HDTenEightyP/NetNews huggingface dataset:
From: akin@sgi.com (Allen Akin)
Subject: Re: Graphing ranges question (2D)...
Organization: Silicon Graphics, Inc.
Date: Tue, 8 Sep 1992 17:38:12 GMT

In article <92251.142224IFF291@DJUKFA11.BITNET> IFF291@DJUKFA11.BITNET (Stephan Petersen) writes:
| 
| Is there a routine which, as universal as possible (that is without
| considering *too* many special cases), determines for a given
| minimum/maximum pair of values plotting ranges *that make sense* ?

Check out Paul Heckbert's "Nice Numbers for Graph Labels" starting on
page 61 of Graphics Gems.

Allen
Organization: Queen's University at Kingston
Date: Saturday, 12 Sep 1992 22:02:12 EDT
From: <JIANGY@QUCDN.QueensU.CA>
Newsgroups: comp.graphics
Subject: Re: Polygon Decomposition & Delaunay Triangulation
 <92254.213045JIANGY@QUCDN.QueensU.CA> <18qap0INNp8c@network.ucsd.edu>

Thanks !
Newsgroups: comp.graphics
From: u8023504@cc.nctu.edu.tw ()
Subject: How to enter the Caltech's public domain??? 
Organization: National Chiao Tung University
X-Newsreader: Tin 1.1 PL4
Date: Mon, 7 Sep 1992 13:12:43 GMT

Could anybody tell me the IP adress of Caltech's public domain ?
Please email to u8023504@cc.nctu.edu.tw
Thanks in advance.

			Jen-Duo Liu  92/9/7



Newsgroups: comp.graphics,comp.sys.amiga.graphics
From: ESRLPDI@MVS.OAC.UCLA.EDU (Ivan Ivanick)
Subject: Re: Info wanted about Hash Enterprises: Will WIntons Playmation
Date: 11 Sep 92 23:53:03 PDT

In article <DgPyqB1w165w@micromed.com>, on 12 Sep 92 00:20:12 GMT,
diskount@micromed.com (don hirschfeld) writes:
>
>From the ads, Playmation for the PC lokks like a port from Journeyman
>(they show the same sample files). I hope the PC version renders to a
>higher resolution than the sample files I saw on the Amiga.
>
>--
>diskount@micromed.com (don hirschfeld)
>
Playmation is indeed Journeyman, retitled to take advantage of Will
Vinton's name & his process of "claymation".
My understanding was that the IBM version only supported 320x200
renders (blazingly fast, though, for Journeyman), but the Amiga version
can handle well above that.  A theoretical limit of 32000x32000, if I
recall correctly.  I certainly have rendered at 768x482, so I think you
must have seen some junky files.  The Amiga version is out, apparently,
for an upgrade fee of $100 ($350 for first time buyers?).  I'll hopefull
be getting it early next week.
Ivan I
Newsgroups: comp.graphics
From: mcastle@mcs213d.cs.umr.edu (Michael R Castle)
Subject: Re: Flic-files - HOW ??
Date: Thu, 10 Sep 1992 16:27:47 GMT
Organization: University of Missouri - Rolla
Keywords: flic files, pc

In article <03249587.716112759@mama> 03249587@mama.minmet.uq.oz (Darcy Clark) writes:
>  Can some kind soul tell me if there exists a way to convert scanned images on the PC (TIF format??) into nice little animations. Are there programs which      can assemble frames into a flic-file, or will I have to write my own routines?   I've seen a p

There is a library on simtel20 and mirrors that lets you create, manipulate,
and play file-files.  You just have to write your own program based on these
libs, but they might be useful.

Look in the pd1:<msdos.graphics> directory.  Forgot the name of the package,
flilib*.zip I believe.  Look around.  There is also a program that does targa
to flics.  I have also written a ppmtofli program if any ones interested (it's
hidden in my archive of floppies, however, and may take up to a week to find if
anyone is interested).  

