Abstract
We apply Knoll et al.'s algorithm [Knoll et al., "Fast ray tracing of arbitrary implicit surfaces with interval and affine arithmetic.", Comput. Graph. Forum, 28(1):26–40, 2009] to interactively raycast constructive solid geometry (CSG) objects of arbitrary primitives represented as implicit functions. Whereas modeling globally with implicit surfaces suffers from a lack of control, implicits are wellsuited for arbitrary primitives and can be combined through various operations. The conventional way to represent union and intersection with interval arithmetic (IA) is simply using min and max but other operations such as the product of two forms can be useful in modeling joints between multiple objects.
Typical primitives are objects of simple shape, e.g. cubes, cylinders, spheres, etc. Our method handles arbitrary primitives, e.g. superquadrics or nonalgebraic implicits. Subdivision and interval arithmetic guarantee robustness whereas GPU ray casting allows for fast and aesthetic rendering. Indeed, ray casting parallelizes efficiently and trivially and thus takes advantage of the continuous increasing computational power of hardware (CPUs and GPUs); moreover it lends itself to multibounce effects, such as shadows and transparency, which help for the visualization of complicated objects. With our system, we are able to render multimaterial CSG trees of implicits robustly, in interactive time and with good visual quality.
BibTeX  Entry
@InCollection{hijazi_et_al:DFU:2010:2698,
author = {Younis Hijazi and Aaron Knoll and Mathias Schott and Andrew Kensler and Charles Hansen},
title = {{CSG Operations of Arbitrary Primitives with Interval Arithmetic and RealTime Ray Casting}},
booktitle = {Scientific Visualization: Advanced Concepts},
pages = {7889},
series = {Dagstuhl FollowUps},
ISBN = {9783939897194},
ISSN = {18688977},
year = {2010},
volume = {1},
editor = {Hans Hagen},
publisher = {Schloss DagstuhlLeibnizZentrum fuer Informatik},
address = {Dagstuhl, Germany},
URL = {http://drops.dagstuhl.de/opus/volltexte/2010/2698},
URN = {urn:nbn:de:0030drops26986},
doi = {10.4230/DFU.SciViz.2010.78},
annote = {Keywords: Implicit Surface, Constructive Solid Geometry, Interval Arithmetic, Ray Casting}
}
Keywords: 

Implicit Surface, Constructive Solid Geometry, Interval Arithmetic, Ray Casting 
Seminar: 

Scientific Visualization: Advanced Concepts 
Issue Date: 

2010 
Date of publication: 

02.08.2010 