From yogeshs at gsslco.co.in Sun May 16 01:26:40 1999 From: yogeshs at gsslco.co.in (Yogesh Sajanikar) Date: Mon Jan 9 13:40:57 2006 Subject: cylindrical spline conversion to cartesian spline! Message-ID: <373DC368.1523DDCA@gsslco.co.in> Hi, My sincere apologies if I have posted a too novice question. I am working on a problem where I need to transfer a b-spline defined in cylindrical coordinates into a ( / may be an approximate ) cartesian b-spline. I would like to know of any methods / algorithms to solve the problem. Thanks in advance. Regards, Yogesh ------------- The compgeom mailing lists: see http://netlib.bell-labs.com/netlib/compgeom/readme.html or send mail to compgeom-request@research.bell-labs.com with the line: send readme Now archived at http://uiuc.edu/~sariel/CG/compgeom/threads.html. From jklosow at ams.sunysb.edu Mon May 17 11:53:28 1999 From: jklosow at ams.sunysb.edu (James Klosowski) Date: Mon Jan 9 13:40:57 2006 Subject: QuickCD Collision Detection Library Message-ID: <199905171453.KAA22593@grizzly.ams> QuickCD Version 1.00 --------------------- We are pleased to announce the release of QuickCD, an efficient collision detection package for large polygonal environments. QuickCD has been implemented in C and tested upon a variety of UNIX platforms (SGI, Sun, Linux PC). It accepts as input general polygonal models (often called ``polygon soup''), and can easily handle cracks, self-intersections, and other deficiencies of the input data. Our method is based upon building bounding-volume hierarchies to approximate the input models. Our choice of bounding volume is to use a ``discrete orientation polytope'', or what we have come to call a ``k-dop'', which is a convex polytope whose facets are determined by halfspaces whose outward normals come from a small fixed set of k orientations. Due to our choice of bounding volume, the construction of the hierarchies and the collision detection algorithm are straight-forward and very efficient, both in terms of memory requirements and speed. Another nice feature of our library is that we are able to exploit temporal coherence as objects move from one step to the next. QuickCD has been around for a while, although, until now, only with limited distribution. It was first announced at SIGGRAPH'96 (Vis. Proc., p. 151), where it was compared with the state-of-the-art RAPID system, based on OBB-trees (SIGGRAPH'96). A more complete description of the data structures and algorithms used within the QuickCD library is given in its journal publication: ``Efficient Collision Detection using Bounding Volume Hierarchies of k-DOPs'', which can be found in IEEE Transactions on Visualization and Computer Graphics, vol. 4, no. 1, pp. 21--36, Jan--March 1998. See also the PhD thesis of J. Klosowski for further details. In comparisons with other publicly available collision detection libraries, QuickCD has performed very favorably. The QuickCD library has been developed at the Computational Geometry Lab at the State University of New York at Stony Brook. It has been written by: Jim Klosowski (jklosow@ams.sunysb.edu) Martin Held (held@ams.sunysb.edu) Joseph S.B. Mitchell (jsbm@ams.sunysb.edu) For further information and instructions on how to obtain the source code and example data sets, please visit the QuickCD web page: http://www.ams.sunysb.edu/~jklosow/quickcd/QuickCD.html Please direct comments and questions concerning QuickCD (including being added to the mailing list) to quickcd@ams.sunysb.edu Thank you. Jim Klosowski ------------------------------------------------------------------------- James T. Klosowski Tel : 516-632-8366 Department of Applied Mathematics Fax : 516-632-8490 SUNY Stony Brook WWW : www.ams.sunysb.edu/~jklosow Stony Brook, NY 11794-3600 Email : jklosow@ams.sunysb.edu ------------------------------------------------------------------------- ------------- The compgeom mailing lists: see http://netlib.bell-labs.com/netlib/compgeom/readme.html or send mail to compgeom-request@research.bell-labs.com with the line: send readme Now archived at http://uiuc.edu/~sariel/CG/compgeom/threads.html. From Jean-Jacques.Royer at ensg.u-nancy.fr Wed May 19 15:05:57 1999 From: Jean-Jacques.Royer at ensg.u-nancy.fr (ROYER Jean-Jacques) Date: Mon Jan 9 13:40:57 2006 Subject: CODATA Conference 28-30 June, Paris Message-ID: Dear colleagues I would like to inform you of a forthcoming CODATA Euro-American conference on "Management of Data Information and Knowledge" to be held in Paris, next 28-30 June 1999. The instruction for manuscripts are available at the following address: http://crpg.cnrs-nancy.fr/NEWS/CODATA/Workshop99.html The inscription form is also directly accessible from the Web. I will appreciate if you could diffuse by e-mail the information in order to promote the conference. Thank you in advance for diffusing this information in your institute and for your participation. Sorry for eventual multi postage. Yours Sincerely _____________________________________________________________________________ Dr. Jean-Jacques ROYER | Centre de Recherches P?trographiques Ecole Nationale Sup?rieure de G?ologie | et G?ochimiques C.R.P.G./C.N.R.S. I.N.P.L./C.R.P.G./E.N.S.G. | 15 rue ND des Pauvres, B.P. 20 Computer Science Department | F 54501 Vandoeuvre-Les-Nancy rue du Doyen Marcel Roubault, B.P. 40 | France F 54501 Vandoeuvre-Les-Nancy | France | phone: 33 (0)3 83 59 64 28 | phone: 33 (0)3 83 59 42 25 fax: 33 (0)3 83 59 64 60 ou 64 | fax: 33 (0)3 83 51 17 98 E-mail: Jean-Jacques.Royer@ensg.u-nancy.fr| E-mail: royer@crpg.cnrs-nancy.fr ____________________________________________________________________________ _ ------------- The compgeom mailing lists: see http://netlib.bell-labs.com/netlib/compgeom/readme.html or send mail to compgeom-request@research.bell-labs.com with the line: send readme Now archived at http://uiuc.edu/~sariel/CG/compgeom/threads.html. From orourke at grendel.csc.smith.edu Mon May 24 10:28:17 1999 From: orourke at grendel.csc.smith.edu (Joseph O'Rourke) Date: Mon Jan 9 13:40:57 2006 Subject: Election results Message-ID: Dear Members of the Comp Geom Community, I am pleased to announce the results of our Steering Committee election. One hundred and five ballots were received, each recording votes for up to five of the twenty-five candidates. The five candidates who received the most votes are: Pankaj Agarwal Jean-Daniel Boissonnat Mike Goodrich Joe Mitchell Jack Snoeyink These five become the new Computational Geometry Steering Committee, to serve two-year appointments. They will organize themselves into officers (Chair, Secretary, etc.) as they see fit, and report at the upcoming SoCG business meeting. Thanks to all for participating in our election process! Joe O'Rourke (Outgoing) Secretary ------------- The compgeom mailing lists: see http://netlib.bell-labs.com/netlib/compgeom/readme.html or send mail to compgeom-request@research.bell-labs.com with the line: send readme Now archived at http://uiuc.edu/~sariel/CG/compgeom/threads.html. From gino at win.tue.nl Tue May 25 00:32:58 1999 From: gino at win.tue.nl (Gino van den Bergen) Date: Mon Jan 9 13:40:57 2006 Subject: ANNOUNCE: GJK-engine collision detection library Message-ID: <19990524233258.A1436@win.tue.nl> I'm happy to announce the release of GJK-engine. GJK-engine is basically the 'heart' of SOLID, a general-purpose software library for collision detection of 3D objects. GJK-engine is a fast and robust implementation of the Gilbert-Johnson-Keerthi algorithm. SOLID uses the GJK algorithm for testing intersections, determining common points, and computing pairs of closest points of convex objects. The GJK-engine is released as a separate library, without the API and bounding-box structures of SOLID. An archive file containing the sources for building the library and an OpenGL demo application can be downloaded from: http://www.win.tue.nl/~gino/solid/ The library is written in standard C++ and relies on STL. Currently, it compiles under GNU g++ version 2.8.1 and Visual C++ 5.0. The source code and documentation is released under the terms of the GNU Library General Public License. -- Gino van den Bergen http://www.win.tue.nl/cs/tt/gino/ ------------- The compgeom mailing lists: see http://netlib.bell-labs.com/netlib/compgeom/readme.html or send mail to compgeom-request@research.bell-labs.com with the line: send readme Now archived at http://uiuc.edu/~sariel/CG/compgeom/threads.html.