All of these packages, I beleive, only do 320x200 size images.  Does anyone have
docs on the file descriptions for the newer flic files??  I'd like to bring my
ppmtofli and flitoppm programs up to date and distribute, but I need a file
description.  Any help here would be appreciated.

regards,
mrc
>rogram called "GRASP", will something like this work??                           thanks, and any feedback will be appreciated!                                     DARCY CLARK : 03249587@MINMET.UQ.OZ.AU
>
Newsgroups: comp.graphics
Subject: Weiler-Atherton polygon clipper
From: jwil1@cs.aukuni.ac.nz (TMOTA)
Date: Tue, 8 Sep 1992 04:11:00 GMT
Organization: Computer Science Dept. University of Auckland

I'm looking for some source code for a Weiler-Atherton polygon clipper.

Now, before you all flame me with the immortal question "When is the
assignment due?", I will point out that I need this code to evaluate
the performance of my own visible-surface algorithms against a real-
world, "industry-standard" algorithm such as W/A, for my Master of
Science thesis.

I am perfectly willing to implement a W/A clipper for myself, but both
I and my supervisor feel that the time would be better spent on more
important things - the algorithms that I am developing...

So if anyone knows where I can get my hands on such source code
(preferably in C; email && ftp are fine) I would be very grateful.

Thanks in advance,
Jason Williams.
-- 
_________________  "I'd like to answer this question in two ways:
  /____ _ _/_ __       First in my normal voice, and then
 // / //_//_ /_/       in a silly, high-pitched whine." (Monty Python)
Newsgroups: comp.graphics,sci.image.processing
From: sjreeves@eng.auburn.edu (Stan Reeves)
Subject: Re: Reconstructing "Screened" Photos
Organization: Auburn University Engineering
Date: Mon, 14 Sep 1992 15:09:18 GMT

In article <1992Sep10.214544.15663@sctc.com> boebert@sctc.com (Earl Boebert) writes:
>Assume you had a series of photographs that had been printed using
>letterpress technology some fifty years ago. This means that they
>would have been "screened" into dots of some size like 1/100 of an
>inch.  Further assume that you wanted to scan them into a computer and
>applying appropriate image enhancement software to "unscreen" the
>dots for modern reproduction.  If your machine was a 486 clone, what
>scanner and software would you use?

More generally, what algorithm could be used?  The following reference is
the only relevant one I've seen:

@Conference{analoui92,
  author =  "M. Analoui and J. Allebach",
  title =   "New Results on Reconstruction of Continuous-Tone from Halftone",
  booktitle =   "1992 International Conference on Acoustics, Speech, and Signal 
Processing",
  pages =   "313-316"}

Anybody seen any others?  Earl, I'd like to know of any info you get via
email.



--
Stan Reeves
Auburn University, Department of Electrical Engineering, Auburn, AL  36849
INTERNET: sjreeves@eng.auburn.edu
Newsgroups: comp.graphics
From: 03249587@mama.minmet.uq.oz (Darcy Clark)
Subject: Flic-files - HOW ??
Summary: how create flic files??
Keywords: flic files, pc
Organization: Prentice Centre, University of Queensland
Date: Thu, 10 Sep 1992 08:12:39 GMT

  Can some kind soul tell me if there exists a way to convert scanned images on the PC (TIF format??) into nice little animations. Are there programs which      can assemble frames into a flic-file, or will I have to write my own routines?   I've seen a program called "GRASP", will something like this work??                           thanks, and any feedback will be appreciated!                                     DARCY CLARK : 03249587@MINMET.UQ.OZ.AU

From: danv@hpsad.sad.hp.com (Dan Van Winkle)
Date: Thu, 10 Sep 1992 20:00:06 GMT
Subject: I'm looking for USGS digital elevation models.
Organization: HP Signal Analysis Division - Rohnert Park, CA
Newsgroups: comp.graphics

I'm looking for USGS Digital Elevation Models.  I have found one can use these
data bases to create very nice renderings.  The USGS will only distribute
on tapes that don't seem to fit into my disk drive....and they charge too 
much. 

If this is the wrong notes group does anyone know of a better group to ask?

