HDTenEightyP/NetNews huggingface dataset:
From: sloan@cis.uab.edu (Kenneth Sloan)
Subject: Re: Distributing Points on a Sphere
Organization: CIS, University of Alabama at Birmingham
Date: Fri, 10 Apr 1992 19:13:50 GMT

In article <PS.92Apr10081042@elan.princeton.edu> ps@elan.princeton.edu (Peter Schroeder) writes:
>...
>How about placing the desired number of points on the sphere in any old way
>you like and then running a relaxation. Define each point to have a
>repelling force about it and maintain the constraint of staying on the
>sphere.

This works quite well.  Note that you can greatly simplify the
computation by doing a two-phase perturbation of the points: first
perturb in (unconstrained) <x,y,z>.  Then, convert to (rho, colatitude,
longitude) and set rho to the radius of the sphere.  This turns out to
be easier than measuring distances and forces along the surface of the
sphere. 

> A few iterations of F=MA will give you ...

Actually, for this type of problem, F=MV is a better world to live
in.  F=MA gives all sorts of undesirable (for this problem) effects.
-- 
Kenneth Sloan                   Computer and Information Sciences
sloan@cis.uab.edu               University of Alabama at Birmingham
(205) 934-2213                  115A Campbell Hall, UAB Station 
(205) 934-5473 FAX              Birmingham, AL 35294-1170
From: cmp9116@sys.uea.ac.uk (A. Coats)
Newsgroups: comp.graphics
Subject: wanted: a digital map of any coastline
Date: 6 Apr 92 09:57:57 GMT
Organization: UEA, Norwich, UK

Hi,


can any body send me a digital map of any coastline for my final year
under grad project? I want to show the effectiveness of different algs's
on different types of coastline.

also any line simplification alg's (expect the Douglas-Peucker) written
in Pascal, Modula-2 or C would be beneficial.

thanks

Andy.
From: roger@serss0.fiu.edu (Regor)
Newsgroups: comp.graphics
Subject: Are there any emulators for the VT340 that run on an IBM comp.?
Date: 8 Apr 92 23:25:23 GMT
Article-I.D.: kluge.495
Distribution: usa
Organization: Florida International University, Miami


     I believe this is the correct news group for this...if it isn't, please
tell me which one I should post to.

     I am looking for an emulator for a DEC VT340 terminal which will run on
an IBM comp. computer. (can be 80286 and up).  If you have any information on
an emulator (preferrably PD), please send email.

				    Thank You.

				    Roger Hernandez
From: arys@pine.lle.rochester.edu (Alexander Ryskin)
Newsgroups: comp.graphics
Subject: info on microdensitometers and film recorders needed.
Date: 16 Apr 92 17:09:52 GMT
Reply-To: arys@lle.rochester.edu (Alex Ryskin)
Organization: UofR Laboratory for Laser Energetics

Hi, everybody!

I am looking for information on grayscale film recorders with at least
12"x12" recording area (30x30 cm^2), at least 256 levels of gray, and
with the smallest pixel size less than or equal 25 um.

Please reply to my email address. If there is sufficient interest, I'll
post the summary.

Thank you in advance,

arys@lle.rochester.edu <Alex Ryskin>
Laboratory for Laser Energetics
University of Rochester
(716)275-5333
Newsgroups: comp.graphics
From: stgprao@xing.unocal.com (Richard Ottolini)
Subject: Re: Pattern recognition vs Vision
Originator: stgprao@xing
Organization: Unocal Corporation, Anaheim, California
Date: Tue, 14 Apr 1992 14:57:16 GMT

In article <1992Apr14.102620.8364@csd.brispoly.ac.uk> ph_su@csd.brispoly.ac.uk (J.B. the Frog!) writes:
>Bonjour,
>
>There's a question which puzzle me a lot.
>Can anybody tell me the difference between Pattern recognition,
>Vision, Image understanding and a definition of each
>of the above.
>It seems for me that are very close to one another, and 
>that sometimes mean the same damn thing!

