New Visualization of Surfaces in Parallel Coordinates - Eliminating Ambiguity and Some "Over-Plotting"
<|reference_start|>New Visualization of Surfaces in Parallel Coordinates - Eliminating Ambiguity and Some "Over-Plotting": $\cal{A}$ point $P \in \Real^n$ is represented in Parallel Coordinates by a polygonal line $\bar{P}$ (see \cite{Insel99a} for a recent survey). Earlier \cite{inselberg85plane}, a surface $\sigma$ was represented as the {\em envelope} of the polygonal lines representing it's points. This is ambiguous in the sense that {\em different} surfaces can provide the {\em same} envelopes. Here the ambiguity is eliminated by considering the surface $\sigma$ as the envelope of it's {\em tangent planes} and in turn, representing each of these planes by $n$-1 points \cite{Insel99a}. This, with some future extension, can yield a new and unambiguous representation, $\bar{\sigma}$, of the surface consisting of $n$-1 planar regions whose properties correspond lead to the {\em recognition} of the surfaces' properties i.e. developable, ruled etc. \cite{hung92smooth}) and {\em classification} criteria.   It is further shown that the image (i.e. representation) of an algebraic surface of degree 2 in $\Real^n$ is a region whose boundary is also an algebraic curve of degree 2. This includes some {\em non-convex} surfaces which with the previous ambiguous representation could not be treated. An efficient construction algorithm for the representation of the quadratic surfaces (given either by {\em explicit} or {\em implicit} equation) is provided. The results obtained are suitable for applications, to be presented in a future paper, and in particular for the approximation of complex surfaces based on their {\em planar} images. An additional benefit is the elimination of the ``over-plotting'' problem i.e. the ``bunching'' of polygonal lines which often obscure part of the parallel-coordinate display.<|reference_end|>
@article{izhakian2004new,
    title={New Visualization of Surfaces in Parallel Coordinates - Eliminating
  Ambiguity and Some "Over-Plotting"},
    author={Zur Izhakian},
    journal={Journal of WSCG, 2004, volume 1-3, no 12, pp 183-191, ISSN
  1213-6972},
    year={2004},
    archivePrefix={arXiv},
    eprint={cs/0403004},
    primaryClass={cs.OH}
}