Fringe Lights: Colored Penumbra in Glimpse

The recent popularity of stylized rendering calls for new approaches to help artists produce the desired look.Although some effects can be added to the rendered frames in compositing, this requires manual work at the end of the pipeline, leaving preceding stages unclear as to the impact on the final image.In this paper, we present our implementation of fringe lights in our production path tracer, Glimpse, for Netflix's Leo.Fringe lights allow lighting artists to easily modify the appearance of the penumbra, leaving both the unoccluded and fully shadowed parts of the scene unaffected.The soft transition between these two regions can be estimated by tracing at most one additional shadow ray towards the light source, allowing separate illumination at a minimal computational overhead.We extended our light sampling and evaluation for fringe lights to account for three different shading regions and modify the light contribution accordingly.Our method offers artists the freedom to stylize the penumbra and match the desired look of the show with direct visual feedback at every stage of the pipeline.