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A Linear Time BVH Construction Algorithm for Sparse Volumes

Stefan Zellmann, Matthias Hellmann, Ulrich Lang
To appear in Proceedings of the 12th IEEE Pacific Visualization Symposium 2019,  Bangkok, Thailand, April 23-26, 2019.

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While fast spatial index construction for triangle meshes has gained a lot of attention from the research community in recent years, fast tree construction algorithms for volume data are still rare and usually do not focus on real-time processing. We propose a linear time bounding volume hierarchy construction algorithm based on a popular method for surface ray tracing of triangle meshes that we adapt for direct volume rendering with sparse volumes. We aim at interactive to real-time construction rates and evaluate our algorithm using a GPU implementation.