HDTenEightyP/NetNews huggingface dataset:
From: gary@enigma.esd.sgi.com (Wizard of OZ)
Newsgroups: comp.graphics.explorer
Subject: Re: streak.c and average velocity
Date: 11 Dec 1992 18:52:28 GMT
Organization: Silicon Graphics Computer Systems, Mountain View, CA
Distribution: world
Reply-To: gary@sgi.com
NNTP-Posting-Host: enigma.esd.sgi.com

In article <1992Dec11.160107.8845@seas.gwu.edu>, favre@seas.gwu.edu (Jean Favre) writes:
|> From: favre@seas.gwu.edu (Jean Favre)
|> Newsgroups: comp.graphics.explorer
|> Subject: streak.c and average velocity
|
|> I have been looking at the code of streak.c in the Streakline module so I
|> could modify it for my own needs. I am puzzled by the following line in the 
|> code, where the average velocity is computed:
|> 
|> ave_vel =
|>    velocity[0]*velocity[1]+velocity[1]*velocity[1]*velocity[2]*velocity[2];
|> 
|> Shouldn't this be:
|> 
|> ave_vel = 
|>  velocity[0]*velocity[0]+velocity[1]*velocity[1]+velocity[2]*velocity[2];
|> 

Yes, you are correct. One more typo caught.

This value was only used in determining when a dead spot was found, so
the actual streaks are correct. It just may have stopped at the wrong time.

Note that an expensive sqrt is not used because it is just a criteria for
completion.

|> -- 
|> Jean M. Favre. EE&CS Dept. The George Washington University
|> 		(202) 994 5917
|> 		favre@seas.gwu.edu

-- 

Gary Griffin			Second to the left	
gary@sgi.com			Straight on to morning
						P. Pan	
Think WORLDWIDE
Newsgroups: comp.graphics.explorer
From: srfergu@rufus.erenj.com (Scott Ferguson)
Subject: Shared Memory Question
Organization: Exxon Research & Engineering Co.
Date: Mon, 14 Dec 1992 17:30:23 GMT

In a network of mine, I'm repeatedly running a loop that sequences
through time, interpolates a time slice, renders, then records to video.

After about 200 or so frames (time slices), the machine bogs down, and
starts thrashing. The order of execution gets strange, things slow
down severely, etc.

I assume I must have filled up available memory some how and I've started
paging heavily.

One of my modules creates a new lattice with cxLatNew, and returns a pointer
to the lattice which goes to the module output port. I assumed that the
Explorer executive would automatically free this lattice for me. Is that 
incorrect? Should I be keeping this pointer as a global variable, and doing
a cxDataFree on it before creating new lattices?

Thanks
-- 
----------------------------------------------------------------------
Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      New Jersey
----------------------------------------------------------------------
"Remember, if you win the rat race, you're still a rat."
From: gordonc@epcc.ed.ac.uk (Gordon Cameron)
Newsgroups: comp.graphics.explorer
Subject: Re: Where's the FAQ???
Date: 15 Dec 92 15:59:55 GMT
Organization: Edinburgh Parallel Computing Centre


In article <Bz9wy2.IK6@rice.edu>, micah@ravl.rice.edu (Micah Samuel Rosen) writes:
> I've been in on this newsgroup for two weeks now, have a ton of
> questions, and want to know what the heck is going on...
> 
> Where's the FAQ posting ?
> 
>  ... or where's the FAQ ftp site
> directory etc.

FTP Sites :
	swedishchef.lerc.nasa.gov	- /explorer
	ftp.epcc.ed.ac.uk		- /pub/explorer


FAQs in the /FAQ directory....Also extracts in Jeff's newsletter, on
swedishchef (in /ieug)

Please note that the ftp sites and FAQ are purely voluntary services. 
In addition, both sites have no affiliation with SGI. There is a tendency
to expect these things, and take them for granted, but both myself
and Jeff have full time jobs on top of all the Explorer stuff.

Apologies from myself for not doing too much update stuff of late, but things
have been kind of busy...
	-G.

P.S. Anyone want to add to the FAQ ?- it hasn't been touched for a long while.


