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re pov previewer actually i am trying to write something like this but i encounter some problems amongst them drawing a d wireframe view of a quadric quartic requires that you have the explicit equation of the quadric quartic x y z functions of some parameters how to convert the implicit equation used by pov to an explicit one is it mathematically always possible i don t have enough math to find out by myself has anybody heard about useful books on the subject

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re real time graphics in article c va r kk taurus cs nps navy mil stockel oahu oc nps navy mil jim stockel writes hi i will be writing a data acquisition program to collect data from a variety of sources including rs and external a d s and i would like to be able to display the data in near realtime i ve done this type of thing on pc s and other machines but i am unaware of any graphics package that could help me with this on a unix machine does anyone have any ideas on commercial or free packages that might suit my needs i would really appreciate any input i m sure this has been done many times before for a commerical package try wave from precision visuals for a free package try khoros from university of new mexico ftp from ptrg eece unm edu login in anonyomus or ftp with a valid email address as the password cd pub khoros release that will get you to the right place david

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bgi drivers for svga i require bgi drivers for super vga displays and super xvga displays does anyone know where i could obtain the relevant drivers ftp sites regards simon crowe

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re vesa on the speedstar kjb mgl uvesa zip this is a universal vesa driver it supports most video boards chipsets include the speedstar and x up to bit color terry p s i ve tried it on a speedstar and x and it works not with all software for instance it doesn t work at all with animator pro from autodesk it can t detect any svga modes when running univesa this is really a problem as we need a vesa driver for both aa pro and some hi color stuff just out of curiosity are you using the latest version versions previous to this did not fill in all of the capabilities bits and other information correctly i had problems with a lot of software until i got this version i don t think the author got around to posting an announcementof it or at least i missed it but was available in the directory indicated as of i sure did use version it works fine with most software but not with animator pro and that one is quite important to me pretty useless program without that thing working imho so i hope the author can fix that daniel daniel falk don t quote me no comments ebenezum the great wizard d fad tekn hj se d fad hjds hj se also known as the mega famous musician jkpg sweeeeeden leinad of the yellow ones

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none set bear with me i m new at this game but could anyone explain exactly what dmorf does does it simply fade one bitmap into another or does it re shape one bitma p into another please excuse my ignorance i not even sure if i ve posted thi s message correctly

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help wanted for dmorf please bear with me as i am new at this game i apologize unreservedly if i hav e posted another message earlier by mistake but i digress could anyone out th ere please explain exactly what dmorf does dtax exe does it simply fade one bitmap into another or does it reshape one bitmap into another excuse my ignor ance

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test sorry

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re rumours about do they need a hit software product to encourage software sales of the product i e the pong pacman visicalc dbase or pagemaker of multi media there are some multi media and digital television products out there already albeit not as capable as do s but are there compelling reasons to buy such yet perhaps someone in this news group will write that hit software

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technical help sought hi i am in immediate need for details of various graphics compression techniques so if you know where i could obtain descriptions of algo rithms or public domain source codes for such formats as jpeg gif and fractals i would be immensely grateful if you could share the info with me this is for a project i am contemplating of doing thanks in advance please reply via e mail if possible hbj

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surface normal orientations some rendering programs require that all surface normals point in the same direction ie on a closed cube all normals point outwards you can use the points on the faces to determine the direction of the normal by making sure that all points are either in clockwise or counter clockwise order how do you go about orienting all normals in the same direction given a set of points edges and faces say that you had a cube with all faces that have their normals facing outwards except for one face what s the best way to realize that face is flipped and should have it s points re ordered i thought i had a good way of telling this but then realized that the algorithm i had would only tell you if you had points in clockwise order for a d polygon i d like something for d data any hints tips references would be appreciated steve where humor is concerned there are no standards no one can say what is good or bad although you can be sure that everyone will john kenneth galbraith these opinions are my own

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re graphics library package wgt is the wordup graphics toolkit designed by yours truly and my co programmer and brother chris egerter it is a turbo borland c graphics library for programming in vga we are currently producing it as shareware but in a few years it may be a commercial product excuse typos there s no backspace on this terminal features include loading and saving bit images called blocks from herein flipping resizing and warping blocks loading and saving palette fading several in memory at once graphics primitives such as line circle bar rectangle region fill not the usually useless floodfill sprites animated bitmaps up to onscreen at once joystick mouse support sb support voc and cmf tile based game creation using pixel tiles to create a tile map or game world like in duke nuke em number of sprites increased to professional sprite creator utility and map maker routines to simplify scrolling games using maps etc fli playing routines sprites can be animated over the fli while playing pcx support soon gif ems xms coming soon as well leave e mail to barry egerter at egerter obelix gaul csd uwo ca files available on use mget wgt zip simtel and mirrors pd msdos turbo c nic funet fi pub msdos games programming some sites may not have recent files contact me for info regarding the up to date information

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re signature image database contact signaware corp original memo bcc vincent wall from imaging club subject signature verification date sent sci image processing from yyqi ece arizona edu yingyong qi subject signature image database organization u of arizona electrical and computer engineering hi all could someone tell me if there is a database of handwriting signature images available for evaluating signature verification systems thanks yy

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re surface normal orientations in article apr cis uab edu sloan cis uab edu kenneth sloan writes a brilliant algorithm not seriously it s correct up to a sign change the flaw is obvious and will therefore not be shown sorry about that kenneth sloan computer and information sciences sloan cis uab edu university of alabama at birmingham a campbell hall uab station fax birmingham al

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re genoa blitz hits x x ni i am sorry but this genoa card does nothing that the ati ultra plus mb can t do plus the ati costs us street price

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re surface normal orientations in article pscti aqe travis csd harris com srp travis csd harris com stephen pietrowicz writes how do you go about orienting all normals in the same direction given a set of points edges and faces look for edge inconsistencies consider two vertices p and q which are connected by at least one edge if p q is an edge then q p should not appear if both p q and q p appear as edges then the surface flips when you travel across that edge this is bad assuming warning warning warning that you have an otherwise acceptable surface you can pick an edge any edge and traverse the surface enforcing consistency with that edge pick an edge p q and mark it as ok for each face f containing this edge if more than oops make sure that all edges in f are consistent i e the face should be p q q r r s s t t p flip those which are wrong mark all of the edges in f as ok and add them to a queue check for duplicates and especially inconsistencies don t let the queue have both p q and q p remove an edge from the queue and go to if a marked edge is discovered to be inconsistent then you lose if step finds more than one face sharing a particular edge then you lose otherwise when done all of the edges will be consistent which means that all of the surface normals will either point in or out deciding which way is out is left as an exercise kenneth sloan computer and information sciences sloan cis uab edu university of alabama at birmingham a campbell hall uab station fax birmingham al

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re surface normal orientations in pscti aqe travis csd harris com srp travis csd harris com stephen pietrowicz writes how do you go about orienting all normals in the same direction given a set of points edges and faces this algorithm works well for me algorithm to attempt to find outward facing normals first mark all faces as unknown then create an edge dictionary that allows you to find all of the faces sharing a given edge where an edge is two integers representing the two shared vertices pick an arbitrary face and mark it counter clockwise using the edge dictionary orient all surrounding faces based on the orientation of this face and recurse for all surrounding faces consistently orienting the entire surface find the average of the vertices in this surface using that point calculate a volume measurement taking into account the face s orientation if the volume turns out to be positive assume the faces are oriented correctly if it is negative reverse their orientations mark them clockwise if any faces are still unknown after this choose another face and go through the algorithm again at the end faces marked clockwise must have their indices reversed before facet normals are found note if you are running on silicon graphics machines and buy the iris inventor d toolkit developers package you have the source to this algorithm see usr src inventor tools ivnorm if you re not sorry i can t give out the source and even if i could it relies heavily on inventor gavin gavin sgi com

