HDTenEightyP/NetNews huggingface dataset:
From: newberry@newton.as.arizona.edu (Mike Newberry)
Newsgroups: comp.graphics
Subject: Re: What is a good book for Digital Image Processing?
Date: 28 Aug 92 23:36:19 GMT
Organization: University of Arizona, Tucson, AZ

In article <17lb41INNik7@network.ucsd.edu> spl@pitstop.ucsd.edu (Steve Lamont) writes:
>In article <1992Aug27.172834@firewalladaclabs.com> jlc@firewalladaclabs.com (Jean-Luc Chatelain) writes:
>>Digital Image Processing
>>by Williwam K Pratt
>>Prentice and Hall (I think)
>>
>>This is one of the bibles (along with one by Gonzales)
>
>Pratt, William K., _Digital Image Processing, Second Edition_.  New
>York, John Wiley and Sons. (1991) ISBN 0-471-85766-1
>
Yes, but has anyone ever tried to get "useful" information out of this 
book?
Newsgroups: comp.graphics
From: salc@shearson.com (Sal Cataudella)
Subject: Line / Polygon intersection algorithm
Reply-To: salc@shearson.com
Organization: Lehman Brothers, Inc.
Date: Wed, 26 Aug 1992 19:28:11 GMT

Hi folks,
	Given a line segment represented by 2 points  and a polygon represented
	as a list of vertices ( all in 3D )
	- Does anybody have an algorithm for determining if a line intersects a polygon ?

thanx in advance,

--sal
	
---
 ######################################################
 ######################################################
 ######################################################
From: zhu@graphack.asd.sgi.com (Benjamin Zhu)
Newsgroups: comp.graphics
Subject: Graphics Gems IV
Date: 4 Sep 92 00:28:56 GMT
Organization: Silicon Graphics, Inc.


Can someone send me the call for contribution for Gems IV? Thanks
a lot.

Ben

--
Benjamin Zhu       ;;; Priest of microcode and 'self-appointed' bug terminator
Silicon Graphics, Inc.   ;;; ``Just call my name, I will be there.''
zhu@graphack.asd.sgi.com ;;; ``Projective geometry is all geometry.'' - Cayley
(415) 390-1187           ;;; ``Learn forever, young forever.'' - Anonymous
Newsgroups: comp.graphics
From: jester@crash.cts.com (Ken Bibb)
Subject: Looking for 3ds2rib filter (SECOND TRY)
Date: 26 Aug 92 17:38:11 GMT


I got no responses to my first request so here's a second attempt.

I'm looking for a 3D Studio to RIB converter for a friend.  He says that it's
called 3ds2rib (I couldn't find it via archie).

Does anyone have this/know where I can get it?

Thanks!

--
jester@crash.cts.com
From: hubbold@cs.man.ac.uk (Roger Hubbold)
Newsgroups: comp.graphics
Subject: EUROGRAPHICS'92
Date: 28 Aug 92 08:40:16 GMT
Distribution: comp.graphics
Organization: Department of Computer Science, University of Manchester


****************************************************************************
*                   THERE'S STILL TIME TO REGISTER FOR                     *
*                            EUROGRAPHICS '92                              *
*                CAMBRIDGE, ENGLAND, 7 - 11 SEPTEMBER 1992                 *
****************************************************************************


The Eurographics Annual Conference is the leading European conference on
computer graphics, user interfaces, multimedia, computer animation,
visualisation and virtual reality, in a single forum. This year's event
will be held in Cambridge , England, from Monday 7th to Friday 11th
September.

The programme features two days of TUTORIALS, given by leading experts, a
three-day TECHNICAL PROGRAMME with invited papers, refereed technical
papers selected from a large number submitted from around the world, and
State of the Art Reports which offer updates on key areas, SLIDE, VIDEO AND
FILM SHOWS and competitions, and SOCIAL EVENTS offering a chance to meet
people with interesting ideas and views in the unique surroundings of
Cambridge. In addition to all of this there will be an EXHIBITION and an
industry-oriented seminar programme.

