Redviewer
Redviewer is a 3D interactive module for Autodesk® 3ds Max® / VIZ (Autodesk® Maya® release available in Q2-06). Fully integrated to the Autodesk® 3ds Max® / VIZ User Interface, it enables interactive ray tracing previews at all stages of the 3D production workflow. It supports all kinds of shadows: point lights, area lights, shadow maps, colored and opacity map shadows and even true reflections, transparencies and advanced materials displays!