Vector-to-Closest-Point Octree for Surface Ray-Casting

Demir, Ismail; Westermann, Rüdiger

Vector-to-Closest-Point Octree for Surface Ray-Casting

Files

065-072.pdf (3.62 MB)

demonstration.avi (20.24 MB)

Date

2015

Authors

Demir, Ismail
Westermann, Rüdiger

Publisher

The Eurographics Association

Abstract

GPU voxel-based surface ray-casting has positioned as an interesting alternative to rasterization-based rendering approaches, because it allows using many processing units simultaneously, can effectively exploit thread level parallelism, and enables fine-granularity occlusion culling on the pixel level. Yet voxel-based techniques face the problem that an extremely high resolution is necessary to avoid block artifacts at high zoom levels. In this work, we propose a novel improvement of voxel-based ray-casting to overcome this limitation. By using a hierarchical Vector-to-Closest-Point (VCP) representation, we can inherit the advantages of a voxel-based approach at a much smoother approximation of the surface. We demonstrate that, although the VCP grid consumes more memory per cell, it requires less memory overall, because it builds upon a significantly shallower tree hierarchy. In a number of examples we demonstrate the use of our approach for high-quality rendering of high resolution surface models.

        @inproceedings{10.2312:vmv.20151259
,
booktitle = {Vision, Modeling & Visualization
},
editor = {David Bommes and Tobias Ritschel and Thomas Schultz
},
title = {{Vector-to-Closest-Point Octree for Surface Ray-Casting
}},
author = {Demir, Ismail and 
Westermann, Rüdiger
},
year = {2015
},
publisher = {The Eurographics Association
},
ISBN = {978-3-905674-95-8
},
DOI = {10.2312/vmv.20151259
}
}