Research

An Adaptive Acceleration Structure for Screen-space Ray Tracing

"An Adaptive Acceleration Structure for Screen-space Ray Tracing"
Jan Kautz (NVIDIA), Sven Widmer (TU Darmstadt), Dawid Pajak, Andre Schulz (TU Darmstadt), Kari Pulli (Light), Michael Goesele (TU Darmstadt), David Luebke (NVIDIA), in High-Performance Graphics, August 2015
Research Area: 3D Graphics
Ray Tracing
Author(s): Jan Kautz (NVIDIA), Sven Widmer (TU Darmstadt), Dawid Pajak, Andre Schulz (TU Darmstadt), Kari Pulli (Light), Michael Goesele (TU Darmstadt), David Luebke (NVIDIA)
Date: August 2015
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Abstract: We propose an efficient acceleration structure for real-time screen-space ray tracing. The hybrid data structure represents the scene geometry by combining a bounding volume hierarchy with local planar approximations. This enables fast empty space skipping while tracing and yields exact intersection points for the planar approximation. In combination with an occlusion-aware ray traversal our algorithm is capable to quickly trace even multiple depth layers. Compared to prior work, our technique improves the accuracy of the results, is more general, and allows for advanced image transformations, as all pixels can cast rays to arbitrary directions. We demonstrate real-time performance for several applications, including depth-of-field rendering, stereo warping, and screen-space ray traced reflections.