****************************************************************************
REGISTER NOW - FOR FURTHER INFORMATION CONTACT:

EG'92 Organisers
c/o Jane Thorp
The Registry
University of East Anglia
Norwich NR4 7TJ
UK

Tel: +44 603 592 802
Fax: +44 603 250 035
email: eg92-organiser@sys.uea.ac.uk

****************************************************************************

Copies of the programme may be accessed by anonymous FTP at siggraph.org
under the directory gen_info/announcements/conferences/eurographics_92

****************************************************************************
--
****************************************************************************
* Dr R.J. Hubbold,                             email: hubbold@cs.man.ac.uk *
* Department of Computer Science,                     Tel: +44 61 275 6158 *
* University of Manchester,                           Fax: +44 61 275 6236 *
* Oxford Road,                                                             *
* Manchester M13 9PL, UK.                                                  *
****************************************************************************
Xref: sparky comp.graphics:9407 comp.graphics.visualization:1299 comp.sys.ibm.pc.hardware:23322
From: chrisg@cbmvax.commodore.com (Chris Green)
Newsgroups: comp.graphics,comp.graphics.visualization,comp.sys.ibm.pc.hardware
Subject: Re: Looking for polygon engine hardware
Date: 3 Sep 92 12:15:55 GMT
Reply-To: chrisg@cbmvax.commodore.com (Chris Green)
Organization: Commodore, West Chester, PA

In article <1992Sep2.112611.29917@news.uni-stuttgart.de> andreas@awstar.rus.uni-stuttgart.de (Andreas Wierse) writes:
>I think Mike didn't just speak about fill-rate, but meant full 3D
>Gouraud shaded triangles. This means 20,000 * 3 matrix calculations to
>perform every second (if it's a triangle mesh ~ 20,000 +), the whole
>clipping stuff, color interpolation, polygon breakdown to spans and
>pixels etc.. I'm quite sure that even a fast 486 is not fast enough to
>render so much triangles.
>
	A 33/66mhz 486dx2 can perform over 200K (3x3)x(3x1) matrix multiplies 
per second (fixed point). Clipping (except for trivial reject and accept speed) is 
insignificant in any complex scene, as only a tiny percent of polygons
actually cross the clip boundaries. Trivial reject only cost 2 instructions
for the most common case (one subtract and branch). Trivial accept
eliminated the need for point coding most of the time.

	We were doing "flight-simulator" style graphics (meaning that the objects are
fixed and so pre-processing could be applied, resulting in an average cost of
4 multiplies per point transformed. All normals were scaled so that one component
was -1 or 1, so backface elimination (when not already handled by the optimized
bsp tree) was only 2 multiplies.

	Don't underestimate the power of the lowly 486 combined with fast
frame buffer access and clever coding.
-- 
*-------------------------------------------*---------------------------*
|Chris Green - Graphics Software Engineer   - chrisg@commodore.COM      f
|                  Commodore-Amiga          - uunet!cbmvax!chrisg       n
|My opinions are my own, and do not         - icantforgettheimpression  o
|necessarily represent those of my employer.- youmadeyouleftaholeinthe  r
|"A screaming comes across the sky..."      - backofmyhead              d
*-------------------------------------------*---------------------------*
Xref: sparky comp.graphics:9357 alt.graphics.pixutils:2083
From: sgoldste@usc.edu (Fogbound Child)
Newsgroups: comp.graphics,alt.graphics.pixutils
Subject: "Crisp" Scanner Recommendation
Date: 1 Sep 1992 14:39:09 -0700
Organization: University of Southern California, Los Angeles, CA
Distribution: world
NNTP-Posting-Host: aludra.usc.edu

Greetings Everyone!

I've been asked to research the renting or borrowing of a scanner for a
special project. This project involves scanning a set of Corporate Policy
papers for display on a variety of systems (X-Terminals, VGA PCs, Macs).
The representation should be graphical (ie, no OCR going on here).

So far, trivial. We have an Epson 300C available, that should work fine.

So the tricky part is it has to Look Really Cool[tm]. The main concern with
this project is image. The pages have to look like pages when they're
brought up, they have to be crisp and legible.

