HDTenEightyP/NetNews huggingface dataset:
From: d0np@elara.sun.csd.unb.ca (Godzilla)
Subject: Re: Trident 8900C
Keywords: Leading Edge, Trident, 8900C, graphics card, accelerator
Organization: University of New Brunswick
Date: Thu, 5 Nov 1992 23:26:00 GMT

In article <gibbsdl.35.720976276@ornl.gov>, gibbsdl@ornl.gov (David L. Gibbs) writes:
|> I just bought one of Leading Edge's new Mini Tower computers.  It's a 
|> fairly nice machine:  486DX/33, 210M drive, 4M RAM, FLASH BIOS, 64K (to 
|> 256K), CPU card (claims to be upgradable to Pentium).  The dealer told me 
|> that Leading Edge had been including ATI graphics cards in their machines, 
|> so I expected an ATI card in mine.  What I received was a Trident 8900C card 
|> with 1M RAM in a local bus slot.  I am not familar with Trident and the
|> docs are not very informative.  
|> 
|> Questions:
|> 	Is this card accelerated?  

No.

|> 
|> 	It's a regular ISA card, so will I get any benefit from the local 
|> 	bus slot?  
|>

Not sure.
 
|> 	There is no mention of what type local bus slot is in the 
|> 	machine.  Is there a way to tell if it's VESA or some other type?

Mine came with a software driver to stuff in the config.sys to get VESA
compatability.

|> ----------------------------------------------------------------------
|> David L. Gibbs                             Internet: gibbsdl@ornl.gov
|> Martin Marietta Energy Systems, Inc.         BITNET: gibbsdl@ornlstc
|> Data Systems Research and Development         Phone: (615)576-6885
|> 1099 Commerce Park                              FAX: (615)574-7624
|> Oak Ridge, TN 37830-7619
|> 

					Mike

d0np@jupiter.sun.csd.unb.ca
d0np@unb.ca
Newsgroups: comp.graphics
From: hamid@imada.ou.dk (Hamid Sarabi)
Subject: Bounding cylinder
Summary: find bounding cylinder for n points
Keywords: bounding cylinder
Organization: Dept. of Math. & Computer Science, Odense University, Denmark
Date: Wed, 11 Nov 1992 20:39:54 GMT

  Can anyone lead me to a library (PD or shareware) that will allow me to
  compute the bounding cylinder for n points (polyhedra)  in R^3.
  In particular each polyhera should be bounded by either spheres or cylinders.

          Thanking you in advance.
  ================================================================
  Hamid Sarabi
  Denmark-Odense University
  Email: hamid@imada.ou.dk
  ===============================================================


Newsgroups: comp.graphics
From: laviers@IRO.UMontreal.CA (Cocotte Minute)
Subject: Looking for T.Whitted's 1984 sample raytracing code
Organization: Universite de Montreal
Date: Sun, 8 Nov 1992 05:19:54 GMT

Hello,

     I would liked to find T.Whitted's 1984 source code
for his "Simple Ray Tracing" program published in 1984
in (I think) SIGGRAPH's course notes...

I have it on paper, and I have used it three years ago for the
basis of my raytracer... But I have lost the original code.

As this is to give to an undergraduate class in computer graphics
as an example program (short and sweet), I need the original
code. (possibly debugged?).

I could type it all by hand... but then I am lazy :) and it would take me
3 days (I'm a slow typer).

I hope someone out there has already done this and is willing to send me
a copy. He will (of course!) get all my gratitude!

