Analytic Ray Splitting for Controlled Precision DVR

Sebastian. Weiss1, Rüdiger Westermann1

1Computer Graphics & Visualization Group, Technische Universität München, Germany

Abstract

For direct volume rendering of post-classified data, we propose an algorithm that analytically splits a ray through a cubical cell at the control points of a piecewise-polynomial transfer function. This splitting generates segments over which the variation of the optical properties is described by piecewise cubic functions. This allows using numerical quadrature rules with controlled precision to obtain an approximation with prescribed error bounds. The proposed splitting scheme can be used to find all piecewise linear or monotonic segments along a ray, and it can thus be used to improve the accuracy of direct volume rendering, scale-invariant volume rendering, and multi-isosurface rendering.

Associated publications

Analytic Ray Splitting for Controlled Precision DVR

S. Weiss, R. Westermann

Eurographics Conference on Visualization (EuroVis) 2021 [PDF] [Preprint] [BIB] [Code] [Extended Version]

This is the accepted version of the following article: "Analytic Ray Splitting for Controlled Precision DVR (Weiss & Westermann, 2021)", which will be published in final form at onlinelibrary.wiley.com. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy.

Video