There is overlap, but some differences.
Pattern recognition means looking for meaningful structures in any domain,
not only visual.  This term is often applied to looking for statistical
correlations in hyperdimensional datasets.
Vision and Image Understanding are closer together in meaning, but can
be separated by the Subject-Object dichotomy.  Vision is concerned more
with how things are being seen, while Image Understanding is concerned with
interpreting what is being seen.  Vision is allied with pychology and robotics,
image understanding with photo-interpretation.
Newsgroups: comp.graphics
From: dgl@leland.Stanford.EDU (David Gary Lawrence)
Subject: Help: need graphics library for PC
Organization: DSG, Stanford University, CA 94305, USA
Date: Thu, 16 Apr 92 20:04:14 GMT

I'm looking for a library of graphics routines that can be called from C (or
pascal or fortran) for an IBM PC with VGA graphics.  Here's what it needs to
do:

-Plot ~ 100x100 colored squares with a color resolution of at least 50 (50
different color sqares on the screen at the same time).

-Draw lines and move them around the screen(preferably without updating the
rest of the screen).


This seems like a simple problem, but I've had a hard time finding something
that does it.  Borland C++ has a color "palette" size of 16, so I can only
display 16 colors simultaneously.  If anyone has any ideas, reply to me at
this account.  Thanks...

							dAVE


-- 
********************** 
Dave Lawrence
5D Escondido Village
Stanford, CA 94305
Newsgroups: comp.graphics
From: charliec@Everest.Tandem.COM (Charlie Comstock)
Subject: Re: Morphing
Organization: Tandem Computers Inc., Cupertino CA
Date: Tue, 14 Apr 1992 19:54:41 GMT

In article <92105.144420CTB103@psuvm.psu.edu>, CTB103@psuvm.psu.edu (Chad Burkins) writes:
>OPTIONS: NOACK    LOG    SHORT     NOTEBOOK ALL
>XOPTIONS: REPLYING to NETNEWS article
>
>
>>Can anyone provide me with a reference for the "morphing" technique
>>use in Michael Jackson's video "Black or White" and in "Terminator 2"?
>
>
>Not that it's really a reference, but there was a neato article about
>ILM (who did that morphing) in last week's TIME magazine.
>The mag that had the College Story on front.
>
>-Chad

Only partially right.  Pacific Data Images did the morphing in Michael
Jackson's video.  Effects of this type are available on the Amiga with
the program ImageMaster.

Charlie Comstock
From: gil@cse.ucsc.edu (Gil Fuchs   (408) 429-9224)
Newsgroups: comp.graphics
Subject: white noise
Keywords: white noise
Date: 13 Apr 92 04:49:07 GMT
Article-I.D.: darkstar.32746
Organization: University of California, Santa Cruz (CE/CIS Boards)

howdi net,

what is the formula (mu, sigma, and other fellars) for white noise?
why is it called white?  are there other colors (brown, pink, et al.)?

how does one compute signal to noise ratio?

thanks
-gil
Newsgroups: comp.graphics
From: werner@aero.org (Michael F. Werner)
Subject: SGI IRIX 4.0
Organization: The Aerospace Corporation, El Segundo, CA
Date: Thu, 9 Apr 1992 01:07:54 GMT

    What's the story with SGI's version 4.0 of IRIX?  I haven't installed it on
my system yet.  I heard today that there are major bugs with it and that another
version (4.1?) is being readied for release which will fix the bugs.  Has anyone
else found major bugs with 4.0?  Should I not even bother installing 4.0 and 
just wait for 4.1 to come out?
                                                         Thanks,   mfw
-- 

 Michael F. Werner           |   Performance Analysis Department
                             |   The Aerospace Corporation
 werner@aerospace.aero.org   |   El Segundo, California, USA  (near Los Angeles)
From: J.Heaton@MCC.ac.uk (John Heaton)
Newsgroups: comp.graphics
Subject: Re: info on ray-tracing warez
Date: 10 Apr 92 16:22:23 GMT
Organization: Manchester Computing Centre - Network Unit

In article <1992Apr7.192041.25744@math.ufl.edu> bang@maple.circa.ufl.edu writes:

>Well, this sure looks like the right place... hope y'all can help.

>The situation: having been fascinated by raytracing for a long time, I was
>very excited to get a copy of DKB Render, and was overly thrilled to find
>out that my 486/33 fairly flies thru all this numbercrunching.  However, we
>get jaded quickly, so I am now looking for a ray-tracer which will use my
>superVGA capabilities.

