A new object-order ray-casting algorithm

Authors:
Benjamin Mora;Jean Pierre Jessel;René Caubet
Affiliations:
Institut de Recherche en Informatique de Toulouse (IRIT), Université Paul Sabatier, 31062 Toulouse, France;Institut de Recherche en Informatique de Toulouse (IRIT), Université Paul Sabatier, 31062 Toulouse, France;Institut de Recherche en Informatique de Toulouse (IRIT), Université Paul Sabatier, 31062 Toulouse, France
Venue:
Proceedings of the conference on Visualization '02
Year:
2002

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Abstract

Many direct volume rendering algorithms have been proposed during the last decade to render 2563 voxels interactively. However a lot of limitations are inherent to all of them, like low-quality images, a small viewport size or a fixed classification. In contrast, interactive high quality algorithms are still a challenge nowadays. We introduce here an efficient and accurate technique called object-order ray-casting that can achieve up to 10 fps on current workstations. Like usual ray-casting, colors and opacities are evenly sampled along the ray, but now within a new object-order algorithm. Thus, it allows to combine the main advantages of both worlds in term of speed and quality. We also describe an efficient hidden volume removal technique to compensate for the loss of early ray termination.