HDTenEightyP/NetNews huggingface dataset:
From: frank@whare.cavebbs.welly.gen.nz (Frank van der Hulst)
Newsgroups: comp.graphics
Subject: Help: How to create a "Smooth Triangle" scene for POV
Date: 22 Aug 92 09:34:31 GMT
Organization: Tech-Soft Systems, Wellington NZ

I have a set of points (triangles) representing a human head I've
converted into the Persistence of Vision raytracer scene format. This
looks OK, but I'd like to try using POV-ray's Smooth Triangle object
type to improve how it looks. To do that I need to calculate the surface
normal for each traingle. The POV-ray documentation says the following:

       2) If your original data was a polygon or triangle mesh,
       then it's not quite so simple. You have to first calculate the
       surface normals of all the triangles. This is easy to do - you
       just use the vector cross-product of two sides (make sure you get
       the vectors in the right order). Then, for every vertex, you
       average the surface normals of the triangles that meet at that
       vertex. These are the normals you use for smooth triangles. Look
       for the utilities SANDPAPER and TXT2POV.

My questions:
1.  Can anyone give me a pointer to either of these utilities?

2.  Failing that, how about a pointer to some code for calculating
    vector cross-products?

Thanks.

Frank.
Newsgroups: comp.graphics
From: fellow@natinst.com (Osbert Tan)
Subject: Scanner -> Phigs
Organization: National Instruments, Austin, TX
Date: Mon, 17 Aug 1992 22:16:04 GMT


 As a neophyte in the PHIGS world, I would like to know how people convert
 data output from a 3D scanner (I have no idea what format they're in either)
 to a form that can be drawn using PHIGS. Such that a solid object can be
 modelled pretty easily on a graphics workstation. It will be beneficial to me 
 if someone can share her/his experience in designing such interface/form of 
 data format to be used by PHIGS. Any experience similar to the above mentioned
 is also greatly appreciated.

Thanks,

-Osbert

-- 
                                     _ _
---------------------------------ooo--U--ooo------------------------------------
fellow@cs.utexas.edu  Standard disclaimer applies. My opinions are, simply mine.
fellow@natinst.com            Down with racism. Down with imperialism.  
Newsgroups: comp.graphics
From: stgprao@xing.unocal.com (Richard Ottolini)
Subject: Re: Is there a mathematical relationship RGB -> wavelength?
Originator: stgprao@xing
Organization: Unocal Corporation
Date: Mon, 17 Aug 1992 03:32:05 GMT

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 assume every has seen the optical illusions where
moving B&W objects appear to have color.
I recall an articlein Scientific American on the psychology of color perception
within the last two years, but I don't have the reference at hand.
Newsgroups: comp.graphics
From: eugene@wilbur.nas.nasa.gov (Eugene N. Miya)
Subject: Re: Quaternion questions
Organization: NAS, NASA Ames Research Center, Moffett Field, CA
Date: Wed, 19 Aug 92 23:52:56 GMT

I leave this group to be accosted by five people to say to return.
...

These are good solid technical questions.

Can you handle yacc and lex?

A friend had me post his fairly complete quaternion math routines
in yacc and lex (a calculator extrapolated from the hoc calculator
in Kernighan and Pike, an excellent example of code development
[with an intermediate stage as a complex number calculator]).
If needed, we can repost.  Should probably go to comp.source.misc.
Give the word.

--eugene miya, NASA Ames Research Center, eugene@orville.nas.nasa.gov
  Resident Cynic, Rock of Ages Home for Retired Hackers
  {uunet,mailrus,other gateways}!ames!eugene
Second Favorite email message: Returned mail: Cannot send message for 3 days
A Ref: Mathematics and Plausible Reasoning, vol. 1, G. Polya
From: lordSnooty@cup.portal.com (Andrew - Palfreyman)
Newsgroups: comp.graphics
Subject: Re: 24-bit color, 4 megabyte VRAM Tseng video card???
Date: Fri, 14 Aug 92 20:17:22 PDT
Organization: The Portal System (TM)
Distribution: world

Jim Lick writes:
: Eric Praetzel (praetzel@sunee.uwaterloo.ca) just posted an article which
: briefly mentioned a 24 bit, 4 megabyte Tseng video card he had heard about
: for PC compatibles.  I asked him for more info, but he has very little info
: other than it will be announced soon in NZ for around $400 to $500 NZ$.  He
: also mentions that it is a localbus card.  Has anyone else heard of this?
: Any vendors which have or will have it?  Ideally I'd like the above, but
: with EISA instead of localbus interface.

