HDTenEightyP/NetNews huggingface dataset:
From: slumos@unlv.edu (Steve Lumos)
Subject: Re: wolf 3D
Organization: UNLV Computer Science
Date: Tue, 18 Aug 92 01:28:55 GMT

In article <713996198snx@nexnix.demon.co.uk> gary@nexnix.demon.co.uk (Gary Howland) writes:
>I used to program games back in my younger days, and knew some ridiculous
>algorithms for squeezing fast graphics (3-dimensional as well as normal stuff)
>out of the hardware I was using, but the speed at which wolfenstein-3D (apogee
>generates its images amazes me.  Can anyone give me a rough overview of how
>wolfenstein 3D generates its images?

This probably doesn't belong here, but I'm not sure where to direct
follow-ups to...

Try watching the game VERY closely. You will begin to notice alot of
little tricks that they use. The guards just bitmaps and have only 8
positions. Look carefully at the skeletons you see hanging around they
only have ONE position! The idea is that you are so busy playing the
game that you never notice that as you walk around a skeleton, you are
always looking at the front.

Anyway, it DOESN'T generate images at all. It stores them on a hidden
page and copies them.

-- 
Steve Lumos - slumos@cs.unlv.edu
From: ct@epcc.ed.ac.uk (C Thornborrow)
Newsgroups: comp.graphics
Subject: quaternions
Keywords: help quaternions code
Date: 19 Aug 92 15:06:10 GMT
Followup-To: comp.graphics
Organization: Edinburgh Parallel Computing Centre

My first introduction to the use of quaternions is from the SIGGRAPH 92 notes on
particle systems. As such, I have a very basic grounding in the ideas.

I wondered if anyone had built quaternion handling code (inverse, negate,
add) in C much in the same format as the Graphics Gems code that handles
vectors.

If not I am prepared to try and put this together. 

Can anyone suggest how I can extend quaternions to cope with n-dimensions ?

Chris.
From: foo@netcom.com (Mark Hall)
Newsgroups: comp.graphics
Subject: Re: Message system (was Re: The Best of SIGGRAPH 1992)
Date: 12 Aug 92 20:52:41 GMT
Organization: Netcom - Online Communication Services  (408 241-9760 guest)

In article <1992Aug12.170513.2425@nas.nasa.gov> uselton@wk207.nas.nasa.gov (Samuel P. Uselton) writes:
)In article <=13mrn=.foo@netcom.com> foo@netcom.com (Mark Hall) writes:
)>   In Room L-3 there was a printer, and one of the menu choices was 'print'.
)>
)Where was L-3? (rhetorical) When I'm running from place to place and
)still missing things and people because at SIGGRAPH I frequently want
)to be in 2 or 3 places at once, the messages need to be accessed at
)some "crossroads" through which I pass anyway, not hidden.

   L-3 was the first room on the left from the bus dropoff point at McCormick.
Newsgroups: comp.graphics
From: bschlesinger@nssdca.gsfc.nasa.gov (Barry Schlesinger)
Subject: Re: (04aug92) comp.graphics Frequently Asked Questions (FAQ)
News-Software: VAX/VMS VNEWS 1.41    
Organization: NASA - Goddard Space Flight Center
Date: Wed, 12 Aug 1992 13:22:00 GMT

In article <5663@m1.cs.man.ac.uk>, lilleyc@cs.man.ac.uk (Chris Lilley) writes...
>In article <10AUG199212454147@nssdca.gsfc.nasa.gov>
>bschlesinger@nssdca.gsfc.nasa.gov (Barry Schlesinger) writes: 
> 
>>A discussion of FITS basics and information appears regularly on
>>sci.astro.fits, providing some detail not available in the sci.astro 
>>FAQ cited. 
> 
>Meaning the pointer should be to that group? Is this a regular posting
>you refer to? If so, is it posted to news.answers or available by FTP
>anywhere...