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re million vs thousand colors andrey cco caltech edu andre t yew writes d hh dtek chalmers se henrik harmsen writes bits per r g b gives horrible machbanding visible in almost any picture bits per r g b colors gives visible machbanding color gradient picture has almost no machbanding this color resolution is see some small machbanding on the smooth color gradient picture but all in all there are situiations where you get visible mach banding even in a bit card if you create a very smooth color gradient of dark green white yellow or something and turn up the contrast on the monitor you will probably see some mach banding while i don t mean to damn henrik s attempt to be helpful here he s using a common misconception that should be corrected mach banding will occur for any image it is not the color quantization you see when you don t have enough bits it is the human eye s response to transitions or edges between intensities the result is that colors near the transistion look brighter on the brighter side and darker on the darker side andre yeah of course the term mach banding was not the correct one it should ve been color quantization effect although a bad color quantization effect could result in some visible mach bands on a picture that was smooth before it was quantizised henrik harmsen internet d hh dtek chalmers se chalmers university of technology sweden i haven t lost my mind it s backed up on tape somewhere

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re real time graphics in article apr falcon aamrl wpafb af mil dsnyder falcon aamrl wpafb af mil writes in article c va r kk taurus cs nps navy mil stockel oahu oc nps navy mil jim stockel writes hi opps typed in the phone numbers wrong here are the correct numbers for a commerical package try wave from precision visuals for a free package try khoros from university of new mexico ftp from ptrg eece unm edu login in anonyomus or ftp with a valid email address as the password cd pub khoros release

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iges viewer for dos windows anybody know of an iges viewer for dos windows i need to be able to display computervision iges files on a pc running windows thanks in advance brian h safford email bsaffo cad gmeds com electronic data systems phone note the views and opinions expressed herein are mine and do not reflect those of electronic data systems corp

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computer graphics to vcr help my friend and i have a class project in which we are trying to make a computer animated movie of sorts with the disney animation and would like to put what we have on a vcr is this possible is it easy and relatively cheap if so how we both have ibm compatibles but are relatively clueless with computers if you could help please do thanx brant ritter moshing a cosmic cesspool of physical delight a kiedas rhcp

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stereoscopic imaging i am interested in any information on stereoscopic imaging on a sun workstation for the most part i need to know if there is any hardware available to interface the system and whether the refresh rates are sufficient to produce quality image representations any information about the subject would be greatly appreciated thanks

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re fractals what good are they in article pdxgate uucp idr rigel cs pdx edu ian d romanick writes one thing a small change in initial conditions can cause a huge change in final conditions there are certain things about the way the plate tektoniks and volcanic activity effect a land scape that is while not entirely random unpredictable this is also true with fractals so one could also conclude that you could model this fractally yeah and it s also true most long complicated sequences of events calculations or big computer programs in general i don t argue that you can get similar and maybe useful results from fractals i just question whether you should the fractal fiends seem to be saying that any part of a system that we can t model should be replaced with a random number generator that has been useful for instance in making data more palatable to human perception or for torture testing the rest of the system but i don t think it has much to do with fractals and i certainly would rather that the model be improved in a more explicable manner i guess i just haven t seen all these earth shaking fractal models that explain and correlate to the universe as it actually exists i really hope i do but i m not holding my self similar breath there is one other thing that fractals are good for fractal image compression uh huh i ll believe it when i see it i ve been chasing fractal compression for a few years and i still don t believe in it if it s so great how come we don t see it competing with jpeg cause it can t i ll wager actually i have wagered i quit trying to make fractal compression work and i was trying because i don t think it s a reasonable alternative to other techniques it is neat though i ll reiterate my disbelief that everything is fractal that s why i don t think fractal compression as it is widely explained is practical i know barnsley and sloan have some tricks up their sleeves that make their demos work but i don t see anyone using it in a real product it s been six years since iterated systems was formed right there are always going to be questions until there s a product out there sloan replies the company plans to ship its first encoding devices in the summer he says in march iterated systems will have the other half of the system the decoders scientific american march page allen b don t even get me started

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complex i e with real and imaginary parts bio medical images are complex bio medical images available anywhere on the net for experimentation by complex i mean that every sampled data point has a magnitude and phase information both thanks for any pointers vishwa

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mpeg for ms dos does anyone know where i can ftp mpeg for dos from thanks for any help in advance email is preferred but posting is fine scott lord soth knight email to lordsoth uiuc of the black rose next to sas sumter cso uiuc edu i have no clue what i want to say in here so i won t say anything

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help i need a complete list of all the polygons that there are in order i ll summarize to the net if only i had been compiled with the g option

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re help colors display in c you ll probably have to set the palette up before you try drawing in the new colours use the bios interrupt calls to set the r g b values in the range from for most cards for a particular palette colour in the range from for colour modes then you should be able to draw pixels in those palette values and the result should be ok you might have to do a bit of colourmap compressing if you have more than unique rgb triplets for a colour mode geoff thomas geoffrey cosc canterbury ac nz computer science dept university of canterbury private bag christchurch oook new zealand

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re rumours about do stgprao st unocal com richard ottolini writes they need a hit software product to encourage software sales of the product i e the pong pacman visicalc dbase or pagemaker of multi media there are some multi media and digital television products out there already albeit not as capable as do s but are there compelling reasons to buy such yet perhaps someone in this news group will write that hit software i ve just had the good fortune to be hired by electronic arts as senior computer graphics artist at the vancouver canada office the timing has a lot to do with the do which ea is putting a lot of resources into i do not know of any titles to be developed as yet but will be happy to post as things develop i start there may markus tessmann

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re quicktime movie available in article johnsh mustang stu rpi edu i wrote i ve used the recently released macintosh application mpeg to quicktime to convert the excellent mpeg canyon mpg into a quicktime movie while anyone who would want this movie is perfectly able to convert it themselves i thought i d let the net know that i d be glad to mail copies of mine out the movie conversion took close to six hours on my poor little iicx in other words unless you ve got a quadra you might not want to tie up your machine in converting this file the movie is a fast fly through of a fractal generated canyon landscape the movie is seconds long and uses the compact video compressor i e quicktime v the movie looks okay on bit displays and looks absolutely awesome on and bit displays i d be happy to mail this movie to the first or so people who ask for it the only caveat is you need to be able to receive a nine megabyte mail message the movie was stuff it ed down to seven megs but binhex ruined that party if more then people want this movie then it s just more evidence that the net needs a dedicated quicktime ftp archive site c mon someone s gotta have a spare gb drive out there okay i ve received a whole lot of requests for the movie so for simplicity s sake i can t mail out any more than i ve already received as of edt tuesday maybe it ll pop up on a site sooner or later hugh johnson johnsh rpi edu rensselaer polytechnic institute welcome to macintosh troy new york usa

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qc msc code to view save images dear binary newsers i am looking for quick c or microsoft c code for image decoding from file for vga viewing and saving images from to gif tiff pcx or jpeg format i have scoured the internet but its like trying to find a dr seuss spell checker tsr it must be out there and there s no need to reinvent the wheel thanx in advance the internet is like a black hole

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autocad tiff can it be done hello i realize that this might be a faq but i have to ask since i don t get a change to read this newsgroup very often anyways for my senior project i need to convert an autocad file to a tiff file please i don t need anyone telling me that the autocad file is a vector file and the tiff is a bit map since i have heard that about times already i would just like to know if anyone knows how to do this or at least point me to the right direction any help greatly appreciated matt georgy

