@inproceedings{61277ec5807d4197b60face3c8556b34,

title = "Implicit Occluders",

abstract = "In this paper we propose a novel visibility-culling technique for optimizing the computation and rendering of opaque isosurfaces. Given a continuous scalar field f(x) over a domain D and an isovalue w, our technique exploits the continuity of / to determine conservative visibility bounds implicitly, i.e., without the need for actually computing the isosurface f -1 (w). We generate Implicit Occluders based on the change in sign of f* (x) = f(x) -w, from positive to negative (or vice versa) in the neighborhood of the isosurface. Consider, for example, the sign of f* along a ray r cast from the current viewpoint. The first change in sign of f* within D must contain an intersection of r with the isosurface. Any additional intersection of the isosurface with r is not visible. Implicit Occluders constitute a general concept that can be exploited algorithmically in different ways depending on the framework adopted for visibility computations. In this paper, we propose a simple from-point approach that exploits well-known hardware occlusion queries.",

keywords = "Computational geometry, Graphics hardware algorithms, Isosurfaces, Marching cubes, Occlusion culling, Visibility computations, Volume visualization",

author = "Sin{\'e}sio Pesco and Peter Lindstrom and Valerio Pascucci and Silva, {Cl{\'a}udio T.}",

year = "2004",

language = "English (US)",

isbn = "0780387813",

series = "Proceedings - IEEE Symposium on Volume Visualization and Graphics 2004. VolVis 2004",

pages = "47--54",

editor = "D. Silver and T. Ertl and C. Silva",

booktitle = "Proceedings - IEEE Symposium on Volume Visualization and Graphics 2004. VolVis 2004",

note = "Proceedings - IEEE Symposium on Volume Visualization and Graphics 2004. VolVis 2004 ; Conference date: 11-10-2004 Through 12-10-2004",

}