-- 
e|p Gordon Cameron                      |     Phone:+44 31 650 5024(Rm. 2259)
c|c Edinburgh Parallel Computing Centre |     Email: gordonc@epcc.ed.ac.uk
    oOo The University of Edinburgh oOo |    'So far so good, so now so what'
Newsgroups: comp.graphics.explorer
From: srfergu@rufus.erenj.com (Scott Ferguson)
Subject: Line Width?
Organization: Exxon Research & Engineering Co.
Date: Mon, 14 Dec 1992 15:04:20 GMT

There doesn't appear to be a way to adjust line thickness in the 
Geometry creation API. Is there one? Will there be one in the future?
Perhaps simply another argument to the cxGeoLinesDefine call?

Single-pixel-thick lines don't record onto interlaced video very well.
Thanks.

-- 
----------------------------------------------------------------------
Scott Ferguson                        Exxon Research & Engineering Co.
Project Engineer                      New Jersey
----------------------------------------------------------------------
"Always bark at a dog."
From: gt3021b@prism.gatech.EDU (Eric Zundel Ayers)
Newsgroups: comp.graphics.explorer
Subject: Problem building modules
Date: 12 Dec 92 00:44:49 GMT
Organization: Georgia Institute of Technology

Any help with the following problems greatly appreciated!

First of all, I have tried to subscribe the the explorer mailing list
through explorer-request@castle.ed.ac.uk and have had no response.
Could my request getting lost somewhere?  Could someone from the list
please contact me?

Secondly:
I have had some problems building explorer modules.  

  a) I tried to enter the example module in the User's Guide (3.1.1),
     but my created module seems to crash with the next call to the Explorer
     API after I call cxGeoRoot(); (I discovered this by doing simple
     printf's after each call, so I may be off here.) 

  b) On a module under development, we discovered that we needed to add another
     input port.  We edited the .mres with module builder and added the
     code to call it within our function.  (We are not using the Data
     Wrapper we are using X in a drawing area)  I call cxInputPortOpen
     and I get back an integer (3, the third parameter defined in the
     mbuilder)  But when I call cxInputDataGet, I get a ptr  to 0 and
     then, of course, the call to cxParamStrGet fails.  When I try to
     get its type, cxParmTypeGet returns a -1.  

Thanks again!
Eric.
Eric Z. Ayers
zundel@cc.gatech.edu
Graphics, Visualization, and Usability Center (GVU)
Georgia Institute of Technology, Atlanta, GA 30213 USA
-- 
                                   \\||//
Eric Zundel Ayers                  +----+
Georgia Institute of Technology    |----|         College of Architecture
gt3021b@prism.gatech.edu           +----+    Home of the House of Suicide
Newsgroups: comp.graphics.explorer
From: adfernan@cayley.uwaterloo.ca (Andrew D. Fernandes)
Subject: Bug in ReadPDB
Organization: University of Waterloo
Date: Thu, 17 Dec 1992 23:27:03 GMT


There seems to be a bug in SGI's release of the ReadPDB module. It works
just fine for single letter abbreviation atoms, but it incorrectly handles
two letter atom names. I believe the problem stems from the right
justification in the PDB standard. The program, judging by the source,
assumes left justification.

I didn't know who to mail the bug to, so here it is...

-Andrew.
From: hashimoto@sgi.com (Roy Hashimoto)
Newsgroups: comp.graphics.explorer
Subject: Re: Render grows indefinitely
Date: 14 Dec 1992 22:53:06 GMT
Organization: Silicon Graphics, Inc.
NNTP-Posting-Host: sideout.asd.sgi.com

In article <1992Dec14.212433.15209@erenj.com> srfergu@rufus.erenj.com (Scott Ferguson) writes:
>Each time I looped through my map, Render got a little bigger.
>
>I hope either 1) I can get this fixed without having to wait for 2.0, or
>              2) It's fixed in 2.0 and 2.0 is in the mail right now.
>
>Any suggestions? Any way I can work around it? Thanks

This is a known memory leak in 1.0.  The problem has been fixed for 2.0,
which has not yet been released.  Unfortunately, I don't know of an easy
workaround for 1.0.