Why don't you just shell out some cash for an Edsun CEG DAC chip for your 
Tseng4000 VGA card.   I have the CEG chip on my system and use both 
DkbTrace and RV-Ray to produce 24bit targa files which with a bit of 
conversion can produce CEG images that would make the average Mega-Buck 
Workstation green with envy.  The Edsun CEG chip is pin compatible with the 
existing DAC chip on the VGA card, and cost me 25pounds.  To non-CEG 
graphics applications it is as if the chip is not there, but with the CEG 
display/conversion utilities, the effect is remarkable.

You can display about 780000 colors at once (about 19bits), and with the 
Continuous Edge antialiasing done in hardware, a 640*480 screen looks 
much better than 1024*768.
 

Cheers, John.
                  JANET : J.Heaton@uk.ac.Manchester
  Packet: G1YYH@G1YYH.GB7NWP.#16.GBR.EU                        (QTHR)
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
|                      NRS Central Administrator                      |
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|           Phone: (+44) 61 275 6011, FAX: (+44) 61 275 6040          |
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
Newsgroups: comp.graphics
From: twong@civil.ubc.ca (Thomas Wong)
Subject: Re: ATI 32k Color
Organization: Dept. of Civil Engineering, U.B.C., Vancouver, B.C., Canada
Date: Mon, 13 Apr 1992 16:54:57 GMT

In article <EDWONG.92Apr12154707@csa.bu.edu> edwong@csa.bu.edu writes:
>the nwe version of cshow supports 32k color.  but you have to find some
>.tga files to test it.  The gif doesn't support higher than 32k color
>format.

GIFs are limited to 256 colors in fact.
To see 32K color in cshow, read alt.binaries.pictures.misc newsgroup,
download the JPEG files, use djpeg with -T option to convert them to
Targa files, then view using cshow which recognize targa files.
I too have an ATI XL with 1Mb = 32K color and have been doing this
with the JPEG files. Compared to the GIF files (256 colors), there is
a big grainy difference! Remember to set cshow using the ATI driver
with the 32k mode though. Read drivers.doc.

Thomas.
From: ward@zoyd.ae.utexas.edu ((Steven) Ward)
Newsgroups: comp.graphics
Subject: surface attributes
Date: 31 Mar 92 14:20:26 GMT
Distribution: comp.graphics.visualization,comp.graphics
Organization: CFD Lab, Dept ASE-EM, University of Texas at Austin

After my initial request for an e-mail copy of the article listing
surface attributes (specular, diffusivity, etc) for various materials,
I have received only requests from others like me asking for a copy if
and when I get one. 

I haven't got one yet.  *PLEASE* , won't someone either re-post the
original article, or e-mail me and let me know you have one?!?

Steve Ward
ward@cfdlab.ae.utexas.edu
From: bolstad@ralph.rtpnc.epa.gov (Mark Bolstad)
Newsgroups: comp.graphics
Subject: Re: Distributing points on a sphere
Date: 10 Apr 92 12:01:54 GMT
Organization: U.S. EPA

In article <2995@cvbnetPrime.COM>, canderso@cvbnet.prime.com (Chris Anderson 4-1660 x??) writes:

>I have a need to distribute a set of n points (where n is generally >> 10)
>evenly over the surface of a unit sphere.  My present method generates 
>lattitude circles and divides the points among them in a simple-minded
>way, such that I nearly always end up with uneven spacing and/or an
>"incomplete" sphere.
>
>My desire is to have a set of coordinates for points on the sphere
>surface with equidistant spacing and full "coverage", regardless of
>the value of n.  Is this a problem that someone else has already
>solved in an elegant way?
>
>Thanks for any help.
>
>Regards,
>
>---Chris Anderson.


You may want to check out Greg Turk's paper from the SIGGRAPH '91 
proceedings, "Generating Textures on Arbitrary Surfaces Using Reaction-
Diffusion".  The second part of the paper describes a technique to 
"evenly distribute" points across a polyhedral model.  Once a set of points
has been randomly placed upon the surface, his algorithm uses 
relaxation/repulsion to create the distribution.

