HDTenEightyP/NetNews huggingface dataset:
Newsgroups: comp.graphics.visualization
Subject: Telecommuters, Remote Workers
From: 9138827a@levels.unisa.edu.au
Date: 2 Nov 92 17:25:48 +1030
Organization: University of South Australia

This item has been cross-posted to comp.graphics
================================================

I am undertaking postgraduate study at the School of Library and
Information Management, University of South Australia, Adelaide, on
the particular information needs of telecommuters - those who perform
job-related work at a site away from an organisation and communicate
electronically rather than commuting physically.
 
I would be very interested in, and would greatly appreciate a response
from those who are telecommuters, to the following questions. If you
are not a telecommuter but know of others who are it would be
appreciated if you could pass this on to them:
 
 
Q1      Does the organisation to which you telecommute provide any
        library and information services which are accessible to you
        online? (eg catalogs, reference assistance, databases, literature
        searches, document delivery services, organisation information
        such as daily bulletins and administrative gazettes.)
 
        If yes:
 
        (a) What services are provided?
        (b) How useful are these services to you?
 
Q2      (a)     What is the nature of the organisation to which you
                telecommute?
 
        (b)     If you sometimes commute physically to your organisation,
                how frequently do you do this?
 
Q3      What are the particular information needs that you have as a
        telecommuter?
 
Q4      What basic information services do you consider should be
        provided by an organisation for its telecommuters? (see Q5 for
        additional and desirable services)
 
Q5      What additional information services would you perceive as being
        highly desirable for an organisation to provide for its
        telecommuters?
 
Q6      Are there any further comments you wish to make regarding the
        information needs of telecommuters?
 
Q7      Would you like a summary of the results of this survey E-mailed
        to you?
 
Respondents can be assured that individuals and organisations will not
be identified in any report or summary of this survey.
 
Please E-mail your response to my Internet address:
 
9138827a@ntx.city.unisa.edu.au
 
Thank you for your cooperation
 
Bronwen Strong
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: Recording animations
Date: 5 Nov 92 08:29:40 GMT

On 4 Nov 92 16:45:05 GMT <phillips@AU.OZ.UWA.EE.SWANEE> said:
>I have heard mutterings about cheaper devices that will record (say) four
>frames at once instead of one.  Does anyone have any info on these?
>Even my humble c64 will fit four frames of the most memory intensive
>video mode it has...
>
>Christopher.

The best Hi8 camcorders will record 4 or 8 frames at a time and so
are excellent for time-lapse photography.  I think your problem
would be setting the workstation's sequence off at the right time -
you aren't going to have any pulse from the camcorder to tell the
workstation when it actually goes into RECORD (this will be a long
time - in video terms - after you ask it to.  You could try and find out by
experiment, but I would not expect the mechanics of a camcorder to
be sufficiently repeatable for this to work.  In addition, you need
to 'change frame' on the workstation between frames on the recorder -
again you're missing any sync information that would allow you to get
this right.

I haven't seen any results of time-lapse on Hi8 but reviews I saw of
it were complimentary.

Chris Osland
Atlas Video Facility, Rutherford Appleton Lab, Oxfordshire, UK
Newsgroups: comp.graphics.visualization
From: andreas@awstar.rus.uni-stuttgart.de (Andreas Wierse)
Subject: Re: Recording animations
Organization: Visualization Group Comp.Center (RUS) U of Stuttgart, FRG
Date: Fri, 13 Nov 1992 08:56:09 GMT

In article <9211122319.AA07871@psi.rutgers.edu> CDO@IB.RL.AC.UK (C D Osland) writes:
>Certainly YUV creates odd effects with single pixels that are
>of significantly different colour to their background - their colours
>twinkle like coloured stars.  This is, in general, only visible with
>still frames.
>

Correct me if I'm wrong, but couldn't the twinkling be caused by the
interlacing of the video display? So a single pixel would only appear
on every second field, i.e. if the pixel is on an even line it would
only appear on the field that displays the even lines. Since two fields
make a frame this would lead to a blink rate of 25 Hz (with PAL, with
NTSC it would be 30 Hz). In that case it wouldn't have to do anything
with YUV.

