This test shows what kind of rendering is possible with 3DVIA Studio : http://www.3dvia.com/studio/ This is a great tool for authoring of interactive content and prototyping (plus it is free)
Thanks to its shader editor, I could write this small GPU shader.
You need a windows machine and a recent GPU to run that demo (Shader model 3.0 support), especially in fullscreen. (fullscreen can be activated from the system tray once the experience is launched)
You can see it live here : http://www.3dvia.com/experiences/B93EA8AF8193A5B7/gpu-raytracing-with-3dvia-studio
Video #1 : http://www.youtube.com/watch?v=FvfxChy1UTg Video #2 : http://www.youtube.com/watch?v=VhQFQXJbCqk
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