HDTenEightyP/NetNews huggingface dataset:
From: David Patten
Subject: Postscript to IGES converter
Organization: Motorola Inc.
Distribution: usa
Date: Fri, 4 Sep 1992 13:08:08 GMT

Greetings,
Does anyone know of a program to convert Postscript to IGES. I know
a lot of Postscript code can't be converted such as bitmapped data,
fills and line weights, etc. but the parts I'm interested in should 
cross over. They both have lines, arcs, Bezier curves.
Any information would be appreciated.

/**********************************************************/
/* David Patten                   | Voice: (708) 632-4134 */
/* Motorola Inc.                  | FAX:   (708) 632-6269 */
/* Cellular Subscriber   S368     | EMAIL: davidp@mot.com */
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From: va655217@LANCE.ColoState.Edu (venkata ramana annadata)
Newsgroups: comp.graphics
Subject: Re: PARALLAX VIDEO CARDS
Keywords: parallax xvideo jpeg
Date: 1 Sep 92 19:27:44 GMT
Organization: Colorado State U. Engineering College

I am looking for some software(freeware or payware) on Hidden Line Elimination,
to handle a large volume of data about (50000 primitives). I shall also 
appreciate if I could get some pointers to recent developments and alogorithms
in this area to handle such data.
		Thanks,

						Ramana
						
Newsgroups: comp.graphics
From: jim@lillee.cs.curtin.edu.au (Jim McGrady)
Subject: TIFF -> binary converter wanted
Keywords: TIFF
Organization: Curtin University of Technology
Date: Wed, 26 Aug 1992 05:19:07 GMT

Hi All

I am looking for some UNIX C source that will take a TIFF bi-level file
and convert it to straight binary, ie; one bit per pixel to indicate B/W
and only enough extra information to define image hight and width.

If anyone has such a program, or has info on how to read a TIFF file
directly to achieve the same thing, please mail me.

Thanks in Advance

Jim
From: newberry@newton.as.arizona.edu (Mike Newberry)
Newsgroups: comp.graphics,comp.visualization
Subject: Speedstar 24x and other such cards
Date: 1 Sep 92 20:00:07 GMT
Organization: University of Arizona, Tucson, AZ


All this detailed discussion about the new "SVGA" cards is somewhat dizzying.
Does anyone have a postable summary of features of the new cards that use
the ET-4000, the new 4MB ET-4000, the S3, and the W.D. 9031 controllers?
The following info would be useful:


card name, controller, #colors @ resoution, VRAM or DRAM


Mike Newberry
newberry@as.astro.arizona.edu
From: hsu@crl.dec.com (William Hsu)
Newsgroups: comp.graphics
Subject: Re: SIGGRAPH member benefits
Date: 31 Aug 92 19:58:18 GMT
Organization: DEC Cambridge Research Lab

For those who don't like the "glitz" of SIGGRAPH, or want to focus soley on 
the technical or academic aspects of graphics, just don't go to the exhibit.
There's plenty of stuff in the papers and panel sessions, BOFS, workshops,
and Showcase, Exhibitor are showy and glitzy to draw people's attention.
That's the nature of their business (or more like the nature of the buyer).

Re: Steve Lamont writes:
 An example:  As I mentioned above, my lab was a collaborator with the
 San Diego Supercomputer Center and The Scripps Research Institute in a
 SIGGRAPH Showcase project (The Distributed Laboratory --
 Electron-telemicroscopy -- it was written up in June CACM if you want
 details).  In one memo we received from the Showcase management we
 were exorted "to put on a good show" (my paraphrase but I believe
 accurate in substance) and not treat Showcase as a poster session
 because we were "competing" with the hoo-hah of the manufacturer's
 exhibits.

I think this was meant as a helpful comment. Had you treated your showcase
demo as a poster session and just sat there, people would have just past 
you by to watch more interesting things. (I, too, was a Showcase participant)
Though I don't remember the specific message, it doesn't sound like they
condoned what the exhibitors did, just warned you about it.