Thanks in advance,

Dan
Newsgroups: comp.graphics
From: XT.JGC@forsythe.stanford.edu (John Claudy)
Subject: Help: PC/Mac video to NTSC signal converters
Organization: Stanford University, California, USA
Date: Thu, 10 Sep 1992 18:09:36 GMT

I am seeking the names, addresses and phone/FAX numbers
of companies that produce PC and/or Mac video to NTSC signal
converters.  I want to be able to use a VCR to record what
is being displayed on a computer monitor.  At a minimum I
would like to be able to convert from Macintosh to NTSC
and from Super VGA to NTSC.  Yes, I realize this will
likely require different converter boards/devices for the
two input formats.  Thanks for any help you can give me,
and I would appreciate you posting directly to me rather
than to the board.  Feedback on any experience you have
with any of these products would also be appreciated.
Thanks.
John Claudy
Newsgroups: comp.graphics
Organization: Queen's University at Kingston
Date: Saturday, 12 Sep 1992 22:09:50 EDT
From: <JIANGY@QUCDN.QueensU.CA>
Newsgroups: comp.graphics
Subject: Looking for DXFIN source...

Hi, everybody:

I amd looking for a program to read DXF file produced by AUTOCAD
The program should extract, at least, polygons, polylines and text
from such a file. Any pointers are welcome.

Thanks a lot!


Yaohong Jiang
Queen's U
Kingston, Ont.
From: g.coulter@uk.ac.daresbury (G. Coulter)
Newsgroups: comp.graphics
Subject: XY - XYZ Projection in C
Date: 7 Sep 92 15:09:31 GMT
Reply-To: g.coulter@uk.ac.daresbury
Organization: Daresbury Laboratory, UK

I hope that this is the correct place to place this request.
I am a third year student interested in computer graphics.
My main interest is getting started in 3D graphics. Can anyone
provide me with a simple projection algorithm (with fixed or
adjustable perspective) with which I can convert from (XYZ)
3D coordinates to (XY) screen coordinates. With the result
of giving the effect of a third dimension (Z) on a 2D plane
ie the screen.

Thanks in advance for any help.............................

Gary Coulter SERC Daresbury Laboratory.

Reply .. g.coulter@uk.ac.daresbury
Newsgroups: comp.graphics
From: dmatiske@bernstein.helios.nd.edu (david matiskella)
Subject: Re: Fast 3d bitmap polygons ?
Reply-To: dmatiske@bernstein.helios.nd.edu (david matiskella)
Organization: Univ. of Notre Dame
Date: Wed, 9 Sep 1992 21:38:18 GMT

	If you get one of the wolf editors you will see that they are just bitmaps. And a lot of them. Most of the objects have only one view. To see this try walking around a body. Notice which way the feet always point. The have pictures for the Guards at what look to be about 45 degree angles.
From: aktihan@trbilun.bitnet (Murat Aktihanoglu)
Newsgroups: comp.graphics
Subject: Silicon Graphics policy for UNIVERSITIES ??
Keywords: computer graphics hardware, software.
Date: 7 Sep 92 13:16:35 GMT
Organization: University of Bilkent-Computer Center  ANKARA/TURKEY

We, ( BILKENT UNIVERSITY, ANKARA, TURKEY ) have

  Silicon Graphics POWER+

and we are looking for FREE or discounted

  Animation, Rendering and Image Processing Tools Software.

Does Silicon Graphics have a special policy for non-profit
organizations like universities ?

Or, are there any ftp sites with such software ??

Thanx,
-----------------------------------------------------------
Murat Aktihanoglu (Research Assistant, Comp.Eng.Dept.)

email : aktihan@trbilun.bitnet

-----------------------------------------------------------



Newsgroups: comp.graphics,comp.lang.postscript
From: mic@lcsstr.stgt.sub.org (Michael Lederer)
Subject: Re: postscript separations
Organization: LCS - 7303 Neuhausen / Germany
Date: Fri, 11 Sep 1992 07:00:56 GMT

In article <1992Sep10.012128.16339@mintaka.lcs.mit.edu> 
lewin@brokaw.lcs.mit.edu (Jonathan Lewin) writes:
>
>...properly when printed). Is there any way within Designer to generate
>postscript files for 4-color separations that will allow bit maps to print
>properly, or is there any other program that could take Designer postscript
>output and manipulate it to generate effective separations?