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gamma law correction hi i am digitizing a ntsc signal and displaying on a pc video monitor it is known that the display response of tubes is non linear and is sometimes said to follow gamma law i am not certain if these non linearities are gamma corrected before encoding ntsc signals or if the tv display is supposed to correct this also if grey levels for example are coded in a c program do these intensity levels appear with linear brightness on a pc monitor in other words does pc monitor display circuitry correct for gamma errrors your response is much appreciated amjad amjad soomro ccs computer science center u of maryland at college park email amjad wam umd edu

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mpeg for x windows mono needed hello and thank you for reading this request i have a mpeg viewer for x windows and it did not run because i was running it on a monochrome monitor i need the mono driver for mpeg play please post the location of the file or better yet e mail me at mlee eng sdsu edu

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re thining algorithm in article q innmi shelley u washington edu kshin stein u washington edu kevin shin writes i am trying obtain program to preprocess handwriting characters like thining algorithm graph alogrithm do anyone know where i can obtain those i usually use algorithms for graphics and image processing by theodosios pavlidis but other people here got them same idea and now of copies in the libraries have been stolen another reference is digital image processing by gonzalez and wintz wood which is widely available but a little expensive here i just checked today ab

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re tiff philosophical significance of in article apr galki toppoint de ulrich galki toppoint de writes according to the tiff specification the tiff version number bytes has been chosen for its deep philosophical significance last week i read the hitchhikers guide to the galaxy is this actually how they picked the number i m sure it is and i am not amused every time i read that part of the tiff spec it infuriates me and i m none too happy about the complexity of the spec anyway because i think their arbitrary but carefully chosen number is neither additionally i find their choice of bytes to begin a file with meaningless of themselves why not just use the letters tiff and no i don t think they should have bothered to support both word orders either and i ve found that many tiff readers actually don t ab

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re vga x graphics mode gchen essex ecn uoknor edu writes in article c doh ai constellation ecn uoknor edu greetings does anybody know if it is possible to set vga graphics mode to x instead of x any info is appreciated some vesa bios s support this mode x and any vga should be able to support this x by colors since it only requires bytes my a vesa tsr supports this it s the only vesa mode by card can support due to a restrictions a wd paradise i am not responsible for anything i do or say i m just an opinion robert j c kyanko rob rjck uucp

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re weitek p abraxis iastate edu writes in article abraxis class iastate edu anyone know about the weitek p graphics chip micron is selling it with their systems they rank them at winmarks any info would help thanks it s supposedly a high performance chip based upon workstation graphics accelerators it s quite fast i have but as usual with new boards chips the drivers are buggy for windows as far as winmarks go it depends upon the version i think i got m winmarks with version yielded the number i ve also benchmarked this with wintach at over from memory as well as far as the low level stuff goes it looks pretty nice it s got this quadrilateral fill command that requires just the four points it s very fast but beware of buggy drivers and otherwise no non windows support i am not responsible for anything i do or say i m just an opinion robert j c kyanko rob rjck uucp

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re delaunay triangulation in article lsk v inn c caspian usc edu zyeh caspian usc edu zhenghao yeh writes does anybody know what delaunay triangulation is is there any reference to it is it useful for creating d objects if yes what s the advantage it is used to create a tin triangulated irregular network which is basically a bunch of triangles which form a surface over a group of points what is special about it is that the triangles formed are the most equalateral possible check out proceedings of autocarto n where n is sorry i don t have a specific reference describing the process michael

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graphic formats i am writing some utilies to convert regis and tektonic esacpe sequences into some useful formats i would rather not have to goto a bitmap format i can convert them to window meta files easily enough but i would rather convert them to corel draw cdr or ms power point ppt files microsoft would not give me the format i was wondering if anybody out there knows the formats for these two applications

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re nice gif code there is a thing called xgif xgif is the grandfather of xv

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re rumours about do archer archer bad cop surly archer elysium esd sgi com archer how about interactive sex with madonna or sexium for short lars lars fischer fischer iesd auc dk it takes an uncommon mind to think of cs dept aalborg univ denmark these things calvin

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re forms for curses note the followup to header steelem rintintin colorado edu steele mark a writes is there a collection of forms routines that can be used with curses if so where is it located on my svr amiga unix box i ve got lform lmenu and lpanel for use with the curses library guess what they provide unix press ie prentice hall has a programmer s guide for these tools referred to as the fmli forms mgmt language interface and eti extended terminal interface now in it s nd edition it is isbn paraphrased from the outside back cover fmli is a high level programming tool for creating menus forms and text frames eti is a set of screen management library subroutines that promote fast development of application programs for window panel menu and form manipulation the fmli is a shell package which reads ascii text files and produces screen displays for data entry and presentation it consists of a shell like environment of the fmli program and it s database files it is section f in the unix press manual the eti are subroutines part of the x manual section provide support for a multi window capability on an ordinary ascii terminal with controls built on top of the curses library thanks mark steele steelem rintintin colorado edu frank crash edwards edwards edwards consulting voice crash ckctpa myrddin sybus com but please data don t ask uunet to route it it s sloooow there will be times in life when everyone you meet smiles and pats you on the back and tells you how great you are so hold on to your wallet

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re trying to view pov files merkelbd sage cc purdue edu brian merkel writes in article apr ornl gov ednobles sacam oren ortn edu edward d nobles writes i ve been trying to view tga files created in povray i have the diamond speedstar video board not the x so far i can convert them to jpeg using cjpeg and view them with cview but that only displays bit color i m looking for some way to convert and or view them in bit i have univesa uvesa zip and the dvpeg viewer but i don t get anything perhaps i am not setting up univesa properly if anyone has ideas about this please feel free to enlighten me just want to see the darn things in real color image alchemy aka alchemy will view the tga files that pov outputs and just about any other format you can think of it will also convert between all these it s shareware so it s probably available by ftp somwhere out there in netland yep alchemy works fine on my tseng dac but i think i remember reading that it only displays in bit or so of course that s still k colors which is nothing to sneeze at use the v flag neal miller why not go mad millernw craft camp clarkson edu clarkson university ford prefect dark craft camp clarkson edu

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hot new d software there is a new product for the ibm ers out there it is called imagine and it just started shipping yesterday i can personally attest that it will blow the doors off of d studio it is made by impulse and is in its rd version st for the ibm it can do morphing your standard key framming animation it is a raytracer reflections shadows and can do apply special fx to objects like ripple explode bounce things of that nature also it has algorithmic texture maps and your standard brushmapping also you can have animated brushmaps ie live video mapped on the objs also animated backdrops ie live video backgrounds also animted reflections maps you get the idea it will run for about retail i think dont let the low price fool you this product can do it all when it comes to d animation and renderering also does anyone here know how to get in the imagine mailing list please e mail me if you do or post up here oh the number for impulse is trb ra msstate edu

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re hot new d software in a previous article trb ra msstate edu tony r boutwell says there is a new product for the ibm ers out there it is called imagine and it just started shipping yesterday i can personally attest that it will blow the doors off of d studio it is made by impulse and is in its well i don t know about its competing with d studio but it s pretty powerful allright also does anyone here know how to get in the imagine mailing list please e mail me if you do or post up here yes send e mail to imagine request email sp paramax com with a header of something like subscribe i actually work on the faq frequently asked questions we should have the new version out of it by next week but if you want i could e mail you the previous one it details what the list is etc as well as answering basic questions about imagine hope this helps michael b comet software engineer graphics artist cwru mbc po cwru edu silence those who oppose the freedom of speech

