HDTenEightyP/NetNews huggingface dataset:
From: dlee@oahu.cs.ucla.edu (David Lee)
Subject: Requicha Replies...
Organization: UCLA, Computer Science Department
Distribution: usa
Date: Fri, 8 Jan 93 19:27:13 GMT

Date: Fri, 8 Jan 93 10:39:29 PST
From: requicha@lipari.usc.edu (Aristides Requicha)
Subject: addresses

I still exist, now at USC. Tilove is still at GMRL: rtilove@gmr.com.
There is a lot of literature on fast ops on CSG. There is a paper by Jansen
in a relatively recent issue of TOG. John Woodwark, now editor for the
british CAD J. has written a number of papers on the subject. Etc
AR

>Subject: Newsgroups: comp.graphics,sci.engr
>
>From: rustcat@leland.Stanford.EDU (Vallury Prabhakar)
>Subject: Need help locating Dr. Tilove or Requicha
>Keywords: Requicha, Tilove, 
>Organization: CDR, Stanford University
>Date: Thu, 7 Jan 93 09:50:43 GMT
>
>Hello, 
>
>Recently I came across a paper titled "Efficient editing of 
>solid models exploiting structural and spatial locality"
>(Computer Aided Geometric Design, 1984) authored by 
>Robert Tilove, Aristides Requicha and Mark Hopkins.  I'm
>interested in finding out more about their techniques and
>latest results if any.  
>
>Does anyone on these newsgroups know where and how I might
>be able to locate any of the above three authors?  The paper
>says that Dr. Tilove is at the GM Labs in Warren, MI but 
>that was in 1984.  Could anyone confirm?
>
>The above paper deals with dual CSG/B-rep geometric modellers, 
>and outlines a method of (quickly) updating the B-rep when a 
>CSG-node is to be edited or replaced.  If anyone here has other
>references related to this topic, I'd like to hear from them 
>as well and discuss this problem.
>
>I'd appreciate responses via e-mail since I'm not a frequent
>user of rn.  
>
>Thanks in advance!
>
>-- Vallury Prabhakar
>-- rustcat@sunrise.stanford.edu
>-- [415] 725-0163
From: yaser@cs.umd.edu (Yaser Yacoob)
Newsgroups: comp.graphics.visualization
Subject: Request- Rendering 3D arrays
Date: 11 Jan 93 22:23:05 GMT
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742


 Is there any public domain software that runs on the SPARCs for displaying
objects represented in a 3D array of voxels. I am looking, too, for some 
ability to rotate the object etc.

Thanks

----------------------------------------------------------------
Yaser Yacoob
Department of Computer Science
University of Maryland
College Park, MD 20742
yaser@cs.umd.edu
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: SIGGRAPH to do online electronic publication
Date: 8 Jan 93 18:20:38 GMT

On 8 Jan 93 16:49:18 GMT <gritz@EDU.GWU.SEAS> said:
>>rsc@altair.csustan.edu (Steve Cunningham) writes:
>>
>>| and images will be provided in tiff format and possibly other formats.
>
>In reply, davidsen@crd.ge.com (bill davidsen) writes:
>
>>  This is a good example when GIF may be better than JPEG, and might
>>even be the optimal choice for this content.
>>...
>> While GIF is limited to 256 colors,
>>quantization and dithering can provide an acceptable (if not optimal)
>>image form 24 bit color, and would probably be a better compromise.
>
>Sorry, but I must very strongly take exception to this.
... GIF vs TIFF deleted
>Secondly (and most importantly), as far as anybody interested in this
>type of research is concerned, 256 colors are totally unacceptable, no
>matter how well they are quantized and dithered.  Anything less than
>24 bits isn't worth the paper it's printed on.  (How's that for mixing
>of metaphors?)

