  Transparency rendering is problematic and can be considered an open problem
in real-time graphics. There are many different algorithms currently available,
but handling complex scenes and achieving accurate, glitch-free results is
still costly.
  This paper describes LucidRaster: a software rasterizer running on a GPU
which allows for efficient exact rendering of complex transparent scenes. It
uses a new two-stage sorting technique and sample accumulation method. On
average it's faster than high-quality OIT approximations and only about 3x
slower than hardware alpha blending. It can be very efficient especially when
rendering scenes with high triangle density or high depth complexity.