	I think that sci.astro.fits should be mentioned first.  The
basics and information posting appears monthly, with a one-month
expiration period, to always be present on a system that honors
monthly expiration periods.  It may evolve into a formal FAQ posted to
news.answers, but the international FITS leadership has to decide on
that action.  There is a FITS anonymous directory on
nssdca.gsfc.nasa.gov that contains FITS references and information,
some FITS software and where to find other software, but it does not 
duplicate the basics and information posting.  The information from 
sci.astro.fits most relevant to this group (comp.graphics) is the 
following:

	FITS (Flexible Image Transport System) is a data format
designed to allow convenient exchange of astronomical data between
installations whose standard internal formats and hardware differ.
FITS is not principally a graphics format designed for the transfer of
pictures with standard support for many platforms included as part of
the package for decoding the image. Separate software must be
developed or obtained for converting the data from the FITS file into
a form that can be readily displayed. 

					Barry Schlesinger
					NOST FITS Support Office

Newsgroups: comp.graphics
From: gregh@alw.nih.gov (Gregory Humphreys)
Subject: Re: MAC Photoshop equivalent for PC's 
Organization: National Inst. of Health, DCRT, CSL
Date: Thu, 20 Aug 1992 13:55:11 GMT

In article <714040594snx@osea.demon.co.uk>, andy@osea.demon.co.uk (Andrew Haveland-Robinson) writes:
|> 
|> In article <5338@shum.huji.ac.il> klein@sunrise.huji.ac.il writes:
|> 
|> >Does anyone know of a software package for PC's that has as much functionality
|> >as the MAC PhotoShop package ? 
|> >
|> >I want to be able to scan in color images and manipulate them.
|> >
|> >  Thanks,
|> >
|> >     David Klein
|> >     KLEIN@SUNRISE.HUJI.AC.IL
|> 
|> I have used Aldus Photostyler for serious illustrations and retouching.
|> It has most of Photoshop's functionality, including soft-edges, editable
|> selections/masks etc...  Well worth a look, in anticipation of PhotoShop
|> for Windows.
|> 
|> Andy.
|> 
|> +-------------------------------------------------------------------------+
|> | Haveland-Robinson Associates     | Email: andy@osea.demon.co.uk         |
|> | Pine Cottage, Osea Island, Essex |        ahaveland@cix.compulink.co.uk |
|> | CM9 8UH England.  0621-88756     | Also:  081-800 1708  081-802 4502    |
|> +-------------------------------------------------------------------------+

Another Really Good Program Is Photofinish By ZSoft.
(ARGPIPBZ?  Not much of a ring there.  Oh well)

-- 
Greg Humphreys    |  "Playing not to win is like sleeping with your 
gregh@alw.nih.gov |  sister - sure, she's a great piece of tail, 
                  |  and she's got a bag full of goodies, but it's 
(301) 402-1817    |  just plain illegal."  -Charlie Sheen, "Hotshots"
Newsgroups: comp.graphics
From: barry@ramsey.cs.laurentian.ca (Barry G. Adams)
Subject: GKS package in Turbo C
Summary: Is there a public domain Turbo C package for GKS?
Keywords: GKS, Turbo C
Organization: Dept. of Computer Science, Laurentian University, Sudbury, ON
Date: Thu, 13 Aug 1992 13:25:58 GMT

  Is there a public domain GKS package or something similar
  in Turbo C that is available for PC's?  I am teaching an
  introductory computer graphics course and such a package
  would be quite useful.

  I have the software that is available for the book
  <<Computer Graphics: Principles and Practice>> by
  Foley, vanDam, et al. but it requires a mouse (mouse
  is not optional and many students don't have one) and
  is not public domain so I can't give it to the students
  anyway since I am not using the book for the course.

