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Stochastic tile-based lighting in HypeHype

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Jarkko Lempiäinen

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Description

Stochastic Tile-Based Lighting in HypeHype is the SIGGRAPH 2025 Advances course PDF notes by Jarkko Lempiäinen of HypeHype on a fixed-cost many-light direct lighting path for a UGC platform spanning budget phones to PCs.

It motivates bandwidth, passive cooling, and tile-GPU constraints, contrasts tiled deferred linear cost and ReSTIR bandwidth with UGC light clumping, then details two-stage Stratified Reservoir Sampling: big 128x128 tiles pick sixteen lights with a cheap PDF, small tiles resample with a richer visibility and BRDF PDF, followed by decoupled deferred shadows and a lighting pass that shares samples per tile for coherence and fp16-friendly pixel-shader implementation.

It is for advanced mobile and multiplatform lighting engineers targeting many dynamic lights without per-pixel ReSTIR-class bandwidth. Familiarity with tiled lighting and reservoir sampling helps.

Access is a free multi-page PDF of speaker notes hosted with the Advances 2025 materials.

It is useful when designing stochastic tiled lighting that stays predictable on entry-level mobile GPUs.