Re: Samuel Uselton
As Sam, and many other people notice, the exhibitor floor space was MUCH smaller
than previous years. That's where a lot of money is generated, and that is where
the recession showed a lot.

Trying to keep expressing my opinions brief,
William
(The usual "my own opinion" disclaimer....)
-- 
=============================================================================
William Hsu				Watch out for those 18-wheelers....
Digital Equipment Corporation
hsu@crl.dec.com
=============================================================================
Newsgroups: comp.graphics
From: pirhonen@bambam.es.com (Kerry Pirhonen)
Subject: 3D polygon globe data
Followup-To: poster
Organization: Design Systems Division, Evans & Sutherland, SLC, UT
Date: Thu, 27 Aug 92 20:55:47 GMT

Does anyone have 3D polygonal data of the globe?   If so, please reply
to pirhonen@dsd.es.com




Newsgroups: comp.graphics
From: thibault@kira.emba.uvm.edu (Scott A Thibault)
Subject: Help with illumination models
Organization: University of Vermont, EMBA Computer Facility
Date: Thu, 3 Sep 1992 12:24:18 GMT


  I want to implement an image generation program but I have a couple of 
problems.  The first problem is with microfacet distribution.  I'm using Roy
Hall's book, and he uses a parameter beta in the microfacet distribution, but
how do you specify this parameter for a given material.
  Second I need to find out more about patch sub-division, in the context of
the radiosity model, does anyone out there have any references.

Thanks for any help.
--Scott Thibault
University of Vermont
thibault@emba.uvm.edu
Newsgroups: comp.graphics,comp.sys.ibm.pc.hardware
From: morley@camins.camosun.bc.ca
Subject: Re: 486 external cache
Organization: Camosun College
Date: Thu, 27 Aug 1992 20:32:27 GMT

In article <jburney.714920310@seamis1>, jburney@seamis1.gsfc.nasa.gov
(Jeff Burney) writes:
> I have read articles that indicate a negligible difference in performance
> between 64k and greater, instruction caches.  So 128k is pretty much overkill.

This cache is used for many things, not the least of which is a video memory
cache.  On my 486/50 with 64K cache my graphics routines ran fairly
quickly.  When I upgraded to 256K cache, they ran much faster.  Nothing
else was changed in my setup or routines.

> Just my opinion,
> --
> Jeff Burney                     SES, Inc.  301-439-6617        
> jburney@seamis1.gsfc.nasa.gov   NASA/Goddard Space Flight Center 
> jburney@hydra.nodc.noaa.gov	NOAA/National Oceanographic Data Center

MARK
morley@camins.camosun.bc.ca
From: stgprao@st.unocal.COM (Richard Ottolini)
Newsgroups: comp.graphics
Subject: Re: Quality of image conversion
Date: 27 Aug 92 18:13:12 GMT
Organization: Unocal Corporation

In article <1992Aug27.154824.17492@cbfsb.cb.att.com> nqn@cbnewsb.cb.att.com (nam.q.nguyen) writes:
>Folks,
>A friend of mine is doing experiments transferring computer images to
>VHS video cassettes.  He experiences a loss of image quality after the
>transfer.  Hardware is a 486 PC with SVGA monitor.  Software used to
>generate the image is: Animation and Autodesk Animator (version 1.0 and
>2.0).  What are ways to improve the quality of this process?

There will be a loss due to information constraints.
The amount of information you are specifying in VGA is something like
640 x 480 x 60 x 8 = 1.47 gigabits per second.
The fundamental law of information says you have to have an analog encoding
scheme of twice that rate to fully capture that information.
However standard TV broadcast signal is 3.5 megahertz and VHS 1-1.5 megahertz
of signal, so you are getting 0.1% of the orginal information.
Fortunately, very few monitors can display more than a 100 megahetz of info
a second- some information is blurred.  Furthermore, the human eye is fairly
forgiving and can be fooled into an illusion of color and motion at a 1 meghertz
rate.  As you have observed, the eye can cetainly tell the difference between
a 10+ megahertz monitor and VHS tape.  Most people can tell the difference
between broadcast and videotape rates.