I agree about quantization to 256 colours being unacceptable but '<24
bits' being unacceptable is too strong - where is the argument against
15, 18 or 21 bits?  Or the 16 bits of YUV/YIQ (ignore the PAL/NTSC
spatial resolution which clouds this issue).  The main problem is that
quantization (to as few as 256 colours) is not acceptable, rather than
the nunmber of colours.
>
... deleted lines I agree with re nude pictures
>
>JPEG is equally
>useless, since it is lossy and therefore will be impossible to
>distinguish lossy compression artifacts from rendering artifacts.

Initially I agreed with this and then thought: Wait a moment - the
regular printing process ALSO introduces artifacts - the screens
used for quantizing the original artwork.  If only methods of
reproduction that do not introduce artifacts were allowed for
art objects, it would be impossible to produce a catalogue for an art
exhibition with any pictures.

I assume that the electronic form of the SIGGRAPH material is there
for a number of purposes - education, entertainment, technical
evaluation - not for any of these exclusively.  The question must
therefore be whether the encoded form of the pictures meets these
purposes.  For my money, if JPEG at 2 bits per pixel gives an output
that is indistiguishable by expert photographers from the original,
that seems to meet the aim, even though it is 'lossy'.

 Just my opinion.

Chris Osland
Atlas Video Facility
Rutherford Appleton Laboratory, UK
Newsgroups: comp.graphics.visualization
From: theruvak@IASTATE.EDU (Philip Theruvakattil)
Subject: Winged-edge data structure 
Reply-To: theruvak@IASTATE.EDU (Philip Theruvakattil)
Organization: Iowa State University
Date: Thu, 7 Jan 1993 18:16:56 GMT

Hello:
      I need to use a winged edge data structure as part of my research. Could
somebody tell me where I could get the source for the winged-edge data struct.
(c-language) if available. Thank you very much for any help that may be
rendered. 

Philip Theruvakattil
theruvak@iastate.edu




Newsgroups: comp.graphics.visualization
From: keane@eng.umd.edu (Christopher Matthews Keane)
Subject: Converting MATLAB 4.0 raw image to something useful!
Date: Thu, 07 Jan 93 02:44:18 GMT
Organization: Project GLUE, University of Maryland, College Park

I am trying to find out how to convert the .raw saved image files in
MATLAB 4.0 into something a little more standard such as .gif or .tga.
I am using a SUN IPX.

The help on IMSAVE in MATLAB indicates that the .raw is the
intermediate format for Alchemy.  Well, I have used alchemy on a small
image and the coverted format isn't correct!  Does KHOROS or the like
handle these .raw files? 

Please don't say "look in a manual" as I am working over a LAN and the
sole copy of the manuals are in an office of someone who is still on
vacation!

Cheers
Christopher Keane
keane@earthsun.umd.edu
From: Robert.Scott@newcastle.ac.uk (Robert Scott)
Newsgroups: comp.graphics.visualization
Subject: Request for stereoscopic images
Date: 5 Jan 93 16:03:17 GMT
Organization: University of Newcastle upon Tyne, UK NE1 7RU

>Hello.  Does anyone know of where I can get a pair of stereoptic pictures,
>terrain perferably?
>
>Thanks in advance,
>Mike

try ftp to sunsite.unc.edu
in directory /pub/academic/computer-science/virtual-reality/3d
From: spl@szechuan.ucsd.edu (Steve Lamont)
Newsgroups: comp.graphics.visualization
Subject: Re: SDSC Image Tools and PBM Plus
Date: 8 Jan 1993 00:17:25 GMT
Organization: University of Calif., San Diego/Microscopy and Imaging Resource
Distribution: world
NNTP-Posting-Host: szechuan.ucsd.edu

In article <1iif72INNjo7@network.ucsd.edu> nadeau@sdsc.edu writes and
writes and writes and writes...
[473 lines of posting deleted]