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re vga x graphics mode in article snx rjck uucp rob rjck uucp robert j c kyanko writes gchen essex ecn uoknor edu writes in article c doh ai constellation ecn uoknor edu greetings does anybody know if it is possible to set vga graphics mode to x instead of x any info is appreciated some vesa bios s support this mode x and any vga should be able to support this x by colors since it only requires bytes my a vesa tsr supports this it s the only vesa mode by card can support due to a restrictions a wd paradise i am not responsible for anything i do or say i m just an opinion robert j c kyanko rob rjck uucp ahh no possibly you punched in the wrong numbers on your calculator color modes take a byte per pixel so time is which is k to be exact x x only takes k but i don t think it is a bios mode i wouldn t bet that all vga cards can do that either if a vga card has k i bet it can do both x and x that by definition is svga though not very high svga

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tin files coutours hi i am working on a project that needs to create contour lines from random data points the work that i have done so far tells me that i need to look into triangulated irregular networks tin the delauney criiterion and the krige method does anyone have any suggestions for references programs and hopefully source code for creating contours any help with this or any surface modeling would be greatly appreciated i can be reached at the addresses below paul conway pvconway copper denver colorado edu pvconway cudnvr denver colorado edu

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apr toronto siggraph event toronto siggraph what chance s art d graphics and animation on the indigo by ken evans imagicians artware inc when tuesday april pm pm where the mcluhan centre for culture and technology university of toronto a queen s park crescent toronto who members and non members alike non members encouraged to become members abstract imagicians artware inc is entering into early beta site testing on silicon graphics workstations of a new d abstract artwork and animation package called chance s art the package will be described and demonstrated and some of the technical issues will be discussed marketing plans will be outlined the talk will also present some of the technical and business problems increasingly confronting small startup software companies today and some of the opportunities this situation presents time after the event will be allocated for hands on demonstrations to interested parties silicon graphics is graciously providing an indigo for this event myck kupka will also be demonstrating his computerized interactive reflective stereoscope which is installed upstairs in the mcluhan centre so feel free to drop by for a demonstration before or after the event btw be sure to sing happy birthday myck the names of nominees for our siggraph executive offices will be announced at this meeting nominations will still be open until the election at our may th event call myck kupka at or fax to directions the mcluhan coachhouse is on the east side of queen s park crescent just north of wellesley south of st joseph st behind east of queen s park crescent which is the centre for mediaeval studies for information on toronto siggraph membership contact michael mccool via internet mccool dgp utoronto ca voice fax

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re delaunay triangulation zyeh caspian usc edu zhenghao yeh writes does anybody know what delaunay triangulation is is there any reference to it the delaunay triangulation is the geometrical dual of the voronoi tessellation and both constructions are derived from natural neighbor order aurenhammer f voronoi diagrams a survey of a fundamental geometric data structure acm computing surveys p okabe a boots b and sugihara k spatial tessellations concepts and applications of voronoi diagrams wiley sons new york isbn p watson d f computing the n dimensional delaunay tessellation with application to voronoi polytopes the computer j p watson d f natural neighbour sorting the australian computer j p dave watson internet watson maths uwa edu au department of mathematics the university of western australia tel nedlands wa australia fax

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ansi aiim ms standard image file format wing the suggestion of stu lynne i have posted the image file format executable and source code to alt sources herman silbiger

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re trying to view pov files in article apr ornl gov ednobles sacam oren ortn edu edward d nobles writes i ve been trying to view tga files created in povray i have the diamond speedstar video board not the x so far i can convert them to jpeg using cjpeg and view them with cview but that only displays bit color i m looking for some way to convert and or view them in bit just want to see the darn things in real color thanks jim nobles the best program i ve seen for viewing such files is vpic you ll want version or later x is current it allows you to view in and bit modes it really is quite nice now for a return question do you run windows if so what are the dates on your drivers the newest ones i can find are from around my problem is they conflict with star trek after dark and other things as well i m willing to bet that it s the drivers and not the programs anyone out there have info on newer ss not x drivers for windows or os thanks justin

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re looking for circle algorithm faster than bresenhams in article apr nwnexus wa com mpdillon halcyon com michael dillon writes i have an algorithm similar to bresenhams line drawing algorithm that draws a line by stepping along the minor axis and drawing slices like aaaa bbbb cccc in the following diagram aaaa bbbb cccc yes that s known as bresenhams run length slice algorithm for incremental lines see fundamental algorithms for computer graphics springer verlag berlin heidelberg i have tried to extrapolate this to circles but i can t figure out how to determine the length of the slices any ideas hmm i don t think i can help you with this but you might take a look at the following double step incremental generation of lines and circles x wu and j g rokne computer graphics and image processing vol no mar pp double step generation of ellipses x wu and j g rokne ieee computer graphics applications may pp graeme gill

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e mail of michael abrash

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fonts in pov i have seen several ray traced scenes from mtv or was it rayshade with stroked fonts appearing as objects in the image the fonts chars had color depth and even textures associated with them now i was wondering is it possible to do the same in pov thanks noel

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polygon reduction for marching cubes dear reader i am searching for an implementation of a polygon reduction algorithm for marching cubes surfaces i think the best one is the reduction algorithm from schroeder et al siggraph so is there any implementation of this algorithm it would be very nice if you could leave it to me also i am looking for a fast connectivity test for marching cubes surfaces any help or hints will be very useful thanks a lot o o ooo ooo erwin keeve adress peter welter platz w cologne germany dept of computergraphics phone computeranimation fax academy of media arts cologne email keeve khm uni koeln de

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dmpeg zip info another dos mpeg decoder player posted i have posted a dos mpeg decoder player to alt binaries pictures utilities here is a short description and some technical information taken from the accompanying documentation dmpeg v public domain mpeg decoder by stefan eckart features dmpeg dmplay is another mpeg decoder player for the pc decodes nearly the full mpeg video standard i p b frames frame size up to at least x supported saves decoded sequence in or bit raw file for later display optional on screen display during decoding requires vga several dithering options ordered dither floyd steinberg grayscale color space selection runs under dos kb ram no ms windows required very compact small code small data models bit arithmetic real time display of the raw file by a separate player for vga and many super vgas technical information the player is a rather straightforward implementation of the mpeg spec the idct is based on the chen wang multiplication algorithm not quite the optimum i know blocks with not more than eight non zero coefficients use a non separated direct multiply accumulate d idct sounds great doesn t it which turned out to be faster than a fast algorithm in this quite common case dithering is pretty standard main difference to the berkeley decoder except for the fewer number of supported algorithms is the use of instead of colors the default option to use a restricted color space and the implementation of a color saturation dominant ordered dither this leads to a significantly superior quality of the dithered image i claim judge yourself restricted color space means that the u and v components are clipped to instead of and the display color space points are distributed over this restricted space since the distance between color space points is thus reduced by a factor of two the color resolution is doubled at the expense of not being able to represent fully saturated colors saturation dominant ordered dither is a method by which a color lying somewhere between the points of the display color space is approximated by primarily alternating between two points of constant hue instead of constant saturation this yields subjectivly better quality due to the lower sensitivity of the human viewing system to saturation changes than to hue changes the same reasoning as used by the pal tv standard to improve on ntsc the improvement is particularly visible in dark brown or redish areas stefan eckart stefan lis e technik tu muenchen de

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point within a polygon i am looking for an algorithm to determine if a given point is bound by a polygon does anyone have any such code or a reference to book containing information on the subject regards simon

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pov reboots pc after memory upgrade up until last week i have been running povray v on my under dos without any major problems over easter i increased the memory from meg to meg and found that povray reboots the system every time under dos i had a go at running povray in a dos window when running win on the same system and it now works fine even if a lot slower i would like to go back to using povray directly under dos anyone any ideas john john heaton nrs central administrator mcc network unit the university oxford road manchester m pl phone fax packet g yyh g yyh gb pwy gbr eu

