waashk/20ng huggingface dataset:
bolson@carson.u.washington.edu (Edward Bolson) writes:  >Boy, this will be embarassing if it is trivial or an FAQ:  >Given 4 points (non coplanar), how does one find the sphere, that is, >center and radius, exactly fitting those points?  I know how to do it >for a circle (from 3 points), but do not immediately see a  >straightforward way to do it in 3-D.  I have checked some >geometry books, Graphics Gems, and Farin, but am still at a loss? >Please have mercy on me and provide the solution?    It's not a bad question: I don't have any refs that list this algorithm either. But thinking about it a bit, it shouldn't be too hard.  1) Take three of the points and find the plane they define as well as the circle that they lie on (you say you have this algorithm already)  2) Find the center  of this circle. The line passing through this center perpendicular to the plane of the three points passes through the center of the sphere.  3) Repeat with the unused point and two of the original points. This gives you two different lines that both pass through the sphere's origin. Their interection is the center of the sphere.  4) the radius is easy to compute, it's just the distance from the center to any of the original points.  I'll leave the math to you, but this is a workable algorithm. :-)   An alternate method would be to take pairs of points: the plane formed by the perpendicular bisector of each line segment pair also contains the center of the sphere. Three pairs will form three planes, intersecting at a point. This might be easier to implement.
Oops, what the hell a crosspost is this ?!  Have a look onto XV-3.00 before saying anything more about it's power.
I'm planning to buy a new VLB/EISA system with a good graphic performance. So far I looked at the ATI GUP VLB as my favorite graphics-card. But  recently I heard something about a new card from  Miro. It was the Miro Crystal 24s with 3 MB and True Color support up to 1024x768. It costs just a little more than the ATI. So, can't decide which one matches better my needs. Any technical references and performance comparisons (especially from the Miro card) would be greatly appreciated.  -Peter-  E-Mail : kohut1@urz.unibas.ch
ESTOP07@CONRAD.APPSTATE.EDU (*ACS) writes:  >Sorry if this is the wrong place to post this  >	I was crusing the net earlier this year and came upon something called  >Color pict of spinning earth.  I am assuming it is a animation sequence of the  >earth's rotation (or revolution I always get those mixed up).  At the time I  >found it my sysem would not even support color graphics so I didn't bother to  >get the pict.  Now I have a fairly nice system and cant find the pict again! >If anyone can help please post here or E-mail me  >Thanks in advance >Eric (Estop07@conrad.appstate.edu)  Likewise for me please. First time I've hear of it, but I've beem looking for something like this for the past few months.
In article <NERONE.93Apr20085951@sylvester.cc.utexas.edu> nerone@ccwf.cc.utexas.edu (Michael Nerone) writes: > In article <1quvdoINN3e7@srvr1.engin.umich.edu>, tdawson@engin.umich.edu (Chris Herringshaw) writes: >  >   CH> Concerning the proposed newsgroup split, I personally am not in  > Also, it is readily observable that the current spectrum of amiga > groups is already plagued with mega-crossposting; thus the group-split > would not, in all likelihood, bring about a more structured > environment.  Am I glad you write that. I got flamed all along because I begged NOT to crosspost some nonsense articles.  The problem with crossposting is on the first poster. I am aware that this posting is a crossposting too, but what else should one do. You never know where the interested people stay in.  To split up newsgroups brings even more crossposting.  --   Jan Holler, Bern, Switzerland         Good is not good enough, make it better! holli!holler@augs1.adsp.sub.org      ((Second chance: holler@iamexwi.unibe.ch))
I'm making a customized paint program in DOS and need an algorithm for reading bitmap files like GIF, PCX, or BMP.  Does anyone have such an algorithm?  I've tried copying one out of a book for reading .PCX format but it doesn't work.  I will take an algorithm for any format that can be created from Windows Paint.   Thanks! Toni
==============================                               GASPRA ANIMATION                                 March 12, 1993                        ==============================       The Gaspra animation is now available at the Ames Space Archives in  QuickTime format.  The animation was formed from 11 images taken by the  Galileo spaecraft shortly before its closest approach to the asteroid in  October 1991.  The animation is available using anonymous ftp to:
Hello there! A few days ago I got a mail concerning bitmap-stretching from SCOTT LEATHAM @ Microsoft Redmond WA, USA. I really would like to answer back to him, but I have  lost his email-address. So if Scott or anybody that knows his email-address reads this, please mail me his address so I can answer his mail.  Please mail to : d91tm@efd.lth.se
A word of warning for those of you registering for SIGGRAPH '93. I just received my registration form back in the mail with the envelope marked "Return to sender. Moved - Left No Address. Closed PO Box". The address I used to register for SIGGRAPH '93 is the one printed on the registration form:       ACM SIGGRAPH '93      PO Box 95316,      Chicago, IL 60694-5316  I printed the envelope in my best printing, honest but evidently SIGGRAPH '93 has skipped town or moved?  I ended up faxing my registration to: 312-321-6876. I hope that number is real!