Newsgroups: comp.graphics
From: scip2053@nusunix3.nus.sg (ZHAO PEI)
Subject: where can i get data set for tongue ?
Organization: National University of Singapore
Date: Tue, 18 Aug 1992 08:22:54 GMT

Regards

Zhao Pei

Dept of Information Systems and Computer Science
National University of Singapore
Lower Kent Ridge Rd
Singapore 0511

Internet: zhaopei@iscs.nus.sg
	  scip2053@nusunix.nus.sg
Bitnet:   zhaopei@nusdiscs.sg

Newsgroups: comp.graphics,alt.3d
From: andrey@harry.ugcs.caltech.edu (Andre Yew)
Subject: Re: Why 3D clipping?
Organization: California Institute of Technology, Pasadena
Distribution: na
Date: Fri, 21 Aug 1992 03:00:45 GMT

thinman@netcom.com (Technically Sweet) writes:

>Why does a 3D object painter need to do 3D clipping?
>Is it necessary, or just a faster way of rejecting
>off-screen objects & polygons?

	It's faster for rendering, and you can also
clip to the space you need so you can increase the 
precision of your Z-buffer.

>Is it good enough if I transform all my 3D polygons to screen+Z 
>and then don't draw polys that are off the screen, or have
>a Z value that's greater than the viewpoint?  I.e. are behind
>the viewpoint?

>Will this work for both orthographic and perspective projections?

	For perspective projections, you need to clip Z,
otherwise objects that go behind the eye will not do the
right thing.

--Andre

--
Andre Yew                     andrey@through.ugcs.caltech.edu (131.215.131.169)
Organization: Middle East Technical University - Computer Center
Date: Thursday, 13 Aug 1992 14:55:57 TUR
From: <E59387@TRMETU.BITNET>
Newsgroups: comp.graphics
Subject: About graphic standarts?

   Hi,
   I need information about graphic standarts GKS,RGP,SRGP,PHIGS,SPHIGS.
Can you inform me about places where can I find information about these.

 Thanks in advance.
Newsgroups: comp.graphics
From: roihar@cc4.crl.aecl.ca
Subject: bitmaps
Organization: AECL RESEARCH
Date: Wed, 12 Aug 1992 20:18:15 GMT

I've seen annoying requests for bitmaps in a lot of newsgroups.
This is not one of them. This, however, is an annoying request for
a mailing list/newsgroup where this type of request is not shunned
and where people actually pay some attention (i.e. possibly even respond
) to such requests. Please tell me one exists! I have no access to
alt newsgroups because my feed comes from NRC in Ottawa and is strictly
scientific/business oriented groups. Does anyone know of mailing lists
discussing Postscript image swapping?
Newsgroups: comp.graphics
From: cheekin@flash.swl.spec.ptg.sony.co.jp (Tang Chee Kin)
Newsgroups: comp.graphics
Subject: test
Date: 17 Aug 1992 20:33:44 -0500
Organization: UTexas Mail-to-News Gateway
NNTP-Posting-Host: cs.utexas.edu


Testing 1 2 3

*******************************************************************************
*									      *
* Tang Chee Kin								      *
* SONY Precision Engineering Centre, Software R&D Laboratory 		      *
* Blk 12, The Mendel, #03-04 Science Park Drive, Singapore 0511		      *
* Tel : (065) 7765858		Fax : (065) 7795657			      *
* E-Mail : cheekin@swl.spec.ptg.sony.co.jp				      *
*									      *
*******************************************************************************

Newsgroups: comp.graphics,alt.3d
From: thinman@netcom.com (Technically Sweet)
Subject: Why 3D clipping?
Date: Thu, 20 Aug 92 16:53:00 GMT
Organization: International Foundation for Internal Freedom
Distribution: na

Why does a 3D object painter need to do 3D clipping?
Is it necessary, or just a faster way of rejecting
off-screen objects & polygons?

Is it good enough if I transform all my 3D polygons to screen+Z 
and then don't draw polys that are off the screen, or have
a Z value that's greater than the viewpoint?  I.e. are behind
the viewpoint?

Will this work for both orthographic and perspective projections?

The nature of my software is that almost all objects will be on-screen
almost all the time, so the efficient rejection thing is moot.