Roy Hashimoto
hashimoto@sgi.com
From: HANS@PINE.CIRCA.UFL.EDU (VAN_OOSTROM)
Newsgroups: comp.graphics
Subject: Re: Looking for copy of VESA standard
Date: 11 Dec 92 22:22:04 GMT
Organization: UNIVERSITY OF FLORIDA
X-News-Reader: VMS NEWS 1.24

In <1992Dec7.091748.3093@mfltd.co.uk> sts@mfltd.co.uk writes:

> 
> In article <1ftgdqINN711@gap.caltech.edu>, mikec@ugcs.caltech.edu (Michael Hamilton Coward) writes:
> |> Hi, subject line says it all - I need a copy of the VESA standard in order
> |> to program my graphics card.    
> |> 
> |> Thanks,
> |> Mike     

Just call this number (408) 435-0333, and they will send you a free package
with the whole specification and a disk.
Ask for the VESA Super VGA standard documentation

Hans van Oostrom                    KD4MUJ
PO Box J-254, JHMHC                 hans@ufpine                (BITNET)
Gainesville, FL  32601, USA         hans@pine.circa.ufl.edu    (INTERNET)
>>>          Hoe ver je ook gaat, overal zie je landgenoten           <<<
From: jfranzen@usc.edu (Jody Franzen)
Newsgroups: comp.graphics
Subject: 3D Studio Movie Project
Date: 20 Dec 1992 18:32:31 -0800
Organization: University of Southern California, Los Angeles, CA
Distribution: world
NNTP-Posting-Host: aludra.usc.edu

From: jfranzen@usc.edu (Jody Franzen)
Newsgroups: comp.graphics.anim
Subject: 3D Studio rel.2 Galaxy Creator
Expires: 
Followup-To: 
Distribution: world
Organization: University of Southern California, Los Angeles, CA
Keywords: 

    Hello all.  I'm working on a film project that has a scene were your 
viewpoint flies towards and into a galaxy.  I'm looking for any type of IPAS
routine or suggestions on how to create a VERY realistic looking galaxy that
is similiar to the Milky Way.  Also, another scene has you flying into the 
rings of Saturn with all it's composite particles of ice zipping by you.
I'd also like suggestions on how to accomplish that.  And while I'm asking, 
does anyone know of a way to convert from .3DS to SoftImage format on the SGI?
I'm aksing 'cause my lab has an Iris and all the final rendering will be done 
on it.  Thanks,

				J. J. Franzen
				 Go Trojans!

From: jfranzen@usc.edu (Jody Franzen)
Newsgroups: comp.graphics,comp.graphics.animation
Subject: 3D Studio Movie Project Help!!
Expires: 
Followup-To: 
Distribution: world
Organization: University of Southern California, Los Angeles, CA
Keywords:
From: schwenk@fred.cis.udel.edu (Peter A. Schwenk)
Newsgroups: comp.graphics
Subject: IBM 8515 Monitor questions
Date: 17 Dec 92 17:28:08 GMT
Organization: University of Delaware, Newark

Howdy,

As you have figured out from the subject line, I had some questions regarding
the modes offered by an IBM 8515 monitor.  I've got a cheapo Trident 9000
graphics card that does 1024x768, but it and the monitor don't want to synch-
up right.  First of all, is the above monitor a non-interlaced or interlaced
monitor at 1024x768?  Next, is the above monitor a multi-frequency monitor, or
does it just handle a few resolutions (and frequencies, one each for 640x480,
800x600, and 1024x768)?  Oh, yea, I forgot to mention I can't get the card/
monitor combination to synch-up at 800x600 mode either.  In either case, the
screen looks like it is trying to to synch-up, but it is just a few scan-lines
off.

If someone has some information about these problems, please email me with
some answers.

Thanks,

	Peter Schwenk
From: wcsintd7@alfred.carleton.ca (Peter Kuciak)
Newsgroups: comp.graphics
Subject: NEED Tiff Source ...
Keywords: TIFF
Date: 16 Dec 92 16:08:56 GMT
Organization: Carleton University

Hello all, just as the subject says, I am in search of source (C
source) to read/write TIFF files.  It has to be straight C source, no
ASM, obj or lib since it will go onto RS/6000 for my project.  If this
is a FAQ please, no hate mail since I just started to read this group.
Thanx to everyone in advance, peter.