More directly answering your question, you are probably not even getting the
best 1.5 megahetz of your images onto VHS.  A direct RGB to NTSC convertor
helps.  Some more expensive PC boards, those used for video, have these.
If you can get access to super-VHS (3 MHz) or HDTV (10 MHz) video recording
that will help too.
Newsgroups: comp.graphics
From: x0y3510@tamuts.tamu.edu (Xuejun Yang)
Subject: Re: Weiler Polygon Clipping Algorithm
Keywords: variational geometry
Organization: ~/lib/organization
Date: Thu, 27 Aug 1992 15:49:23 GMT



I have received a lot of responses for the same algorithm. Unfortunately
nobody has yet responded with an answer.

I just got the 2nd edition of Computer Graphics: Principles and
Practice by Foley and van Dam etc. It indeed has a complete 
description of what I want. Unfortunately it is a monstrous algorithm.
It is from pages 937-945. Has anybody tried out this one in C.
I don't know if I can handle it in a short time period.

If anybody got it working, it would be wonderful if it can be shared
.


Newsgroups: comp.graphics
From: barry@geovision.gvc.com (Barry Comer)
Subject: price of software
Organization: Not officially GeoVision Systems Inc., Ottawa, Ontario, Canada
Distribution: na
Date: Thu, 3 Sep 1992 13:38:01 GMT

Folks:

	I was wondering about prices of a few animation
packages that run on the PC or Unix machines.  These
packages should include a user interface for designing
objects and sequences of motion.  They should include 
things like texture mapping and the like.  If you 
have any information that might be useful, please take
the time to pass it on to me.  This software would be 
used by a single person on a single machine.

thanks in advance
Barry Comer
From: spl@pitstop.ucsd.edu (Steve Lamont)
Newsgroups: comp.graphics
Subject: Re: SIGGRAPH member benefits
Date: 29 Aug 1992 20:10:20 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
NNTP-Posting-Host: pitstop.ucsd.edu

In article <1992Aug28.224230.14317@uc.msc.edu> jc@uh.msc.edu (JC) writes:
>The attendance records were broken by the large number of people attending
>the exhibition.  Fewer people than usual attended courses, or even the
>papers and panels sessions, which are the real money-makers.

Could this have something to do with the quality of the courses and/or
paper/panel sessions?  While I didn't attend this year (as a
participant in Showcase I had to be on this end to manage the control
of the electron microscope and be on hand in case anything broke), my
collegues who did attend did indicate that they felt that the overall
technical quality of the program was down from years past.  Of course,
your mileage may vary.

Again, I'm a little concerned with the tendency of SIGGRAPH to go
overboard on the showbiz aspects of things, perhaps to the
detriment of the technical/academic side of the program.  (By
"showbiz," I don't mean the entertainment industry, which has indeed
contributed greatly to the advancement of the art and science of
computer graphics) but the gee-whizzery and out-and-out hype that
seems to surround the Conference.)

An example:  As I mentioned above, my lab was a collaborator with the
San Diego Supercomputer Center and The Scripps Research Institute in a
SIGGRAPH Showcase project (The Distributed Laboratory --
Electron-telemicroscopy -- it was written up in June CACM if you want
details).  In one memo we received from the Showcase management we
were exorted "to put on a good show" (my paraphrase but I believe
accurate in substance) and not treat Showcase as a poster session
because we were "competing" with the hoo-hah of the manufacturer's
exhibits.  In my opinion, this was an example of the "style over
substance" mentality that seems to be prevalent among the SIGGRAPH
Conference management.  My boss, who was a panelist and did attend,
expressed a great deal of surprise at the circus-like atmosphere,
particularly in comparison with the academic conferences that he
normally attends.