This effect is even worse if You display horizontal one pixel wide
lines. Then the whole line will flicker at a rate of 25 HZ (30 Hz).

Maybe I didn't understand completely what You mean (it's not Your fault
in that case :-). Could then someone explain the effect to me in more
detail, perhaps in an e-mail.

>Chris Osland
>Atlas Video Facility
>Rutherford Appleton Laboratory, UK


-- 
 Andreas Wierse              | Institute for Computerapplications II
                             | Dep. Computersimulation and Visualization
 wierse@rus.uni-stuttgart.de | Computer Center University of Stuttgart
 Tel.: ++49-711-685-5796     | Allmandring 30
 Fax:  ++49-711-682357       | D-7000 Stuttgart 80     Germany
Newsgroups: comp.graphics.visualization
From: keane@eng.umd.edu (Christopher Matthews Keane)
Subject: Getting 256 shades of green on a 6-bit colour register
Date: Thu, 05 Nov 92 13:11:50 GMT
Organization: Project GLUE, University of Maryland, College Park

I hope this is the best place to post this......
I need to get 256 unique shades of green for some landform
visualization I am doing.  I am writing the program in 32-bit code for
MS-DOS but am restricted to the lousy 6-bit color registers on the
non-HICOLOR svga board I am using.  Therefore, I can only get 64
unique shades :-(.  Does anyone know of a decent algorithm or tip on
how to mix the red and blue registers to increase the number of unique
green shades.  If possible, to put these in a dark to light order....

A yellowing of the new greens is fine, but I want to try to avoid
bluing of them.  Thanks in advance for any help!
Cheers
Christopher Keane
keane@earthsun.umd.edu
From: zdxh0a@trc.amoco.com (Douglas Horn)
Newsgroups: comp.graphics.visualization
Subject: Re: Recording animations [SUMMARY]
Date: 5 Nov 92 18:37:59 GMT
Organization: Amoco Production Company, Tulsa Research
Originator: zdxh0a@gpss53


In article <1992Nov5.135159.23715@crl.dec.com>, hsu@crl.dec.com (William Hsu) writes:
> In article <1992Nov4.155727@trc.amoco.com>, zdxh0a@trc.amoco.com (Douglas Horn) writes:
> > 
> > Has anybody had any experience with the new Sony "animation recording" deck,
> > the EV0-9650?  I have the leaflet for it, and it sounds great for recording
> > animation.
> > 
> > Here's some of what the leaflet says:
> > 
> ...rest deleted...
> > 
> > Thanks,
> > Angus Cleveland
> > 
> > 
> > -- 
> > /*  Douglas Horn (zdxh0a@trc.amoco.com)     (918)660-3247             
> > 
> >     Helpful hints:   Stop programming before it is too late.  */
> 
> I believe there was a long thread on this topic in comp.graphics.animation just a few
> days ago (and may still be going on).
> 

I did get this out of comp.graphics.animation. 


> I take it that Angus is just using Doug's account.
> 
> 
> William


Opps...I pasted where I should have cut.

Angus and Doug are different people.

