HDTenEightyP/NetNews huggingface dataset:
From: qb7g6@fel.tno.nl (Maarten Landzaat)
Subject: What's "xnews:Warning:input queue lock broken"?
Keywords: PHIGS, Openwindows, Sun
Organization: TNO Physics and Electronics Laboratory
Date: Fri, 24 Jul 1992 08:10:19 GMT

Please let me know if you know anything about the following:

I transformed the PHIGS example "pickjet" to work with an openlook
interface: It now has a.o. a button to start the "pick loop".
In the callback of the button, PHIGS enters a loop in which PICKS
are requested.
When I push this button TWICE (i.e. without picking something in 
between) my entire screen hangs: it cannot receive mouse input anymore.

The same problem seems to occur whenever I inadvertently press ANY button
twice, of which the callback performs PHIGS input.

After having killed the processes (PHIGS runs a separate unix process to
manage the "X tool", the window in which the graphics are done),
this message appears in the console:

"xnews: Warning: input queue lock broken".

Also, a number of times proportional to the number of events I tried to
generate, the following message appears:

"olwm: Warning: failed to grab pointer".

I use a SPARC, SunPHIGS 2.0, Openwindows 3.0, Devguide 3.0 with the xview
toolkit. 
----------
My questions:

1 Has anyone had a similar experience?

2 Does anyone know the meaning of the error messages?

3 How is it possible that an event for a process that isn't waiting for
  events (after all, it's in the callback) can mess up things that badly?
  Or is PHIGS's xtool process to blame?


Any reaction is appreciated!
Thanks in advance.
-- 
Maarten J. Landzaat (analyst/programmer, bass player, Atari/midi freak)
BSO/Aerospace & Systems			Mail: Spuistraat 97
Email: maarten.landzaat@fel.tno.nl	      1012 SV  Amsterdam
Phone: +31 20 6266098			      The Netherlands
From: michael@cwi.nl (M. Guravage)
Newsgroups: comp.graphics
Subject: winterp Xlib drawing functions?
Summary: Looking for winterp Xlib graphics support.
Keywords: winterp Xlib xlisp
Date: 24 Jul 92 06:56:19 GMT

Has anyone extended winterp to support Xlib drawing functions such as
XDrawPoint, XDrawLine XDrawSegments XDrawArc, XFillRectangle, etc?


-- 
Michael A. Guravage                                    Email: michael@cwi.nl
Centre for Mathematics & Computer Science (CWI)        Phone: +31 20 5924164
Department of Interactive Systems                      Telex: 12571 mactr nl
Kruislaan 413, 1098 SJ Amsterdam  The Netherlands      Telefax: +31 20 5924199
From: markc@hpcvxjme.cv.hp.com (Mark Cook)
Newsgroups: comp.graphics,alt.book.reviews
Subject: Re: Graphics book
Date: 30 Jul 92 19:20:30 GMT
Article-I.D.: hpcvusn.1992Jul30.192030.14818
Reply-To: markc@cv.hp.com
Organization: UTD-CV Corvallis, OR

In article <1992Jul30.183238.6202@magnus.acs.ohio-state.edu>, mmasood@magnus.acs.ohio-state.edu (Mohammed A Masood) writes:
> Hi, could any one on the net recommend a good book which deals with different
> kinds of graphics files, .gif, tiff, rtt and so on.  I mean a book explaining
> these files and telling us how to convert from one form to another
> Thanks in advance

I just got the following book (details appended below) from my local
university bookstore (special order) and strongly recommend it as an
answer to your needs.  The format descriptions for some of the more
complex formats are not complete, but easily provide enough information
to allow you to decode a file written in that format.