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good shareware paint and or animation software for sgi does anyone know of any good shareware animation or paint software for an sgi machine i ve exhausted everyplace on the net i can find and still don t hava a nice piece of software thanks alot chad knock knock chad cipiti who s there af cleveland freenet edu cipiti bobcat ent ohiou edu it might be heisenberg chad voxel zool ohiou edu

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processing of stereo images i m interested in find out what is involved in processing pairs of stereo photographs i have black and white photos and would like to obtain surface contours i d prefer to do the processing on an sgi but would be interested in hearing what software hardware is used for this type of image processing please email and or post to comp sys sgi graphics your responses thanks dane hendrix email dane wizard dt navy mil dtmb a k a headquarters carderock div or hendrix oasys dt navy mil naval surface warfare center or hendrix nas nasa gov code bethesda md phone

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re weitek p robert j c kyanko rob rjck uucp wrote abraxis iastate edu writes in article abraxis class iastate edu anyone know about the weitek p graphics chip as far as the low level stuff goes it looks pretty nice it s got this quadrilateral fill command that requires just the four points do you have weitek s address phone number i d like to get some information about this chip joe green harris corporation jgreen csd harris com computer systems division the only thing that really scares me is a person with no sense of humor jonathan winters

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sun os and bit ascii graphics i would like to know if anyone has had any luck using the upper ascii characters on a sun station i am trying to convert a fortran program to run on a sun when we write character buffers to the sun which contain char or char or char etc we get characters on the screen but they are not the characters in the standard ascii tables any ideas or help will be appreciated

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re looking for circle algorithm faster than bresenhams on wed apr gmt graeme labtam labtam oz au graeme gill said graeme yes that s known as bresenhams run length slice algorithm for graeme incremental lines see fundamental algorithms for computer graphics graeme springer verlag berlin heidelberg i have tried to extrapolate this to circles but i can t figure out how to determine the length of the slices any ideas graeme hmm i don t think i can help you with this but you might graeme take a look at the following graeme double step incremental generation of lines and circles graeme x wu and j g rokne computer graphics and image processing graeme vol no mar pp graeme double step generation of ellipses x wu and j g rokne graeme ieee computer graphics applications may pp another paper you might want to consider is article fungdraw title a run length slice line drawing algorithm without division operations author khun yee fung and tina m nicholl and a k dewdney journal computer graphics forum year volume number pages c c khun yee khun yee fung clipper csd uwo ca department of computer science middlesex college university of western ontario london ontario canada n a b tel fax

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geometry package i am looking for a package which takes as inputs a set of geometric objects defined by unions of convex polytopes specified in some manner say by inequalities and equalities and determines in some reasonable form things like intersections unions etc etc does anyone know where i can find such a thing dan naiman department of mathematical sciences johns hopkins university

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re point within a polygon in article apr uk bull co uk scrowe hemel bull co uk simon crowe writes i am looking for an algorithm to determine if a given point is bound by a polygon does anyone have any such code or a reference to book containing information on the subject see the article an efficient ray polygon intersection p in graphics gems isbn the second step intersecting the polygon does what you want there is sample code in the book spl steve lamont sciviguy spl szechuan ucsd edu san diego microscopy and imaging resource uc san diego la jolla ca they are not bolsheviks just bullshitviks yevgeny yevtechenko again a meeting

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re distance between two bezier curves pes hutcs cs hut fi pekka siltanen writes suppose two cubic bezier curves control points v v and w w which have equal first and last control points v w v w how do i get upper bound for distance between these curves which distance the distance between one point t ti on the first curve and a point on the other curve with same parameter u ti any references appreciated thanks in anvance pekka siltanen

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re point within a polygon scrowe hemel bull co uk simon crowe writes i am looking for an algorithm to determine if a given point is bound by a polygon does anyone have any such code or a reference to book containing information on the subject well it s been a while since this was discussed so i take the liberty of reprinting without permission so sue me eric haines reprint of the very interesting discussion of this topic jonas o o x snip snip x o o give a man a fish and he ll eat one day give a man a fishing rod and he ll laze around fishing and never do anything with that in mind i reprint without permission so sue me relevant information posted some years ago on this very problem note the early use of postscript technology predating many of this year s papers listed in the april st siggraph program announcement posted here a few days ago eric intersection between a line and a polygon undecidable by dave baraff tom duff from deb charisma graphics cornell edu newsgroups comp graphics keywords p np jordan curve separation ursyhon metrization theorem organization program of computer graphics in article ncsmith ndsuvax uucp timothy lyle smith writes i need to find a formula algorithm to determine if a line intersects a polygon i would prefer a method that would do this in as little time as possible i need this for use in a forward raytracing program i think that this is a very difficult problem to start with lines and polygons are semi algebraic sets which both contain uncountable number of points here are a few off the cuff ideas first we need to check if the line and the polygon are separated now the jordan curve separation theorem says that the polygon divides the plane into exactly two open and thus non compact regions thus the line lies completely inside the polygon the line lies completely outside the polygon or possibly but this will rarely happen the line intersects the polyon now the phrasing of this question says if a line intersects a polygon so this is a decision problem one possibility the decision model approach is to reduce the question to some other well known problem q and then try to solve q an answer to q gives an answer to the original decision problem in recent years many geometric problems have been successfully modeled in a new language called postscript see postscript language by adobe systems incorporated isbn co so given a line l and a polygon p we can write a postscript program that draws the line l and the polygon p and then outputs the answer by output we mean the program executes a command called showpage which actually prints a page of paper containing the line and the polygon a quick examination of the paper provides an answer to the reduced problem q and thus the original problem there are two small problems with this approach there is an infinite number of ways to encode l and p into the reduced problem q so we will be forced to invoke the axiom of choice or equivalently zorn s lemma but the use of the axiom of choice is not regarded in a very serious light these days more importantly the question arises as to whether or not the postscript program q will actually output a piece of paper or in other words will it halt now postscript is expressive enough to encode everything that a turing machine might do thus the halting problem for postscript is undecidable it is quite possible that the original problem will turn out to be undecidable i won t even begin to go into other difficulties such as aliasing finite precision and running out of ink paper or both a couple of references might be principia mathematica newton i cambridge university press cambridge england sorry i don t have an isbn for this an introduction to automata theory languages and computation hopcroft j and ulman j the c programming language kernighan b and ritchie d a tale of two cities dickens c from td alice uucp tom duff summary overkill organization at t bell laboratories murray hill nj the situation is not nearly as bleak as baraff suggests he should know better he s hung around the labs for long enough by the well known dobbin dullman reduction see j dullman d dobbin j comp obfusc ii pp lemma a line polygon intersection can be reduced to hamiltonian circuit without the use of grobner bases so lpi to coin an acronym is probably only np complete besides turing completeness will no longer be a problem once our cray is delivered since it will be able to complete an infinite loop in milliseconds with scatter gather from deb svax cs cornell edu david baraff well sure its no worse than np complete but that s only if you restrict yourself to the case where the line satisfies a lipschitz condition on its second derivative i think there s an siggraph paper from caltech that deals with this j o n a s y n g v e s s o n email jonas y isy liu se dept of electrical engineering voice university of linkoping sweden fax

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re point within a polygon in article apr uk bull co uk scrowe hemel bull co uk simon crowe writes i am looking for an algorithm to determine if a given point is bound by a polygon does anyone have any such code or a reference to book containing information on the subject regards simon basically there are two algorithms determining whether a point is inside outside or on the polygon the first one is ray or half line method in this method you can draw any ray if the number of the intersection point of the ray and the polygon is even then it is outside if the number is odd then it is inside of cause you have to deal with the special cases which may make you headache the second method is pi algorithm draw the lines between the point and all the vertices on the polygon calculate and sum the angles of the successive lines if the result is pi then it is inside if pi then it is on the polygon otherwise it is outside my experience tells the second method is relible hope this helps yeh usc