I got a data-sheet about a DOS-Windows-Prgm. called Separator 4.0 in
Germany, the name in USA is Publisher's Prism from InSight Systems Inc.
The program seperates postscript-files in four files for cyan,yellow,
magenta and black. 
It's told that Ziff-Davis uses it for producing the PC Magazine.
If you need more information, I could send you the English data-sheet
per telefax.

Mic
-- 
Michael Lederer          Voice: (49)-7158-60033       D-7303 Neuhausen
mic@lcsstr.stgt.sub.org  FAX:   (49)-7158-60034       Germany
From: spl@pitstop.ucsd.edu (Steve Lamont)
Newsgroups: comp.graphics
Subject: Re: .ik files? What are these?
Date: 10 Sep 1992 15:06:59 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
NNTP-Posting-Host: pitstop.ucsd.edu

In article <p8@byu.edu> gaow@bones.et.byu.edu (Jinsong Gao) writes:
>By the way, could any one tell me which company is the publisher of Graphics
>Gems series?  

Academic Press
1250 6th Ave
San Diego, California.
(619) 231-0926

							spl

					
-- 
Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@dim.ucsd.edu
UCSD Microscopy and Imaging Resource/UCSD Med School/La Jolla, CA 92093-0608
"There was a time when tyrants feared/The new world of the free.
Now freedom is afraid and shrieks/At tyranny." - "Brave New World," A. Macleish
Newsgroups: comp.graphics
From: atzeiner@iastate.edu (your mom)
Subject: Re: 24 bit images
Organization: Iowa State University, Ames, IA
Date: Tue, 15 Sep 1992 03:50:08 GMT

In article <38053@sdcc12.ucsd.edu> rounsley@jeeves.ucsd.edu (Steve Rounsley) writes:
>Sorry folks if you've heard this before, but something screwy
>happened with my mail program and I have lost all those replies
>you sent me. If the guy who sent me info on his ray traced
>images reads this, please could you send me the address again.
>Thanks again ....
>
>	for those who didn't read my earlier message...
>I was inquiring about a source for 24 bit color graphic image
>files.  I want to see what my new video card can do.
>
>	Steve
>


Could you post a summary when you re-receive any info...


Newsgroups: comp.graphics
From: nuffy@intelhf.hf.intel.com (John Hagler)
Subject: PCX Viewer FOR HP95 PALMTOP
Keywords: PLEASE HURRY
Organization: Development Tools Operation, Intel Corp., Hillsboro  OR
Date: Thu, 10 Sep 92 18:21:02 GMT


I really need a PCX file viewer that will work on the HP95 Palmtop computer
Anyone know of an FTP sight where I can get one?
Please post and Email.
Thanks.
nuffy@hfglobe.intel.com
From: erich@eye.com (Eric Haines)
Newsgroups: comp.graphics
Subject: Re: 3d line through 3d polygon
Date: Mon, 14 Sep 92 13:46:43 GMT
Organization: 3D/EYE, Inc.  Ithaca, NY

In article <92256.221654JIANGY@QUCDN.QueensU.CA> <JIANGY@QUCDN.QueensU.CA>
write
s:
>The most intuitive (not necessarily efficient) solution is:
>   (1) compute the coefficient (A, B, C, D) of the polygon plane
>       using Newell (?) method.
>       ...

Your method's normally the most efficient overall, too (though you could do
extra things like putting the polygon in a bounding box and using the box for
tests, if the polygon was sufficiently complicated).


>(Sorry, I missed one step between steps 2 and 3: you have to rotate
>the polygon and the intersection point so that all the polygon vertices
>and the intersection point have the same z coordinates, since the point-in-
>polygon test in RTNews works only for 2D point and polygons.

You don't need to rotate:  just throw away one of the coordinates of the
triplet (this is equivalent to casting the polygon onto one of the XY, YZ, or
XZ planes).  The best coordinate to throw out is the one with the maximum
absolute value for the normal components of the plane.  For example, if the
plane's normal was (-1,-5,2), throw away the Y component (i.e. use the XZ
plane for casting).  This ensures that you don't cast the polygon onto a plane
perpendicular to its normal, which turns the polygon into a no-area beastie.