Regards,

        Mark F. Cook

USMail: Hewlett-Packard
        User Interface Technology Division - Corvallis (Tech. Marketing)
        1000 NE Circle Blvd.  Corvallis, OR 97330

INTERNET: markc@hpcvss.cv.hp.com
          markc%hpcvss.cv.hp.com@relay.hp.com

=================================CUT HERE======================================
> From: johnl@iecc.cambridge.ma.us (John R. Levine)
> Date: Mon, 8 Jun 1992 05:57:17 GMT
> Subject: Graphics File Formats
> Organization: I.E.C.C.
> Newsgroups: misc.books.technical
> 
> David Kay and John Levine (that's me,) "Graphics File Formats,"
> Windcrest/McGraw-Hill, May 1992, ISBN 0-8306-3059-7 $24.95 paper,
> ISBN 0-8306-3060-0 $36.95 hardcover, 278 pp.
> 
> We describe many major graphics file formats.  For most of them (all
> but JPEG and CGM) we go all the way down to the bit level so there's
> enough to write code that handles the file format.  We've attempted
> to include as much folklore as we can, e.g. the facts about PCX that
> aren't in the Z-Soft handout, poorly documented proprietary TIFF
> content types, and which fields in a TGA file people really use.
> 
> Table of Contents
> 
> 1	Graphics Representation Theory
> 2	Formats and Applications
> 
> Bit Maps
> --------
> 3	Z-Soft PCX
> 4	MacPaint
> 5	Aldus Tagged Image File Format
> 6	Compuserve Graphics Interchange Format
> 7	Digital Research Gem IMG
> 8	IFF/ILBM
> 9	Truevision Targa
> 10	Microsoft Windows BMP
> 11	Sun Rasterfile
> 12	Unix PBM
> 13	X Window XBM
> 14	X Window XWD
> 15	JPEG
> 16	FITS
> 
> Vectors
> -------
> 17	Autocad DXF
> 18	Hewlett Packard HP-GL
> 19	Lotus PIC
> 20	Unix Plot(4)
> 
> Printers
> --------
> 21	Hewlett Packard PCL
> 22	Adobe Encapsulated Postscript
> 
> Display Lists or Metafiles
> -----------------------------
> 23	Microsoft Windows Metafile
> 24	Apple Macintosh PICT
> 25	ANSI Computer Graphics Metafile
> 
> 26 Other Formats
> -- 
>  John R. Levine, IECC, POB 349, Cambridge MA 02238, +1 617 492 3869
From: lilleyc@cs.man.ac.uk (Chris Lilley)
Newsgroups: comp.graphics
Subject: Re: graf-bib-server (was Re: Anyone want to post the old FAQ ?)
Date: 26 Jul 92 23:47:49 GMT
Reply-To: lilleyc@cs.man.ac.uk (Chris Lilley)
Organization: Department of Computer Science, University of Manchester UK

In article <Bs0LIE.Ev3@cs.columbia.edu> olasov@cs.columbia.edu (Benjamin
Olasov) writes: 

>The old FAQ referenced a very useful graphics bibliography server that
>lived at graf-bib-server@decwrl.dec.com.  Mail to this address now
>results in an 'unknown user' message from the mailer daemon.

>Does anyone know what became of the graphics bibliography server?

Last time I looked there, the entries stopped in 1986. That was last year
sometime. I guess that interest, money and/or personnel dried up...

>Is there another that's active?

Not that I have heard of, but if anyone knows different?

Chris
Newsgroups: comp.graphics
From: hahn@seas.gwu.edu (James K. Hahn)
Subject: Fellowship at The George Washington University
Organization: George Washington University
Date: Wed, 22 Jul 1992 20:30:06 GMT



Due to the responses to the first posting, I am including more
information.


********************************************************************
We are announcing a fellowship at the George Washington University
in computer graphics. The fellowship should begin either Fall '92
or Spring '93 and is for Ph. D. students.

The Presidential Merit Fellowship at GWU is the most prestigious fellowship
at GW. The fellowship is for three years. The stipend is approximately
$15,000 per year. Full tuition is provided. After the three years, the 
student is expected to be supported through regular project grants.

The Computer Graphics and Animation Group at the George Washington University
has recently established a laboratory in a new building and is actively 
engaged in a number of research areas. These include:

	Computer Animation
	Scientific Visualization
       	Realistic Image Synthesis
       	Virtual Reality
       	Sound Synthesis/Synchronization for Animation and VR
	User Interfaces

If you are interested in the kind of work we are currently conducting, we
have entries in the Film and Video Show, the Video Screening Room, and
a paper in the Proceedings in this year's SIGGRAPH.

