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Sparse Radiance Cascades: goodbye screenspace

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Alexander Sannikov

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Description

[video] Sparse Radiance Cascades: goodbye screenspace is a short demo video by Alexander Sannikov showing an update to a sparse radiance cascades GI experiment.

The description explains replacing an earlier screenspace raymarcher with a hardware-accelerated ray tracer so lighting can include offscreen lights while also running faster. The demo claims stable GI from scratch each frame without a denoiser at 60 fps on a 4090 laptop GPU, notes visible seams between cascades, and states the implementation is still unoptimized. CPU cost in the recording is attributed to validation layers and a debug build.

It is for advanced real-time GI and radiance-cascades practitioners who already follow sparse RC demos and can interpret unpolished research footage.

Access is a free YouTube clip of about ninety seconds with a detailed written description of the technique change.

It is useful as a concise status update on moving sparse radiance cascades off screenspace probes toward hardware ray-traced probes with full offscreen lighting.