HDTenEightyP/NetNews huggingface dataset:
From: dfr@usna.navy.mil (PROF D. Rogers (EAS FAC))
Newsgroups: comp.graphics,comp.windows.x.pex,comp.graphics.opengl
Subject: Re: Row major or column major matrices?
Date: 27 Jan 93 18:36:02 GMT
Followup-To: comp.graphics
Organization: U. S. Naval Academy

In article <1993Jan26.002210.18638@mapsut.einstein.com> jasper@iris.einstein.com (John Scott Peter XXXIII) writes:
!Well, I eagerly await your agent of dismemberment....
!
!Actually, I have no clear preference, and I'll explain why.  In all my
!education (math and physics, B.S Physics UCLA 1986), only row-major matrices
!were used, so I naturally think of that as the standard.  However, I have an
!idea as to why so many people are switching to column-major notation.  It's
!so that matrices can be post-multiplied instead of pre-multiplied!  Post-
!multiplication notation accords better with the compound operators of C and
!C++.  If you're writing a matrix class in C++, and you want to multiply one
!matrix by another, it seems natural to define the operator `*=' as the
!multiplication operator, such that:
!
!    A *= B means A = A * B.
!
!I was writing such a class for a simple 3-D graphics program, and I quickly
!realised that the most common multiplication I wanted to do was PRE-
!multiplication.  I therefore said `Screw convention', and defined `*=' so
!that
!
!    A *= B means A = B * A.
!
!So, my solution was to change the standard C relationship between `*=' and
!`*'.  Apparently, others decided it was better to change the very operation
!of matrix multiplication to imply a column-major order, so that `A *= B'
!would still mean `A = A*B'.

To heck with C and C+ and Fortran etc. You'll should really look
at how ANSI BASIC (yes that nasty word) handles matrices. How about
like a mathematician would? Yup that's the way they do it AND
it is all built into the language! Amazing. When are these modern
langauage designers going to get with it.

Dave Rogers
Newsgroups: comp.graphics
From: paik@mlo.dec.com (Samuel S. Paik)
Subject: Re: PoV question: Is there a way to render shadows but not objects?
Organization: Digital Workstations Software Group
Date: Fri, 22 Jan 1993 01:23:39 GMT

In article <1j761gINN8ps@topper.ksu.ksu.edu> jregehr@topper.ksu.ksu.edu (John David Regehr) writes:
>
>I am working on raytracing groups of plants, and I would like to make
>images of just the shadows cast by the plants - sort of the opposite of
>using the noshadows keyword.  
>If anyone knows how to do this, I'd like to hear from you.  Thanks.

Here are two ideas:

If you have source code to the ray tracer, you could modify the
lighting code so that shadow rays stop at all surfaces, or, more
flexibly, stop shadow rays at all surfaces that have some (new)
attribute set.  The last could be hacked quickly if you select some
existing attribute you aren't using and use that.  However you might
want to cast ``transparent'' shadows...

In Renderman, here is a simple idea:

Use shadow depth maps for the lights.  Do the shadow depth maps with
all the scene objects, then render the scene, using those shadow depth
maps, but without the objects you don't want to see.

Sam Paik
From: joshuaf@yang.earlham.edu
Newsgroups: comp.graphics
Subject: DL shows
Date: 26 Jan 93 16:13:48 GMT
Organization: Earlham College, Richmond, Indiana

Where can I find DL, or other forms of animation graphics using
ftp?  Does anyone know of any sites that have these forms of 
graphics?

thanks in advance...

Joshuaf

email or news reply accepted and appreciated.
Newsgroups: comp.graphics
From: mavuduru@peca.cs.umn.edu (Rama Mavuduru)
Subject: Re: jobs in computer graphics
Organization: University of Minnesota
Date: Sat, 23 Jan 1993 05:37:32 GMT

In <1993Jan22.181922.13624@wam.umd.edu> slt@wam.umd.edu (Sarah Louise Timko) writes:

>Hi, I'm not sure if this is the right place to ask this but it
>doing art and animation on the computer.  Other than playing with
>packages, how do I learn enough to get a job in this field,
>Is there any good way to get a job, and in what area are most
>of the companies?   



	The best place to look for answers to such questions is:

		SIGGRAPH Computer Graphics CAREER HANDBOOK,
		published in 1991.