-- 
/*  Douglas Horn (zdxh0a@trc.amoco.com)     (918)660-3247             

    Helpful hints:   Stop programming before it is too late.  */
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: Recording animations
Date: 10 Nov 92 18:56:22 GMT

On 10 Nov 92 15:23:19 GMT <yi@edu.purdue.ecn.fife> said:
>CDO@IB.RL.AC.UK (C D Osland) writes:
>
>>On 4 Nov 92 07:30:34 GMT <idpt249@tw.net.seed.tpts1> said:
>
>>>My boss told me there might be a solution.  If there's a high-end VCR which
>>>can be set to record single frame at certain interval, say 3 seconds, then
>>>we can connect it to audio port and put pictures into frame buffer at that
>>>speed.  It seems that JVC has such products.  I haven't got any chance to
>>>try.  Is there anyone using this method to record animations?
>
>>I would be very surprised if a VHS editing recorder was any faster
>>(real pre-roll time) than a Betacam.  JVC do have edit recorders that
>>can be controlled by RS232, but that is a functional convenience,
>>not a speed-up!
>
>I would like to know the model of this JVC VCR.
>As a matter of fact, I want to edit a VCR tape by my Mac II ci.
>Do you know of anything like this with a nice software for Macintoch
>computer ? A low-end machine is fine with me.
>In addition, any idea of the price ?
>
>
>>>Neil Chou

In the UK the model number is JVC BR-S605E - quite possibly E is for
European.  The RS-232C interface is an optional plug-in board.
I don't have any note of price.  As a Unix/CMS/VMS person I tend to
write the few lines of C required - eg for our Abekas A60 - to
construct the command; I don't know how it would be organized on
a Mac - sorry.

Chris Osland
Atlas Video Facility
Rutherford Appleton Laboratory, UK
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: 3d displays
Date: 3 Nov 92 17:51:35 GMT

On 3 Nov 92 02:42:40 GMT <hollasch@COM.KPC> said:
>Joshua Eli Schachter <jsct+@andrew.cmu.edu> writes:
>| Has there been any work done with an unpolarized and polarized glasses (each
>| eye rotated 90 degrees that is)?
>
>    Most people find this excruciatingly painful, and it's very difficult to
>twist them back when you're done.
>
>    Seriously, though, what sort of scheme are you thinking of?  Polarized
>glassed and LCD shutter glasses have both been used for stereo display, but
>I've never heard of any attempts to use these for 3D displays.

I think I'm confused, Steve.  Accepting that there are some (very few)
3D displays (such as the image pumped through the air by a loudspeaker
that I mentioned last week, and 3D scanned plastic), I don't understand
the difference between stereo and 3D in your last sentence.

I saw superb stereo pictures via two slide projectors, each with
a polarizing filter and the audience wearing matching neutral polarizing
filters last year in Europe.  I have been assured that a similar
setup with video projectors has been tried and worked - I can't get
hold of a second projector to try it out - has anyone else?

Chris Osland
Rutherford Appleton Laboratory, UK
From: spl@alex.ucsd.edu (Steve Lamont)
Newsgroups: comp.graphics.visualization
Subject: Re: Recording animations
Date: 11 Nov 1992 14:26:30 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
NNTP-Posting-Host: alex.ucsd.edu

In article <9211110425.AA25602@psi.rutgers.edu> CDO@IB.RL.AC.UK (C D Osland) writes:
>The Abekas A60 is a video disk recorder; default storage is 750 frames
>(30 seconds) in PAL and <<I think>> 25 seconds in NTSC ... yes, I know
>that also makes 750 frames, but the frames are different sizes in
>kilobytes in the two systems.  Unlike the (optical) recorders
>mentioned below, quality is 'perfect' - unless you want 10 bit per
>pixel or HDTV spatial resolution.

I'm not sure what the word 'perfect' means here.  Certainly, the image
quality is better than just about anything else but 'perfect?'  A
point to note is that if you write a frame to the A60 in RGB mode and
read it right back out, you won't get the same as what you put in.  This is
because the pixels are encoded in a kind of "folded" encoding.  Things
are encoded in YUV format and the components are weighted.  The U and
V components are alternated when written to the device.  Pixels are
also not square but are taller than they are wide by a ratio of (I
believe) 1.1:1.

[All of this is from memory and from looking at a piece of code that I
had sitting around that translates from RGB to Abekas YUV].