Peter A. Kuciak    e-mail: wcsintd7@ccs.carleton.ca


.sig on vacation
Newsgroups: comp.graphics,rec.games.programmer
From: chrisp@wimsey.bc.ca (Chris Phillips)
Subject: Re: Algorithm for Bitmap rotation & scaling
Organization: Wimsey Information Services
Date: Sat, 19 Dec 1992 11:42:10 GMT
X-Newsreader: Tin 1.1 PL5

Kristof Roomp (krisr@cue.bc.ca) wrote:
: in the bitmap. When assembler is used to speed things up, you can get 
: Wing Commander performance (i think this is how wing commander does it
:i anyhow). The only problem i'm having is with the boundry points. How to 
:quickly

I think Wing Commander uses bitmap shearing. It lots faster but not as
accurate.

	Chris
From: capelli@vnet.ibm.com (Ron Capelli)
Date: Tue, 15 Dec 92 17:49:24 EST
Newsgroups: comp.graphics
Subject: Re: Clipping polygon to rectangle
Disclaimer: This posting represents the poster's views, not those of IBM
News-Software: UReply 3.0

In <724442088.9285@minster.york.ac.uk> john@minster.york.ac.uk writes:
>I have read the subsections of ``Computer graphics: principles
>and practice'' [Foley90], which describe algorithms for clipping a
>polygon to a rectangle. None of the algorithms there meet my desire
>for correctness with simplicity and practicality. (I do not require
>completeness, as I am prepared to accept the output of a single degenerate
>polygon instead of a list of disjoint polygons.) I've not found
>anything better in older graphics textbooks, or in a brief literature
>search. (Ok, so I'm crying for the moon - but someone out there
>probably has a method of reaching it. :-))
>
>The Sutherland-Hodgman algorithm (described in [Foley90] and older
>graphics texts I have read) clips against each side of the
>rectangle in turn, and produces three intermediate polygons - which
>I assume require a (single, extra) temporary buffer to hold them.
>This I do not like.

No intermediate polygons need be saved between stages of a
Sutherland-Hodgman polygon clipper.

The clipped edges output for each side of the clipping region
(eg., rectangle) are in the order they need to be considered
for the next side.  Therefore, the stages can be cascaded in a
recursive-like way.  The output of each stage except the last
can be implemented as a call to the subsequent stage, and the
last stage outputs the edges of the clipped polygon, possibly
with degenerate edges along the sides of the clipping region.

The title of the original paper by Sutherland and Hodgman,
"Reentrant Polygon Clipping", CACM, vol 17, no 1, Jan 1974,
refers to this cascading of clipping stages.
_______________________________________________________________________

...Ron Capelli                 IBM Corp.  Dept. C13,  Bldg. 703-2
   capelli@vnet.ibm.com        PO Box 950
   (914) 435-1673              Poughkeepsie, NY  12602
_______________________________________________________________________

"There are no answers, only cross-references."
Newsgroups: comp.graphics,comp.multimedia,comp.sys.sun.wanted
From: davea@xetron.com (Dave Alverson)
Subject: Where to find cslip & sliplogin for SunOS 4.1.3
Keywords: cslip sliplogin
Organization: Xetron Corporation, Cincinnati, Ohio
Date: Sat, 12 Dec 1992 05:56:14 GMT

(I posted this a couple days ago, but I dont think it got out.)

We have a SPARCstation 2 with SunOS 4.1.3 and would like to add cslip
capability.  We got slip and sliplogin from uunet, but its not cslip and
the sliplogin seems to be for a different version of [c]slip.
Wheres a good place to get cslip for our configuration?

BTW, does anyone know why cslip is not available from ftp.ee.lbl.gov or from
uunet?

  Thanks for any help,
  -- Dave

-- 
Z    Dave Alverson,  davea@xetron.com
From: patrick@broom.turing.ac.uk (Vorgers)
Newsgroups: comp.graphics
Subject: Re: vga animating w/o flicker
Date: 16 Dec 92 12:20:25 GMT
Distribution: comp
Organization: The Turing Institute, Glasgow, Scotland.

