For those interested in exploring CA Ray Tracing Techniques.   From the CA sample gallery I downloaded the "Zero Sum Kitchen" plan. Other than reducing the width and height to 1200 X 618 I ran a Ray Trace as per CAs' settings. The scene took 1 hour and 54 minutes to reach a point were I could not detect any discernable graininess.   Here is the scene after 1 hour & 54 minutes, needed about 30 passes.   I reworked the lighting and altered some of the materi