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re two pointing devices in one com port bob davis sonny trantor harris atd com wrote in article c tkgm v unix portal com wil shell portal com ville v walveranta writes is there any way to connect two pointing devices to one serial port i haven t tried this but i believe they would interfere with each other even if only one at a time would be used just get an a b switch for rs look in computer shopper they are available fairly cheap they allow switching between two serial devices on a single port unfortunately the poster wants to use an internal and an external modem so a switch isn t going to help them if you aren t using your com ports for anything else just define them on different com ports define your internal modem to be say com and your external modem to be com you really shouldn t have to worry about interrupt conflicts since you won t be using both modems at the same time christopher chan nui investment in reliability will increase until it channui austin ibm com exceeds the probable cost of errors or until someone include disclaimer h insists on getting some useful work done

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re fractals what good are they in article pdxgate uucp idr rigel cs pdx edu ian d romanick writes they talked about another routine that could yield up to to compress with no image loss that i could notice the draw back is that it takes a hell of a long time to compress something i ll have to see if i can find the book so that i can give more exact numbers ttyl that s a typical claim though they say they ve improved compression speed considerably did you find out anything else about the book i d be interested in looking at it if you could give me any pointers reportedly early fractal compression times of hours used that marvelous piece of hardware called grad students to do the work supposedly it s been automated since about but i m still waiting to be impressed allen b sign me cynical

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re bgi drivers for svga dominic lai cs cylai cs ust hk wrote simon crowe scrowe hemel bull co uk wrote i require bgi drivers for super vga displays and super xvga displays does anyone know where i could obtain the relevant drivers ftp sites i would like to know too regards dominic garbo uwasa fi or one of its many mirrors has a file called svgabg in the programming subdirectory these are svga bgi drivers for a variety of cards from the readme card types supported supervga drivers ahead ati chips tech everex genoa paradise oak trident both and tseng both and chipsets and video these drivers will also work on video cards with vesa capability the tweaked drivers will work on any register compatible vga card enjoy clark verbrugge clump cs mcgill ca honk honk blat wak wak wak wak wak ungow

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re tiff philosophical significance of in article hc mentor cc purdue edu ab nova cc purdue edu allen b writes in article apr galki toppoint de ulrich galki toppoint de writes according to the tiff specification the tiff version number bytes has been chosen for its deep philosophical significance last week i read the hitchhikers guide to the galaxy is this actually how they picked the number i m sure it is and i am not amused every time i read that part of the tiff spec it infuriates me and i m none too happy about the complexity of the spec anyway because i think their arbitrary but carefully chosen number is neither additionally i find their choice of bytes to begin a file with meaningless of themselves why not just use the letters tiff and no i don t think they should have bothered to support both word orders either and i ve found that many tiff readers actually don t ab why so up tight for that matter tiff is out now so why not gripe about its problems also if its so important to you volunteer to help define or critique the spec finally a little numerology is backwards and tiff is a bit image format chris christopher p tully cptully med unc edu univ of north carolina chapel hill cb chapel hill nc i get paid for my opinions but that doesn t mean that unc or anybody else agrees with them

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interleaf to cgm has anyone successfully converted interleaf graphics to cgm or even heard of it being done we d love to hear about it mike mcconnell emm cray com

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re hollywood hits virtual reality sorry i missed you raymond i was just out in dahlgren last month i m the virtual reality market manager for silicon graphics so perhaps i can help a little in article mar relay nswc navy mil rchui nswc wo nswc navy mil raymond chui writes hello the real reality our agency started to express interest in virtual reality vr so far we do not know much about vr all we know about are the hollywood movies the terminater and lawnmover man we also know something about vr from abc news magazine and computer graphics world magazine unfortunately while sgi systems were used to create the special effects for both terminator and lawnmower man those are film quality computer graphics rendered in software and written to film a frame at a time each frame of computer animation for those films took hours to render on high end parallel processing computer systems thus that level of graphics would be difficult if not impossible to acheive in real time frames per second we certainly want to know more about vr who are the leading companies agencies universities what machines support vr i e sgi sun hp bim etc it depends upon how serious you are and how advanced your application is true immersive visualization vr requires the rendering of complex visual databases at anywhere from to newly rendered frames per second this is a similar requirement to that of traditional flight simulators for pilot training if the frame rate is too low the user notices the stepping of the frames as they move their head rapidly around the scene so the motion of the graphics is not smooth and contiguous thus the graphics system must be powerful enough to sustain high frame rates while rendering complex data representations additionally the frame rate must be constant if the system renders frames per second at one point then frames per second the next perhaps due to the scene in the new viewing direction being simpler than what was visible before the user can get heavily distracted by the medium the graphics computer rather than focusing on the data to maintain a constant frame rate the system must be able to run in real time unix in general does not support real time operation but silicon graphics has modified the unix kernel for its multi processor systems to be able to support real time operation bypassing the usual unix process priority management schemes uniprocessor systems running unix cannot fundamentally support real time operation not sun sparc not hp series systems not ibm rs not even sgi s uniprocessor systems like indigo or crimson only our multiprocessor onyx and challenge systems support real time operation due to their symmetric multi processing smp shared memory architecture from a graphics perspective rendering complex virtual environments requires advanced rendering techniques like texture mapping and real time multi sample anti aliasing of all of the general purpose graphics systems on the market today only crimson realityengine and onyx realityengine systems fully support these capabilities the anti aliasing is particularly important as the crawling jagged edges of aliased polygons is an unfortunate distraction when immersed in a virtual environment what kind of graphics languages are used with vr gl opengl phigs pex gks etc you can use the general purpose graphics libraries listed above to develop vr applications but that is starting at a pretty low level there are off the shelf software packages available to get you going much faster being targeted directly at the vr application developer some of the most popular are in no particular order division inc redwood city ca dvs sens inc sausalito ca worldtoolkit naval postgraduate school monterey ca npsnet free gemini technology corp irvine ca gvs simation series paradigm simulation inc dallas tx visionworks audioworks silicon graphics inc mountain view ca iris performer there are some others but not off the top of my head what companies are making interface devices for vr goggles or boom binocular omni orientational monitor hamlets gloves arms etc there are too many to list here but here is a smattering fake space labs menlo park ca boom virtual technologies inc stanford ca cyberglove digital image design new york ny the cricket d input kaiser electro optics carlsbad ca sim eye helmet displays virtual research sunnyvale ca flight helmet display virtual reality inc pleasantville ny head mtd displays s w software systems san jose ca d modeling software etc etc etc what are those company s addresses and phone numbers where we can get a list name of vr experts and their phone numbers and email addresses read some of the vr books on the market virtual reality ken pimental and ken texiera sp virtual mirage artificial reality myron kreuger etc or check out the newsgroup sci virtual worlds feel free to contact me for more info regards josh joshua mogal product manager advanced graphics division advanced graphics systems silicon graphics inc market manager north shoreline blvd virtual reality mountain view ca interactive entertainment m s l tel fax e mail mogal sgi com