	It has information about schools, courses, companies,
	career profiles, etc.

---
Rama Mavuduru
Newsgroups: comp.graphics,comp.windows.x.pex,comp.graphics.opengl
From: ledwards@leland.Stanford.EDU (Laurence James Edwards)
Subject: Re: Row major or column major matrices?
Organization: DSG, Stanford University, CA 94305, USA
Date: Tue, 26 Jan 93 01:53:41 GMT

In article <1993Jan25.013450.334@leland.Stanford.EDU>, ledwards@leland.Stanford.EDU (Laurence James Edwards) writes:
|> In article <1993Jan22.124249.3817@eye.com>, erich@eye.com (Eric Haines) writes:
|> |> I feel vaguely like I'm in a twilight zone episode.  You know, like the ones
|> |> where some guy wakes up and finds that all the lettering is backwards and
|> |> everyone is left-handed.
|> |> 
|> |> Someone was telling me that OpenGL allows only post-concatenation of matrices
|> [...]
|> 
|> It's even more surprising since the current version of GL normally
|> pre-concatenates. I can imagine some hard to find bugs when people port old GL
|> code in which they generate their own matrices from scratch.

Knowledgeable sources inside SGI inform me that the OpenGL spec's are just
written using column vectors and post-concatenation because of the notational
preferences of the author(s) ... the actual hardware will still be doing
pre-concatenations. Actually, this is clear from what Eric said. As Eric
indicated, in the OpenGL spec they show matrices stored in column major order,
whereas in reality C stores matrices in row major order, so effectively what
they've done in the diagrams is transpose the matrices ... hmmm I can think of
less confusing ways to write a spec.

Larry Edwards
  
Newsgroups: comp.graphics
From: thinman@netcom.com (Technically Sweet)
Subject: Re: DNA molecular structure coordinates
Organization: International Foundation for Internal Freedom
Date: Wed, 27 Jan 1993 03:08:10 GMT

andy@osea.demon.co.uk (Andrew Haveland-Robinson) writes:


>Hi folks,

>I'm processing about 700 images for a new genetics reference book
>and am faced with drawing some really complex illustrations which would take
>about 30 hours to do by hand... (!)

>Being fairly fluent with PoV, Vivid, 3ds2 and Polyray and learning C
>I wonder if anyone knows where I could obtain position and atomic size
>info for Z DNA, B DNA and A RNA to render as spheres...

It will take you at least a month to do this on a computer...

-- 

Lance Norskog
thinman@netcom.com
Data is not information is not knowledge is not wisdom.
Newsgroups: comp.graphics,comp.graphics.visualization
From: janson@athena.mit.edu (james anderson)
Subject: geodesic projection
Followup-To: comp.graphics.visualization
Organization: Massachusetts Institute of Technology
Date: Tue, 26 Jan 1993 12:08:13 GMT

greetings graphics gurus,

doe sanyone know a source for an algorithm to project
arbitrary geodesics onto a plane? 

thanks,
james.


Newsgroups: comp.graphics
Organization: Arizona State University
Date: Tuesday, 26 Jan 1993 00:41:19 MST
From: Eric Davis <ICEND@ASUACAD.BITNET>
Newsgroups: comp.graphics
Subject: Re: Needing 3D Studio 2.0 Objects
Distribution: world

In article <1k0u63INN824@mailgzrz.TU-Berlin.DE>,
chribeag@w254zrz.zrz.tu-berlin.de (Christian Klass) says:
>
>Hello there,
>I`m desperatly looking for 3D objects, which I can use for
>3D Studio (from Autodesk). Is there a site where I can get
>those objects or programs which can convert between different
>object-formats?
>
>Please help me...

