Moment-Based Opacity Optimization

DOO without filtering

DOO with object space filtering

MBOO without filtering

MBOO with filtering

The tornado dataset with two different line counts and different methods of filtering for opacity optimization. OIT uses A-buffers. Note how screen space filtering removes clutter in a fixed radius around important structures.

Abstract

Geometric structures such as points, lines, and surfaces play a vital role in scientific visualization. However, these visualizations frequently suffer from visual clutter that hinders the inspection of important features behind dense but less important features. In the past few years, geometric cluttering and occlusion avoidance has been addressed in scientific visualization with various approaches such as opacity optimization techniques.

In this paper, we present a novel approach for opacity optimization based on recent state-of-the-art moment-based techniques for signal reconstruction. In contrast to truncated Fourier series, moment-based reconstructions of feature importance and optical depth along view rays are highly accurate for sparse regions but also plausible for densely covered regions. At the same time, moment-based methods do not suffer from ringing artifacts. Moreover, this representation enables fast evaluation and compact storage, which is crucial for per-pixel optimization especially for large geometric structures.

We also present a fast screen space filtering approach for optimized opacities that works directly on moment buffers. This filtering approach is suitable for real-time visualization applications, while providing comparable quality to object space smoothing. Its implementation is independent of the type of geometry such that it is general and easy to integrate. We compare our technique to recent state-of-the-art techniques for opacity optimization and apply it to real and synthetic datasets in various applications.

BibTeX

@inproceedings {zeidan2020,
    booktitle = {Eurographics Symposium on Parallel Graphics and Visualization},
    editor = {Frey, Steffen and Huang, Jian and Sadlo, Filip},
    title = {{Moment-Based Opacity Optimization}},
    author = {Zeidan, Mahmoud and Rapp, Tobias and Peters, Christoph and Dachsbacher, Carsten},
    year = {2020},
    publisher = {The Eurographics Association},
    ISSN = {1727-348X},
    ISBN = {978-3-03868-107-6},
    DOI = {10.2312/pgv.20201072}
}