Mercury Computer Systems Inc. has released a state-of-the-art software development kit for real-time ray tracing. OpenRTRT is a 3-D image-rendering application that combines physically correct ray tracing results with the interactivity of conventional shaded surface 3-D graphics. It supports the real-time visualization of scenes with millions of polygons, including exact shadows, and accurate reflections and refractions on curved surfaces. The software’s performance on desktop workstations is scalable on clusters, with each CPU computing up to 2 million rays per second. CAD data can be visualized interactively, even up to 20 million triangles, and complex CAD structures such as headlights can be produced at interactive frame rates.