Sebastien

--
_____________________________________________________________________________
|Sebastien Lavier [Calimero]    | Centre de recherche, Hopital du Sacre-Coeur  
|laviers@iro.umontreal.ca       | "The opinions expressed here are mine and  
|Universite de Montreal, Canada |   should also be yours!"               
Newsgroups: comp.graphics
From: seitz@cs.wisc.edu (Steve Seitz)
Subject: Re: Getting an outline from a bitmap
Organization: U of Wisconsin CS Dept
Date: Wed, 11 Nov 1992 21:15:14 GMT

In article <1drfrmINNkft@travis.csd.harris.com>, srp@travis.csd.harris.com ( Stephen Pietrowicz) writes:
|> I'd like to get some pointers for obtaining an outline from a bitmap, in
|> the form of a list of ordered points.  When I say "ordered" I mean if I 
|> took the points and connected the first to the second, the second to the
|> third, I would get the online of the object.  (As opposed to a "random" set
|> of points that didn't preserve that information).  Tips/hints/references
|> and or code would be greatly appreciated!
|> 

Unfortunately, this problem isn't nearly as simple as it sounds, especially when
there is noise and/or the "outline" isn't connected.  Reliably finding the points
on the outline is an unresolved problem in computer vision.  However, if it's
a closed contour that you're after, a good starting point would be:

M. Kass, A. Witkin and D. Terzopoulos, 'Snakes:  Active contour models', 
Intl. Journal of Computer Vision 1, 1988, 321-331.

and

D. Williams and M. Shah, 'A Fast Algorithm for Active Contours and Curvature
Estimation', Computer Vision Graphics Image Proc. 55, Jan 1992, 14-26
Newsgroups: comp.graphics,comp.os.os2.misc,comp.sys.ibm.pc.hardware
From: Brandon.Vanevery@launchpad.unc.edu (Brandon Vanevery)
Subject: 24-bit color board for OS/2 2.0 ?
Organization: University of North Carolina Extended Bulletin Board Service
Distribution: usa
Date: Mon, 9 Nov 1992 03:16:42 GMT


Can anyone recommend me a 24-bit color board for OS/2 2.0?  Do such things
even exist at this point?

If they don't, anyone know when they will?  Or when manufacturers of existing
boards will write OS/2 2.0 drivers?

Cost estimates would be nice; I'm expecting multiple $1000's for EISA or
MCA boards with TIGA chips, etc.

Thanks in advance,
Brandon Van Every
--
   The opinions expressed are not necessarily those of the University of
     North Carolina at Chapel Hill, the Campus Office for Information
        Technology, or the Experimental Bulletin Board Service.
           internet:  laUNChpad.unc.edu or 152.2.22.80
Newsgroups: comp.graphics.visualization
From: brandon@se.vanderbilt.edu (Brandon S. Dewberry)
Subject:  Red blood cell simulation/visualization - geometry question
Reply-To: brandon@se.vanderbilt.edu (Brandon S. Dewberry)
Organization: Vanderbilt University School of Engineering
Date: Mon, 9 Nov 1992 16:27:50 GMT

Hi,
I'm beginning a project which will simulate and visualize red blood cell
(RBC) passage in an arteriole and capillary.

I want to start out as simple as possible so the model will be 2D, the
RBC's and vessel walls will have no elastance.  Plasma flow rate will
vary with position but not with time (not pulsitile.)

The vessel model is a 2D channel which gets smaller, with subsequent
increasing plasma speed, until the channel only slightly wider than the
RBC diameter (represented as circles in flatland.)  
This is a pretty standard basis for more complex models.

RBC centers will be at points Xi, Yi.  The vessel walls will be either
b-spline curves (flexible) or functions F(x,y), whichever work the best.
At each major time slice the simulation will determine if any of the RBCs
have collided with each other or the vessel wall.  Momentum will be 
computed based on collisions as well as the plasma velocity.

Questions:

Determining RBC collisions is easy, though time consuming - an n^2
determination of distances between centers and comparison to RBC diameter.
     if( sqrt( (x1-x2)^2 + (y1-y2)^2) == rbc_diameter) then collision...
Is there a quicker way?

The more pressing question is what is the quickest way to determine collision
between RBC's and the capillary wall?
Finding the distance (as near as I can tell) involves iteratively searching for the
perpendicular which includes the RBC center, then finding the distance from its
intersection to the RBC center.  For all the RBCs.
Is there a quicker way?
Does 'Graphics Gems' include an algorithm?

A cohort suggests finding a map of all distances in the vascular space before
beginning the simulation.  This would be quickest, but limits interaction with
the simulation.

Any suggestions?