We recently purchased three Indigo Elans and a Crimson Elan from SGI.
The lab is also equipped with an IRIS 4D/210GTX, six Sun 4 workstations
and their file server, and full animation video equipment including an 
editing suite.
We also have access to a number of HP and Sun workstations including two
HP 835 Turbo SRX.

The group is currently composed of three faculty members:
James Hahn, John Sibert, and Hikmet Senay
as well as approximately 15 graduate students.

If you are interested in more information, please contact me
by email:

hahn@seas.gwu.edu
(202) 994-5920

Send me your vita, full transcript of your undergraduate and
graduate courses, any papers or thesis you might have written,
and a description of your interest to:

Prof. James Hahn
Department of Electrical Engineering and Computer Science
The George Washington University
801 22nd Street NW
Washington, DC 20052
-- 
James K. Hahn		The George Washington University
Asst. Professor		Department of EE&CS
hahn@seas.gwu.edu	801  22nd Street NW, Washington, DC  20052
Newsgroups: comp.graphics
From: Meessen@slig.ucl.ac.be  (Christophe Meessen)
Subject: Wanted : 4 sides polygon fill as C func
Followup-To: comp.graphics
Organization: Universite Catholique de Louvain (Belgium)
Date: Fri, 24 Jul 1992 16:28:59 GMT


Hi, I'm looking for a 4 sides polygon filling routines written in C
language.

It should work on a bitmap (1 bit == 1 pixel).
Polygon sides are given as a sequence x1,y1,x2,y2,x3,y3,x4,y4. 

The algorithm or function should be general enough to handle any sort of 4
sides  polygon: concave, convex or cross sided.

Thanks.

Bien cordialement,

                           Christophe MEESSEN
Newsgroups: comp.graphics
From: spec01@solomon.technet.sg (Quak Wan Ling)
Subject: Re: PHIGS IMPLEMENTATIONS
Organization: National University of Singapore
Date: Tue, 28 Jul 1992 04:05:15 GMT

   Beside figaro, there's GPHIGS by G5G(a french coy) and DecPHIGS of
   cse. Hope that helps.
From: sngattan@matt.ksu.ksu.edu (Sanjay N Gattani)
Newsgroups: comp.graphics
Subject: Image Processing Package..JAVA?
Date: 29 Jul 1992 09:05:38 -0500
Organization: Kansas State University
Distribution: usa
NNTP-Posting-Host: matt.ksu.ksu.edu
Keywords: Image Processing


Hello:

	Does anyone out there know anything about JAVA image processing
software?  I think it is marketed by Jandel Scientific, a company
in California.  What I would like to know is what type of image files
can it accept?
Thanks and bye

						sanjay
						sngattan@matt.ksu.ksu.edu
	
Newsgroups: comp.graphics
From: stare@edstar.rl.af.mil (Edward M. Starczewski)
Subject: Re: Angle between two coordinate locations
Organization: Rome Laboratory
Date: Tue, 21 Jul 92 17:25:50 GMT

In article <l6faduINN8f0@girtab.usc.edu> joseph@girtab.usc.edu (Randi Joseph) writes:
>Path: lonex.rl.af.mil!blackbird.afit.af.mil!udecc.engr.udayton.edu!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!chaph.usc.edu!news
>From: joseph@girtab.usc.edu (Randi Joseph)
>Newsgroups: comp.graphics
>Subject: Angle between two coordinate locations
>Date: 17 Jul 1992 22:18:54 -0700
>Organization: University of Southern California, Los Angeles, CA
>Lines: 24
>Message-ID: <l6faduINN8f0@girtab.usc.edu>
>NNTP-Posting-Host: girtab.usc.edu

>I have a problem where I need to obtain the angle between two points
>on the screen.  For instance:

>        +------------------------------------------+
>        |   * <-point 1                            |
>        |                                          |
>        |                                          |
>        |                                          |
>        |                                          |
>        |                                          |
>        |                                          |
>        |                   * <-point 2            |
>        |                                          |
>        +------------------------------------------+

>I would expect the function to return the angle as being 135 degrees
>( or should if my picture was accurate )  Any help would be greatly
>appreciated.  Thanks



>                                        Randi Joseph
>                                        joseph@girtab.usc.edu