I would like to know also.
Newsgroups: comp.graphics
From: jsuen@sfsuvax1.sfsu.edu (Julian Suen)
Subject: Re: Diamond Stealth VRAM
Organization: San Francisco State University
Distribution: SFSU
Date: Fri, 22 Jan 1993 18:56:11 GMT

 Does anyone have the Diamond Stealth VRAM card and the manual?
 I never received mine, and all I need to know is the DIP switches
 in the card!  Can anyone tell me the DIP switches???  I am have
 problem showing the card on my 1024x768 NI monitor.  Can't center
 the screen and there is
 a click in the monitor every time switch to graphic mode from
 text...
From: 92640937s@sgcl1.unisg.ch
Newsgroups: comp.graphics
Subject: GIF ??
Date: 28 Jan 93 21:26:41 GMT
Organization: University of St.Gallen, Switzerland


Can anyone tell me what GIF-graphics are and how I can get them on my 
PC screen?? (What kind of program to use)

92640937s@sgcl1.unisg.ch

Thanks in advance.

Rob
Newsgroups: comp.graphics
From: pes@hutcs.cs.hut.fi (Pekka Siltanen)
Subject: B-spline curves
Organization: Helsinki University of Technology, Finland
Date: Fri, 22 Jan 1993 06:32:08 GMT

Suppose an open  uniform cubic B-spline curve Q(t),0<= t<= 1  which is defined
by control points V1, V2, V3 and V4.

Is it possible to find a uniform cubic B-spline curve C(u)=Q(t), whose control
points are W1,..,Wn  and first and last control points are
triple points: 
Q(0) = W1 = W2 = W3 and Q(1) = Wn-2 = Wn-1 = Wn ?

Any help or reference appreciated.

Pekka Siltanen
Newsgroups: comp.graphics
From: mespinoz@dcc.uchile.cl (Mario Espinoza)
Subject: [Q] Postscript to HPGL converter...
Originator: mespinoz@dcc.uchile.cl
Date: Tue, 26 Jan 1993 15:18:47 GMT
Organization: Universidad de Chile, Depto. de Ciencias de la Computacion

Im looking for a utility for converting color Postscript to HPGL. (a PD one).
Im trying to print X windows on a HP color printer (XL300).
I would appreciate any hint...

Thanks in advance
Newsgroups: comp.graphics
From: andy@osea.demon.co.uk (Andrew Haveland-Robinson)
Distribution: world
Subject: DNA molecular structure coordinates
X-Mailer: cppnews $Revision: 1.14 $
Organization: Haveland-Robinson Associates
Date: Sun, 24 Jan 1993 07:19:37 +0000


Hi folks,

I'm processing about 700 images for a new genetics reference book
and am faced with drawing some really complex illustrations which would take
about 30 hours to do by hand... (!)

Being fairly fluent with PoV, Vivid, 3ds2 and Polyray and learning C
I wonder if anyone knows where I could obtain position and atomic size
info for Z DNA, B DNA and A RNA to render as spheres...

Someone, somewhere must have been doing this and released something to PD..

Be grateful for any help.

Andy.

+-----------------------------------------------------------------------+
| Haveland-Robinson Associates   | Email: andy@osea.demon.co.uk         |
| 54 Greenfield Road, London     |        ahaveland@cix.compulink.co.uk |
| N15 5EP England. 081-800 1708  | Also:  0621-88756 081-802 4502       |
+-----------------------------------------------------------------------+
<<>> Those that can, use applications. Those that can't, write them! <<>>
> Some dream of doing great things, while others stay awake and do them <
Newsgroups: comp.graphics,comp.parallel
From: sundar@cis.ohio-state.edu (N Sundar)
Subject: Wanted: references to parallelizing radiosity
Organization: The Ohio State University Dept. of Computer and Info. Science
Date: 27 Jan 1993 01:46:34 -0500


Can somebody please email me or post here any references - especially of the
survey kind - that deal with parallelizing the radiosity algorithm for
computer rendering? 

Sundar.
-- 
---------------------------------------------------------------------------
N. S. Sundar          | If you dwell upon New Mexico long enough, you are
GTA, CIS, OSU         | bound to face Truth or Consequences sooner or later.
Off. ph: 292-4029     |         ( Puzzled?  Look up the map. )

Newsgroups: comp.graphics
From: diegel@mcshh.Hanse.DE (Jan Diegelmann)
Subject: GIF view for DEC REGIS???
Organization: Point of Presence & MCS Hamburg
Date: Sat, 23 Jan 1993 12:21:46 GMT
Keywords: DEC, REGIS, GIF


Hi!

Is there any GIF viewer for DEC graphic terminals ( vt125, vt240, vt330 )
with the DEC REGIS graphic instruction set?

