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@COMMENT written by Patrick Riley
@PhDThesis{DISS97-oor,
author = {J. Edward {Swan~II}},
title = {Object-Order Rendering of Discrete Objects},
school = {Department of Computer and Information Science, The Ohio State University},
note = {Defended May 12, 1997.},
month = {May},
year = 1997,
abstract = {
This dissertation gives accurate and efficient methods for the
object-order rendering of discrete objects. Discrete objects are
typically represented with a volume raster and rendered with a volume
rendering algorithm. However, current object-order volume rendering
algorithms suffer from several problems. First, they require that the
volume raster be traversed in a strict visibility order, but existing
visibility ordering methods do not always correctly order perspective
projections of volume rasters. Second, both perspective and
orthographic renderings of volume rasters can contain aliasing
artifacts, but current object-order techniques have no method for
addressing these artifacts. Third, computer-generated animations
suffer from temporal aliasing artifacts, which can be addressed by
adding motion blur. But currently the only motion-blur method for
object-order techniques is super-sampling, which is very expensive.
This dissertation presents three new techniques for the object-order
rendering of discrete objects which address these shortcomings. First,
it gives and proves the correctness of a new method for traversing a
rectilinear volume raster in an order that guarantees correct
visibility under a perspective projection. Second, it introduces an
innovative technique for eliminating the aliasing artifacts that occur
when rendering a discrete object. Third, it gives a new technique for
adding motion blur to renderings of discrete objects which is much more
efficient than super-sampling. It uses the common object-order volume
rendering method of splatting as a testbed for realizing these new
techniques.
This dissertation gives examples of the new techniques applied to
volume rendering confocal data, texture-mapping discrete polygons, and
rendering terrain datasets. In particular, the terrain representation
is innovative compared to traditional object-order methods, which
typically represent the terrain with triangular surface patches.
A discrete representation has many advantages over more traditional
surface-based representations for many objects besides just terrains.
These advantages make it likely that discrete representations will be
increasingly used in the coming years. To date, however, the
algorithms available for rendering discrete objects have been less
mature than those for rendering surface-based objects. The techniques
presented in this dissertation promise to help close this gap, and thus
make the advantages of a discrete representation more widely available.
},
}