I'm a little confused, How do you define an angle between two points without
first defining the location of the vertex.  Is the vertex just assumed to be
the origin (0,0)?
Edward M.Starczewski       email: stare@lonex.rl.af.mil
Rome Laboratory
:-) These are the opinions of my evil twin, skippy (-:

Newsgroups: comp.graphics
From: mhieb@panix.com (Michael Hieb)
Subject: xv-2.21 on SysVr3.2
Summary: need help compiling xv-2.21 on SysVr3.2
Date: Fri, 31 Jul 1992 11:43:48 GMT
Organization: PANIX Public Access Unix, NYC
Keywords: xv-2.21 SysVr3.2 tiff

 receive the following errors when attempting to compile xv-2.21. They occur
when attempting to compile the tiff portioj of the program after cd'ing
into the tiff directory and typing make.

# make
        cc -Dunix -I/usr/include/X11 /usr/include/lan /usr/include . -DUSE_VARAR
GS=1 -DUSE_PROTOTYPES=0 -DHAVE_IEEEFP=1  -DCOLORIMETRY_SUPPORT  -DYCBCR_SUPPORT
  -c tif_fax3.c
"./tiffioP.h", line 39: syntax error
"./tiffioP.h", line 39: cannot recover from earlier errors: goodbye!
*** Error code 1

Stop.

I can find no clue as to what the problem might be in tiffioP.h. Any help would be greatly appreciated.

Michael

Xref: sparky comp.graphics:8128 alt.graphics.pixutils:1807
From: rene@hardy.u.washington.edu (Rene Magritte)
Newsgroups: comp.graphics,alt.graphics.pixutils
Subject: PoV newsgroup or mailing list?
Summary: wondering
Keywords: mailing list
Date: 24 Jul 92 20:47:28 GMT
Organization: University of Washington


  
     	Particularly now that POV 1.0 has been released, I was
wondering if anyone knows of an existing or planned newsgroup or
mailing list to support this raytracer.  One would think that people
would be interested in such a group.... 
  
 	rene@hardy.u.washington.edu
From: spahnv@uhura.aston.ac.uk (Volker Spahn)
Newsgroups: comp.graphics
Subject: Decomposition of Wireframes into Primitives Problem
Date: 27 Jul 92 16:48:56 GMT
Organization: Aston University

Hi

I have a problem concerning decomposition of 2D or 3D 
polygones into primitives like cubiods, or pyramids.

The problem is to find an algorithm which extracts 
some primitives from a 2D or 3D wireframe representation.
The wireframe data is produced by input of three 2D 
engeneering drawings and the aim is to reconstruct them 
into 3D CSG models.

If anyone knows an article or a book which deals with 
that problem please EMail to me.

Thanks in advance

Volker



-- 
Volker Spahn    	Internet: spahnv@cs.aston.ac.uk
Aston University 
Birmingham, UK
Newsgroups: comp.graphics,sci.comp-aided,sci.med
From: eafg@athena.mit.edu (Ted A Gibson)
Subject: Software teaching aids for human anatomy
Organization: Massachusetts Institute of Technology
Date: Thu, 23 Jul 1992 19:21:49 GMT

I am working on a software teaching aid for human functional anatomy
for medical students.  I am interested in finding out what else is
available.

I am aware of two existing computer aided anatomy teaching packages.
These are: "Bodyworks" for PCs by SoftWare Marketing Corp. and a Mac
Hypercard package.

If anyone knows of other related software packages that are either
available or under development, I would appreciate any information
that you could give me.

Thanks,
            Sarah Gibson
            Neuman Biomechanics Lab
            MIT
            gibson@imager.mit.edu
From: lusardi@sybil.cs.Buffalo.EDU (Christopher Lusardi)
Newsgroups: comp.graphics
Subject: Reversal of Hough Transform?
Date: 22 Jul 92 22:24:13 GMT
Organization: State University of New York at Buffalo/Comp Sci
Originator: lusardi@sybil.cs.Buffalo.EDU

A straight line can be parametrically described as:
	rho = x * cos(phi) + y * sin (phi)
where rho is the normal distance of the line from the origin and phi is 
the angle of the origin with respect to the axis.

The Hough transform maps (rho, phi) coordinates to an array for determining 
lines. I.e: If an array element has a specific number of hits in the
parametric domain then we have a line and not noise etc.

