Information
- Publication Type: Journal Paper (without talk)
- Workgroup(s)/Project(s): not specified
- Date: 1992
- ISSN: 01677055
- Journal: Computer Graphics Forum
- Number: 4
- Volume: 11
- Pages: 203 – 211
Abstract
Constructive Solid Geometry (CSG) defines the shape of objects, i.e. the inside and the outside regions of objects, but it does not define the materialproperties of the space in the interior of objects. The definition is ambiguous. There are points of space lying in several primitives, which can consist of different materials. When visualizing transparent objects this ambiguity leads to strange results, which are not consistent with the CSG modelling scheme and must therefore be eliminated. This work describes how an unambiguous model can be built by asymmetric CSG-operators and how correct refraction and shading on material boundaries can be established by separating surface properties from material properties. This separation leads to a consistent view of CSG modelling also concerning materials and surfaces. Ray tracing CSG trees and the shading model are influenced by these asymmetric operators. We introduce an applied classification scheme to handle the requirements of the new operator definition.Additional Files and Images
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Weblinks
No further information available.BibTeX
@article{gervautz-1992-cons,
title = "Consistent Schemes for Adressing Surfaces when Ray Tracing
transparent CSG Objects",
author = "Michael Gervautz",
year = "1992",
abstract = "Constructive Solid Geometry (CSG) defines the shape of
objects, i.e. the inside and the outside regions of objects,
but it does not define the materialproperties of the space
in the interior of objects. The definition is ambiguous.
There are points of space lying in several primitives, which
can consist of different materials. When visualizing
transparent objects this ambiguity leads to strange results,
which are not consistent with the CSG modelling scheme and
must therefore be eliminated. This work describes how an
unambiguous model can be built by asymmetric CSG-operators
and how correct refraction and shading on material
boundaries can be established by separating surface
properties from material properties. This separation leads
to a consistent view of CSG modelling also concerning
materials and surfaces. Ray tracing CSG trees and the
shading model are influenced by these asymmetric operators.
We introduce an applied classification scheme to handle the
requirements of the new operator definition.",
issn = "01677055",
journal = "Computer Graphics Forum",
number = "4",
volume = "11",
pages = "203--211",
URL = "https://www.cg.tuwien.ac.at/research/publications/1992/gervautz-1992-cons/",
}