Clearly, some folks at SDSC have a *lot* of time on their hands... :-)

							spl
-- 
Steve Lamont, SciViGuy -- (619) 534-7968 -- spl@szechuan.ucsd.edu
UCSD Microscopy and Imaging Resource/UCSD Med School/La Jolla, CA 92093-0608
"Personally, I don't care whether someone is cool enough to quote Doug
Gwyn--I only care whether Doug Gwyn is cool enough to quote." - Larry Wall
From: wave@waits.media.mit.edu (Michael B. Johnson)
Subject: Re: Displaying parallel simulations on a remote ...
Organization: MIT Media Laboratory
Date: Tue, 12 Jan 1993 07:53:29 GMT

lakerb@rcwusr.bp.com writes
> Our ANU News appears to be somewhat brain-damaged and refuses to let me do a
> followup to this group.
> 
> In a recent post, vamsee@abgen.tamu.edu asks about remote computation with
> display of results on an SGI machine.
> 
> I don't know about other packages, but this appears to be a natural for AVS. 
> Each AVS module can be executed via remote procedure calls on a networked  
host,
> modules can be run in parallel, and (I believe) AVS is available for the SGI.
> There are vanilla and optional-at-extra-cost chemistry and molecular module
> libraries for AVS.  Further information should be available from
> support@avs.com.
> 
Yea.  And if the remote machine was a Thinking Machines CM5, this would work  
fine.  I don't believe AVS runs on any of the other big parallel (> 32  
processors) machines.

--

-->  Michael B. Johnson
-->  MIT Media Lab      --  Computer Graphics & Animation Group
-->  (617) 253-0663     --  wave@media-lab.media.mit.edu
-->  NeXT Mail accepted at  wave@nordine.media.mit.edu
From: CDO@IB.RL.AC.UK (C D Osland)
Newsgroups: comp.graphics.visualization
Subject: Re: How can I display an aircraft plot on top of a
 surface-terrain?
Date: 7 Jan 93 09:48:08 GMT

On 6 Jan 93 22:22:39 GMT <lakerb@COM.BP.RCWUSR> said:
>In article <1993Jan5.190352.29059@ncar.ucar.edu>, fredrick@acd.ucar.edu
>(Timothy
> Fredrick) writes:
>>
>> I have an XY dataset of elevations which I can use to draw a surface-terrain
>> map of any square of land in the US.  I have another datset consisting of
>> a series of XYZ coordinates that describe an aircraft track as it flies
>> patters around a particular mountain in New Mexico.
>>
>> I wish to generate a 3D surface map and the aicraft track in the same
>> frame to show the position of the plane in relation to various terrain
>> features.  What is the best software for doing this?
>
>We are running AVS on a Kubota Pacific Titan.  Data is pre-processed on a
>Macintosh Quadra and standard AVS modules do all the visualization.

I needed to do the same - simulated flight around a triple tectonic
plate junction 5 km down in the Indian Ocean - two years ago.  I
designed the flight path on an Iris 3130 using (ancient) GL and then
hand-coded the GL algorithms for our video-making computer.  Also
put in some cubic spline code so I only had to provide keypoints on
the flight path - that was from Numerical Recipes.

This was done as the video sytem did not have any 3D code on it and
I needed the video in a hurry!  Hidden surface removal was achieved
by drawing the picture in the 'right' order (one of four corners of the
scene, either x or y the faster loop) and I just hacked the required
changes into the flight path data.  Quick and very nasty but the
video was made.  If I'd had an extra hour or so I am sure I could
have found some result from the 3D -> 2D transform that would have told
me which the furthest vertex was done it automatically, but there
wasn't time.

Have since added in the GL transformations that I didn't happen to use
(original was lookat and viewpt, latest use was polarview) and done
a visualization of two coincident populations - wireframe for one,
telegraph poles for the other, using the same code.

If this is of use to anyone, I can easily send it, although it is
exceedingly 'as is' so I would prefer to send to individuals, not
the list.