Questions: (1) How do I accurately get back the original line?
	   (2) Are there any algorithms for the quantization steps of
	       rho and phi?

(Does anyone also have references.)

						Thank you,
-- 
Christopher M. Lusardi     University At Buffalo  lusardi@sybil.cs.buffalo.edu
From: aktihan@trbilun.bitnet (Murat Aktihanoglu)
Newsgroups: comp.graphics
Subject: Computer Animation papers/theses ?
Keywords: Computer Graphics, Computer Animation.
Date: 26 Jul 92 18:07:20 GMT
Organization: University of Bilkent-Computer Center  ANKARA/TURKEY

Are there any FTP sites with papers/theses on

    Computer Animation ?


Thanx.
Murat Aktihanoglu.Bilkent University.Ankara.Turkey

--------------------------------------------------------
E-mail : aktihan@trbilun.bitnet    #include<std_claimer>
--------------------------------------------------------
From: n9149717@henson.cc.wwu.edu (gregg t. oetting)
Newsgroups: comp.graphics
Subject: solids modeling toolkit?
Keywords: solids modeling
Date: 26 Jul 92 23:08:54 GMT
Article-I.D.: henson.1992Jul26.230854.23230
Organization: Western Washington University


I am looking for a boundary representation solids modeling toolkit to be
used for my graduate thesis. Preferably, written in C. Does anybody know
of a free system that is avaliable? Any information would be appreciated.
Thanks. 
Xref: sparky comp.graphics:8247 comp.windows.x:14543 comp.windows.open-look:3271
From: ksk@ksksun.ca.aecom.yu.edu (Ken Krauter)
Newsgroups: comp.graphics,comp.windows.x,comp.windows.open-look
Subject: tiff file conversion
Keywords: tiff, raster, 16-bit, grayscale
Date: 28 Jul 92 20:05:20 GMT
Reply-To: ksk@ksksun.ca.aecom.yu.edu
Followup-To: comp.graphics
Organization: Albert Einstein College of Medicine

I DESPARATELY need to convert 16-bit grayscale tiff images to 8-bit for use in a
variety of drawing and presentation programs.  It seems that Leffler's libtiff tools, pbmplus, UCSD,
Image Alchemy, MIFF tools, and the UTAH converters all accept as input only 8-bit 
grayscale images.  I realize that converting from 16 -> 8 loses dynamic range but this is a loss
I must accept in order to view the images in any standard package.  I am not a graphics programmer
so I cannot easily modify tiffcp or tifftopnm myself (I can figure out the place in the code to do this,
but haven't a clue about how to ultimately manipulate the bits and the header information to 
produce a useable file).  Any help would be greatly appreciated.

ken krauter
ksk@ksksun.ca.aecom.yu.edu



From: dclaar@hpcuhe.cup.hp.com (Doug Claar)
Date: Wed, 29 Jul 1992 00:27:11 GMT
Subject: Re: Address of COREL wanted...
Organization: Hewlett Packard, Cupertino
Newsgroups: comp.graphics

>/ hpcuhe:comp.graphics / IFF291@DJUKFA11.BITNET (Stephan Petersen) / 11:56 am  Jul 22, 1992 /
>
>(I'd like to enquire about their UNIX version of Corel Draw, btw.
>There isn't by chance anybody from COREL out there listening :-) ?)

The demo copy of CorelDraw that I just got says: 

    ported to UNIX by PRIOR DATA SCIENCES.

It is corel draw 2.0, not the latest 3.0 version. The order sheet
says it is available for:
   
   DECstation 3100 & 5000
   DG AViion
   HP Apollo Series 400
   HP Apollo Series 700
   IBM RS/6000
   Intergraph
   SCO ODT
   Silicon Graphics
   Sun SPARCstation (motif widgets)
   Sun SPARCstation (OPEN LOOK widgets)

Their vital stats:

   PRIOR DATA SCIENCES
   PRODUCT SALES INC.
   240 Michael Cowpland Drive
   Kanata, Ontario, K2M 1P6
   (800) 267-2626
   FAX: (613) 592-1278

As to how it works, I can't tell you:  The "HP Apollo Series 400"
version requires hp-ux 8.0, and I'm only on 7.05, and won't be able to
upgrade for awhile.  (sigh) In theory, the "Series 400" version should
run on 300s as well, but the "Series 700" version probably won't work
on the 800s, unless they were careful to set some compatiblity flags.

