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REAC 2025 Evolving Global Illumination in Overwatch 2

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Will Pierce

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Description

A REAC 2025 talk by Will Pierce, senior graphics programmer on Blizzard Team 4, about evolving diffuse global illumination in Overwatch 2. This URL is a YouTube recording of that presentation with Q and A.

It describes moving from Enlighten light maps and probes toward baked DDGI-style radiance and visibility volumes while keeping the old path for legacy maps. Covered work includes nested artist volumes, BC6 probe textures, Embree captures against Enlighten clusters, stencil multi-volume evaluation, half-resolution temporal upsampling, Switch texture and 16-bit optimizations, seasonal rollout through Stadium maps, and remaining artist-bake workflow gaps.

It is for intermediate to advanced engine programmers shipping GI across wide hardware ranges in live-service titles. Probe GI and console budget experience helps.

Access is a free YouTube video on the Rendering Engine Architecture Conference channel with slides and moderated questions.

It is useful as a production case study of measuring and rolling out a major lighting replacement under platform constraints.