Chris Osland
Atlas Video Facility
Rutherford Appleton Laboratory, UK
Newsgroups: comp.graphics.visualization
From: rob@dinner.asrc.albany.edu (Robert D. Seals)
Subject: Scene Visualizer with Ray Trace output?
Organization: SUNYA - ASRC, Albany, NY
Date: Wed, 6 Jan 93 15:17:18 GMT

Hello,

Does there exist a simple object constructor - say a wire frame
thingy - that can produce output suitable for input to a raytracer?
I guess what I want is something like a CAD program, but simpler.
And Rayshade would be the tracer of choice.

I realize that Autocad and its visualization hickeys can do this,
but I can't justify the cost, and we're very poor. So the ideal
thing would be on the big bad net somewhere.

Hopefully,

rob
-- 
------
Sing Little Birdy?
rob@dinner.asrc.albany.edu
From: jshade@sdsc.edu (Jonathan Shade)
Newsgroups: comp.graphics.visualization
Subject: Re: Question about CG education
Date: 4 Jan 1993 20:55:42 GMT
Organization: San Diego Supercomputer Center @UCSD.
Distribution: world
Reply-To: jshade@sdsc.edu
NNTP-Posting-Host: natasha.sdsc.edu

There is a junior college in Mountainview California that has a lab
of SGI machines and offers about 10 classes in computer graphics 
ranging from 'intro to graphics programming' to 'advanced ALIAS'.

I don't think they offer a CG degree, but it is a great place to get
started for REALLY cheap. A quarter of tuition is less than $100.


			-jOn

---
--------------------------------------------------------------------------------
jOnathan 								   Shade
			      -- CONFUSED --

--------------------------------------------------------------------------------
From: sabraham@gandalf.rutgers.edu (Shibu Abraham)
Newsgroups: comp.graphics.visualization
Subject: Help with freedom of Press
Keywords: Freedom of Press
Date: 8 Jan 93 01:23:22 GMT
Organization: Rutgers Univ., New Brunswick, N.J.


Does anyone know the setting to use on Freedom of Press so that I 
can image slides to a Solitaire camera that were created in
 Harvard 3.0. Please send any comments to
			sabraham@gandalf.rutgers.edu

Thanks in advance
From: mww@eng.cam.ac.uk (Mark Wright)
Newsgroups: comp.graphics.visualization
Subject: input path to rayshade and radiance raytracers
Keywords: CAD raytracer input
Date: 11 Jan 93 16:26:34 GMT
Distribution: comp.graphics.visualization
Organization: Cambridge University Engineering Department, UK

Hello,
      Does anyone know a path from the IGES or VDA-FS CAD data 
formats into the rayshade or radiosity raytracers?

I want to construct a number of fairly complex 3D models
from HP's ME30 3D CAD system to rayshade or Radiance ray tracers.
The ME30 package outputs IGES or VDA-FS. 
I know packages that will take nff, off files and output to the
the raytracers. I am looking for a public domain/shareware filter
or package that has this ability built in.

Thanks for any help.

-------------------------------------------------------------
Mark Wright
Speech, Vision and Robotics Group
Cambridge University Engineering Department
Trumpington Street, Cambridge, England CB2 1PZ
Tel: +44-223-332754 Fax:+44-223-332662
EMail: mww@eng.cam.ac.uk
-------------------------------------------------------------
From: domik@wilkinson.cs.colorado.edu (Gitta Domik)
Subject: High-Performance Scientific Computing -- workshop for Undergrads
Organization: University of Colorado, Boulder
Distribution: usa
Date: Wed, 6 Jan 1993 21:01:10 GMT


		Summer Workshop for Undergraduates
	      High-Performance Scientific Computing 
	University of Colorado, May 24 - June 4, 1993


This residential workshop is designed for upper division undergraduate 
students who are interested in learning about the use of supercomputers,
high-performance workstations, and  visualization in scientific 
computing. Workshop participants will use a Connection Machine (CM-2), 
a Cray Y-MP, DEC 5000 and SGI Indigo workstations, AVS and IDL (scientific
visualization tools) for solving problems in molecular dynamics, 
wave motion, and visualization of data. Note that this is not a 
visualization workshop but rather a workshop to show how visualization
in used and applied.