Brandon
-- 
Brandon S. Dewberry               Biomedical Engineering Department 
brandon@vuse.vanderbilt.edu       Vanderbilt University
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: Recording animations
Date: 12 Nov 92 19:08:35 GMT

On 11 Nov 92 14:26:30 GMT <spl@EDU.UCSD.ALEX> said:
>In article <9211110425.AA25602@psi.rutgers.edu> CDO@IB.RL.AC.UK (C D Osland)
> writes:
>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?'
>... lines (with which I agree!) deleted
>--
>Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@szechuan.ucsd.edu

I meant 'perfect' (and put in quotes) in the sense that the image is
exactly what it should be according to the CCIR-601 manual.  We actually
write to it in YUV over the parallel digital interface (a YUV
framestore in the computer mirrors what's in the RGB framestore).
The quotes were a short-hand for 'at least as good as an 8-bit
video resolution picture can be'; also an ironic comment on
Philips' CD line 'Perfect Music - for ever'.

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.

I thought the non-square pixels were going to be a problem, but
most people just don't notice.  This experience came from inadvertently
running programs I had forgotten to modify: unless the picture was
actually clipped, no-one complained.  It appears that no-one
*expects* a circle to be circular on a TV, nor to be centred!

Chris Osland
Atlas Video Facility
Rutherford Appleton Laboratory, UK
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: Recording animations
Date: 13 Nov 92 22:00:05 GMT

On 13 Nov 92 08:56:09 GMT <andreas@DE.UNI-STUTTGART.RUS.AWSTAR> said:
>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.
>--
> Andreas Wierse              | Institute for Computerapplications II

It's caused by the fact that YUV encodes the Y all pixels but U and V
(I and Q in USA) for the even pixels along a line!  This, together
with interlace, causes the problem.  It can be improved by very careful
anti-alias software.

Chris
Newsgroups: comp.graphics.visualization
From: 209567906@cats.ucis.vill.edu (Dorkmiester)
Subject: AUTOSHADE for SunSparc
News-Software: VAX/VMS VNEWS 1.4-b1  
Organization: Villanova University
Date: Mon, 9 Nov 1992 00:01:00 GMT

Keywords: 

  Help!!!,
	Currently I am involved in a Senior project here at school.  The 
project involves creating a drawing using AUTOCAD version 11.  Then we are to
render the drawing.  As I understand it we need to use the AUTOSHADE program 
which we have as an option to autocad.  I am able to add the properties, camera
, and lights.  But my primary question is how run AUTOSHADE.  It seems that 
AUTOSHADE runs external to AUTOCAD also.  Is this true?  And if so why 
would I get an error similar to unable to create page, so about being so 
general but I can 't remember the exact wording of the error.  It seems to 
be some sort of page creation error.  I try this when I am in the shade2 
directory.  I have tried the necessary commands at both the typical operating 
prompt and in OPENWINDOWS version 3.1.  We are running in a c shell 
environment.  Also when I define environment variables relevant to Autoshade
and Renderman they exist when an env requested, but Autocad doesn't seem
to locate the necessary files. The first question is by far the most important.
I can counteract the latter problem by copying the necessary files to my 
account, although this is a particularily stupid way to solve the problem,
it does work.  I thank anybody who may have any suggestions in advance.

					Thanks,
					B.D.W
From: skr@castle.ed.ac.uk (S Rushton)
Newsgroups: comp.graphics.visualization
Subject: 3d databases
Keywords: 3D, databases
Date: 11 Nov 92 12:33:30 GMT
Organization: Edinburgh University

i've been following the discussion of setting up a ftp site
of 3d databases and choice of appropriate file formats
with interest.

people have been suggesting that convertors between different
formats should be provided.  for me using a phigs based system
that has no functions for reading any database abc or xyz, what 
i'd like to see is alongside database jjj in format xyz, code for 
reading database xyz provided - this way the argument is not 
about database formats but rather code formats C/fortran/.. 
and PHIGS/GL/.. 

anybody think this is a good idea?  anybody got any good
databases and C/PHIGS code for reading them they want to 
let me have?

simon


simon rushton
'perception & action in VR' project
psychology, edinburgh university.
Newsgroups: comp.graphics.visualization
From: yi@fife.ecn.purdue.edu (Juneho Yi)
Subject: Re: Recording animations
Organization: Purdue University Engineering Computer Network
Date: 10 Nov 92 15:23:19 GMT

CDO@IB.RL.AC.UK (C D Osland) writes:

>On 4 Nov 92 07:30:34 GMT <idpt249@tw.net.seed.tpts1> said:
>>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.

