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» Rational two-parameter families of spheres and rational offs...
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JSC
2010
86views more  JSC 2010»
12 years 11 months ago
Rational two-parameter families of spheres and rational offset surfaces
The present paper investigates two-parameter families of spheres in R3 and their corresponding two-dimensional surfaces in R4 . Considering a rational surface in R4 , the envelo...
Martin Peternell
CAD
2010
Springer
13 years 4 months ago
Volumes with piecewise quadratic medial surface transforms: Computation of boundaries and trimmed offsets
MOS surfaces are rational surfaces in R3,1 which provide rational envelopes of the associated two-parameter family of spheres. Moreover, all the offsets admit rational parameteriz...
Bohumír Bastl, Bert Jüttler, Jir&iacut...
CAGD
2008
99views more  CAGD 2008»
13 years 4 months ago
On quadratic two-parameter families of spheres and their envelopes
In the present paper we investigate rational two-parameter families of spheres and their envelope surfaces in Euclidean R3. The four dimensional cyclographic model of the set of s...
Martin Peternell, Boris Odehnal, Maria Lucia Sampo...
CAGD
1998
99views more  CAGD 1998»
13 years 4 months ago
A Laguerre geometric approach to rational offsets
Laguerre geometry provides a simple approach to the design of rational curves and surfaces with rational offsets. These so-called PH curves and PN surfaces can be constructed from...
Martin Peternell, Helmut Pottmann
ISSAC
2000
Springer
101views Mathematics» more  ISSAC 2000»
13 years 8 months ago
Symbolic parametrization of pipe and canal surfaces
A canal surface S, generated by a parametrized curve m(t), in R3 is the envelope of the set of spheres with radius r(t) centered at m(t). This concept generalizes the classical of...
Günter Landsmann, Josef Schicho, Franz Winkle...