Thanks,

Lance Norskog
thinman@netcom.com
-- 

Lance Norskog

Data is not information is not knowledge is not wisdom.
From: msw1633@zeus.tamu.edu (Mark S. Whitsitt, N5RJF)
Newsgroups: comp.graphics
Subject: EPS from the original PS file
Date: 19 Aug 92 22:50:00 GMT
Reply-To: MSW1633@SUMMA.TAMU.EDU
Organization: Texas A&M University, Biochemistry Department
News-Software: VAX/VMS VNEWS 1.41

I have a couple of Postscript file and would like to be able to pull the output 
of the files into WordPerfect.  To do this, I need to convert 
(compile/interpret, whatever) the postscript language file to EPS file.  What 
can I use that might be free/shareware ?  Anything out there?  Thanks. 

Mark S. Whitsitt, N5RJF        Texas A&M University, Dept of Biochemistry
Internet:  msw1633@summa.tamu.edu 	  College Station, Tx. 77843-2128
AMPRnet:   n5rjf@n5rjf.ampr.org 			   (409) 845-0832
Packet/APLINK:  N5RJF @ KE5HE.TX.USA.NA
   "You can't throw darts when you're empty, man." - another Shadelism
Newsgroups: comp.graphics
From: crod@cc.curtin.edu.au (Scott Kevill)
Subject: Wireframe of a CSG object ???
Organization: Curtin University of Technology
Date: Fri, 21 Aug 1992 12:51:25 GMT

 
How does one create a wireframe respresentation of a CSG
(Constructive Solid Geometry) object?
 
I know that it is fairly easy to render these objects with
raytracing, but that is far too slow in a modelling situation.
 
Any help would be greatly appreciated.
 
Thanks,
      Scott
 
+-----------------------+--------------------------------------+
I Scott Kevill          I "Don't be paranoid,                  I
I crod@cs.curtin.edu.au I  everyone will hate you for it" - Me I
+-----------------------+--------------------------------------+
Newsgroups: comp.graphics
From: rdb@ktibv.uucp (The Graphical Gnome)
Subject: Re: Ray tracing a height field
Organization: KTI BV
Date: Thu, 13 Aug 1992 11:31:03 GMT

abucior@ugly.UVic.CA (Alan  Bucior) writes:

>I'm experimenting with some techniques of doing my own texture mapping,
>and I was wondering if anyone knew of a fast technique of intersecting
>rays with a height field.  Subdividing the height field into polygons
>is a possibility, but it just seems like there must be an easier and
>faster way. Does anyone have any ideas of how to intersect rays with a
>height field?

>Any help appreciated.
>Al.

You could look in the sources of POV and Rayshade, They both have it
in there package.


Happy Hacking "PABRAS"
(aka The Graphical Gnome)

-----------------------------------------------------------------------------
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| KTI bv             |-------------------------------| ---------------------|
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| 2700 AB Zoetermeer |   my life the way I want to."                        |
| The Netherlands    |   Jimi Hendrix                                       |
-----------------------------------------------------------------------------
From: spl@szechuan.uucp (Steve Lamont)
Newsgroups: comp.graphics
Subject: Re: SigGraph, Chicago, and Unions
Date: 15 Aug 1992 17:26:46 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
Distribution: usa
NNTP-Posting-Host: szechuan.ucsd.edu

In article <JIM.92Aug15004806@baroque.Stanford.EDU> jim@baroque.Stanford.EDU (James Helman) writes:
>Unless I'm mistaken, '89 was Chicago and '79 was Boston.

From the cover of "Computer Graphics," Volume 23, Number 23:
"SIGGRAPH `89 Conference Proceedings, 31 July - 4 August, Boston,
Massachusetts"

Dunno about `79.  That was before I was in the biz.