>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

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

Thank you.
-- yi@ecn.purdue.edu
Newsgroups: comp.graphics.visualization
From: rfarias@lascar.puc.cl (Ruben Farias IIC)
Subject: HELP: TIF Format!
Organization: Pontificia Universidad Catolica de Chile
X-Newsreader: Tin 1.1 PL5
Date: Fri, 13 Nov 1992 14:55:02 GMT

Hello all:

     I have an image for PC's. This one has an *.TIF format and I wanna
see it in Macintosh. 
     I know that I can do it, but I dont know how to do it.
     If someone knows something that can help ma, please tell it to me,
by E-mail.

Thanks in advance.
 
Ruben Farias
rfarias@lascar.puc.cl
From: taylorf@sweetpea.jsc.nasa.gov (Frank S. Taylor IV 283-4278)
Newsgroups: comp.graphics.visualization
Subject: Re: Looking for a fast tool to display SGI-Images - Need Infos !
Date: 5 Nov 92 13:44:31 GMT
Organization: McDonnell Douglas Space Systems Company


 On 2 Nov 92 08:54:48 GMT <wnkretz@DE.UNI-STUTTGART.ENERGIETECHNIK.IKESG1> said:
>
>
>   Hey,
>
>   we are looking for a software tool (public domain), which allows very
>   fast reading from disk and also very fast displaying on screen.
>   We use Silicon Graphics machines, such as 4D 35/TG. For example,
>   an algorithm which stores the RGB-images in small files and allows
>   nevertheless to display this stored images on the screen. If you
>   know any informations about such a tool, please mail it to me.
>
>   Thanks for your efforts,
>
>      Oliver
-- 
There are some tools available in the Developer's Toolbox CD-ROM from SGI
which allow you to create movies from RGB images.  I've seen two minute
clips of videos played back with the utility (with audio too!).  The tool
has been improved with a better user interface and released with the IRIX
4.0.5F release under the Digital Mosaic package.  You should contact
your SGI sales person about Digital Mosaic, or the Developer's Toolbox (if
you qualify as a registered developer).

----------------------------------------------------------------------------
Frank S. Taylor IV  -  McDonnell Douglas Space Systems Company
16055 Space Center Blvd., Houston, Tx  77062
(713) 283-4278 (Voice)  ||  (713) 283-4020 (Fax)
taylorf@sweetpea.jsc.nasa.gov
----------------------------------------------------------------------------
From: hollasch@kpc.com (Steve Hollasch)
Subject: Re: 3d displays
Summary: Levels of display
Organization: Kubota Pacific Computer, Inc.
Date: Fri, 6 Nov 1992 18:51:04 GMT

Hollasch:
>    Seriously, though, what sort of scheme are you thinking of?  Polarized
> glasses 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.

CDO@IB.RL.AC.UK (C D Osland) writes:
| 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.

    Well, here's a range of display types:

        1)  2D Image
        2)  Stereo View
        3)  Hologram
        4)  3D Image

    There are other types (lower level, higher level, in between), but these
are the main ones.

    A 2D display is just a regular picture - it's as if you were looking
through a window with one eye.

    A stereo image is better because it provides depth information in the
"natural" way; through paralax to provide visual disparity.  Your virtual
head is still locked in a vise though; there's only one possible view.

    A hologram is an improvement on this.  You get paralax as in stereo
display, but your view is a bit more free to change.  It's as if you were
looking through a window, but without your head in a vise.  You can move
your head around and see behind things, or under things, but you are still
constrained to look through the virtual viewport/window.

