  Photorealistic rendering effects are common in films, but most real time
graphics today still rely on scan-line based multi-pass rendering to deliver
rich visual experiences. While there have been prior works in distributed path
tracing for static scene and objects under rigid motion, real time path tracing
of deforming characters has to support per-frame dynamic BVH changes. We
present the architecture and implementation of the first real-time production
quality cluster path tracing renderer that supports film quality animation and
deformation. We build our cluster path tracing system using the open source
Blender and its GPU accelerated production quality renderer Cycles. Our
system's rendering performance and quality scales linearly with the number of
RTX cluster nodes used. It is able to generate and deliver path traced images
with global illumination effects to remote light-weight client systems at 15-30
frames per second for a variety of Blender scenes including animated digital
human characters with skin deformation and virtual objects.