Eric Haines
Newsgroups: comp.graphics
From: kelly@michaelangelo.vis.citri.EDU.AU (Andrew David KELLY)
Subject: Tseng 24-bit registers info required
Summary: tseng lab, 24-bit, register info required
Keywords: tseng lab, 24-bit, registers
Organization: Computer Science, University of Melbourne, Australia
Date: Mon, 7 Sep 1992 04:41:39 GMT

I require information on the Mega Eva/2 tseng ET4000 card.

In particular I want to know the following:

	How to put the card in 24-bit mode.

	How to turn of the raster so that the screen becomes blank, without
	needing to fill the video memory with zeros (or blank out colour
	map)

	Is it possible to fit 2 640x400 256 colour images in video memory at
	once, where the 256 colours are chosen from the 16.7 million
	available colours.

	At the moment I am displaying images with a maximum of 64 greys,
	for our experiments this causes too much banding.  I want to
	remove this banding by using 24-bit colour information, and if
	possible I want to still be able to keep two images in video
	memory at one time.

	Also I would like to know how to set the colour map.  At the moment
	I can do this, and deliberately convert all the RGB values from
	values of 0 to 255 into values in the range of 0 to 63.  I have just
	purchased a 24-bit card, and would like to know if to get the extra
	colours if I simply don't rescale the colour map and switch the card
	into a 24-bit mode, or whether it is more complicated than this.

	Any routines in C would be nice, but assembler is Ok.

	Thanks for any help.

		Andrew Kelly

		    login: kelly@krang.vis.citri.edu.au.
From: jmt7@ns1.cc.lehigh.edu (JOHN M. TROIANO)
Newsgroups: comp.graphics
Subject: Silicon Graphics "Indigo" array processors?
Date: 9 Sep 92 12:49:37 GMT
Organization: Lehigh University


    Does anyone know of any array processor boards which are compatible
with the Silicon Graphics Indigo machine? I need to do (for example)
2-d fft computations and it would be most efficient to do this in
hardware which was designed for this purpose.

                                    Thanks, John M. Troiano

                                    
Newsgroups: comp.graphics
From: lee.weller@anat.utas.edu.au (W. L. Weller)
Subject: 3D reconstruction for histology
Organization: University of Tasmania, AUSTRALIA
Date: Tue, 8 Sep 1992 02:34:11 GMT

I'm looking for information on Mac/DOS software for making 3D reconstructions
from serial histological sections.  I'd like to know:
     1.  the name
     2.  its source or contact
     3.  its availability
     4.  the platform it runs on
     5.  any criticisms or backpats (both firsthand and hearsay)
     6.  whether it's free, share or commercial

All pointers and suggestions accepted gratefully!

Lee Weller
Department of Anatomy, University of Tasmania
(lee.weller@anat.utas.edu.au)

                 *Yes, Virginia, there is a Tasmanian devil*


Newsgroups: comp.graphics
From: leo@zelator.in-berlin.de (Stefan Hartmann)
Subject: Re: Speedstar 24x and other such cards
Organization: Puplic-Access-Xenix-System
Date: Mon, 07 Sep 92 23:44:59 GMT

In <1992Sep1.200007.18951@organpipe.uug.arizona.edu> newberry@newton.as.arizona.edu (Mike Newberry) writes:


>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

Hi,

here ia one:

Genoa 7900 Multimedia SVGA, 24 bits at 640x480, very fast and running
win3.1 drivers, OS2 drivers ! Yes they work !, DRAM, 0-wait state
design,
1024x768 at 72 Hz with 256 colors, 1280x1024x16 with Interlace max.
resolution.

OS2 drivers with 1024x768x256 max resolution.

PC2TV (Pal) converter for its 24 bits mode available for around 200
US$. (NTSC coming soon)
So record your 640x480x24 bit pics to VCR. Use VPIC5.0 to do a
TGA true color slide show or use PhotoStyler under win3.1 to edit
24 bit pics. It is just great !

