Nvidia says to have demonstrated the first GPU only ray trace at Siggraph 2008.
The tech demo shows a sports car, which, according to Nvidia, contains up to two million polygons. The rendering performance is said to scale linear. The resolution is said to be 1,920 x 1,080. The demo shows ray tracing shadows, reflections and refractions as well as an anti-aliased image. The application is running on a Quadro Plex 2100 D4 with four GPUs.
Nvidia demonstrates ray tracing
on the GPU [Source: view picture gallery]