I have something similar. It's the Genoa Technology 7900 board with 1 MB and
the 24-bit AT&T DAC fed from the Tseng 4000X hi-res chip, ISA bus.
$140 trade-in price. They're in the San Jose directory.

I am very pleased with the product btw.
 --------------------------------------------------------------------------
| lord snooty @the giant | Would You Like Fries With That?                 | 
| poisoned electric head |              andrew_-_palfreyman@cup.portal.com |
 --------------------------------------------------------------------------
From: kpm8447@tesla.njit.edu
Newsgroups: comp.graphics
Subject: Diamond 24X problems
Date: 16 Aug 92 18:26:41 GMT
Organization: New Jersey Institute of Technology

I just got the Diamond Speedstar 24x (Bios Version 1.01-6)
I can't get it to work with Vpic 5.0 which has a driver for diamond.
I assume it doesn't work because the card just came out and there may
be programming bugs in vpic.  Does anyone else have this trouble or
does anyone have a program that works (showing 16.8 mil in 640 and
32k in 800) for viewing .tga files?
 - Thanks in advance
 - Kirk
From: br707@cleveland.Freenet.Edu (Mike L. Melamed)
Newsgroups: comp.graphics
Subject: request: TERMINATOR 2
Date: 12 Aug 92 17:37:35 GMT
Organization: Case Western Reserve University, Cleveland, Ohio, (USA)


Could someone please post some pictures of TERMINATOR 2?




I would REALLY, REALLY, REALLY! APPRICIATE IT!!


--
From: mohta@necom830.cc.titech.ac.jp (Masataka Ohta)
Newsgroups: comp.graphics
Subject: Re: The Best of SIGGRAPH 1992
Date: 13 Aug 92 04:29:54 GMT
Organization: Tokyo Institute of Technology

In article <tromo.713569777@keckiris> tromo@rice.edu (Tod Romo) writes:

>>   Part of the crowding problem came from people abusing the telnet 
>>privileges. There were some people reading News at the machines.

>Just allocate enough time to telnet to a host, read
>mail and post a few messages, then logout.

If there has been enough number of terminals, there wouldn't be
a problem.

Considering the scale of the conference, I think 20 (I guess) terminals
are too few.

>I find nothing wrong with someone reading News, practicing file
>management, or whatever at 9pm when there's almost noone else around.

The problem was that the room closed at 6PM or so.

						Masataka Ohta
Newsgroups: comp.graphics
From: C.A.Teuben@rc.rug.nl (Chris Teuben)
Subject: 3D-Studio v2 and ET/4000
Keywords: 3D-Studio, Tseng, ET/4000
Organization: University of Groningen
Date: Thu, 13 Aug 1992 19:24:22 GMT

Hello, 

Can someone tell me how to get 3D-Studio to work with an ET/4000?
I am trying to make the VESA interface work.
Do I need a special VESA (or ADI) driver for this to work?
What values should I give to the environment variables?

Thanks in advance!
Newsgroups: comp.graphics
From: wayne@schaefer.math.wisc.edu (Rick Wayne)
Subject: Re: Autodesk Animator C library?
Reply-To: wayne@wisplan.uwex.edu (Rick Wayne)
Organization: lakeshore graphics
Date: Sat, 15 Aug 92 16:04:10 GMT


we have exactly what you're looking for.  if you have access to 
compuserve, join the autodesk forum (go ASOFT) and download FLILIB.ZIP.

if you don't have access to compuserve, mail me and i'll see 
about getting the library to an ftp archive somewhere.

rick
Newsgroups: comp.graphics
From: dws@dbsoft.menlo.cadre.com (David W. Smith)
Newsgroups: comp.graphics
Subject: Re: (04aug92) comp.graphics Frequently Asked Questions (FAQ)
Date: 12 Aug 92 16:35:22 GMT
Article-I.D.: dbsoft.1992Aug12.163522.12768
Organization: Cadre Technologies Inc., Menlo Park Operation

In article <5683@m1.cs.man.ac.uk> lilleyc@cs.man.ac.uk (Chris Lilley) raises
a couple of good points about FAQs and problems faced by comp.graphics.
In talking about the flow of non-graphics questions into the group, he
writes:

>                                                   Similarly, most
>of the postings about 'how do I display a GIF' are not because the
>poster wants to back end their latest graphics program, but because
>they want to display a scanned photo taken off the net. Most likely of
>a military airplane, or semi naked women. Nothing much to do with
>computer graphics.
>
>Because the title of this group does not explicitly state 'computer graphics',
>many who want such tools post here on the assumption that this is what
>the group is for.

