Datensatz

Zusammenfassung

Visibility computation is often the bottleneck when rendering indirect
illumination. However, recent methods based on instant radiosity have
demonstrated that accurate visibility is not required for indirect
illumination. To exploit this insight, we cluster a large number of virtual
point lights -- which represent the indirect illumination when using instant
radiosity -- into a small number of virtual area lights. This allows us to
compute visibility using recent real-time soft shadow algorithms. Such
approximate and fractional from-area visibility is faster to compute and avoids
banding when compared to exact binary from-point visibility. Our results show,
that the perceptual error of this approximation is negligible and that we
achieve real-time frame-rates for large and dynamic scenes.