  Real-time global illumination is key to enabling more dynamic and physically
realistic worlds in performance-critical applications such as games or any
other applications with real-time constraints.Hardware-accelerated ray tracing
in modern GPUs allows arbitrary intersection queries against the geometry,
making it possible to evaluate indirect lighting entirely at runtime. However,
only a small number of rays can be traced at each pixel to maintain high
framerates at ever-increasing image resolutions. Existing solutions, such as
probe-based techniques, approximate the irradiance signal at the cost of a few
rays per frame but suffer from a lack of details and slow response times to
changes in lighting. On the other hand, reservoir-based resampling techniques
capture much more details but typically suffer from poorer performance and
increased amounts of noise, making them impractical for the current generation
of hardware and gaming consoles. To find a balance that achieves high lighting
fidelity while maintaining a low runtime cost, we propose a solution that
dynamically estimates global illumination without needing any content
preprocessing, thus enabling easy integration into existing real-time rendering
pipelines.
