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The Release Candidate for OptiX 2.5 is now available for testing. This important new version provides enhancements that dramatically increase the possibilities for GPU ray tracing, including: Out-of-Core Memory Paging Scene sizes can now exceed GPU memory on professional GPUs (Quadro or Tesla) to the extent there is host RAM available. Unlimited Textures Any number of textures can now be used in scenes (when the textures are not being used in graphics interop). Ultra-Fast Acceleration Structure Building A new GPU-based BVH Builder - HLBVH2 - builds acceleration structures fast enough for interactive editing and deformation. Increased Performance on Divergent Rays Techniques such as path tracing and ambient occlusion should see a noticeable performance increase on complex scenes. Visual Studio 2010 supportWe encourage all developers using OptiX to try RC1 to see if it's working the way you need it to for your application, and to quickly report any issue they may find to the Forum using the OptiX tag.