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Volume Graphics (2007), pp. 18 H. -C. Hege, R. Machiraju (Editors)

Summary: Volume Graphics (2007), pp. 1­8
H. - C. Hege, R. Machiraju (Editors)
Simultaneous GPU-Assisted Raycasting of Unstructured
Point Sets and Volumetric Grid Data
submission ID: 1033
In the recent years the advent of powerful graphics hardware with programmable pixel shaders enabled interac-
tive raycasting implementations on low-cost commodity desktop computers. Unlike slice-based volume rendering
approaches GPU-assisted raycasting does not suffer from rendering artifacts caused by varying sample distances
along different ray-directions or limited frame-buffer precision. It further allows direct implementations of many
sophisticated acceleration techniques and lighting models.
In this paper we present a GPU-assisted raycasting approach for data that consists of volumetric fields defined
on computational grids as well as unstructured point sets. We avoid resampling the point data onto proxy grids
by directly encoding the point data in a GPU-octree data structure. This allows to efficiently access the (semi-
transparent) point data during ray traversal and correctly blend it with the grid data, yielding interactive, high-
quality rendering results. We discuss approaches to accelerate the rendering performance for larger point sets and
give real world application examples to demonstrate the usefulness of our approach.
Categories and Subject Descriptors (according to ACM CCS): I.3.3 [Computer Graphics]: Picture/Image
Generation­Viewing Algorithms I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism­


Source: Andrzejak, Artur - Konrad-Zuse-Zentrum für Informationstechnik Berlin


Collections: Computer Technologies and Information Sciences