Mark Bolstad
Newsgroups: comp.graphics
From: thomas@sunshine.Kodak.COM (Thomas Kinsman)
Subject: SIGRAPH
Summary: Looking for contact point
Organization: Eastman Kodak Co., Rochester, NY
Date: Thu, 16 Apr 92 18:00:38 GMT

	--------------------------------------------------
	Would someone please post how to find out about
	SIGRAPH '92.  This conference should be coming up
	soon.  I am considering attending but don't have
	a contact point.

	Thank You. (Merci, Gracias,...)
	--------------------------------------------------
--
thomas@acadia.kodak.com    Voice: 716/477-2831(w)	     Fax: 716/722-0160
Thomas B. Kinsman, Eastman Kodak Co., Flr 3, Bldg 65, RL, Roch., NY 14650-1816
From: edwong@csa.bu.edu (Edward Wong)
Newsgroups: comp.graphics
Subject: Re: ATI 32k Color
Date: 12 Apr 92 19:47:07 GMT
Reply-To: edwong@csa.bu.edu
Organization: Boston University
In-reply-to: GJAMES@HUSKY1.STMARYS.CA's message of 8 Apr 92 14:53:51 GMT

the nwe version of cshow supports 32k color.  but you have to find some
.tga files to test it.  The gif doesn't support higher than 32k color
format.
--
8)
  _               _     | user's name:  Edward Wong
 |_ |\ \   / /\  |_) |\ | ARPA:     edwong@csa.bu.edu	
 |_ |/  \^/ /==\ | \ |/ | UUCP:     csa.bu.edu!edwong
From: turk@Apple.COM (Ken "Turk" Turkowski)
Newsgroups: comp.graphics
Subject: Re: integer math libraries
Date: 7 Apr 92 22:08:51 GMT
Organization: Advanced Technology Graphics, Apple Computer, Cupertino, CA, USA

quandt@mcs213c.cs.umr.edu (Brian Quandt) writes:
>I'm looking for integer math libraries for the C language.  What I mean
>are packages that do things like calculate the cosine of an angle via
>table lookup (or other means) all using integers, with the integers
>scaled to get the precision that is required.  The reason: for use in
>high speed graphic systems.  I'm interested in both public domain stuff
>and pay software.  Any suggestions?

Sure.  Look in graphics gems.  You'll find trigonometry and square roots.
-- 
Ken Turkowski @ Apple Computer, Inc., Cupertino, CA
Internet: turk@apple.com
Applelink: TURK
UUCP: sun!apple!turk
From: merlin@neuro.usc.edu (merlin)
Newsgroups: comp.graphics
Subject: WANTED: film recorder recommendations for new image analysis center
Date: 10 Apr 1992 18:35:24 -0700
Organization: University of Southern California, Los Angeles, CA
NNTP-Posting-Host: neuro.usc.edu

I would appreciate receiving any pointers, recommendations, or personal
experiences with film recorders for image recording.  I would like to
to acquire a 4096 x 4096 x 24 bit true color system.  However, budgetary 
limitations may cut us back to something like 1024 x 1024 x 8 bit color.  
We will record primarily on 135-24 or 135-36 Ektachrome Professional 100
color slide film.  We would also like to be able to produce Polaroids.

This is an important purchase for our center -- please send any comments
which you think may be helpfull to us.

Thanks, AJ Annala

Principal Investigator
Neuroscience Image Analysis Network
HEDCO Neuroscience Building, Fifth Floor
University of Southern California
University Park
Los Angeles, CA  90089-2520
From: hollasch@kpc.com (Steve Hollasch)
Newsgroups: comp.graphics
Subject: Re: need Texture algorithms
Summary: Ok, here's a few...
Date: 9 Apr 92 23:25:17 GMT
Article-I.D.: kpc.1992Apr9.232517.8762
Organization: Kubota Pacific Computer, Inc.

hamid@imada.ou.dk (Hamid Sarabi) writes:
| I need an algorithm for texture mapping. In particular I need 2-dimensional
| domain techniques, (mapping onto polygon mesh models).  You can also lead
| me to a library (shareware).
|
|                                Thanking you in anticipation

    There are a variety of sources for texture mapping; here's a few
references from my shelf:

        Computer Graphics  Principles and Practice, Foley, van Dam,
        Feiner, Hughes, 2nd edition.  See "Surface Detail".

        Graphics Gems, edited by Andrew Glassner.  See "Texture map
        indices, interpretation".

