TitleA Magnification Lens for Interactive Volume Visualization (In Proceedings)
inProceedings of Ninth Pacific Conference on Computer Graphics and Applications- Pacific Graphics 2001
Author(s) Eric C. LaMar, Bernd Hamann, Ken Joy
Editor(s) H. Suzuki, L.P. Kobbelt, A.P. Rockwood
Year 2001
LocationTokyo, Japan
DateOctober 2001
PublisherIEEE Computer Society Press
AddressLos Alamitos, California
Abstract Volume visualization of large data sets suffers from the same problem that many other visualization modalities suffer from: either one can visualize the entire data set and loose small details or visualize a small region and loose the context. In this paper, we present a magnification lens technique for volume visualization. While the notion of a magnification-lens is not new, and other techniques attempt to simulate the physical properties of a magnifying lens, our contribution is in developing a magnification lens that is fast, can be implemented using a fairly small software overhead, and has a natural, intuitive appearance. The issue with magnification lens is the border, or transition, region. The lens center and exterior have a constant zoom factor, and are simple to render. It is the border region that blends between the external and interior magnification, and has a nonconstant magnification. We use the “perspectivecorrect textures” capability, available in most current graphics systems, to produce a lens with a tessellated border region that approximates linear compression with respect to the radius of the magnification lens. We discuss how a “cubic” border can mitigate the discontinuities resulting from the use of a linear function, without significant performance loss. We discuss various issues concerning development of a three-dimensional magnification lens.