I’m looking for a high quality volume rendering GPU/CUDA engine. GPU is designed for 3D applications so it surely must outperform CPUs based 3d engine. I’ve been failed to implement a competitive volumetric ray tracing/casting via CUDA so I’m looking for such development other people did. I did find CUDA implementations but it was not better then my result and totally inferior to CPUs VR_ray-tracer I’ve played with. To be more specific, I’m looking for GPU/CUDA based volumetric ray-tracing/casting to outperform Fovia’s HDVR or at least to match it. The hardware platform can be ultra-high-end NVIDIA video card such as Quadro FX 5800 vs. dual Xeon W5580 WS. Data sets to render is x4 full body 12-bit CT data 512x512x2300 rendered concurrently/consecutively. The rendering scene is semitransparent film like skin tissue and opaque bones. High quality zoom-in/close-look-up without sub-volume re-sampling & on-the-fly modifiable transfer function are paramount requirements. Single projection plane 1584x1088 pixels or/and the same view field divided by 2x2 windows each for one of 4 datasets. Interactive quality is the primary competitive parameter, the final/static quality is the secondary one. The specific/relevant feedback is highly appreciated.