                                                                  ,,,
                                                                 (o o)
-------------------------------------------------------------oOO--(_)--OOo---
Jan Diegelmann * Stammannstr. 31 * 2000 Hamburg 60 * FRG * voice: 040-2719824
e-mail: diegel@mcshh.hanse.de
Newsgroups: comp.graphics
From: stgprao@st.unocal.COM (Richard Ottolini)
Subject: Re: POLYGON DECIMATION of big geometries
Organization: Unocal Corporation
Date: Fri, 22 Jan 1993 15:51:34 GMT

Other decimation heuristics include:
	- if neighboring normals are "not very different", merge the polygons;
	- polygons with long aspect ratios should be merged with beighbors in the shorter
          direction
Newsgroups: comp.graphics
From: pclink@cheops.qld.tne.oz.au (Rick)
Subject: Re: POVRAY made easy
Organization: Telecom Australia, TNE Computer Support Services
Date: Wed, 27 Jan 1993 02:14:37 GMT

aron@taos.ced.berkeley.edu (aron bonar) writes:

>PV3D is a front end modeler for POVRAY.  Shareware, I believe.  I haven't seen it
>on the net but you can get off a couple of BSS's...The Graphics Alternative or 
>You Can Call Me Ray...sorry..don't have the numbers on me.

pv3d is available on wuarchive.wustl.edu in:
graphics/graphics/mirrors/ftp.informatik.uni-oldenburg.de/pub/dkbtrace/incoming
as files pv3d-img.zip, pv3d1scn.zip, pv3db020.zip and pv3d.txt.

Rick.
From: mal4@ns1.cc.lehigh.edu (Marty Lamb)
Newsgroups: comp.graphics
Subject: Need FAST hidden line removal
Date: 23 Jan 93 19:37:10 GMT
Organization: Lehigh University

Hi -

     For a side project I'm working on, I'm doing some wireframe animation -
     the only problem is that I can't think of any ways to do hidden line
     removal FAST. . . any suggestions?

     Thanks in advance,
     Marty


     
-- 

 ___________________________________________________________________________
/-------------------------------------------------------------------------/|
|  Be like the 22nd elephant with     |     Marty Lamb   (215)758-1921    ||
|  heated value in space.   Bark!     |     Box 0151                      ||
|--------------------------------------     Lehigh University             ||
|  mal4@lehigh.edu                    |     29 Trembley Dr.               ||
Newsgroups: comp.graphics
Subject: 3D Studio 2.0 Export-files 
From: earrond@calstatela.edu (Ellis Arrondo)
Date: 25 Jan 93 14:47:01 PST
Reply-To: earrond@calstatela.edu
Distribution: world
Organization: Cal State University, Los Angeles
Keywords: File_formats, 3-D_Studio 

	Is there away to export 3-D Studio files and is there a description of the file format.
	I have only seen an ascii export file but no description of the file format.
	Does there exist a binary file format? I would like to import the format into other
        renderers on faster machines. 

	Any page numbers in manuals to turn to or information regarding the file format
	would be appreciated.

	Ellis Arrondo

	earrond@mars.calstatela.edu
From: crm7479@zeus.tamu.edu (MARTIN, CHRISTOPHER RAY)
Newsgroups: comp.graphics
Subject: The FAQ and raytracing software
Date: 26 Jan 1993 13:11 CST
Organization: Texas A&M University, Academic Computing Services
Distribution: world
NNTP-Posting-Host: zeus.tamu.edu
News-Software: VAX/VMS VNEWS 1.41    

	Could someone please repost the FAQ or mail me a copy? also 
where is a good ftp site for MSDOS raytracing software... does anyone
have any recommendations? Thanks, Chris.
From: hong@cipr-psych.nmr (Hong-Jain Jiang)
Newsgroups: comp.graphics
Subject: segmentaion/edge_detection routine wanted
Keywords: segmentaion, edge_detection
Date: 21 Jan 93 21:50:58 GMT
Reply-To: hong@cipr-psych.nmr
Organization: Sun Microsystems, Inc.

Hi there:

I am looking for some ftp sites which have some image 
segmentation, edge/boundary detection programs. I am 
trying to do segmentation on medical images with fuzzy 
boundaries. Any help is greatly appreciated.