Even if the group's title were explicit, we'd still see a steady stream of
questions about GIF and friends, because (a) that's what a lot of people are
very interested in, (b) many are having problems, and (c) they're going
right to where they think they can get answers.  Barring a comp.gif group,
a lot of those folks end up here.  Thinking back over subject threads of
the past few months, a healthy percentage (aside from the rather unpleasant
and unfortute FAQ wars of late) seem to be of the "how to I convert GIF to
<xyz>?"  I don't believe that sections 7 and 8 of the current FAQ are yet
up to helping these people out.

There's an opportunity for someone here who has the time and interest to
make a positive contribution to this group by collecting the information
about GIF and friends, and either forwarding it to the current FAQ keeper
or starting up a separate mini-FAQ dedicated to GIF and related issues.
As Chris says, this doesn't have much to do with computer graphics, but
it is in keeping with the goal of a FAQ.

-- 
Dave Smith, Cadre Technologies Inc. - Database Tools Division
4500 Bohannon Drive, Suite 150, Menlo Park, CA  94025
Newsgroups: comp.graphics,comp.parallel
From: stuebing@unipas.fmi.uni-passau.de (Andreas Stuebinger)
Subject: Nice drawing of petri nets
Apparently-To: comp-parallel@unido.informatik.uni-dortmund.de
Organization: University of Passau, Germany
Date: Thu, 20 Aug 1992 06:41:39 GMT

Hello,

(I already sent this to comp.sources.wanted, but got no reply, so I'm
trying comp.parallel and comp.graphics now.)

I'm looking for algorithms (best in C, Pascal, ...) to draw a given 
petri net (C/E or P/T) "nice", i.e. input is a list of nodes and edges. 
Output can be a nice drawing of the given net or calculated coordinates 
of all nodes. 

I'm interested in other petri net tools (i.e. analysis, editor, ...), too.

Does anybody has such algorithms and would you please respond by email.
Thanks a lot for any kind of help

Andreas
******************************************************************************
*  Andreas Stuebinger					Universitaet Passau  *
*  stuebing@trillian.fmi.uni-passau.de                   Tel.: 0851-509-779  *
******************************************************************************


Newsgroups: comp.graphics
From: gary@nexnix.demon.co.uk (Gary Howland)
Subject: wolf 3D
Distribution: world
Organization: nexnix
Date: Sun, 16 Aug 1992 20:16:38 +0000

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?
Newsgroups: comp.graphics,comp.graphics.visualization
From: wiebe@unity.ncsu.edu (Eric Wiebe)
Subject: Re: materials on visualization
Organization: North Carolina State University Project Unity
Date: Thu, 20 Aug 1992 19:41:30 GMT

In article <1992Aug19.161156.22642@ccsun.strath.ac.uk>, ccav38@ccsun.strath.ac.uk ("I.Ballouz") writes:
|> Hello,
|> Do you know of any recent articles or books on computer visualization for architects?
|> I'd be grateful if you let me know about any publications you came across.
|> Thank you.  
|> -- 
|> ********************************************************************************* IBRAHIM BALLOUZ           **           DEPARTMENT OF ARCHITECTURE            ** ccav38@uk.ac.strath.ccsun ** STRATHCLYDE UNIVERSITY  GLASGOW  SCOTLAND  U.K. ****************|> 
|> *****************************************************************

There was an excellent book that came out of the Harvard Graduate School of Design in '91 called
Digital Design Media: A handbook for architects and design professionals by WJ Mitchell
and M McCullough. I primarily teach visualization to engineers and some industrial designers
but my sense is that this a good book for architects. It has a very accessable intro to 
computer and computer visualization theory followed by sections on 1, 2, and 3-D media.
The book closes with a section on animation and hypermedia. 

Eric Wiebe
Graphic Communications Program
North Carolina State University
eric_wiebe@ncsu.edu
From: don@cc.gatech.edu (Don Allison)
Newsgroups: comp.graphics
Subject: Re: The Worst of Siggraph (Was 'The Best of Siggraph')
Date: 13 Aug 92 02:57:35 GMT
Organization: Georgia Institute of Technology

Rick Speer writes:
>> The growing suspicions are not helped by things
>>    like Pat Hanrahan, a session chair, refusing to answer a question from
>>    the floor about how and why a particular paper was accepted...
then later,
>This is not entirely accurate. Pat himself did not refuse to answer
>a question, as stated. Instead, he did not allow the second question
>from the floor for a particular paper to be answered, on the grounds
>of a lack of time.