In article <1992Dec10.4387.20691@dosgate>, danny.hawrysio@canrem.com (danny hawrysio) writes:
|> 
|>  Does anybody know how to eliminate flicker while animating in VGA
|> modes?
|> --
|> Canada Remote Systems  - Toronto, Ontario
|> World's Largest PCBOARD System - 416-629-7000/629-7044

You have to wait for the vertical retrace and then you can update your screen
without flickering. You also have to use this when you install a new colormap.

PASCAL-ASM.

procedure waitretrace; assembler;
Label wait0,wait1;
asm
	mov	dx,3dah
wait0:	in	al,dx
	test	al,8
	jnz	wait0
wait1:	in	al,8
	test	al,8
	jz	wait1
end;
Newsgroups: comp.graphics
From: tponghen@trantor.dso.gov.sg (Tan Pong Heng)
Subject: Cirrus Logic Accelerator VGA Card
Organization: DSO
X-Newsreader: TIN [version 1.1 PL6]
Date: Mon, 14 Dec 1992 01:20:46 GMT

Hi, I am not sure if this is the right place to post this question.
I would like to find out more about the Cirrus Logic Accelerator VGA Card.
This is a true color card with 1MB of RAM.  The guy who tried to sell me
this card told me that it run windows faster than the Tseng Lab card, and
it is a lot cheaper. I am interested in getting a true color card, but
not just for windows, so I would like to find out if any body has
any experience with this card and how to program the card directly without
using the supplied drivers.  To be more specific, I need to know how to
switch pages and access all the 1MB onboard.
Many thanks in advance.

Tan Pong Heng
Newsgroups: comp.graphics
From: e-sink@uiuc.edu (Eric W. Sink)
Subject: Re: SDSC Image Tools V2.1 Release
Originator: sink@ux2.cso.uiuc.edu
Reply-To: e-sink@uiuc.edu
Organization: University of Illinois at Urbana
Date: Thu, 17 Dec 1992 15:18:52 GMT
Keywords: image file format, graphics, pixel utilities, image processing

A short time ago, I was going to post a question about the issue of
making PBMPLUS a single application.  I wasn't necessarily suggesting
or advocating it.  I simply assume that the issue has been discussed,
and wondered what the pros and cons were.  It sounds to me like the
SDSC stuff sort of fills the need in that area.  Am I correct ?

I still think it would be neat to have a GUI front end to PBMPLUS.
Even if it was simply a user interface which executed the existing
tools, it would make the system more accessible to the easily
daunted.  If it were written in Xgen or Tk or something like that,
it could be easily modified as PBMPLUS grows.

-- 
Eric W. Sink, Spyglass        | "You are the Pan."
1800 Woodfield Drive          |     - Rufio
Savoy, IL  61826              |
---- e-sink@uiuc.edu ---------|---------- 217-355-6000 -----------------------
Newsgroups: comp.graphics,sci.math.num-analysis,sci.math,sci.math.stat,sci.electronics,sci.engr
From: wes@ian.stx.com (John S.)
Subject: What newsgroup is this?
Followup-To: alt.flame
Organization: STX, Lanham Maryland
Date: Tue, 15 Dec 1992 17:15:58 GMT

I thought I was looking at sci.engr, but I must be mistaken. I just
went through several articles about stereotypes and net advertising.
Out of about thirty articles, there were maybe two or three that had
anything to do with engineering. Please take it elsewhere.
Newsgroups: comp.graphics
From: 03249587@mama.minmet.uq.oz (Darcy Clark)
Subject: Screen Printing (colour separation)
Organization: Prentice Centre, University of Queensland
Date: Fri, 18 Dec 1992 01:46:12 GMT

 A friend of mine wants a program which will separate a GIF into its component
 colours and print each 'layer' inidividually- this is so he can make the screens for each colour that make up the design. Anyone tried this or can provide
 some pointers??
		 Darcy Clark
		 03249587@minmet.uq.oz.au
Newsgroups: comp.graphics
Subject: Height field data
From: shachar@ramon.bgu.ac.il (Shachar Fleishman)
Date: Mon, 14 Dec 1992 19:24:31 GMT
Organization: Ben-Gurion University, Beer Sheva, Israel
X-Newsreader: Tin 1.1 PL3

Does anyone have, or know where I can get height field data?