A good device but not perfect.  Certainly beats the hell out of the
Sony LVR-5000A we have here for programability and ease of use.

							spl
-- 
Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@szechuan.ucsd.edu
UCSD Microscopy and Imaging Resource/UCSD Med School/La Jolla, CA 92093-0608
"Far out, man"
            - President George Bush, heard in a stump speech on NPR
Xref: sparky comp.graphics.visualization:1732 comp.lang.visual:173
Newsgroups: comp.graphics.visualization,comp.lang.visual
Subject: Looking for Scientific/Visualization applications generator / high level language
From: gilad@dvir.weizmann.ac.il (Gilad Goren)
Date: Sun, 8 Nov 1992 17:31:47 GMT
Organization: The Weizmann Institute of Science

Hi,
We are looking for an "applications generator" or high level language that will
enable us to generate code for scientific research (Linear systems, Numerical
solutions of equations, Interpolation and Approximation, Transforms etc.) and
visualization of the results (Image processing, plots and countours etc.).
Advanced Man-Machine I/F will be of great help. This software should run on
UNIX workstations.

				Thanks

				Gilad Goren
Newsgroups: comp.graphics.visualization
From: idpt249@tpts1.seed.net.tw
Subject: Re: Recording animations
Organization: Seednet Information Service Center
Date: Wed, 4 Nov 1992 07:30:34 GMT

About recording animations, I got few words to say.  We've been using betacam
for a while.  But gradually I cannot stand the low speed of pre-roll.  To 
record 30 frames take at least 5 minutes.  At this moment I have 3368 frames
to go, which means 4 days will be gone.
My boss told me there might be a solution.  If there's a high-end VCR which
can be set to record single frame at certain interval, say 3 seconds, then
we can connect it to audio port and put pictures into frame buffer at that
speed.  It seems that JVC has such products.  I haven't got any chance to
try.  Is there anyone using this method to record animations? 
Sorry I don't quote previous opinions because my system is limited.
Neil Chou
Sinotech Engineering Consultants, Inc. TAIWAN
idpt249@tpts1.seed.net.tw
Xref: sparky comp.graphics:11688 comp.graphics.animation:964
From: g.coulter@daresbury.ac.uk (Gary.C)
Newsgroups: comp.graphics,comp.graphics.animation
Subject: RayTracing GUI
Date: 10 Nov 92 16:06:11 GMT
Reply-To: g.coulter@daresbury.ac.uk
Organization: Daresbury Laboratory, UK

Hi Everyone

I am currently  thinking about writing a graphical  user  interface
front end for the  use with script  based raytracing  programs. Can
anyone out there tell me which of  these script based PD raytracers
provides  the best results. I  want to run the final code  on a DEC
station  running ULTRIX,  but I am  doing the development on  a SUN
SPARCstation. 

What would be great  would be the name of  a raytracer/s that  will
run on  the above platform, and also a FTP site where I can get the
source and some sample scripts. I have heard about something called
POV but i'm not up on raytracing outside the Amiga (I use Real3D).


Thanks for Any help.
From: weinga@i31s24.ira.uka.de (Tim Weingaertner)
Newsgroups: comp.graphics
Subject: Color quantization
Date: 11 Nov 1992 09:54:38 GMT
Organization: University of Karlsruhe, FRG
Distribution: world
NNTP-Posting-Host: i31s24.ira.uka.de


Hi,

I'm looking for some books, papers or algorithms about color quantization or
color dithering. Is there anyone who can tell me something about it?

Please post or e-mail directly.



Thank You.