Hong Jiang
Mass General Hospital
Newsgroups: comp.graphics
From: len@mel.dit.csiro.au (Len Makin)
Subject: Re: Plotting Graphs
Organization: CSIRO DIT (Melb.)
Date: Fri, 22 Jan 93 00:58:57 GMT


In article <hrpctw.13@pnv.palm.cri.nz>, news@massey.ac.nz (USENET News System) writes:
|> Does anybody out there have a set of data plotting routines, or know of
|> an ftp site where they would be available.
This is certainly a candidate for FAQ.Others have put answers up during December
but our newsfeed has scrapped last years stuff. 
Is there a comp.graphics archive?Here's an attempt at an answer:

Gnuplot is a command-driven  interactive  function  plotting
     program.Runs on just about any machine, very flexible in
     output devices too. Available from many places e.g. ames.arc.nasa.gov
ACE/gr (xmgr - Motif/xvgr - XView) is a data/function plotting tool for 
     workstations or X-terminals using X. Available from ftp.ccalmr.ogi.edu
robotx (Robot) is a general purpose plotting and data analysis program.
     Requires XView, X-terminal or workstation.
     Available from sunsite.unc.edu

Len.Makin@mel.dit.csiro.au               | Senior Computer Scientist    |
CSIRO Division of Information Technology | Supercomputing Support Group |
723 Swanston Street, Carlton             | Tel: +61 3 282 2622          |
VIC 3053, Australia                      | Fax: +61 3 282 2600          |

Newsgroups: comp.privacy,alt.privacy
From: geoff@ficus.cs.ucla.edu (Geoffrey Kuenning)
Subject: Anti-privacy (was: Re: Op-ed piece on telephone Caller ID)
Organization: UCLA, Computer Science Department
Distribution: usa
Date: Fri, 22 Jan 93 19:17:03 GMT

In article <1993Jan22.010748.16128@samba.oit.unc.edu>
Terry.Parks@launchpad.unc.edu (Terry Parks) writes:

> Since I, not the anti-privacy folks, pay for my telephone, can I have my
> Caller ID now.

I think we need to clarify some terminology here.  Terry seems to be
using "privacy" to refer to his right not to be interrupted in his
home.  He views Calling Number ID (which is *not* Caller ID, no matter
how often anyone refers to it by that convenient name) as a route to
achieving this.

Most of the other people who read this group are using "privacy" to
refer to their right to keep to themselves any and all information
which they consider to be nobody else's business.

Terry, attempting to label the latter people "anti-privacy" is not
only inaccurate, but a sure way to earn enemies while ensuring that
your arguments are ignored.

The problem with Calling Number ID is that there is a collision
between the two forms of privacy.  Terry, almost nobody on this forum
has a problem with your desire to have CNID on your home phone (though
I suspect you would find features like "privacy ring" cheaper and
more convenient).  And I hope that you have no problem with my desire
to keep my name off of junk mailing lists.

Now, instead of name-calling and pointless flames, how about some
constructive suggestions that allow Terry to screen calls while not
requiring me to hand out my unlisted phone number to every party I
call?
-- 
	Geoff Kuenning	geoff@maui.cs.ucla.edu	geoff@ITcorp.com
Newsgroups: comp.privacy,alt.privacy
From: jgd@dixie.com (John De Armond)
Subject: Re: Op-ed piece on telephone Caller ID
Date: Thu, 21 Jan 93 06:13:05 GMT
Organization: Dixie Communications Public Access.  The Mouth of the South.
Distribution: usa

bml@netcom.com (Brian Leibowitz) writes:

>NOTE: the customer service people I first contacted assured me that my number
>is not divulged to 800 numbers.  Since an outomated 800 number I called knew
>where I was calling from without my indicating it, I knew this was wrong.

I can assure you that any 800 number that wants it can get ANI which is
a separate service than caller*ID.  Not only do they get real time 
ANI, the number and (if desired) the name of the calling party is available
on billing records (printed or magnetic media).

>Does anyone know if long distance calls are identified by caller ID?  In a
>non-caller ID state, people think that they have privacy
>(It never occured to me that 800 numbers would have the caller ID for me
> until it happened to me.)

Yes as are 900, 976 and any other call.  ANI can be had even for local
non-toll calls.  