[The above, of course, is my personal opinion and not that of the San
Diego Microscopy and Imaging Resource, the University of California,
the San Diego Supercomputer Center, or The Scripps Research Institute,
should any of those august entities actually even *have* opinions.]

							spl
-- 
Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@dim.ucsd.edu
UCSD Microscopy and Imaging Resource/UCSD Med School/La Jolla, CA 92093-0608
"O generation of the thoroughly smug/and thoroughly uncomfortable...
.. the fish swim in the lake/and do not even own clothing." - Ezra Pound
Xref: sparky comp.graphics:9203 sci.image.processing:554
From: nqn@cbnewsb.cb.att.com (nam.q.nguyen)
Newsgroups: comp.graphics,sci.image.processing
Subject: Quality of image conversion
Date: 27 Aug 92 15:48:24 GMT
Followup-To: poster
Organization: AT&T

Folks,
A friend of mine is doing experiments transferring computer images to
VHS video cassettes.  He experiences a loss of image quality after the
transfer.  Hardware is a 486 PC with SVGA monitor.  Software used to
generate the image is: Animation and Autodesk Animator (version 1.0 and
2.0).  What are ways to improve the quality of this process?
Thanks a lot.

Nam Nguyen
Newsgroups: comp.graphics
From: mpdillon@uuisis.isis.org (Michael Dillon)
Subject: good books with algoritms??
Organization: International Shared Information Service (Ottawa)
Date: Fri, 04 Sep 92 06:43:50 GMT

I am looking for a few *GOOD* books with algorithms for 2D graphics.
This includes, general ellipse, rectangle, straight lines, bezier curves
spline curves, polygons, filling of objects, clipping (including
clipping to a polygon), font rendering, etc...
 
Hopefully, this will include just about all the algorithms one would
use in writing a Postscript interpreter, or an X server, or MS-Windows.
Please don't refer me to ghostscript, or the X11R5 tapes. I need 
algorithms with explanations of how and why, not source code.
 
Although, I *WOULD* like to know of code that implements some sort
of general graphics library. Commercial products cannot be used
because I intend to make sources of the finished product freely available.
 
If this is a FAQ, I apologise in advance. If not, I will summarise
responses to the net.
 
Have fun!
Newsgroups: comp.graphics
From: haseka@aix.rpi.edu (Atilla A Hasekioglu)
Subject: multimedia
Organization: Rensselaer Polytechnic Institute, Troy NY
Date: Mon, 31 Aug 1992 21:29:28 GMT

Newsgroups: comp.windows.x.apps
Subject: multimedia
Summary: 
Followup-To: 
Distribution: world
Organization: Rensselaer Polytechnic Institute, Troy NY
Keywords: 

I am looking for a multimedia software that compresses images and has mailing 
options. This should be in Xwindows. I have images in many formats.
I would like to be able to change their formats and have printouts. I also
would like to be able to view them. The software I am looking for should
have all these options. I also would like to have the option to decompress and
view the image from where it is sent by mail, so this will be a two sided
software that can be used both by the sender and receiver  side.
  If anybody can help me,I will very much appreciate it.
Newsgroups: comp.graphics
From: leung@cs.UAlberta.CA (Jian-Dong Liang)
Subject: Re: 3d rotation about an arbitrary axis: how?
Organization: University of Alberta
Date: Mon, 31 Aug 1992 17:46:35 GMT

In article <87331@netnews.upenn.edu> ledogar@eniac.seas.upenn.edu (Charles Ledogar) writes:
>My visualization package now needs a flight-simulator-like viewpoint
>control.  I have the viewpoint and viewdirection as 3d vectors in object 
>space.  I need to rotate the viewdirection vector, for example, "down" wrt to
>the current viewdirection.  I've figured out the vector for the axis
>(say, (1,3,2) ) of rotation but I don't know the rotation matrix
>for rotation about that non-basic axis.  I'd rather not have to convert
>to eye-coordinate space.
>
>I vaguely remember some kind of matrix formula for which the familiar x-,
>y-, and z-rotation matrices were but special cases.  Does such a 
>formula exist?  Something about "Euler angles"...
>
>---Charlie Ledogar
>ledogar@eniac.seas.upenn.edu

This can be done using quaternions.