Does anyone know if the fabled /new/ version of PBM+ will be out soon.  As far as I know the /current/ version is 10dec91. Jeff P. are you out there ? ?? ?
In article <1993Apr15.164940.11632@mercury.unt.edu> mcmains@unt.edu (Sean McMains) writes: > >Wow! A 68070! I'd be very interested to get my hands on one of these, >especially considering the fact that Motorola has not yet released the >68060, which is supposedly the next in the 680x0 lineup. 8-D  A 68070 is just a 68010 with a built in MMU.  I don't even think that Moto. manufactures them.                                    - Ian Romanick                                     Dancing Fool of Epsilon
I was skimming through a few gophers and bumped into one at NIH    with a database that included images in .GIF format.  While I have    not yet worked out the kinks of getting the gopher client to call    an X viewer, I figure that the majority of the users here are not    in an X11 environment - instead using DOS and MS-Kermit.        With Kermit supporting Tek4010 emulation for graphics display,    does anyone know of a package that would allow a Tek to display a    .GIF image?  It would be of more use to the local population to    plug something of this sort in as the 'picture' command instead of    XView or XLoadImage ...
JOB OPPORTUNITY 		      ---------------   SERI(Systems Engineering Research Institute), of KIST(Korea Institute of Science and Technology) is looking for the resumes for the following position and need them by the end of June (6/30).  If you are interested, send resumes to:  	CAD/CAE lab (6th floor) 	Systems Engineering Research Institute 	Korea Institute of Science and Technology  	Yousung-Gu, Eoeun-Dong, 	Daejon. Korea 	305-600   	COMPANY: Systems Engineering Research Institute  	TITLE  : Senior Research Scientist  	JOB DESCRIPTION : In depth knowledge of C. 	Working knowledge of Computer Aided Design. 	Working knowledge of Computer Graphics. 	Working knowledge of Virtual Reality. 	Skills not required but desirable : knowledge of 	data modeling, virtual reality experience, 	understanding of client/server architecture.  	REQUIREMENT : Ph.D  	JOB LOCATION : Daejon, Korea  	Contact Info : Chul-Ho, Lim 		       CAD/CAE lab (6th floor) 		       Systems Engineering Research Institute 		       Korea Institute of Science and Technology  	       	       Yousung-Gu, Eoeun-Dong, 		       Daejon. Korea 		       305-600
Krzysztof Muchorowski was asking about GIF-to-TGA conversion so that he could use DTA 1.5 to convert the TGA files to FLI animation files.
Note the Followup-To: header ...  steelem@rintintin.Colorado.EDU (STEELE MARK A) writes: >Is there a collection of forms routines that can be used with curses? >If so where is it located?  On my SVR4 Amiga Unix box, I've got -lform, -lmenu, and -lpanel for use with the curses library.  Guess what they provide? :-)  Unix Press, ie. Prentice-Hall, has a programmer's guide for these tools, referred to as the FMLI (Forms Mgmt Language Interface) and ETI (Extended Terminal Interface), now in it's 2nd edition.  It is ISBN 0-13-020637-7.  Paraphrased from the outside back cover:      FMLI is a high-level programming tool for creating menus, forms,     and text frames.  ETI is a set of screen management library     subroutines that promote fast development of application programs     for window, panel, menu, and form manipulation.  The FMLI is a shell package which reads ascii text files and produces screen displays for data entry and presentation.  It consists of a "shell-like" environment of the "fmli" program and it's database files.  It is section 1F in the Unix Press manual.  The ETI are subroutines, part of the 3X manual section, provide support for a multi-window capability on an ordinary ascii terminal with controls built on top of the curses library.  >Thanks >-Mark Steele >steelem@rintintin.colorado.edu
I am scanning in a color image and it looks fine on the screen.  When I  converted it into PCX,BMP,GIF files so as to get it into MS Windows the colors got much lighter.  For example the yellows became white.  Any ideas?