Best regards Stefan Hartmann.
email to: leo@zelator.in-berlin.de


-- 
 
*************************************************************
*  Stefan Hartmann       This is how to contact me:         *
*  EMAIL: leo@zelator.in-berlin.de                          *
*  Phone : ++ 49 30 344 23 66      FAX : ++ 49 30 344 92 79 *
*************************************************************
Newsgroups: comp.graphics
From: allane@earth.gas.unsw.OZ.AU.gas.unsw.OZ.AU (Allan Evans)
Subject: Re: Is there a mathematical relationship RGB -> wavelength?
Summary: Colour vision with two primaries
Organization: University of New South Wales
Date: Wed, 9 Sep 1992 03:46:45 GMT

schuette@wl.com (Wade Schuette) writes:
> ab@nova.cc.purdue.edu (Allen B) writes:
> > stgprao@xing.unocal.com (Richard Ottolini) writes: 
> >> The psychology of color perception is much more complicated than the response
> >> of the four kinds of retina cells.  The late Edwin Land of Polaroid was
> >> fond of showing images composed of two color primaries that appeared to have
> >> all the colors in it.
> >
> >I have heard about this through unreliable channels, but
> >my understanding is that he used two (black and white)
> >slide projectors.  One had a red filter on it.  Is that true? 
> 
> I believe there was a Scientific American article about this a decade or
> so ago.  My recollection was that he claimed he could do this trick with
> almost ANY two colors, and, to prove it, did it once using the sodium
> doublet at 5889 and 5891 angstroms, one for each projector.  The projected
> image was a picnic, and observers could see the red and white checked 
> tablecloth, the blue sky, green grass, orange oranges, etc. 

If anyone knows any more about this, please post the info or email me at
allane@earth.gas.unsw.oz.au (watch my header on this message...it is 
probably corrupted). Every know and then an interesting article on colour
and vision pops up, but I have yet to find a thorough list or summary
of what is known about it. 

Al
_______________________________________________________________________________
| Allan H. Evans * School of Geography * UNSW * PO Box 1 Kensington 2033 Aust.|
| allane@earth.gas.unsw.OZ.AU  Remote Sensing and Spatial Information Systems |
From: sl8nl@cc.usu.edu
Newsgroups: comp.graphics
Subject: Fonts
Date: 6 Sep 92 01:26:37 GMT
Organization: Utah State University

Is anyone aware of any FTP sites that carry font files (in an IBM graphics
format)?

Josh
Newsgroups: comp.graphics
From: knut@uni-paderborn.de (Knut Menzel)
Subject: Need email address of Howard Rheingold
Organization: Uni-GH Paderborn
Date: Tue, 15 Sep 1992 09:12:18 GMT

Hello colleagues,

I want to come in contact with Howard Rheingold, author of

	"Virtual Reality"
	"Whole Earth Review"
	"Tools for Thought"

He is living anywhere in Mill Valley/California. Does 
anybody know is post or email address?

Please answer me via email...

-- Knut
--------------------------------------------------------------------------
 Knut Menzel                          University of Paderborn
 email:   knut@uni-paderborn.de       Department of Computer Science FB17
          ...!uunet!unido!pbinfo!knut Warburger Str. 100
 Tel:     +49 5251 603325             D-4790 Paderborn
 Telefax: +49 5251 603853
--------------------------------------------------------------------------
Newsgroups: comp.graphics
Subject: HELP with color printer
From: helen@shum.cc.huji.ac.il (Ilana Zommer)
Date: 14 Sep 92 13:10:27 GMT
Distribution: comp,world
Keywords: color printer
Summary: HELP with color printer


Hello World,
No this is not our first program(me) in C ! Though we are stuck, or
rather out of focus.
We are trying to write a program which sends lots of lovely colo(u)rs
to a colo(u)r printer B U T our particular bubble only has three (3)
colo(u)rs. We tried "dithering" (a new kind of dance that makes you
a little dizzy) but we were left with a poor quality picture (a shame
considering all the technology that went into a 300 dpi - Dizzy Paired
Individuals ?). We also tried ordered dithering (the flavours are a bit
nicer then the "of the shelf" kind but even so it is still rather bitty).

We are now making a desperate call for H E L P  (seriously) for
 1) any ideas of how to improve the quality of our prints.
 2) any other (preferably better) methods of getting 100's / 1000's of
   colo(u)rs out of only three (3) dots (CMY).

With much love (and a terrible headache)
 Shalom, Helen (p.s. the first word is my name - not a greeting though
 we are in favour of world peace and even more of the local kind.)

Please reply to helen@hope.cc.huji.ac.il