							spl
-- 
Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@dim.ucsd.edu
UCSD Microscopy and Imaging Resource/UCSD Med School/La Jolla, CA 92093-0608
"But is there hope to save/Even this ethereal essense from the grave?"
	- James Russel Lowell, "Ode Recited at the Harvard Commemoration"
Newsgroups: comp.graphics
From: karuzis@wccf.mit.edu (GLENN HOLM)
Subject: Agfa Color Pro Driver
News-Software: VAX/VMS VNEWS 1.41    
Keywords: film recorder postscript macintosh
Organization: MIT - Whitaker College
Date: Thu, 20 Aug 1992 02:00:00 GMT

my situation is this:  i have access to an Agfa Color Pro film recorder hooked 
up to a Macintosh (in another lab, but with right to use).  i'm sometimes 
asked to design slides, but really prefer to do them on a NeXT and walk them 
over.  The film recorder runs under Conductor (Agfa), and really wants input 
files to be in TIFF or PICT format.  I can do this on the NeXT, making 24 bit 
TIFFs, but get unacceptable cases of the jaggies when the bitmaps are scaled 
up to fit the slide (and a 3K by 2K by 24bit deep TIFF isn't going to fit on a 
floppy).  What i would LIKE to do is get the Agfa to inderstand PostScript.  
Do i have any options of getting PostScript into the film recorder, like with 
alternate driver software?  The thing handles PICTs and i can convert to PICT, 
but vectors are converted to raster, and the problem's the same. 

------------------------------------------------------------------
|Glenn Holm                         Internet:karuzis@wccf.mit.edu|
|M.I.T Dept. of Brain + Cog. Sci.   Bitnet:karuzis@mitwccf       |
|Cambridge, MA 02139       "Real Neuroscientists don't do gels!" |
------------------------------------------------------------------
Newsgroups: comp.graphics
From: huzhang@magnus.acs.ohio-state.edu (Hubao Zhang)
Subject: How to save a bitmap file onto a disk by using microsoft c++
Organization: The Ohio State University
Distribution: usa
Date: Thu, 20 Aug 1992 20:51:16 GMT

I am using Microsoft C++ (version 7.00) to do some animations on IBM 486.
I can animate my simulation results using bitmap structure and window classes,
but I do not know how to save the bitmaps onto disks as bitmap files. It
takes a while to create a bitmap. Every time I do the animation, I need to
recreate the bitmaps. It is realy a pain! If I could save the bitmaps as a 
file or files, I only need to load the bitmap into the memory and display them 
on the screens.
     Please help me out.
     huzhang@magnus.acs.ohio-state.edu
     Thank you very much in advance.
Newsgroups: comp.graphics
From: abucior@ugly.UVic.CA (Alan  Bucior)
Subject: SUMMARY: Ray Tracing Height Fields
Organization: University of Victoria, Victoria, BC, Canada
Date: Tue, 18 Aug 92 16:21:39 GMT

Thanks to everyone who responded regarding my post asking about how
to ray trace height fields.  To summarize, here are the two main sources
that I've found to be most useful:

"Grid Tracing: Fast Ray Tracing for Height Fields" by F. Kenton Musgrave
is a good starting point to look over, but his method is not the fastest.
It is available online via ftp from princeton.edu.  The document
is in pub/Graphics/Papers and is called musg88.ms.Z

Special thanks go to Eric Davies at the University of Waterloo for pointing
me to my second source:
"Parametric Height Field Ray Tracing", by David W. Paglieroni, and Sidney
M. Peterson is published as part of the Graphics Interface '92 Proceedings.
They discuss different ways to optimize height field ray tracing and explain
their technique which they claim:
	"The parametric method ran roughly 40 times faster than the
	 incremental method and roughly 6 times faster the hierachical
	 method."
Although I haven't fully read the document yet, I believe Musgrave's method
to be the incremental method (though I could be, and probably am, wrong).

Thanks again to all those who responded!
Al.




-- 
 Alan Bucior             |  University of Victoria  
 abucior@sirius.uvic.ca  |  Victoria, British Columbia, CANADA
From: kpm8447@tesla.njit.edu
Newsgroups: comp.graphics
Subject: Re: Speedstar 24X
Date: 23 Aug 92 13:15:47 GMT
Organization: New Jersey Institute of Technology

In article <LyJXPB1w165w@micromed.com>, diskount@micromed.com (don hirschfeld) writes:
> I was planning to get the Diamond Speedstar 24X next week. Has anyone 
> found another card with better speed or features for the price? Has 
> anyone found anything they do not like about it? Are the new 24bit S3 
> cards faster?