Tim 
weinga@i31s24.ira.uka.de




From: joseluis@hpbbi4.BBN.HP.COM (#Jose-Luis-Ojer)
Date: Wed, 4 Nov 1992 17:48:21 GMT
Subject: Re: Need VAX/VMS POVRAY 1.0
Organization: Hewlett-Packard GmbH
Newsgroups: comp.graphics

Try to use the functions XHPFileToWindow and XHPWindowToFile
from the library Xhp11 (see man XHPFileToWindow).
Newsgroups: comp.graphics
From: dave@pacdata.com (David Ambrose)
Subject: Need help: Decomposing Complex polygons
Organization: Steppenwolf's Magic Theater
Date: Fri, 6 Nov 1992 00:16:02 GMT

	Does anyone have any ready referrences to algorithms for
decomposing complex (self intersecting) polygon sets into a set of simpler
polygons?  Ultimately,  I'd like to derive either triangles or
trapezoids from the original polygon.

	Thus far,  all the algorithms I've looked at deal only with
convex polygons.  Fine for ray-tracing,  but not good enough for our
application.

	E-mail and I will post a summary.

	Thanks in advance,
	Dave Ambrose


-- 
David Ambrose - Pacific Data Products           UUCP: uunet!pacdata!dave
619/597-3426 				    Internet: dave@pacdata.com
Play it cool,  play it cool,  fifty-fifty fire and ice -- Joni Mitchell
                Auto racing:  It's not just a sport,  it's an attitude.
Newsgroups: comp.graphics
From: arsalan@baron.nldn.albany.edu (Arsalan Saljoughy)
Subject: Graphics Software needed
Originator: arsalan@citation.nldn.albany.edu
Organization: National Lightning Detection Network
Distribution: suny
Date: Fri, 13 Nov 92 19:07:44 GMT


I have an interest in purchasingm a software capable of free hand dreawing in 
colors; painting for printout on a color printer for MSDOS.  If you can 
recoomend any, please respond directly to my email address.

I also would like to know if there are any bi/multilingual dictionaries 
(including Portoguese)  for MSDOS.  Would appreciate recommendations/comments.

thanks.

--arsalan@nldn.albany.edu
-- 



Newsgroups: comp.graphics
From: andreasa@dhhalden.no (ANDREAS ARFF)
Subject: Vesa information wanted
Organization: Ostfold College
Date: Fri, 13 Nov 1992 15:42:44 GMT

Hello Netters.

I was wondering if somebody had a bios map, complete with addresses and
address descriptions, for the vesa svga standard, or does vesa svga use the
same bios addresses as vga.

And I'am also wondering if the vesa standard is available at any anonymous
ftp site, which I belive would contain most of the bios information I want.

And to the last: do I have to care about the screenmemory-windows and/or the 
read/write flag, or can I access any pixel in any way(r/w), and using 
whatever operation my mind feels free to at any moment on this, any, pixel.
I've heard that this is the case for mode 0x105, but is it true for all 
available modes, or just 0x105?

Arff
"Also for the not religous confessor, there is a mystery of higher values,
who's birth mankind - to the last - builds upon. They are indisputible. And 
often disregarded. Seldom you hear them beeing prized, as seldom as you hear 
a seeing man prizeing what he sees." Per Lagerkvist, The Fist 
(Free translation from Swedish)
              --Andreas Arff  andreasa@dhhalden.no--
Newsgroups: comp.graphics
From: neil@yc.estec.esa.nl (Neil Dixon)
Subject: Porting Sun PHIGS programs using NURBS
Date: Tue, 10 Nov 92 18:31:12 GMT
Organization: ESTEC/YCV, Noordwijk, The Netherlands

Dear All,
    We currently have a large program that makes extensive use of NURBS
surfaces using Sun PHIGS.  Is there anyone out there who has any information 
on porting something like this to other platforms and/or PHIGS packages.
We've tried talking to the sales reps of most of the major workstation
providers, but none of them seem to have any ideas of the portability issues
involved.

Any information, tips, etc would be appreciated.

Regards,
	Neil Dixon.
		