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re point within a polygon in article jonas y gouraud jonas y isy liu se jonas yngvesson writes intersection between a line and a polygon undecidable by dave baraff tom duff from deb charisma graphics cornell edu in recent years many geometric problems have been successfully modeled in a new language called postscript see postscript language by adobe systems incorporated isbn co so given a line l and a polygon p we can write a postscript program that draws the line l and the polygon p and then outputs the answer by output we mean the program executes a command called showpage which actually prints a page of paper containing the line and the polygon a quick examination of the paper provides an answer to the reduced problem q and thus the original problem curiously in modern postscript the point in a polygon problem can be solved even more easily to wit title point in polygon creator allen b ab cc purdue edu for the amusement of comp graphics regulars languagelevel documentneededresource humor sense thereof endcomments this program will test whether a point is inside a given polygon currently it uses the even odd rule but that can be changed by replacing ineofill with infill these are level operators so if you ve only got level you re out of luck the result will be printed on the output stream caution only accurate to device pixels put a huge scale in first if you aren t sure point to test put x and y coordinates here vertices of polygon in counter clockwise order put array of pairs of coordinates here dup get aload pop moveto dup length dup roll sub getinterval aload pop lineto forall closepath ineofill yes no ifelse

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virtual reality for x on the cheap hi everyone i thought that some people may be interested in my vr software on these groups announcing the release of multiverse multiverse is a multi user non immersive x windows based virtual reality system primarily focused on entertainment research features client server based model using berkeley sockets no limit to the number of users apart from performance generic clients customizable servers hierachical objects allowing attachment of cameras and light sources multiple light sources ambient point and spot objects can have extension code to handle unique functionality easily attached functionality client the client is built around a fast render loop basically it changes things when told to by the server and then renders an image from the user s viewpoint it also provides the server with information about the user s actions which can then be communicated to other clients and therefore to other users the client is designed to be generic in other words you don t need to develop a new client when you want to enter a new world this means that resources can be spent on enhancing the client software rather than adapting it the adaptations as will be explained in a moment occur in the servers this release of the client software supports the following functionality o hierarchical objects with associated addressing o multiple light sources and types ambient point and spot o user interface panels o colour polygonal rendering with phong shading optional wireframe for faster frame rates o mouse and keyboard input some people may be disappointed that this software doesn t support the powerglove as an input device this is not because it can t but because i don t have one this will however be one of the first enhancements server s this is where customization can take place the following basic support is provided in this release for potential world server developers o transparent client management o client message handling this may not sound like much but it takes away the headache of accepting and terminating clients and receiving messages from them the application writer can work with the assumption that things are happening locally things get more interesting in the object extension functionality this is what is provided to allow you to animate your objects o server selectable extension installation what this means is that you can decide which objects have extended functionality in your world basically you call the extension initialisers you want o event handler registration when you develop extensions for an object you basically write callback functions for the events that you want the object to respond to current events supported init move change collide terminate o collision detection registration if you want your object to respond to collision events just provide some basic information to the collision detection management software your callback will be activated when a collision occurs this software is kept separate from the worldserver applications because the application developer wants to build a library of extended objects from which to choose the following is all you need to make a world server application o provide an initworld function this is where you choose what object extensions will be supported plus any initialization you want to do o provide a positionobject function this is where you determine where to place a new client o provide an installworldobjects function this is where you load the world wld file for a new client o provide a getworldtype function this is where you tell a new client what persona they should have o provide an animateworld function this is where you can go wild at a minimum you should let the objects move by calling a move function and let the server sleep for a bit to avoid outrunning the clients that s all there is to it and to prove it here are the line counts for the three world servers i ve provided generic lines dactyl lines more complicated collision detection due to the stairs will probably be improved with future versions dogfight lines location this software is located at the following site ftp u washington edu directory pub virtual worlds file multiverse tar z futures client o texture mapping o more realistic rendering i e z buffering or similar gouraud shading o hmd support o etc etc server o physical modelling gravity friction etc o enhanced object management interaction o etc etc both o improved comms i hope this provides people with a good understanding of the multiverse software unfortunately it comes with practically zero documentation and i m not sure whether that will ever be able to be rectified i hope people enjoy this software and that it is useful in our explorations of the virtual universe i ve certainly found fascinating developing it and i would love to add support for the powerglove and an hmd finally one major disclaimer this is totally amateur code by that i mean there is no support for this code other than what i out the kindness of my heart or you out of pure desperation provide i cannot be held responsible for anything good or bad that may happen through the use of this code use it at your own risk disclaimer over of course if you love it i would like to here from you and anyone with positive contributions criticisms is also encouraged to contact me anyone who hates it dev null and if anyone wants to let me do this for a living you know where to write thanks robert robert acsc com

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re virtual reality for x on the cheap update on location directory should be public virtual worlds sorry robert robert acsc com

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pcx hello help please i am a student of turbo c and graphics programming and i am having some problems finding algorithms and code to teach me how to do some stuff where is there a book or code that will teach me how to read and write pcx dbf and gif files how do i access the extra ram on my paradise video board so i can do paging in the higher vga modes ie x x x x anybody got a line on a good book to help answer these question thanks very much send reply s to palm snycanva bitnet peace be blessed be stephen palm

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what s a good assembly vga programming book can someone give me the title of a good vga graphics programming book please respond by email thanks yuan che yuan wang cw uxa cso uiuc edu cywang ux cso uiuc edu

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re fractals what good are they in regards to fractal commpression i have seen fractal compressed movies they were both fairly impressive the first one was a gray scale movie of casablanca it was mb and had minutes of fps video it was a little grainy but not bad at all the second one i saw was only minutes but it had bit color with fps and measured in at mb i consider the fractal movies a practical thing to explore but unlike many other formats out there you do end up losing resolution i don t know what kind of software hardware was used for creating the movies i saw but the guy that showed them to me said it took minutes per frame to generate but as i said above playback was or more frames per second and how else could you put minutes on one floppy disk davidr rincon ema rockwell com my opinions are my own except where they are shared by others in which case i will probably change my mind

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re re vga x graphics mode my a vesa tsr supports this can you report crt and other register state in this mode thank s serge ivanov serge argus msk su

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reaction diffusion techniques this past week i ve been playing with some of the r d reaction diffusion not to be confused with rds or r d techniques from siggraph i was wondering what material is available to explain the control mechanism a little more it seems to me very much like a matter of picking random magic numbers and sitting back and waiting although both of the papers turk and witkin kass were very well organized and extremely helpful i guess what i need is a more basic description of the technique especially wrt the control mechanisms the tests that i did had a tendency to either turn into blurry mud or become unstable is there any info available online source code would be great but not necessary thanks terran j boylan sr artist programmer it s better to have loved engineering animation inc ames ia and lost than just to have pm lost dorky dog

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bit graphics cards i am looking for eisa or vesa local bus graphic cards that support at least x x resolution i know matrox has one but it is very expensive all the other cards i know of that support that resoultion are striaght isa also are there any x servers for a unix pc that support bits thanks

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re fractal generation of clouds haabn nye nscee edu frederick j haab writes i need to implement an algorithm to fractally generate clouds as sort of a benchmark for some algorithms i m working on just as a matter of interest a self promo computer graphics sequence that one of the local tv stations used to play quite a lot a couple of years ago showed a d flyover of australia from the west coast to the east the clouds were quite recognisable as fuzzy flat white mandlebrot sets david silver

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please recommend d graphics library for mac hi netters i m building a cad package and need a d graphics library that can handle some rudimentry tasks such as hidden line removal shading animation etc can you please offer some recommendations i ll also need contact info name address email if you can find it thanks please post your responses in case others have same need bob carpenter