I have the 24x and it's great, very fast.
For windows: everything is fast and supports up to 16.8 mill color at 640x480.
for dos:there are drivers for acad, etc, but vpic and other .gif viewers
aren't compatible yet (they have to make new drivers)

The S3 uses VRAM (video ram) instead of the 24x's DRAM (Dynamic Ram)
so it would go even faster.  You have to justify the extra speed (I don't know
how much fast it is) to the $100 increase.  If you have the extra $100 to spend
get it.

 - Kirk
Newsgroups: comp.graphics
From: peter@sarek.ccs.uwo.ca (Mr. Peter Budgell)
Subject: Re: Public Domain 2-D/3-D Plot Packages
Organization: University of Western Ontario, London
Date: Wed, 19 Aug 1992 15:28:47 GMT

In article <23818@oasys.dt.navy.mil> kass@oasys.dt.navy.mil (Michael Kass) writes:
>I'm looking for a public domain plotting package using X-windows that can
>do a variety of plots, with an easy user interface, and can output to 
>a Postscript format file.  Does anyone know where I could find one?
>
>Thanks.

For 2D work try the x version of grtool; here is where it was
located the last I heard:


> Xvgr (XView version) and xmgr (Motif version) are located at amb4.ese.ogi.edu 
> [129.95.20.76] in pub/acegr/xvgr-2.07.tar.Z and pub/acegr/xmgr-2.07.tar.Z, resp. 
> They were moved from ese3.ese.ogi.edu a couple of months ago, but archie 
> apparently has the old address, at least it did the last time I looked.
> 
> Paul J Turner - pturner@ese.ogi.edu
> Center for Coastal and Land-Margin Research
> Oregon Graduate Institute
> Beaverton, OR 97006-1999
 

Xref: sparky comp.graphics:9036 alt.flame:12221
From: spl@ivem.uucp (Steve Lamont)
Newsgroups: comp.graphics,alt.flame
Subject: Re: SigGraph, Chicago, and Unions
Date: 21 Aug 92 02:47:12 GMT
Followup-To: alt.flame
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
NNTP-Posting-Host: ivem.ucsd.edu

In article <64360@cup.portal.com> Chris_F_Chiesa@cup.portal.com writes:
+The whole "union problem" in a nutshell seems, to me, to come from the fact
+that too damn many people today seem to regard coffee breaks, etc., as some
+kind of a RIGHT, rather than a PRIVILEGE.  I deem it an A/V (or any other)
+employee's DUTY to stay and stand by his equipment no matter HOW long or HOW 
+"breakless" a stretch that amounts to, taking NO coffee break at all if that's
+what it comes to.  
+ ...
+Lest you think I'm Management, know ye that I am a worker myself and that
+I practice what I preach.  I spend my eight- (usually MORE than eight) hour 
+workday either at my desk or solving crises not far from it, NOT in the cafe-
+teria swilling coffee and scarfing doughnuts. ...

I presume you go to the lavatory on your own time.  Or do you wear
"Depends" and dump them when you get home?

I'll bet you're fun at the annual office picnic.

Followups to alt.flame.

							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
From: ncc1701@madoka.its.rpi.edu (Mark O. Chadwick)
Subject: Re: RayShade, Animator, TgaFli & AaPlay
Reply-To: ncc1701@acm.rpi.edu
Date: Thu, 13 Aug 1992 18:14:06 GMT

Try using Dave's Targa Animator (dta15e.zip)..This works really
well, and produces a single optimized palette at the same time.

It's available from various places, none of which I can
recall at the moment.  If you're desperate, email me and
maybe I can mail you one.

-- 
---
Mark "Emerson" Chadwick -- ncc1701@acm.rpi.edu    chadwickmo@space.laafb.af.mil
Newsgroups: comp.graphics