Now, most of the scans I've done for screen display are somewhat lacking in
the legibility department -- after all, most scans for screens are, what,
72 DPI resolution.

So the question is, is there some optimal way to scan (using the Epson),
is there some post-processing that will be effective in enhancing legibility
(without significantly altering the image), is there another scanner that
would outperform the Epson when scanning for screen display, or am I just SOL?

I'd appreciate any advice!
Thanks,
-- 
_________Pratice Safe .Signature! Prevent Dangerous Signature Virii!_______
Guildenstern: Our names shouted in a certain dawn ... a message ... a
              summons ... There must have been a moment, at the beginning,
              where we could have said -- no. But somehow we missed it.
Newsgroups: comp.graphics,comp.programming
From: thibault@kira.emba.uvm.edu (Scott A Thibault)
Subject: Re: Use SEGA Master System 3D glasses w/ computer?
Organization: University of Vermont, EMBA Computer Facility
Date: Tue, 25 Aug 1992 17:07:23 GMT

In article <1992Aug19.000129.22085@microsoft.com> ryb@microsoft.com (Danger Mouse) writes:
>The local Toys 'R' Us is clearing out old SEGA Master System video games
>that come with the light pistol and 3D glasses for $50.
>
>Has anyone tried hooking up the 3D glasses to their computer and worked
>out a programming interface?
>
>  -- Danger Mouse

Try looking at the file sega11.zip at wuarchive.wustl.edu in the directory
/pub/MSDOS_UPLOADS.  This file contain a description of how to connect the
glasses to a RS232 port and software for IBM compats. and sample stereo gifs.

Scott Thibault
thibault@emba.uvm.edu
Newsgroups: comp.graphics,comp.graphics.visualization,comp.sys.sgi
From: wnkretz@ikesg1.energietechnik.uni-stuttgart.de (Oliver Kretzschmar)
Subject: Looking for program to compute and display particle traces
Organization: IKE
Date: Tue, 1 Sep 1992 09:06:53 GMT



   Hey,

   I am looking for a public domain program, which computes particle
   traces and also displays them. Datafiles are 2 dimensional matrices
   with scalar and vector datas, so the display could be 2-dimensional.
   The program should running on a Personal SGI. Please mail me your
   informations !

   Thanks for your efforts

-- 
 Name : Oliver Kretzschmar   Inst.IKE / Uni.Stuttgart    /   @@ \   /   @@ \
 email: wnkretz@ikesg1.energietechnik.uni-stuttgart.de   \______// \\______/
 Phone: +49 711 685 2130        Pfaffenwaldring 31              |   |
 Fax  : +49 711 685 2010        7000 Stuttgart 80               \___/
From: spl@pitstop.ucsd.edu (Steve Lamont)
Newsgroups: comp.graphics
Subject: Re: looking for world bank
Keywords: cartography, world bank
Date: 3 Sep 92 19:47:22 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
NNTP-Posting-Host: pitstop.ucsd.edu

In article <1992Sep3.175830.24770@cs.ubc.ca> tessmann@cs.ubc.ca (Markus Tessmann) writes:
>>I am currently looking into 'computer assisted cartography' and I have
>>heard of a data base called 'world bank'.  Can anyone tell me where I
>>can get hold of it (If it is at all possible), and can anyone tell me
>>what exactly it contains and how to make use of it.
>
>>Any form of assistance will be greatly appreciated.  Thanks
>
>Me too.  Please post this info.

It's in the comp.graphics resource listing: 

...

d. CIA World Map II
[  NOTE: this database is quite out of date, and not topologically structured.
  If you need a standard for world cartographic data, wait for the
  Digital Chart of the World. This 1:1M database has been produced from
  the Defense Mapping Agency's ONCs and will be available, together with
  searching and viewing software, on a number of CD-ROMs later this summer. ]

  Check into HANAUMA.STANFORD.EDU and UCSD.EDU (see ftp list above)
  The CIA database consists of coastlines, rivers and political boundaries
  in the form of line strokes. Also on hanauma.stanford.edu is a 720x360
  array of elevation data, containing one ieee floating point number for
  every half degree longitude and latitude.
 