>Brian   (personally, I have no objection to caller ID as long as there is
>         an easy way to block it [at no charge] including a line block so

Note that caller*ID block does NOT block ANI.  ANI is a billing service
provided to service providers.

John
-- 
John De Armond, WD4OQC               |Interested in high performance mobility?  
Performance Engineering Magazine(TM) | Interested in high tech and computers? 
Marietta, Ga                         | Send ur snail-mail address to 
jgd@dixie.com                        | perform@dixie.com for a free sample mag
Need Usenet public Access in Atlanta?  Write Me for info on Dixie.com.
Xref: sparky comp.privacy:19 alt.privacy:3023
From: usviking@slepnir.linet.org (usviking)
Newsgroups: comp.privacy,alt.privacy
Subject: Re: Op-ed piece on telephone Caller ID
Date: 21 Jan 93 20:10:56 GMT
Organization: Society for the Elimination of Forgetfulness and... umm...

Terry.Parks@launchpad.unc.edu (Terry Parks) writes:

> we are already on. We also, of course, in the absence of Caller ID never
> give out information to businesses on the phone:
> 
> 	"Hello, Pete's Pest Control"
> 	"I'm overrun with ants, please come soon."
> 	"Well, what's your name and address."
> 	"I'm not going to tell you, it's my privacy."
> 	"Click...."

Bad example. Ordered a pizza by phone lately? Called for a taxi? To
check movie times? To order tickets? I pay to keep my number unlisted,
thankyouverymuch. I'd rather choose who has access to that information.

-- [TANSTAAFL] --- USViking@slepnir.linet.org --- 1:107/236.1 Fight-O-Net ---
"Destruction of the empty spaces is my one and only crime."  -  Black Sabbath
JR / POB 179 / Greenlawn NY 11740 USA | Free Cyberia | Visualize Whirled Peas
Xref: sparky comp.privacy:27 alt.privacy:3111
From: edp@math.zk3.dec.com (Eric Postpischil)
Newsgroups: comp.privacy,alt.privacy
Subject: Re: Op-ed piece on telephone Caller ID
Date: 28 Jan 93 15:57:02 GMT
Reply-To: edp@math.zk3.dec.com (Eric Postpischil)
Distribution: usa
Organization: Digital Equipment Corporation

In article <1993Jan22.161216.27398@ll.mit.edu>, nates@ll.mit.edu ( Nate
Smith) writes:

>just what is Caller ID going to do for you?  the phone rings.  the display
>shows a number you've never seen before.  are you going to answer it?

No, my answering machine answers it.


                                -- edp (Eric Postpischil)
                                "Always mount a scratch monkey."
                                edp@rusure.enet.dec.com
Xref: sparky comp.privacy:26 alt.privacy:3106
From: msaletni@jade.tufts.edu (Michael J. Saletnik)
Newsgroups: comp.privacy,alt.privacy
Subject: Re: Op-ed piece on telephone Caller ID
Date: 28 Jan 93 17:48:18 GMT
	<1993Jan22.010748.16128@samba.oit.unc.edu>
	<1993Jan22.161216.27398@ll.mit.edu>
	<1993Jan28.155702.21289@nntpd.lkg.dec.com>
Distribution: usa
Organization: Tufts University - Medford, MA

<nates@ll.mit.edu>
   just what is Caller ID going to do for you?  the phone rings.  the display
   shows a number you've never seen before.  are you going to answer it?

<edp@math.zk3.dec.com>
   No, my answering machine answers it.


And what if that was one of your friends calling, they're at a
restaurant or bar or just at a pay phone, they wanted to catch you to
join them, but "you're not home, so bye!" ?

Or even worse, if the moment they hear the answering machine they
assume you're not home, and just hang up since the message is only
relevant if you can speak immediately?

Where do you draw the line between privacy and isolationism?
Personally, if I had to reach you for some reason, and had to
constantly deal with your machine, I would give up, be it my loss or
yours.

					Michael
--
Michael J. Saletnik, Tufts University E'91 G'93
michael@binkley.ext.tufts.edu msaletni@pearl.tufts.edu
TA & Manager of Computer Resources, Dept. of Civil Engineering
Newsgroups: comp.privacy,alt.privacy