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re hot new d software in article qflpk re usenet ins cwru edu mbc po cwru edu michael b comet wrote in a previous article trb ra msstate edu tony r boutwell says there is a new product for the ibm ers out there it is called imagine and it just started shipping yesterday i can personally attest that it will blow the doors off of d studio it is made by impulse and is in its well i don t know about its competing with d studio but it s pretty powerful allright yes but a key issue is speed how fast is imagine and is it as easy to use as d studio can it just do a render as fast as ds if you don t want things like ior etc ds can do fine shadows animated reflection maps animated bump maps animated anything maps and with the ipas routines not that i ve ever seen them it can do explosions top quality morphing fire rain lens flares etc i m not knocking imagine i just want to know how it compares with ds

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raytracers which is best hi all i ve just recently become seriously hooked on pov but there are a few thing that i want to do that pov won t do penumbral shadows dispersion etc i was just wondering what other shareware freeware raytracers are out there and what can they do i ve heard of vivid and polyray and rayshade and so on but i d rather no wade through several hundred pages of manual for each trying to work out what their capabilities are can anyone help a comparison of tracing speed between each program would also be mucho useful mark mark mackey life is a terminal disease and oxygen is mmackey aqueous ml csiro au addictive are you hooked

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shareware recently i saw the latest computer shopper and in it there was an article on nice shareware graphics programs they looked pretty good and of the listed in the article one i had graphics workshop one i found via archie draft choice old version though and the rest i couldn t find so if there is anyone that knows where i can get the following programs via anonymous ftp please let me know adkins graphics ag zip ag zip draft choice latest vga version draftc zip envision publisher envis zip envis zip neopaint neopnt zip thanx in advance d petro david petro kwyjibo a big dumb balding dept of physics north american ape university of windsor petro server uwindsor ca

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re please recommend d graphics library for mac robert g carpenter writes hi netters i m building a cad package and need a d graphics library that can handle some rudimentry tasks such as hidden line removal shading animation etc can you please offer some recommendations i ll also need contact info name address email if you can find it thanks please post your responses in case others have same need bob carpenter i too would like a d graphics library how much do c libraries cost anyway can you get the tools used by say renderman and can you get them at a reasonable cost sorry that i don t have any answers just questions matt madsen mmadsen ics uci edu

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thinning algorithm hi netters i am looking for source code that can reads the ascii file or bitmap file and produced the thinned image for example to preprocess the character image i want to apply thinning algorithm thanks kevin

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looking for autocad dxf file parser hello does anyone know of any c or c function libraries in the public domain that assist in parsing an autocad dxf file please e mail thanks jogle geigel seas gwu edu

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delaunay triangulation does anybody know what delaunay triangulation is is there any reference to it is it useful for creating d objects if yes what s the advantage thanks in advance yeh usc

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re cylinder and ray in article qc fginnbv darkstar ucsc edu koehler secs ucsc edu writes i would be most thrilled if some kind person could help me with the following given a cylinder in d defined as a line segment between two points and a radius e g sx sy sz to ex ey ez and r what is the easiest and not too expensive way to find if a ray defined as another line through two points cuts through this cylinder and if so where i think the test for touching is rather simple if the closest approach of the two lines is less than r then the ray does penetrate the cylinder nope this won t work for a cylinder you can have a line arbitrarily close to the the cylinder backbone and yet not intersect it the test works for a pillbox though a cylinder with two hemispheres attached at the ends thanks ryan koehler secs ucsc edu arun

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re crimson was kubota announcement in article bu edu kiki problem with inews gateway file keith baccki writes c lee lee obiwan rsg hac com wrote did you say dec alpha upgrade path from xx replace upgrade path from vax x to alpha replace the system not totally fair you haven t mentioned the decstation series i think if sgi made cisc mainframes they wouldn t provide an upgrade path to an onyx i agree with you about the upgrade path but i think i was fair the original posting complained about sgi coming out with newer and better architectures and not having an upgrade path from the older ones and that dec did on statement i merely attempted to point out that all computer companies are constantly attempting to improve their product market position share in so doing they eventually come to a point where they have a new architecture and the only upgrade path is to replace the system and the particular system he was complaining about was in computer lifetimes relatively old on statement i felt dec s history of providing upgrades was not far superior than the industry average and that in my opinion sgi s history is better than dec s and what is dec doing with it s mips based decstation line are they going to abandon it for their alpha based line or provide an upgrade path to r s and tfp s and r s

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book of kells correction i aparantly mistyped the address for the ftp site which holds the images the correct address should be jupiter csd unb ca rather than jupiter csd unb edu they are in the directory pub library info jon williams university of northern iowa

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job job opportunity seri systems engineering research institute of kist korea institute of science and technology is looking for the resumes for the following position and need them by the end of june if you are interested send resumes to cad cae lab th floor systems engineering research institute korea institute of science and technology yousung gu eoeun dong daejon korea company systems engineering research institute title senior research scientist job description in depth knowledge of c working knowledge of computer aided design working knowledge of computer graphics working knowledge of virtual reality skills not required but desirable knowledge of data modeling virtual reality experience understanding of client server architecture requirement ph d job location daejon korea contact info chul ho lim cad cae lab th floor systems engineering research institute korea institute of science and technology yousung gu eoeun dong daejon korea phone fax e mail jxl

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chosing optimal colors for colormap hi i m looking for an algorithm that would generate a good cross section of rgb colours given a limited colour map size the problem i m writing an application for the pc that may have at most colors i want to use one colormap palette for the application but i d like it to contain an even spread of colours of the visible spectrum i could use a x x rgb cube but the problem is that a lot of those colours are almost identical to the human eye does anyone know how i can optimize my choice of colors

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re siggraph srnelson speedsail eng sun com scott r nelson writes dave mikelson almac co uk dave mikelson writes does anyone know if there is an open day for the public at any time that is not to attend conferences but just browse around the exhibits or are the exhibits etc just for fully registered attendees was free as long as you got it to siggraph on or before july for it was similar or free before july it is safe to assume that the same kind of deal will be available this year i just got my advance program and the card in the back is for the exhibits plus program the exhibits plus admission to a number of conference venues including a special general session behind the scenes computer graphics in film admission is not free but is a nominal exhibits are open august to get a copy of the advance program you can call the advance program itself is a good indication of the excitement of the conference register early and get in for free sorry doesn t work this year steve cunningham

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d studio works changes hi guys like all people in this group i m a fans of fractal and render sw my favourite are fractint pov dstudio now listen my ideas i have just starting now to be able to use dstudio quite well so i m simulating a full animation of a f grand prix unfortanatly just some lap i m very interested about all kind of prj ds and so on concerning about cars or parts of its motors wheel dxf are good enough does anyone have object to give me to complete my hard animation anyway any exchanges about object material project will be very apreciate is there a ftp site where i can find its i m looking for pov files too i m interested about cpu time comparision rendering images on pov dstusio thank to all email me at rosa ghost sm dsi unimi it

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re rumours about do dave optimla aimla com dave ziedman writes do is still a concept the software is what sells and what will determine its success apparantly you dont keep up on the news do was shown at ces to developers and others at private showings over software licensees currently developing software for it i would say that it is a lot more than just a concept

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re please recommend d graphics library for m in article g bcstec ca boeing com rgc bcstec ca boeing com robert g carpenter writes hi netters i m building a cad package and need a d graphics library that can handle some rudimentry tasks such as hidden line removal shading animation etc can you please offer some recommendations i ll also need contact info name address email if you can find it thanks please post your responses in case others have same need bob carpenter i ve been given the sites of some excellent d objects on all sorts of file formats here s where they are host plaza aarnet edu au location graphics graphics mirrors directory drwxr xr x apr avalon chinalake navy mil host compute cc ncsu edu location mirrors wustl graphics graphics mirrors directory drwxr xr x mar avalon chinalake navy mil host wuarchive wustl edu location graphics graphics mirrors directory drwxr xr x jan avalon chinalake navy mil see ya ajay