Participants will reside in Kittredge Residence Halls on the University campus.
Classes and laboratory sessions will be held in the Engineering Center
located nearby. Residence expenses (room and board) will be paid by
a grant from the National Science Foundation. Transportation expenses will
not be covered.

Attendance at the workshop will be limited to sixteen students. Selection
of participants will be based on the following criteria:

	Statement of interest. This statement describes
	why the applicant is interested in participating in the workshop, 
	relevant academic experience and interests, and long-range goals.

	Letter of recommendation by faculty member. This letter should be 
	written by a faculty member who has served as the student's
	academic advisor or teacher. It should describe the student's 
	strengths, academic performance, and potential for achievement.

	Satisfying the prerequisites. The prerequisites are experience with
	the Unix operating system, two semesters of calculus, one semester of
	numerical analysis, two semesters of courses in physical or biological
	science.

Some course materials are available by anonymous FTP from cs.colorado.edu
in directory /pub/cs/HPSC.

Inquiries and applications should be sent to: Professor Elizabeth Jessup,
Dept. of Computer Science, University of Colorado, Boulder, CO 80309-0430;
tel. (303) 492-0211; e-mail jessup@cs.colorado.edu. 

		APPLICATION DEADLINE MARCH 31

-------------------------------------------------------------------------

There is no application form, but your application letter should include 
the following:

=      Name
=      Affiliation and position or class
=      Mailing address
=      Phone number
=      Email address
=
=      Statement of interest as described in the announcement.
=      A description of your relevant background including your experience
=         with the prerequisites listed in the announcement.
=      The letter of recommendation from a faculty member.
From: rsk@gynko.circ.upenn.edu (Rich Kulawiec)
Newsgroups: comp.graphics.visualization
Subject: Re: SDSC Image Tools and PBM Plus [and FBM and XV and Khoros...]
Summary: No source code; no sale.
Date: 8 Jan 93 12:14:52 GMT
Organization: Ditka Policy Institute

In article <1ifpdeINN2ov@network.ucsd.edu> nadeau@sdsc.edu writes:
>And so on.  There are significant differences between the SDSC Image Tools
>and the PBMPlus package.  Let us return to the net posting that sparked this
>discussion:
>
>	>Don't forget pbmplus *is* available in source code and does 99 percent
>	>of what imconv does (and often does it faster!).  It's available with
>	>the X11 distribution in the contrib directory or from your favorite
>	>FTP site (wuarchive.uwstl.edu comes to mind).
>
>-  PBMPlus clearly does *not* do 99% of what the SDSC Image Tools do.

I think you're missing the point.  PBMplus (and the packages which
many of us use with it: Mauldin's FBM package, the JPEG toolkit,
Sam Leffler's TIFF package, and the XV image viewer) can all be used
together to create a fairly powerful image manipulation and conversion
environment.  Each by itself has its own merits and faults, but 
combined together, they've served the network community quite well.
Each of these packages has also benefited from the authors' willingness
to integrate fixes and improvements from the network community.

For those with needs that go beyond relatively simple conversion, scaling,
and resizing, the freely-available Khoros package provides a *huge*
suite of extremely powerful tools -- utilities, libraries, GUIs and
copious documentation -- whose functionality goes far beyond anything
brought up in this discussion so far, and whose free support from the
folks at U. New Mexico has been absolutely outstanding.

Whether these packages do 99% of what the SDSC image tools do or not
is immaterial; they're freely available in SOURCE CODE form, which
is a killer advantage over the SDSC tools.

---Rsk
From: lakerb@rcwusr.bp.com
Newsgroups: comp.graphics.visualization
Subject: Re: Displaying parallel simulations on a remote ...
Date: 9 Jan 93 10:25:48 -0600
Organization: BP Research, Cleveland, OH (USA)

Our ANU News appears to be somewhat brain-damaged and refuses to let me do a
followup to this group.

