iray - Physically Correct GPU Rendering Technology

iray is an intuitive to operate, interactive, consistent, high-performance global illumination rendering technology that generates photorealistic imagery by simulating the physical behavior of light.

CUDA support
Unlike current ray-tracing renderers, iray does not depend on complex renderer specific shaders and settings to approximate global illumination. iray achieves its high level of performance by taking full advantage of the CUDA programming model, allowing interactive previewing on both single and multiple NVIDIA GPU platforms.