Interactive ray casting of geodesic grids

Jinrong Xie, Hongfeng Yu, Kwan Liu Ma

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Geodesic grids are commonly used to model the surface of a sphere and are widely applied in numerical simulations of geoscience applications. These applications range from biodiversity, to climate change and to ocean circulation. Direct volume rendering of scalar fields defined on a geodesic grid facilitates scientists in visually understanding their large scale data. Previous solutions requiring to first transform the geodesic grid into another grid structure (e.g., hexahedral or tetrahedral grid) for using graphics hardware are not acceptable for large data, because such approaches incur significant computing and storage overhead. In this paper, we present a new method for efficient ray casting of geodesic girds by leveraging the power of Graphics Processing Units (GPUs). A geodesic grid can be directly fetched from storage or streamed from simulations to the rendering stage without the need of any intermediate grid transformation. We have designed and implemented a new analytic scheme to efficiently perform value interpolation for ray integration and gradient calculations for lighting. This scheme offers a more cost-effective rendering solution over the existing direct rendering approach. We demonstrate the effectiveness of our rendering solution using real-world geoscience data.

Original languageEnglish (US)
Pages (from-to)481-490
Number of pages10
JournalComputer Graphics Forum
Issue number3 PART4
StatePublished - Jun 2013

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design


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