ДН.

    Fast Global Illumination in IdTech8

    Today, we’re going to discuss the presentation given at SIGGRAPH 2025 by Thiago Souza, Rendering Technical Director at id Software. He talked about the Global Illumination system developed for their new engine, idTech 8 (used in games like Doom and Indiana Jones). The system replaces slow, static baking with real-time ray tracing using Cascaded Radiance Volumes, allowing for immediate changes in the artistic workflow without having to wait up to 40 hours for bakes. Watch full presentation: https://www.youtube.com/watch?v=VTrdeqMMMK0 Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    36 мин.

  2. 4 ФЕВР.

    Real-Time Soft Shadows in Dynamic Scenes using Spherical Harmonic Exponantiation

    Today we're talking about a 2006 paper that leverages Spherical Harmonics to simplify object visibility and create real-time soft shadows in dynamic settings. By modeling objects as clusters of spheres, it easily handles deformable characters and maintains fluid GPU performance, utilizing spherical harmonic exponentiation for the visibility reconstruction. Read full paper here: https://www.cs.columbia.edu/~bosun/images/research/sig06/download/shexp.pdf Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    27 мин.

  3. 29 ЯНВ.

    Lightning, Atmosphere and Tonemapping in Ghost of Tsushim

    After all the holiday chaos, we’re finally back; and this time, we'll be talking about the presentation given by Jasmin Patry, Lead Render Engineer at Sucker Punch Productions, during SIGGRAPH 2021 regarding dynamic indirect lighting, atmospheric volumetric lighting, and tonemapping in the game Ghost of Tsushima.Whatch full presentation here: https://www.youtube.com/watch?v=GOee6lcEbWg Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    27 мин.

  4. 18.12.2025

    Evaluating and Sampling Glinty NDFs in Constant Time

    To close out the year, before the December festivities begin, we will discuss this paper—a collaboration between Adobe and NVIDIA—which presents a new method for the real-time rendering of glints found in complex materials such as car paint or brushed surfaces. The proposed technique is based on a modification of the microfacet model (such as GGX and Beckmann) and utilizes Russian roulette-based interpolation to improve visual smoothness between levels of detail.Read full paper: https://perso.telecom-paristech.fr/boubek/papers/Glinty/Glinty.pdf Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    36 мин.

  5. 16.12.2025

    Large-Scale Global Illumination at Activision

    On this occasion, we will discuss this presentation given by Ari Silvennoinen, Fellow Software Engineer at Activision, during the Advances in Real-Time Rendering at SIGGRAPH 2021, which focuses on the large-scale global illumination system used in games like Call of Duty and Warzone, focusing on aspects such as an adaptive and warped irradiance volume approach to represent lighting in large maps, and a solution to the light leaking problem caused by the disparity between the volumetric resolution and the game's geometry. Watch full presentation here: https://www.youtube.com/watch?v=snXTGrjfOvQ Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    27 мин.

  6. 11.12.2025

    A deep dive into Ghost of Yotei's tech

    Today we will analyze this article written by Adrian Bentley, Director of Programming at Sucker Punch Productions, on the PlayStation blog, in which he describes the technological innovations implemented for the game Ghost of Yotei, such as improving the landscape, vegetation, weather (including snow and clouds) and the movement of its character, Atsu; in addition to the GPU compute systems and dynamic terrain deformation, as well as the use of ray tracing for global illumination, and optimizations in loading speed. Read full article: https://blog.playstation.com/2025/10/23/ghost-of-yotei-tech-deep-dive/ Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    36 мин.

  7. 09.12.2025

    Rendering Tiny-Glades with Entirely Too Much Ray Marching

    Today we will talk about this presentation given by Tomasz Stachowiak, half of the indie studio Pounce Light, during the Graphics Programming Conference 2025, where he explores the different techniques they used in the engine for their game Tiny Glade, to manage running it on hardware up to 10 years old, from solving problems like shadow acne, global illumination, and depth-of-field using an excessive amount of ray-marching, GPU-driven rendering, and a little bit of ray-tracing. Watch full presentation here: https://www.youtube.com/watch?v=jusWW2pPnA0 Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    31 мин.

  8. 04.12.2025

    A Generalizable Light Transport 3D Embedding for Global Illumination

    Today we will talk about this paper where the authors propose a method to simulate complex light interactions, focusing on the challenge of calculating global illumination using only spatial information from the scene. The main method is based on the development of a generalizable model using a transformer architecture, adapting the Point Transformer V3 network, and is capable of faithfully approximating effects such as soft shadows and color bleeding. Read full paper here: https://www.arxiv.org/pdf/2510.18189 Original Copyright Free Music written, performed, and produced by TrackTribe https://www.youtube.com/watch?v=HK9z2cR8nlM&list=PLFEJ2E5exsjrjRzhJdOYOmTlcYfK3Hz7_

    31 мин.
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Grab your favorite mug, pull up a chair, and join us in this cozy corner for a nice conversation on everything graphics programming — with freshly brewed coffee for all game developers passionate about pixels and algorithms.

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