--Doug Claar
Newsgroups: comp.graphics
From: kaustine@nbrwh34.bnr.ca (Mathew Kaustinen)
Subject: Re: Hidden surface removal (to Mathew Kaustinen)
Organization: Northern Telecom, Bramalea, Canada
Date: Fri, 31 Jul 92 18:11:37 GMT

In article <1992Jul31.161407.8635@tc.cornell.edu> elan@tasha.cheme.cornell.edu (Elan Feingold) writes:
>
>My e-mail to you bounced, so here's the letter:
>
Ya, I don't think you can e-mail me ...
>
>
>Hum, I'm beginning to seriously wonder.  The problem was that for example,
>if I had a long polygon going up, and a little polygon visually in
>front, and the viewpoint was up above somewhere, the algorithm would draw
>the small polygon first, because the average Z value was smaller
>(since the large polygon protruded up towards the viewpoint), and the
>minimum z was a tie (since they were adjacent in the height field),
>so that wouldn't work either.
>
Got it! :) There's a tie in minimums you say? Take the dot product of
the surface normal (Remember: same direction of rotation for all surfaces)
with the viewing vector. If the Dot Prod is positive (or is neg, I can't
remember), you know that the surface is facing away from you and you
should draw this one first!                              
>>I used this method on a Bezier surface program I wrote and it
>>seemed to work for this application.
>
>Was the program PD?  If so I'd like to have a look.  I always like a good
>graphics program.
Sure you can have it. It was part of an assignent in a Computer
Graphics course I took in school (Queen's Rules). User interface sucks
and its written with some Turbo C specific Video Function (FillRect etc.),
but if your interested, give me a call. (I'm new with this trn, FTP etc
stuff so I don't know how to get it to you)
Regards,

- I am _NOT_ an official spokesperson for Northern Telecom -
-- 
Mathew A. Kaustinen          |      ESN:   (333) 2066
Field Service Engineering    |      PHONE: 416-452-2066
Northern Telecom, Bramalee   |      PAGER: 416-378-3246
Newsgroups: comp.graphics,sci.image.processing
From: kirk@braille.uwo.ca (Kirk Reiser)
Subject: need help with tiff format!
Organization: University of Western Ontario
Date: Sat, 25 Jul 1992 15:37:32 GMT
Keywords: tiff, file formats


I have been using a number of programs which depend on image files
stored in the "tiff" format.  I have run into problems moving these
files between programs because, it appears, there are a number of
different "tiff" formats.  I have found references to three types so
far: "tiff uncompressed", "tiff compressed" and "tiff class F".  Could
someone please fill me in on just how many "tiff" formats there are,
and possibly the specs for said formats?

Any help you would supply, is certainly appreciated.
  Kirk
-- 
Kirk Reiser				The Computer Braille Facility
email:   kirk@braille.uwo.ca		room H045 Health Sciences Addition
phone: (519) 661-3061			University of Western Ontario
					London Ontario N6A 5C1
Xref: sparky comp.graphics:8209 sci.image.processing:238
From: jack@admin.mport.COM (Jack Craig)
Newsgroups: comp.graphics,sci.image.processing
Subject: Re: need help with tiff format!
Keywords: tiff, file formats
Date: 27 Jul 92 20:27:40 GMT
Followup-To: comp.graphics
Organization: Microport Inc., Scotts Valley, CA 95066 US of A

yeah, there are a number of tiff record types as well as the
option of creating some. i got a real good book from the hp folks
while working on their optic scanner. their tiff fileformat description
was extremely helpful(albeit geared for software development).

try sandy wakeman, 303-350-4393 (i think it is, sometimes monday memory
isnt so hot). [let me know if i misquoted and i'll look it up]

jack...
=============================================================================
 Jack Craig               Aptos, California, 95003  
 Software Horizons,Inc.   408-684-1375    uunet!sco.com!blznrzn!jack    SVR32
 Microport                800-FOR-UNIX    uunet!mport.com!jack          SVR40
=============================================================================
Newsgroups: comp.graphics