Thanks in advace

- Shachar
From: bce@sactoh0.sac.ca.us (Byron C. Ellis)
Newsgroups: comp.graphics
Subject: Waves in RayShade4
Keywords: Waves
Date: 14 Dec 92 04:04:11 GMT
Organization: Sacramento Public Access Unix

I recently got a copy of Rayshade v4.0, and i was wondering how to do
waves in it... I didn't see anything about in the docs, and i wanted to do
an underwater scene, with the light refracted/reflected like it would be
if there were waves on the surface...
-- 
Flying (v) : The art or knack of throwing : Byron C. Ellis
yourself at the ground and missing        : Internet: bce@sactoh0.SAC.CA.US
-The more than complete Hitchikers Guide  :
 to the Galaxy trilogy                    :
Newsgroups: comp.graphics,comp.os.msdos.programmer,comp.msdos.programmer
From: comptec91046@camins.camosun.bc.ca
Subject: Re: bitmap
Organization: Camosun College
Distribution: na
Date: Sat, 12 Dec 1992 22:32:19 GMT

In article <1992Dec12.051026.29524@mnemosyne.cs.du.edu>, slindsay@nyx.cs.du.edu (Steve Lindsay) writes:
> 
> I am working with Borland C++ 3.1 and VGA trying to use the 
> Graphics.h library.  When I change my setbkcolor to BLUE and
> then change setcolor to BLACK (current drawing color) and try
> to draw it is not in black it is in blue.  Or at least I think it is
> blue because I cannot see the lines.  
> 
> What is the deal?  Does Graphics.h change the background color
> by changing color number 0 (BLACK) to what ever color I tell it 
> and then when I try to draw with number 0 (BLACK) it is not black
> but the same as my background color.

I'm pretty sure that 0 isn't Black but is transparent)  I think Black is 4 or
something like that.

Chris
From: gupta@crhc.uiuc.edu (Aloke Gupta)
Newsgroups: comp.graphics
Subject: Survey on architecture support for Graphics/multimedia
Date: 11 Dec 92 19:36:40
Organization: University of Illinois Center for Reliable & High Performance
	Computing
Distribution: comp
NNTP-Posting-Host: buctril.crhc.uiuc.edu


    Hi, I am compiling a survey on architecture support for advanced
    visually-oriented applications

    Some aspects of this survey are the following:

    1. Support for graphics function in general-purpose processors.
    2. Sp. purpose coprocessors that offload work from main processors.
    3. Design choices in actual workstation systems ranging from Xterminals
       to advanced modeling/visualization engines.

    Some related areas include design of laser-printer engines / Postscript
    interpretors.

    Some of the microarchitecture issues are:
    =========================================

    1. Techniques for optimizing frame-buffer access.
        > Sp. cache instructions, e.g., allocate-no-fetch as in 88110.
        > Small frame-buffer write-back cache with 1/60 sec flushing.
        > Tiling organization of frame-buffer for exploiting access locality.
    2. Support for saturating arithmetic.
    3. Packed pixel arithmetic.
    4. Support for single-cyle x,y addressing.
    5. TLB support for different page sizes.
    6. Support for the special requirements posed by applications such as
        > MPEG
        > Display Postscript
        > 3-D graphics and viewing transforms
        > Gouraud/Phong shading
        > Real-time video processing
        > Speech recognition
--
Aloke Gupta                                         E-mail: gupta@crhc.uiuc.edu
Coordinated Science Laboratory                           or a-gupta@uiuc.edu
Dept. of Electrical & Computer Engineering
Univ. of Illinois at Urbana-Champaign
From: kevinm@ocf.berkeley.edu (Kevin Miller)
Newsgroups: comp.graphics
Subject: G-I-F pronunciation
Date: 12 Dec 1992 23:31:27 GMT
Organization: U. C. Berkeley Open Computing Facility
Distribution: na
NNTP-Posting-Host: monsoon.berkeley.edu

A friend and I have a little wager, that I would like to get settled before
the end of the semester.  How is G-I-F pronounced? Gif as in "Gift" without
the "t" or "Jif" as in the peanut butter?

Any help is greatly appreciated!  I want to collect my $5!

Kevin
kevinm@ocf.berkeley.edu

PS...Please respond through E-mail, as I don't regularly read this sub.


Newsgroups: comp.graphics