A rotation of magnitude theta around an arbitrary axis (x, y, z)
corresponds to a unit quaternion q=(q0, q1, q2, q3), where

        q0 = cos (theta/2),
        q1 = x * sin (theta/2),
        q2 = y * sin (theta/2),
        q3 = z * sin (theta/2),

assuming (x, y, z) is a unit vector itself. A quaternion q of
the above form corresponds to the following premultiplied rotation matrix:

| q0^2+q1^2-q2^2-q3^2   2(q3q0+q1q2)            2(q1q3-q0q2)            |
| 2(q1q2-q0q3)          q0^2-q1^2+q2^2-q3^2     2(q1q0+q3q2)            |
| 2(q1q3+q0q2)          2(q2q3-q0q1)            q0^2-q1^2-q2^2+q3^2)    |

Jiandong Liang
leung@cs.ualberta.ca
From: mitzel@caldera.usc.edu (Danny Mitzel)
Newsgroups: comp.graphics
Subject: Looking for algorithm for automated graph layout
Date: 1 Sep 1992 12:09:45 -0700
Organization: University of Southern California, Los Angeles, CA
NNTP-Posting-Host: caldera.usc.edu

I'm using a program that generates different network topologies, that
I'm feeding into a computer network simulator.  The network topology
consists of a set of switching nodes and links, with the nodes
organized into a small number of hierarchical levels [typically 1 -
3].

The simulator can display a representation of the network in an X
window if given coordinate information.  I'm interested in any
info/algorithms/papers that suggest methods on how to automatically lay
out the nodes within a rectangular coordinate system, the idea being
that related nodes [connected to the same higher level node] are
clustered together, and the whole thing is layed out to present some
level of readability.

I would imagine that some type of work has been done in this area for
simple undirected graphs, which should give me a good starting point.
Can anyone help me out?

thanks,
danny (mitzel@usc.edu)
Newsgroups: comp.graphics,comp.graphics.visualization,comp.sys.ibm.pc.hardware
From: jsw@microunity.com (Jeff Weinstein)
Subject: Re: Looking for polygon engine hardware
Organization: MicroUnity Systems Engineering, Inc.
Date: Mon, 31 Aug 1992 21:24:34 GMT

In article <1992Aug31.141110.12707@thunder.mcrcim.mcgill.edu>, panisset@lightning.mcrcim.mcgill.edu (Jean-Francois Panisset) writes:
> In article <1992Aug30.033019.26946@mnemosyne.cs.du.edu> wdwells@nyx.cs.du.edu (David "Fuzzy" Wells) writes:
> >Won't the IRISVision cards do this? 
> 
> I may be wrong, but I think the IRISVision product line (i.e. the equivalent
> of Personal Iris graphics on a PC adapter) was dropped by SGI not long after
> it was introduced. In my mind, such a product just does not make a lot
> of sense when you look at the price of an Indigo...

  The IRISVision product has been picked up by pellucid, inc.  They are a
startup founded by some ex-sgi employees.

	--Jeff

-- 
Jeff Weinstein - X Protocol Police
MicroUnity Systems Engineering, Inc.
jsw@microunity.com
Any opinions expressed above are mine.
From: u7811091@cc.nctu.edu.tw (IC YANG)
Subject: JPEG format? (Was Re: Tiff format description wanted)
Organization: National Chiao Tung University
X-Newsreader: Tin 1.1 PL4
Date: Wed, 2 Sep 1992 11:29:49 GMT

elias@corton.inria.fr (Banska Bystrica) writes:
: Hi!
: I am looking for TIFF format description. Can you 
: help me ? Thanks.
: Lubos Elias
: 
: elias@uakom.cs
: elias@corton.inria.fr
: 

Hi there,
    I know that tiff format(5.0, not 6.0) can be found at
 wuarchive, in directory  pub/msdos/tiff.  But can any one
 tell me where to find jpeg files' format?  Thanks a lot.
 We have a project to do jpeg encoder and decoder,  and I
 wish our file's format can be consistent with others.