P.S.  Please email replies back to me at the address below if possible
(although its not necessary)

Neil Dixon <neil@gec-erc.co.uk> 
European Gas Turbines
Engineering Research Centre
Cambridge Rd, Whetstone,
Leicester LE3 8LH
U.K.
Phone:	+44 533 750750 x3646



-- 
Neil Dixon <neil@yc.estec.nl> UUCP:...!mcvax!esatst!neil, BITNET: NDIXON@ESTEC
Thermal Control & Life Support Division (YC) 
European Space Research and Technology Centre (ESTEC),
Noordwijk, The Netherlands.
Newsgroups: comp.graphics
From: martin@cs.curtin.edu.au (Martin Dougiamas)
Subject: Re: What are Quad Trees?
Organization: Curtin University of Technology
Date: Thu, 12 Nov 1992 08:07:02 GMT

schultz@schultz.kgn.ibm.com (schultz) writes:
>There are a bunch of papers covering the properties of quadtrees.
>Also, octrees are the logical extension of quadtrees into 3D.

I actually wrote a simple but effective solids-modeller last year using 
linear octrees, which are a VERY space efficient way to represent volumes.
You can also encode quadtrees linearly.  Essentially, the linear encoding
reduces the tree to a sorted array of leaves.  There is no need for pointers.
I found that operations like merging octrees and calculating cross-sections
could be performed quite speedily.

Hidden line removal for graphical display was also eased by the fact that 
the tree is pre-sorted spatially, so you always know what's behind what.

Irene Gargantini wrote a lot of papers on this topic, starting in the early
eighties... 

>There is a lot of material on octrees.

Yes, there is.  Octrees are a nifty data structure for a lot of other
things besides graphics.

Martin
--
,--------------------------------------------------------------.      _ .
| All the deserts I could irrigate      Martin Dougiamas.      |   _r| Ll\
| All the poor I could emancipate    martin@cs.curtin.edu.au   |  |  |    \
| But that's not what interests me      Curtin University      |  \  |_   /
| I'm interested in apathy          Perth, Western Australia  -+-> x~  `-'
`=== This Is Serious, Mum ====================================='        V
Newsgroups: comp.graphics
Subject: Telecommuters, Remote Workers
From: 9138827a@levels.unisa.edu.au
Date: 2 Nov 92 17:22:21 +1030
Organization: University of South Australia

This item has been cross-posted to comp.graphics.visualization
==============================================================

I am undertaking postgraduate study at the School of Library and
Information Management, University of South Australia, Adelaide, on
the particular information needs of telecommuters - those who perform
job-related work at a site away from an organisation and communicate
electronically rather than commuting physically.
 
I would be very interested in, and would greatly appreciate a response
from those who are telecommuters, to the following questions. If you
are not a telecommuter but know of others who are it would be
appreciated if you could pass this on to them:
 
 
Q1      Does the organisation to which you telecommute provide any
        library and information services which are accessible to you
        online? (eg catalogs, reference assistance, databases, literature
        searches, document delivery services, organisation information
        such as daily bulletins and administrative gazettes.)
 
        If yes:
 
        (a) What services are provided?
        (b) How useful are these services to you?
 
Q2      (a)     What is the nature of the organisation to which you
                telecommute?
 
        (b)     If you sometimes commute physically to your organisation,
                how frequently do you do this?
 
Q3      What are the particular information needs that you have as a
        telecommuter?
 
Q4      What basic information services do you consider should be
        provided by an organisation for its telecommuters? (see Q5 for
        additional and desirable services)
 
Q5      What additional information services would you perceive as being
        highly desirable for an organisation to provide for its
        telecommuters?
 
Q6      Are there any further comments you wish to make regarding the
        information needs of telecommuters?
 
Q7      Would you like a summary of the results of this survey E-mailed
        to you?
 
Respondents can be assured that individuals and organisations will not
be identified in any report or summary of this survey.
 
Please E-mail your response to my Internet address:
 
9138827a@ntx.city.unisa.edu.au
 
Thank you for your cooperation
 
Bronwen Strong