To:All  Hi,  Does anybody have the source code to the externel processes that comes with 3D  Studio, and mabe som kind of DOC for writing the processes your self.   /Lars  +++ Author: Lars_Jorgensen@p7.syntax.bbs.bad.se, Syntax BBS, Denmark
Sorry to clog up the news group with this message.  Wayne Rigby, I have the info you requested, but for some reason I can not mail it to you.  Please contact me! Send email address. j --  ------------------------------------------------------------------------------- "No Real Programmer can function without caffeine" - Zen + Art of Internet       _/_/_/_/_/  _/_/_/_/_/  _/_/  _/_/        John S. Muller         _/      _/          _/  _/  _/         muller@diego.llnl.gov        _/      _/_/_/_/_/  _/  _/  _/          muller@sisal.llnl.gov  _/   _/              _/  _/      _/           jmuller@libserv1.ic.sunysb.edu   _/_/_/      _/_/_/_/_/  _/      _/              "You are not drunk until you have to grab the grass,  to keep the grass from falling off the earth" - Some Stupid Comedian
Please help.  I have an IBM-compatible notebook computer with an LCD VGA screen.  While I was working with it this morning, the screen started to flicker a little, which I thought was odd since I do use a surge-protector for my computer and all peripherals.  It only did this for a second and then stopped.  I left the room for several minutes and, when I returned, the screen was completely dim, not blank, but very very dim.  The contrast slider still worked so that I could adjust it to where I could *faintly* make out what was on the screen but the brightness slider had absolutely *no* effect.  I was plugged-in at the time (i.e., not using the battery) but I still tried switching the battery, changing the power-saver features, etc., etc., all to no avail.  Has anyone else experienced anything like this?  If this just means that I need to replace the screen then I guess I'll have to but I thought that the "death" of my LCD screen would be a little less dramatic when it eventually happened.  I didn't want to take it in to be repaired before I asked on the net about this because I already know what they'll say: "Yep, you gotta have this replaced and it's gonna cost you $???."  I've only had the computer for about 21 months.  Is that a reasonable life cycle for a LCD display?  Oh, I guess I ought to give specifics here: the brand is Compudyne (Is this a reputable company?), it's a 386SX @ 20 MHz. I forget the model number exactly and I was too ticked off to write it down before coming in to work today.  If anyone can help me, PLEASE give me any advice you might have.  I'm not opposed to having it replaced, but I'd rather not if it's not absolutely necessary.  If you wouldn't mind, please e-mail me at mike@mik.uky.edu but if you'd rather post I'll be checking back here in a couple of days.  BTW, if the answer to this question is already in a FAQ somewhere, feel free to flame away but I would ask that you also include the location and name of the FAQ if you don't mind.  Thanks in advance for any help...
I recently got a document describing the JPEG FIF (JFIF) file format. I was looking thru it, but I didn't get the idea how to determine the size of a pic in pixel without decoding the whole image.  How do you get the height and width of a JPEG in a JFIF?  How do you determine wether it is a color or a greyscale picture?  I wrote a small tool (lsgif) for GIF that returns the filesize, picture size and color resolution by analizing the header chunks. The output looks like this:    157605  bla.gif                                  640x 480  248C24  I use this lsgif to create index files of my archive and since JPEG are getting more and more popular I would like to have a similar tool for JFIF, with an output like this:     57605  bla.jpg                                  640x 480     C24  Please respond by email, because I don't read this news group very often. I'll post a summary if it is useful.  Thanx in advance, 								Larry
About a year ago I started work on a problem that appeared to be very simple and turned out to be quite difficult.  I am wondering if anyone on the net has seen this problem and (hopefully) some published  solutions to it.  	The problem is to draw an outline of a surface defined by two roughly parallel cubic splines.  For inputs the problem essentially starts with two sets of points where each set of points is on the  edge of an object which we treat as two dimensional, i.e. only extant between the edges, but which exists in three dimensional space.  To draw  the object we   1) fit a cubic spline through the points.  Each spline is effectively 	computed as a sequence of line segments approximating the         curve.  Each spline has an equal number of segments.  We assume 	that the nth segment along each spline is roughly, but not 	exactly, the same distance along each spline by any reasonable 	measure. 2) Take each segment (n) along each spline and match it to the nth segment 	of the opposing spline.  Use the pair of segments to form two 	triangles which will be filled in to color the surface. 3) Depth sort the triangles 4) Take each triangle in sorted order, project onto a 2D pixmap, draw 	and color the triangle.  Take the edge of the triangle that is 	along the edge of the surface and draw a line along that edge 	colored with a special "edge color"  	It is the edge coloring in step 4 that is at the heart of the problem.  The idea is to effectively outline the edge of the surface. The net result however generally has lots of breaks and gaps in the edge of the surface.  The reasons for this are fairly complicated. They involve both rasterization problems and problems resulting from the projecting the splines.  If anything about this problem sounds familiar we would appreciate knowing about other work in this area.