  A program for decoding the database, mfil, can be found on the machine
  pi1.arc.umn.edu (137.66.130.11).
  There's another program, which reads a compressed CIA Data Bank file and
  builds a PHIGS hierachical structure. It uses a PHIGS extension known as
  polyline sets for performance, but you can use regular polylines. Ask
  Joe Stewart <joes@lpi.liant.com>.
  The raw data at Stanford require the vplot package to be able to view it.
  (was posted in comp.sources.unix). To be more exact, you'll have to
  compile just the libvplot routines, not the whole package.

...

							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
Newsgroups: comp.graphics,comp.os.ms-windows.misc,comp.sys.ibm.pc.hardware
From: feustel@netcom.com (David Feustel)
Subject: Re: Addressing two independent monitors from one PC
Date: Wed, 26 Aug 92 00:43:31 GMT
Organization: DAFCO: OS/2 Software Support & Consulting
Keywords: Dual monitors, windows

elemjm@ccu1.aukuni.ac.nz (Michael Miles) writes:

>PROBLEM TIME...

>I need to use two SVGA monitors from the same computer. The problem is
>rather than simply displaying identical information, I want to be able to run
>Windows 3.1 on one, and send simple patterns to the other, controlled from a
>program running under Windows. I will be using either a standard or laptop 
>386 PC with coprocessor, 4Meg RAM.

>Question 1. Is this possible at all - even using a separate graphics card for
>            each monitor?

Yes.

>Question 2. Is there a special graphics card which will allow me to do this?

Several: Check with Colorgraphic Communication Corp (Atlanta, GA)
	and Digiboard. The CCC boards are cheaper.

>Question 3. I there any ready-written software to do this, and if so, where
>            from?

Both companies provide software with their boards.

-- 
Dave Feustel N9MYI <feustel@netcom.com>
 
( New .sig under construction. Watch this space! )
From: strat@matt.ksu.ksu.edu (Steve Davis)
Newsgroups: comp.graphics
Subject: Need Structured 2D formats w/ rendering engines.
Date: 25 Aug 1992 20:02:30 -0500
Organization: Kansas State University
NNTP-Posting-Host: matt.ksu.ksu.edu

Well I want to write a progam to convert between some of the
popular 2D structured drawing formats.  What I need is sample code!
I'd really want formal specifications and example rendering engines
if possible.  How many of these formats are available?  Where do I
find them on Internet?

Stratocaster

-- 
  Steve Davis  |    Contact me at ...            | The Boarding House BBS!
               | Internet:  strat@cis.ksu.edu    | 9600 baud (v.32/v.42)
               | FidoNet:    Steve @ 1:295/3     | America: 913-827-0744
The USA has more prisoners per capita than South Africa, Iraq, or CHINA!
Newsgroups: comp.graphics
From: trandu@woods.ulowell.edu
Subject: USA map in DXF format ?
Organization: University of Lowell
Date: Fri, 4 Sep 1992 04:01:52 GMT

hi,
is there an USA map in DXF format  anywhere on the network?
how about Massachusetts and California? thanx. huy.
Newsgroups: comp.graphics
From: goodrich@qdeck.com (Steve Goodrich)
Subject: Re: Tiff format description wanted
Organization: Quarterdeck Office Systems, Santa Monica CA
Date: Mon, 31 Aug 1992 13:55:15 GMT

In article <2479@corton.inria.fr> elias@corton.inria.fr (Banska Bystrica) writes:
>Hi!
>I am looking for TIFF format description. Can you 
>help me ? Thanks.
>Lubos Elias
>

A fine reference on several graphics formats is "Bit-Mapped Graphics" by
Steve Rimmer, published and copyrighted in 1990 by Windcrest Books (Windcrest
books is an imprint of TAB Books which is a division of McGraw-Hill, Inc.).

This book includes info on MacPaint, GEM/IMG, PCX, GIF, and TIFF formats, 
along with code to read (and write?) all of these.  