Was this the session where the second question asked was "what was new in
the work presented and how it differed from some work presented in the 88
conference?" and the answer was to talk to the authors after the session
and to go on to the next paper?  If so, as I recall, the audience was not
very happy with the response, especially since the comment at the end of
the paper was that there was time for a couple of questions since they
were on time or even early.

And on a different subject...did anyone besides me think the bus service
could have been better?  I remember waiting for a route 2 bus while 3
route 3 buses ran their route.  When the route 2 bus finally showed up and
got us to the hotel, there were 2 other route 2 buses just parked there
not taking passengers...it seemed that as one bus would pull in, they
would send another bus out, but that two buses were always sitting parked
at the Hyatt...and they weren't conserving energy, because they all were
running to keep their air conditioners on!  Was this some union thing
mandating 45 minute rest breaks for every 15 minutes driving? :-)

Don Allison
don@cc.gatech.edu
					
					-Don Allison (don@cc.gatech.edu)
Newsgroups: comp.graphics,bionet.software,bionet.plants
From: dangold1@iastate.edu (Daniel M Goldman)
Subject: Graphing, plotting, drawing software
Organization: Iowa State University, Ames IA
Date: Wed, 12 Aug 1992 18:55:39 GMT

We are heavy users of CoHort Software, which includes CoStat,
CoPlot and CoDraw, and would like to exchange ideas with others
who use this software and related programs.  We find that this
software has many features found in more expensive software
(3-D, presentation quality, overlays, regression, calculations,
rotation, scaling, etc.) and is easier to learn and use. Right
now we are using output from MAPMAKER to draw our genetic locus
maps (to scale) using this software instead of doing it by hand
with grids, which was the *old* way.  There are probably others
who have done similar things, and we would like to learn more
about these.  We are primarily interested in plant breeding,
but are involved in many kinds of lab, greenhouse and field
plot research of crop plants.  Thanks -DmG
From: dangold1@iastate.edu (Daniel M Goldman)
Subject: Re: Is there a mathematical relationship RGB -> wavelength?
Organization: Iowa State University, Ames IA
Date: Thu, 13 Aug 1992 13:07:55 GMT

In <92225.171906POLOWINJ@QUCDN.QueensU.CA> Joel Polowin <POLOWINJ@QUCDN.QueensU.CA> writes:

> > For curiosity's sake, I was wondering if it is possible to take a set
> > of RGB color fractions and come up with an approximate wavelength of
> > the observed mixture.  I suppose this could be done by just
> > interpolating between some known values in a table, but I would like
> > to know if there is a way to actually calculate the wavelength.  Of
> > course, I'd also be interested in a formula to compute the RGB
> > fractions for a given wavelength.

    In dealing with real light, we run into metamers, colors which look
    the same under one light source, but look like different colors
    under a different light source.  Colors expressed as wavelength,
    I believe, are the most specific.  However, if memory serves, you
    can have a hue-chroma-brightness specification which can be 
    matched by more than one "wavelength" specified color, that is,
    they might be metamers.  I don't really know if this has anything
    to do with computer color graphics, but if it does, beware. -DmG
From: delp@casbah.acns.nwu.edu (Scott Delp)
Newsgroups: comp.graphics
Subject: Public domain Software for intersetion of an object wiht plane
Keywords: intersection, centroid
Date: 13 Aug 92 15:47:02 GMT
Followup-To: komattu@uhura.smpp.nwu.edu
Distribution: comp.graphics
Organization: Northwestern University, Evanston Illinois.

I have two parts to my posting.

a) I am interested in finding a public domain software which will let me do
   an intersection between an object(made of vertices and polygons) and a
   a plane.
	The intersection will give me a plane and I would like to find the
  vertices of that plane.

b) the above vertices will form an irregular shaped polygon. Is there a
   public domain software to find the CENTER of this polygon.

If someone knows about these software please send me the information by:

	email:	"komattu@uhura.smpp.nwu.edu"

I promise to summarize the results and put on the network.

Thanking all of you in advance

Abraham V Komattu
Rehab Inst of Chicago
Newsgroups: comp.graphics
From: neal@jpl-devvax.jpl.nasa.gov (Neal Wolff)
Subject: Complex Questions on Graphic formats
Keywords: VAN files, PBM files
Organization: Jet Propulsion Laboratory (NASA)
Date: Fri, 21 Aug 1992 19:13:22 GMT

To anyone who can help....

