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Adaptive undersampling for efficient mobile ray tracing
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DOI：10.1007/s00371-016-1251-y.png)
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Abstract
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Aiming to develop an efficient ray tracer for a mobile platform, we present an adaptive undersampling method that enhances the rendering speed by effectively replacing expensive ray-tracing operations with cheap interpolation whenever possible. Our method explores both object- and image-space information gathered during ray tracing to detect possibly problematic pixels. Rays are fired only for these pixels. We also present a postcorrection algorithm that minimizes annoying artifacts inevitably caused by undersampling. Our implementation on a mobile GPU demonstrates that this method can speed up the rendering computation significantly, while retaining almost the same visual quality of the rendering.
Keywords:
Ray tracing
Mobile platform
Adaptive undersampling
Postcorrection
GPU algorithm
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