Rimmer's new book, "Supercharded Bitmapped Graphics" (same publisher info,
copyright is 1992) covers GIF, IFF/LBM, WPG (WordPerfect Graphics), BMP and
MSP (of Microsoft Windows fame), PIC, TGA (Targa), PCX, and TIFF formats.  
This book also includes file format descriptions (as did the first volume)
and code to manipulate the formats.

-- Steve G.
goodrich@qdeck.com
From: HCM100@psuvm.psu.edu
Newsgroups: comp.graphics
Subject: Graphics Formats
Date: 31 Aug 92 01:33:03 GMT
Organization: Penn State University

I'm looking for a comprehensive listing of all past and current formats
for graphics, including historical data, format, and limitations of
the format.  Also, what is the best image quality that each repsective
format is capable of?  Is there an FAQ for this group that would have that?
If so, my sight doesn't seem to have it currently available.  Any help would
be well appreciated (it's a karma thing)  ;-)
| HANS C. MASING                   | A BAD ATTITUDE IS THE      |
| HCM100 @ PSUVM.PSU.EDU           | DIFFERENCE BETWEEN THE     |
| MANAGEMENT INFORMATION SYSTEMS   | WAY I THINK AND THE WAY    |
| PENN STATE UNIVERSITY            | YOU THINK I SHOULD THINK.  |
From: johnl@iecc.cambridge.ma.us (John R. Levine)
Newsgroups: comp.graphics
Subject: Re: Tiff format description wanted
Date: 2 Sep 92 04:44:34 GMT
Organization: I.E.C.C.

>>I am looking for TIFF format description.

>A fine reference on several graphics formats is "Bit-Mapped Graphics" by
>Steve Rimmer, published and copyrighted in 1990 by Windcrest Books (Windcrest
>books is an imprint of TAB Books which is a division of McGraw-Hill, Inc.).

You might also be interested in Levine and Kay, "Graphics File Formats,"
published by Windcrest, ISBN 0-8306-3059-7 paper, -3060-0 hardcover.  It
covers TIFF format in more detail than Rimmer does, and many others.  I
think it's a swell book but since I wrote it I may be biased.

-- 
John R. Levine, IECC, POB 349, Cambridge MA 02238, +1 617 492 3869
johnl@iecc.cambridge.ma.us, {ima|spdcc|world}!iecc!johnl
Re-elect Vice President Potatoe-Head !
Xref: sparky comp.graphics:9200 comp.graphics.visualization:1257 comp.sys.ibm.pc.hardware:22795
From: bigmac@eng.umd.edu (Mike McDonald)
Newsgroups: comp.graphics,comp.graphics.visualization,comp.sys.ibm.pc.hardware
Subject: Looking for polygon engine hardware
Date: 27 Aug 92 14:02:02 GMT
Organization: University of Maryland, College Park, College of Engineering
Originator: bigmac@pepsi.eng.umd.edu

I am looking for a PC based graphics card for use as a VR graphics engine.
The card needs to be able to produce atleast 20K Gouraud-shaded,100 pixel
triangles/second. If anyone knows of any PC (ISA) card(s) like this, please
email some information on it.  I will later post a summary of the responses
I receive.

Thanks,
Mike

---------------------------------------------------------------------------
Mike McDonald                  
bigmac@eng.umd.edu               

"God not only plays dice, He sometimes throws the dice where they cannot be
 seen." - S. Hawking
Newsgroups: comp.graphics
From:  wrf@ecse.rpi.edu (Wm Randolph Franklin)
Subject: Re: SIGGRAPH member benefits
Organization: Rensselaer Polytechnic Institute, Troy, NY
Date: Mon, 31 Aug 1992 18:59:25 GMT


In article <17j0u4INNc7j@network.ucsd.edu> on 27 Aug 92 16:47:00 GMT,
spl@szechuan.uucp (Steve Lamont) writes:

  > I'm all for splitting SIGGRAPH off from ACM -- that way ACM could form
  > a new organization that would concentrate on the academic and research
  > aspects of computer graphics, as opposed to the show biz.  

Now now....  That's what I thought the visualization conference was
intended to do, and why I joked that it might be held separately to keep
people away.