	I have two challenging questions about graphics files and converters/viewers.  Here they are:

1.	Does anyone know of a .VAN to .FLI converter out there in FTP Land?  I found a beautiful .FLI of simulated flight through a fractal generated canyon.  My friend pointed out the fact that the canyon scene looks identical to one created by VistaPro.  But VistaPro only creates animation files in the .VAN format.  I would really like to find a conversion program (either FTP or buy) that can help me produce some spectacular .FLI's that I could give out to people.  Please E-Mail me at the address below.

2.	Does anyone know about a graphic file format called .PBM?  I found several files with this suffix and I don't know how to View them.  I work with PC's but if a UNIX version of a conversion program is availible I would still like to know.  I would like to transfer them into another format such as GIF or JPEG.  Please E-Mail me at the address below with any info.


	Thank you all for you answers and info.  If you don't want to E-Mail me, you can also post you ideas/answers here and I will check up on them.  Thanks alot.

==============================================================================
			UNIX is like sex.....
	     If you've tried it, you can't live with out it ...
	     If you haven't tried it,  you don't know what all
                the fuss is about.
					- Anonymous

Neal "Wolfman" Wolff
E-Mail:  neal@ufo.jpl.nasa.gov
==============================================================================

Newsgroups: comp.graphics
From: d3g450@tnp_op.pnl.gov (MC Pottier)
Newsgroups: comp.graphics
Subject: HELP! XWD -> GIF/PICT
Date: 12 Aug 92 17:25:14 GMT
Article-I.D.: oracle.1992Aug12.172514.24659
Organization: Battelle Pacific Northwest Labs, Richland, WA
Originator: d3g450@tnp_op.pnl.gov


Howdy...

   Sorry if this is an old thread...

   I need to convert XWD images from a Sun sparcstation to either a PICT or
GIF format. Does anyone know of a RELIABLE way of doing this? (utilities,
programs, applications). I've tried the ppm utilities, (xwdtoppm ppmtogif) and
they don't work. I end up with black bitmaps...

   Thanks for any info on this subject...

-Marc

-----------------------------------------  *************** *** ***************
Marc Pottier                                 ************* **  *************
Battelle Pacific Northwest Laboratories            *******************
                                                      *************
User Interface Design                                     *****
                                                         *******
mc_pottier@ccmail.pnl.gov                                  ***
------------------------------------------------------------------------------
From: Chris_F_Chiesa@cup.portal.com
Newsgroups: comp.graphics
Subject: Re: SigGraph, Chicago, and Unions
Date: Thu, 20 Aug 92 18:14:51 PDT
Organization: The Portal System (TM)
  <BsyK9q.18s.2@cs.cmu.edu> <1992Aug14.154616.7014@engage.pko.dec.com>

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.  

I have no sympathy at all for some lazy butt who gets all irate or feels
he's been "done wrong" if someone asks him to do what he's being PAID for!
The whole idea is that when you go to work in the morning you're supposed to
put in a full day's WORK, NOT a half-day's work plus a half-day's coffee-
drinking!  Sure, if a lull occurs and you can afford to take a coffee break
without shirking your responsibilities, fine, do it -- but remember that this
is a LUXURY, not a RIGHT.  My personal objection to union intervention in the
workplace is that all too often the unions encourage and inflate this idea 
of "entitlement to coffee breaks," a la the "45 minute rest breaks for 
every 15 minutes of driving" someone here mentioned in connection with 
Siggraph buses, when exactly the OPPOSITE is appropriate.

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 also don't listen to a 
radio or tape player, and strongly disapprove both of those who DO, and of 
the deliberate encouragement of such distraction by radio stations which run
promotions specifically targeted to those "listening to (us) at work."  I
wouldn't want my car worked on by a mechanic who had a radio blasting away 
while he was working on my car -- I can't believe he'd actually be paying
full attention to his work on the car!)  I would vote down any proposal to
bring unions into MY workplace, specifically because I feel they would greatly
interfere with productivity -- mine and others'!

That's my two cents' worth; forgive me for posting it in an only very mar-
ginally relevant place...
 
ObGraphics:  I've written a Mandelbrot Set display program for the Casio
7000 hand-held, graphics-display-capable calculator.  Requests to the
e-mail address below!

Chris Chiesa
   Chris_F_Chiesa@cup.portal.com
Newsgroups: comp.graphics