    A 3D display is the next extension.  It's analogous to a sculpture on
a pedestal.  You can walk around it, look at the top, any side view, and if
it's free-standing, underneath it.  Even, perhaps inside it, if the
underlying ``magic'' allows this.

    Now, perhaps the original poster didn't mean this at all, but my idea of
a 3D image is _very_ different from a stereo view.  Hope this clears up some
confusion.

______________________________________________________________________________
Steve Hollasch                                   Kubota Pacific Computer, Inc.
hollasch@kpc.com                                 Santa Clara, California
Newsgroups: comp.graphics.visualization
From: eugene@amelia.nas.nasa.gov (Eugene N. Miya)
Subject: [l/m 8/10/1992] Shell2 -- the outrigger	(2/4) c.g.v.FAQ2
Followup-To: poster
Organization: NAS Program, NASA Ames Research Center, Moffett Field, CA
Date: Sun, 8 Nov 92 12:45:12 GMT
Reply-To: eugene@amelia.nas.nasa.gov (Eugene N. Miya)

#Disabled
Archive-name: comp.viz.faq

	"Feed me."  -- Audrey II, the Plant in "The Little Shop of Horrors."

Contents
========

Intro
-----
What is visualization?
----------------------
Systems
-------
Issue/problems
--------------
Netiquette
----------
References
----------
================================

Intro
-----

The quality of this FAQ is directly proportional to the information
mailed by participants (that's you) to the maintainer (me, Amelia).
You don't like it?  Blame the rest of the posters and readers.
I don't have 100% time to maintain this.  We are starting from scratch.
If an address or phone is out of date?  Blame the group.  I'm just a dumb
computer posting as I am told.

The structure of this FAQ is currently a twice monthly post, with two
weekly outriggers pointing to the Long version.  We will see how well
this works (empirical science).

You should not have to see this file all the time.  Don't bother saving it
unless you have a flakey net connection.   Grab the most recent revision
off the net.  The Subject: line is designed to fit within the 24-char limit
of most Killfile systems.  Learn about Killfiles.  If you have something
against FAQ files, the regular expression /.*FAQ$/ will Kill All My Children
and me.  We suggest that you learn how to use news and how news works
before complaining.  See news.annouce.newusers.
This post is like a lighthouse or a fog horn.  Learn how to use it.

This is the outrigger, the main FAQ will be posted next week.
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: Texture Paging of terrain images
Date: 10 Nov 92 20:57:27 GMT

On 10 Nov 92 18:37:10 GMT <lau@COM.SRI.AI.SUNSET> said:
> I'm working on a project where we will be texturing a large
>area with many aerial images.
...lines deleted
>created and made available to the renderer. We will need to
>develop a cache mechanism of some sort for the images.
>
>My question is if anyone out there has successfully done this
>at a rate of at least 30 frames a second, and if anyone can point me
>to any literature which describes a similar scheme. Any help
>at all or advice would be most appreciated. Thanks.
>

Evans & Sutherland, to name but one (sic!), do just this in their
flight simulators.  Whether they've documented these tricks of the
trade, I don't know.

Chris Osland
Rutherford Appleton Laboratory, UK
Newsgroups: comp.graphics.visualization,comp.lang.visual
From: jonathan@rahul.net (Jonathan Heiliger)
Subject: Re: Looking for Scientific/Visualization applications generator / 
Organization: a2i network
Date: Tue, 10 Nov 1992 15:22:21 GMT

In article <1992Nov8.173147.10328@wisipc.weizmann.ac.il> 


>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.

   Silicon Graphics markets two applications that might be right for you.  One 
is IRIS Inventor and the other is IRIS Explorer.  IRIS Explorer is a bit more 
advanced, but I believe it is more centered around a programmers intface. .  
The only problem is that I believe these two programs only run on an 
SGI workstation, not any old UNIX box.
 

 
-- 
Jonathan Heiliger ........ Electric Power Research Institute
Internet: -/- jonathan@rahul.net -/- flix@mecca.epri.com -/-
Telephone <*> (415) 855-2888