Actually a decade ago the NCGA went head to head with SIGGRAPH and tried
to siphon off the industry types.  Even IBM considered dropping out of
SIGGRAPH one year, after they'd paid their deposit.  Anyone know what
the NCGA is doing today? :-)

There is a more theoretical conference, Symposium on Computational
Geometry.  However sometimes it seems to be a backup for papers rejected
by FOCS and STOC, (the 2 leading theoretical CS conferences); very good
papers, but quite theoretical.

In spite of (or because of?) the glitz SIGGRAPH does print good academic
and research papers.  I'm not saying this just because I've had three
papers in it.

The concept of organizations and conferences changing shouldn't be so
strange.  In GIS, for instance, conferences come, serve their purpose,
and then must defend themselves against the suggestion that they go.
There was serious consideration given to stopping the successful
research AUTOCARTO series after 10 irregular conferences because its
goals were perhaps being met in other ways (and because the ASPRS, its
larger host organization for conference scheduling, was so unaware of
Autocarto that they clean forgot to schedule its conference this time.)

My philosophy is that organizations serve the people, not the reverse.
If the org outlives its usefulness, then death!

-- 
Wm. Randolph Franklin,  wrf@ecse.rpi.edu, (518) 276-6077;  Fax: -6261
ECSE Dept., 6026 JEC, Rensselaer Polytechnic Inst, Troy NY, 12180 USA
Newsgroups: comp.graphics.explorer
From: rmaszkow@nyx.cs.du.edu (Rafal Maszkowski)
Subject: Another machines?
Organization: Nyx, Public Access Unix @ U. of Denver Math/CS dept.
Date: Fri, 28 Aug 92 21:18:23 GMT



Thank for the previous answer. I have next question:
There is an implementation of Explorer on SGI and Cray. Do you
(SGI people) plan to compile it on another machines. How much
would cost such program? I am interested in Convex and Sun - 
first for running modules, second for displaing. I afraid
that Suns are not good enough to display volumes. Am I right?

Rafal Maszkowski
From: robertl@cwi.nl (Robert van Liere)
Newsgroups: comp.graphics.explorer
Subject: Re: Volume rendering on a 4D35
Date: 28 Aug 92 08:05:55 GMT
Organization: CWI, Amsterdam


> I can't seem to get volume rendering to work correctly.  I've
> played with the splat sizes, adjusted the colormaps, prayed
> to the computer gods, but nothing works.  I've decided that
> I just don't have the hardware for it (low computer self image).
> 
> The problem is I get solid splats.  I can't seem to make them
> semi-opaque (sp?).
> 
> 
> I have a 4D35/TG and hinv gives me 
> 
> Graphics board: GR1.2 Bit-plane, Z-buffer, Turbo options installed
> 
> Do I need something else? or am I just an underachiever?
> 
> 
> Thanks for any help, or any recomendation of a good therapist that
> specilizes in computer caused mental disorders.

Gus,
	
The algorithm in VolumeToGeom uses alpha planes to make images
"semi-opaque". The rendering details of this algorithm can be
found in :

@article{DH91,
	author={D. Lear and P. Hanrahan},
	title={Hierarchical Splatting : A Progressive Refinement
		Algorithm for Volume Rendering},
	journal={Computer Graphics (SIGGRAPH '91 Proceedings)},
	volume={25},
	number={4},
	year={1991},
	pages={285-289}
}

If my memory serves me well, the TG does not have any alpha bitplanes.
Perhaps this should have been stated in the manual of VolumeToGeom or
cxGeoVolumeDefine.

All SGI models that support alpha planes should work. The base system
Indigo does it in software; others have alpha planes in hardware.
There is a neat program called 'ginv' which gives you a graphics inventory
of your machine.

-- Robert van Liere

PS.:  Why do you let these visualization packages drive you nuts ?
There are plenty of people on the net that are usually willing to
help. Just ask.
-- 
Robert van Liere, Department of Interactive Systems,
Center for Mathematics and Computer Science (CWI)
Kruislaan 413,  1098 SJ  Amsterdam,  The Netherlands
email: robertl@cwi.nl | tel: +31-20-592-4118 | fax: +31-20-592-4199