Could someone please help me find a program or figure out how to extract a li st of R G B values for each pixel in an image.  I can convert between tga and s everal other popular formats but I need the R G B values for use in a program I  am writing.  Thanks for the help
Hello, I purchased my new 486 with a NoName graphics card installed which is obviously  Speedstar 24 compatible. Its name is "VGA 4000 TrueColor". It is accompanied with some drivers and the utilities VMODE, XMODE and at least one more MODE, as well as some drivers for Lotus, Windows, etc. Only one of the drivers is told to provide the TrueColor mode, namely the Windows 3.1 driver. Nowhere else, except in the ad, is any pointer to the TrueColor mode. Some articles in this group about the Speedstar 24 and some other facts made me believe that my card is compatible to that one.  Does anybody out there know how this mode can be adjusted? How can I write a driver which allows me to have 16.7 millions of colors with a resolution of 640 x 480 with 45 Hz interlaced ?
I am working on a project where we are going to be including both still and moving grapics within a database.  Of course JPEG and MPEG come to mind as the formats of choice for the various files.  However, from what I read on the Net, it seems as if there are several different forms of each of these.  What I want to do, is settle on a file format which I can count on as being a standard format 10 years from now.  I know Apple is going to support Quicktime on the new Power PC's and, so this may be the format of choice.  What format does Apple's Quicktime use for their products?  I guess it is some kind of MPEG for their motion picture. Is it any different than standard MPEG files?  Thanx for any info!
We are looking for GL source code, which was developed by Silicon Graphics (SGI). We would like to compile it on Sun and HP 9000/700s. If there is anyone already supporting GL on HP and Sun, please respond. Also please respond if anyone knows where the source code is available.   Thank you
I have a question about recursive, backward raytracing.  When an incident ray (I) strikes an object at point P, first the normal (N) is calculated. Light rays are calculated (L1 to Ln  where n is the number of light sources) - these being the light rays that do not intersect with anything. The reflected ray (R) and the transmitted ray (T) is calculated from the formulae.  Calling the routine recursively on R and T will return the colours  along the rays (R and T) as rCol and tCol. Each object has its own colour oCol and each light source has liCol (1 <= i <= n).  The question is:    How do you combine rCol, tCol, oCol and all the liCol's to get   the correct resulting colour to return along the I ray?  All colours are defined as strucures (records) having r, g, b components between 0 and 1.  If anyone has done this before could you give me a few hints?  -- Adrian Secchia
I downloaded the file xv221exe.zip from the site someone posted here. It contained the files:   CJPEG.EXE   DJPEG.EXE   XV.EXE  When I tried to run it, it just said  "Couldn't run go32.exe" and halts.  What's the matter with this?  Are there some files missing in the .zip? What is go32.exe?  any help appreciated.  bye,  Wolfram  --
CALL FOR PRESENTATIONS 	       NAVY SCIENTIFIC VISUALIZATION AND VIRTUAL REALITY SEMINAR  			Tuesday, June 22, 1993  	    Carderock Division, Naval Surface Warfare Center 	      (formerly the David Taylor Research Center) 			  Bethesda, Maryland  SPONSOR: NESS (Navy Engineering Software System) is sponsoring a  one-day Navy Scientific Visualization and Virtual Reality Seminar.   The purpose of the seminar is to present and exchange information for Navy-related scientific visualization and virtual reality programs,  research, developments, and applications.  PRESENTATIONS: Presentations are solicited on all aspects of  Navy-related scientific visualization and virtual reality.  All  current work, works-in-progress, and proposed work by Navy  organizations will be considered.  Four types of presentations are  available.       