============================================================
IC Yang 			 (u7811091@cc.nctu.edu.tw)
Room 216, Dorm. 12
EE dep of National Chiao-Tung University
Hsin-Chu, Taiwan, ROC. 

Newsgroups: comp.graphics
From: jmeads@bnr.ca (Jon Meads)
Subject: Re: SIGGRAPH member benefits
Organization: Bell-Northern Research
Date: Thu, 27 Aug 1992 20:41:46 GMT

In article <1992Aug26.202245.18060@koko.csustan.edu> rsc@altair.csustan.edu
(Steve Cunningham) writes:
 ....
 >  However, ACM is developing a policy that will mandate that 
 > SIGs fully fund all member benefits from member dues.

This seems like a rather dumb thing to do. I can see a mandate that a SIG
define the guaranteed benefits which you get for paying dues and clearly state
what are additional benefits which are provided at the SIGs option. But not to
allow a SIG to provide added benefits when feasible is beyond silly.

Are you sure you got that right?

jon
.......................or..........................................
Jon Meads              :: Jon Meads              : WK: 613-763-4459
MS 054, Dept 0K12      :: MS 054, Dept. 0K12     : FX: 613-763-2626
Bell-Northern Research :: Bell-Northern Research :
PO Box 3511, Station C :: PO Box 402             :  jmeads@bnr.ca
Ottawa, Ontario        :: Ogdensburg, New York   :
Canada   K1Y 4H7       :: USA   13669-0402       :
.......................::........................:.................
** Message contents are my personal views and expressions, **
** not BNR's.                                              **
Newsgroups: comp.graphics,news.groups
From: hollasch@kpc.com (Steve Hollasch)
Subject: Re: CFV: comp.graphics.opengl
Followup-To: news.groups
Summary: I think we missed an RFD here.
Organization: Kubota Pacific Computer, Inc.
Date: Tue, 1 Sep 1992 16:33:22 GMT

bglazier@buffalo.asd.sgi.com (Buffalo Bill Glazier) writes:
| GROUP:  comp.graphics.opengl
| 
| STATUS: Unmoderated
| 
| CHARTER:  This is the initial Call For Votes (CFV) on the proposed new
| newsgroup comp.graphics.opengl. 

    Did I miss something?  I never saw an RFD for this newsgroup.  Was it
posted to something other than comp.graphics or news.groups?  Was this
newsgroup placed up for discussion under a subject line that didn't
contain the proposed name or the word RFD?

______________________________________________________________________________
Steve Hollasch                                   Kubota Pacific Computer, Inc.
hollasch@kpc.com                                 Santa Clara, California
From: wa2sff@cbnewsh.cb.att.com (joseph.e.wilkes)
Newsgroups: comp.graphics
Subject: Videologic DVA format
Date: 3 Sep 92 15:05:09 GMT
Organization: AT&T

I am using a videologic video capture board with the MIC utilities.
The video image is captured in a proprietary format called DVA.
Support for this board is poor.
Does anyone have any information on the DVA format?
Thanks.
Joe Wilkes
From: neiderer@amsaa-cleo.brl.mil (Andrew Neiderer)
Newsgroups: comp.graphics
Subject: terrain rendering
Keywords: global illumination, terrain
Date: 3 Sep 92 15:51:45 GMT
Organization: U.S. ARMY MATERIEL SYSTEMS ANALYSIS ACTIVITY (AMSAA), APG, MD.


All radiosity scenes that I have come across have been rooms, ie interior
scenes.  Can radiosity techniques be applied to outdoor scenes, or doesn't
this make sense ?  Seems to me that as long as you define a bounding sphere
of the world of some radius, you can describe an equilibrium condition there
as well.  I probably just don't know enough about this rendering technique.
Maybe someone can set me straight.

I am trying to visualize terrain, which is obviously diffuse.  I have pro-
grammed most popular local shading functions, but I want to be accurate as
possible.  Professor Nakamae of the Hiroshima University has researched this
area, but I can't seem to locate any useful (English) references.  Any advice
is appreciated.

- Andy Neiderer
Newsgroups: comp.graphics