        Procedural Elements for Computer Graphics, David Rogers, See
        "texture".

        Mathematical Elements for Computer Graphics, 2nd Edition, David
        Rogers & J. Adams, see "Surface mapping".

    
________________________________________________________________________
Steve Hollasch                             Kubota Pacific Computer, Inc.
hollasch@kpc.com                           Santa Clara, California
Newsgroups: comp.graphics
From: saltz@odin.unomaha.edu (Gordan Saltz)
Subject: .FLI Ftp site?
Summary: Looking for ftp site for .FLI
Keywords: fli
Organization: University of Nebraska at Omaha
Date: Tue, 14 Apr 1992 01:48:46 GMT

Hello,

Could someone send me a list of anonymous ftp sites that have .FLI file.

Thanx in advance.
Gordon
saltz@odin.unomaha.edu
.
From: gt0677b@prism.gatech.EDU (Todd E. Ham)
Newsgroups: comp.graphics
Subject: Re: Morphing
Date: 15 Apr 92 23:32:11 GMT
Organization: Ramblin' Wrecks from Georgia Tech

In article <1992Apr14.180239.581@news.cs.indiana.edu> menzel@iuvax.cs.indiana.edu (Suzanne Menzel) writes:
>
>Can anyone provide me with a reference for the "morphing" technique
>use in Michael Jackson's video "Black or White" and in "Terminator 2"?

	Perhaps you will find the January 1992 issue of Computer Graphics
World helpful.  There is an article in it which discusses morphing with
references to the Michael Jackson video, T2, Willow, Indiana Jones and the
Last Crusade, and a few others.

-Todd
-- 
Todd E. Ham - CS '93 Georgia Inst. of Tech. - gt0677b@prism.gatech.edu
----------------------------------------------------------------------
     What this country needs is more unemployed politicians.
                         -Edward Langley
From: kaustell@viikki.Helsinki.FI (KIM OLAVI KAUSTELL (MATEK))
Newsgroups: comp.graphics
Subject: Graphics formats & Picture Publisher
Keywords: Graphic formats
Date: 10 Apr 92 12:11:24 GMT
Organization: University of Helsinki, Fac.Agric.For.

Q1:
I've seen a description on graphics formats (RLE, Targa, GIF, TIFF, etc), 
but can't remember where. So I would appreciate any hints on this subject.

Q2:
What is the difference between Picture Publisher v. 2.5A and 3.0 LE ?
I guess LE stands for limited edition, but is there a retail version 3.0 ?

With regards

Kim Kaustell
University of Helsinki
Dept. of Agric. Engineering and Household Technology
E-mail: KAUSTELL@Viikki.Helsinki.Fi
From: rodgers@Stars.Reston.Unisys.COM (G. Mike Rodgers)
Newsgroups: comp.graphics
Subject: NITF
Date: 13 Apr 92 16:05:44 GMT
Reply-To: rodgers@aviary.UUCP (G. Mike Rodgers)
Distribution: usa
Organization: Paramax

I am looking for a source of info on the NITF image format...?
Anything will make me happy... {:)

gmike rodgers
Paramax            rodgers@stars.reston.unisys.com

-- 
gmike rodgers - sregdor ekimg
Paramax Systems Corporation (A Unisys Company)
12010 Sunrise Valley Drive                  (703) 620-7421
Reston, VA 22091                            (703) 620-7813 FAX
Newsgroups: comp.graphics
From: stgprao@xing.unocal.com (Richard Ottolini)
Subject: Re: white noise
Originator: stgprao@xing
Organization: Unocal Corporation, Anaheim, California
Date: Thu, 16 Apr 1992 18:09:27 GMT

In article <1992Apr16.134646.15220@pencom.com> eric@pencom.com writes:
>I have heard of brown noise.  It is the sort of noise you want
>when generating, say, fractal mountains.

Brown noise is named after Brownian motion, in turn named after a scientist
called Brown who first claimed to observe it.  (The claim is in dispute,
because there weren't powerful enough instruments in the 19th century.)