1. Regular presentation: 20-30 minutes in length      2. Short presentation: 10 minutes in length      3. Video presentation: a stand-alone videotape (author need not  	attend the seminar)      4. Scientific visualization or virtual reality demonstration (BYOH)  Accepted presentations will not be published in any proceedings,  however, viewgraphs and other materials will be reproduced for  seminar attendees.  ABSTRACTS: Authors should submit a one page abstract and/or videotape to:       Robert Lipman      Naval Surface Warfare Center, Carderock Division      Code 2042      Bethesda, Maryland  20084-5000       VOICE (301) 227-3618;  FAX (301) 227-5753        E-MAIL  lipman@oasys.dt.navy.mil  Authors should include the type of presentation, their affiliations,  addresses, telephone and FAX numbers, and addresses.  Multi-author  papers should designate one point of contact.  DEADLINES: The abstact submission deadline is April 30, 1993.   Notification of acceptance will be sent by May 14, 1993.   Materials for reproduction must be received by June 1, 1993.  For further information, contact Robert Lipman at the above address.  	  PLEASE DISTRIBUTE AS WIDELY AS POSSIBLE, THANKS.     Robert Lipman                     | Internet: lipman@oasys.dt.navy.mil David Taylor Model Basin - CDNSWC |       or: lip@ocean.dt.navy.mil Computational Signatures and      | Voicenet: (301) 227-3618    Structures Group, Code 2042    | Factsnet: (301) 227-5753 Bethesda, Maryland  20084-5000    | Phishnet: stockings@long.legs
University of Toronto               Instructional and Research Computing               is sponsoring a technical presentation                     on Visualization Software                _A_d_v_a_n_c_e_d _V_i_s_u_a_l _S_y_s_t_e_m_s (_A_V_S) _S_o_f_t_w_a_r_e                           2:10 PM - 4:00 PM                       Thursday, May 6, 1993                     Sandford Fleming Building                             Room 1105   "Advanced Visual Systems will present this technical seminar on AVS, the world's leading visualization software package.  AVS is a point and click, module driven, easy-to-use product that produces full color, two or three dimensional rendered scenes for interactive observation.  It is supported on all current Unix RISC platforms from Sun, SGI, IBM, H-P, DG, and DEC.  It also runs under DEC VMS.  "AVS is in its fourth year on the street and is very mature.  All fields of science, engineering, medicine, and even business applications now use AVS.  This seminar will focus on its many features in technical detail during a half hour slide presentation.  Following a question period there will be a live demonstration using a Sun SPARCstation.  In addition, a new AVS program called CAMPUS will be introduced at this meeting.  "Also discussed will be the International AVS Center, which provides an on-line repository of over 1000 graphics modules at the North Carolina Supercomputer Center in Raliegh, NC.  AVS has imbedded tools to write one's own customized modules should these not be available with AVS or from AVS International."                               _S_p_e_a_k_e_r_s       The scheduled speaker for this presentation is Mr. Paul Ecklund of Ecklund Associates, the distributor of AVS in Canada.
I'm working on my senior project here at UF (florida). The project requires fractel trees. I'm interested in either psuedo or real code; just about anything will help.  Perhaps some good books on the subject could help too.  	mail will reach at: quartz@iriquois.eel.ufl.edu
In article <27APR93.23959946.0053@music.mus.polymtl.ca> "Gaetan Lord, Ecole Polytechnique de Montreal" <DG03@music.mus.polymtl.ca> writes:     Hi     I would like to know if there is any software, PD or not, who    could produce X11 output of HPGL file on RS/6000. And same kind of    software who could produce hardcopy on postscript and lasetjet.  Try export.lcs.mit.edu.  I think that there is a viewer there called xviewgl.  Check the README in /contrib.
Simple !!  Look for VESA drivers in VPIC 6.0e package !! Many SVGA card supported. Look for it on your favorite BBS.  -- ------------------------------------------------------------------------------ Not tonight honey, i just received my Nuvotel :-]
Hi netters,  	I am currently doing some investigations on "Developable Surface". Can anyone familiar with this topic give me some information or sources which can allow me to find some infomation of developable surface? 	Thanks for your help!