In a recent post, vamsee@abgen.tamu.edu asks about remote computation with
display of results on an SGI machine.

I don't know about other packages, but this appears to be a natural for AVS. 
Each AVS module can be executed via remote procedure calls on a networked host,
modules can be run in parallel, and (I believe) AVS is available for the SGI.
There are vanilla and optional-at-extra-cost chemistry and molecular module
libraries for AVS.  Further information should be available from
support@avs.com.

Rob Lake
BP Research
lake@rcwcl1.dnet.bp.com

Newsgroups: comp.graphics.visualization
From: buck@ra.nrl.navy.mil (Loren Buchanan)
Subject: Re: SDSC Image Tools and PBM Plus
Followup-To: comp.graphics.visualization
Summary: Don't fight SDSC, support them
Keywords: image conversion
Organization: Naval Research Lab, Washington, DC
Date: Fri, 8 Jan 1993 16:27:44 GMT

In article <1iif72INNjo7@network.ucsd.edu> nadeau@sdsc.edu writes:
>
>There is no such thing as having too many tools.  If one package
>doesn't satisfy your needs, perhaps another will.  We developed the SDSC
>Image Tools to satisfy a class of needs that we did not see as being satisfied
>by other packages out there.  However, in the same vein, PBMPlus satisfies a
>number of needs the Image Tools do not.  You are free to choose whatever
>package you wish.  We recommend that you choose both.

We use both, but mostly the Image Tools.  The cases where we use PBMplus
is where the format is not supported by Image Tools.  If you have a format
that is not supported by Image Tools and feel that is important I would
suggest that you write the reader and writer for that format in the Image
Tools style (they do release some example source code) and once you have it
debugged and documented, send a request to SDSC to have it included in the
next release.

I was very unhappy with the PostScript generation code in the first release
and I told SDSC where they could get the source code to an improved PostScript
code generator that I had written (which SDSC has since heavily modified and
improved on).

Let's stop bickering about who is better than who, and there is very little
chance that this discussion here on the net is going to change the opinion
of management at SDSC.  Let's put our collective energies to developing 
better tools to support our work.

B Cing U

Buck

-- 
Loren Buchanan (buck@curie.nrl.navy.mil) | #include <standard.disclaimer>
NRL Code 5842, 4555 Overlook Ave.        | #include <computer.graphics>
Washington, DC 20375      (202) 767-3884 | #include <electronic.music>
Phone tag, America's fastest growing business sport.
From: fredrick@acd.ucar.edu (Timothy Fredrick)
Newsgroups: comp.graphics.visualization
Subject: How can I display an aircraft plot on top of a surface-terrain?
Date: 5 Jan 93 19:03:52 GMT
Organization: Ntl Center for Atmospheric Research - Atmospheric Chemistry Div


I have an XY dataset of elevations which I can use to draw a surface-terrain
map of any square of land in the US.  I have another datset consisting of
a series of XYZ coordinates that describe an aircraft track as it flies
patters around a particular mountain in New Mexico.

I wish to generate a 3D surface map and the aicraft track in the same
frame to show the position of the plane in relation to various terrain
features.  What is the best software for doing this?  Is there public
domain software we can use for an IBM Risc-System 6000 running X11R4 or
X11R5?  Unfortunately, I don't think we have the necessary graphics
adapters to run the package "vis5d".  Is there any MacIntosh software
that would allow us to do something like this?  We tried to use Deltagraph
but it manages memory inefficiently and couldn't generate any but the
most simple surface-terrain maps.

Any suggestions or advice would be greatly appreciated.  Thanks in advance.

--Tim Fredrick (fredrick@acd.ucar.edu)
  Ntl Center for Atmospheric Research, Boulder, CO 80307-1000
.
Newsgroups: comp.graphics.visualization