However, brown noise can be described in the context of other colored noise.
A quick summary:
white: uniform, no frequency bias
colored: non-uniform, a frequency bias
red, pink, infra-red: bias toward low frequencies, output of integration operator
blue, violet, ultra-violet: bias toward high frequencies, output of differentiation operator
brown: fractal, obeys a power-law, which is simply a frequency ramp
monochrome: narrow frequency band
From: kdarling@garfield.catt.ncsu.edu (Kevin Darling)
Newsgroups: comp.graphics
Subject: Re: Photo CD
Date: 16 Apr 92 20:39:20 GMT
Organization: North Carolina State University

Pete Cockerell writes:
> About a year ago I posted asking if anyone had details on Kodak's Photo
> CD system. I got about two 'me too' replies, and that was it!  Well,

comp.multimedia, alt.cd-rom, rec.photo discuss Photo CD fairly often.

> it's supposed to be launched this Summer, so how about it? Anyone know
> what its capabilities are, how much of the colour and spatial resolution
> you lose from a 35mm neg, what the players can do (zoom/pan etc etc)?

The highlights are easy enough:  a photofinisher with the Kodak Photo CD
Imaging Workstation (PIW) will be able to scan 35mm slides or negatives
(and later, 4x6" prints) and write them onto a Photo CD disc.  The first
24 frames will cost ~$20; up to 100 total can be added to the disc later.
The images can also be copied to new discs, and prints can be made.

The resolutions at which the image can be accessed are: 128x192 pixels,
256x384 pixels, 512 x 768 pixels ("base" or "TV" resolution), 1024x1536
pixels (HDTV resolution), and 2048 x 3072 pixels.

Home viewing will usually be done on Photo CD players (due mid-1992, MSRPs
of $400-600), or on CD-I players (out now).  Zoom/pan/etc depends on player.
There will also be software for computer CDROM-XA users to view the images.

Sometime in 1993, "enhanced Photo CD" will be available... which adds
interactive audio, text and graphics capabilities.  The idea is to allow
creating low-volume discs (example: local real estate sales presentations).

I believe you can call Kodak at (800) 242-2424 for more Photo CD specs.

regards - kevin <kdarling@catt.ncsu.edu> <76703.4227@compuserve.com>
Newsgroups: comp.graphics,sci.math,comp.os.msdos.programmer,comp.lang.c
From: jpenne@ee.ualberta.ca (Jerry Penner)
Subject: Bruce Artwick's book (Re: Fixed point arithmetic)
Organization: University Of Alberta, Edmonton Canada
Date: Fri, 17 Apr 1992 00:21:34 GMT

checker@acf3.nyu.edu (Christopher Hecker) writes:

>Although I can't remember the name of the book, and I've never seen it
>myself, I have heard that there is a book by Bruce Artwicks that talks
>about fixedpoint arithmetic and 3D graphics.

Applied Concepts in Microcomputer Graphics (this is from memory).
This book was originally published under another title but I can't
remember that.

>As far as code goes, you could look for Michael Abrash's X-Sharp .zip.
>It is done with fixedpoint.  The past 4 or so DDJs have focused on it.
-- 
Jerry Penner   jpenne@ee.ualberta.ca
From: pavlin@gw.syr.ge.com
Newsgroups: comp.graphics
Subject: Algorithms for plotting networks?
Date: 13 Apr 92 17:10:38 GMT
Article-I.D.: gw.1992Apr13.121039.431
Organization: General Electric Co., Syracuse, NY

Greetings.

I was wondering: does anybody know of a good reference for algorithms on
plotting connected networks/directed graphs/whatever else they were called
in my grad school days, i.e. how to twist an arbitrary network around to
make it lie flat on a sheet of paper. 

The reason I need this is that I would like to plot a picture of the
REAL state of my company's TCP/IP network (as opposed to what other people
CLAIM is the structure of the net). I can get the connection information
(I have a little C program called gatewalk which uses SNMP and RIP to 
interrogate routers for their adjacent nodes), but do not presently have a 
way to format the resulting data for display in an easily understood format.
A source of any suitable algorithm would be much appreciated (my site has
many PostScript printers, so something that just generated a PostScript
program as output would be fabulous).

Please send e-mail if possible, although I will be reading this group more
often now anyway. Thanks in advance.

Andrew Pavlin, TCP/IP network administrator
General Electric Co., Aerospace Information Technology
Syracuse, NY 13221
email: pavlin@syr.ge.com
Newsgroups: comp.graphics