Some VESA bios's support this mode (0x100). And *any* VGA should be able to support this (640x480 by 256 colors) since it only requires 256,000 bytes. My 8514/a VESA TSR supports this; it's the only VESA mode by card can support due to 8514/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) Does anybody know what Delaunay Triangulation is? Is there any reference to it? Is it useful for creating 3-D objects? If yes, what's the advantage? Thanks in advance. Yeh USC Hi! Everyone, Since some people quickly solved the problem of determining a sphere from 4 points, I suddenly recalled a problem which is how to find the ellipse from its offset. For example, given 5 points on the offset, can you find the original ellipse analytically? I spent two months solving this problem by using analytical method last year, but I failed. Under the pressure, I had to use other method - nonlinear programming technique to deal with this problem approximately. Any ideas will Please post the location of the file or better yet, e-mail me at mlee@eng.sdsu.edu. 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 8..10. Sorry, I don't have a specific reference describing the process. -Michael IMAGINE and it just started shipping yesterday I can personally attest that it will blow the doors off of 3D-Studio. It is made by IMPUlSE, and is in its 3rd version 1st) 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 Archer> How about "Interactive Sex with Madonna"? or "Sexium" for short. -- Lars Fischer, fischer@iesd.auc.dk | It takes an uncommon mind to think of CS Dept., Aalborg Univ., DENMARK. | these things. -- Calvin 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 polygon. Does anyone have any such code or a reference to book containing information on the subject ? Regards Simon 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? af774@cleveland.freenet.edu cipiti@bobcat.ent.ohiou.edu It might be Heisenberg. chad@voxel.zool.ohiou.edu 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(218) or char(196) or char(197) 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. 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 1542, 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 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)? 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 24-100 hours used that marvelous piece of hardware called "grad students" to do the work. Supposedly it's been automated since about 1988, but I'm still waiting to be impressed. Allen B (Sign me "Cynical") 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 -> I have been on the phone with Impulse for about 3 months waiting for -> my cross - platform upgrade (Amiga to IBM). They have told me every -> week for 3 months, "it will be ready next week". Still waiting They've been saying that for two years now, you'd think by now people wouldn't go on about it being 'soon' and only believe it when they can buy it. I wish Amiga users wouldn't be so gullible (gasp, how dare he say that -- Canada Remote Systems - Toronto, Ontario 416-629-7000/629-7044 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 They were both fairly impressive. The first one was a 64 gray scale "movie" of Casablanca, it was 1.3MB and had 11 minutes of 13 fps video. It was a little grainy but not bad at all. The second one I saw was only 3 minutes but it had 8 bit color with 10fps and measured in at 1.2MB. 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 1024x786x24 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 24 bits? thanks Please respond by email. Thanks! --Yuan -- Che-Yuan Wang cw21219@uxa.cso.uiuc.edu cywang@ux1.cso.uiuc.edu 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 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 6 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 :AG1.ZIP, AG2.ZIP Draft Choice (latest VGA version) : DRAFTC.ZIP Envision 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 . 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.) -arun -- 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 256 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 6x6x6 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 Apparantly you dont keep up on the news. 3DO was shown at CES to developers and others at private showings. Over 300 software licensees currently developing software for it. I would say that it is a *LOT* more than just a concept. Sketch: Rotate so cylinder axis is || Z axis. Intersect X/Y projection of line with projected cylinder (similar to, but easier than, sphere intersection). Result: no intersection, one intersection, or two intersections, parameterized along line by t0 and t1. Now look at Z, and compute intersections of line with top and bottom planes of cylinder. This gives t0' and t1'. The interval of intersection is then the bit of the line from [t0,t1] INTERSECT [t0',t1 Details left as an exercise for the Has anybody compiled VOGL-graphics library for IBM-PC? I need to call it from MS-Fortran but don't have MS-C to compile the sources. Thanks for any help martti toivakka mtoivakk@abo.fi with digital map information containing 178,068 latitude, longitude points. It is said to be in the public domain. If anyone knows a place where I can get it (preferably FTP/gopher/mailserver etc.; otherwise snail mail) please let me know. I you have it yourself and are willing to send me the file, drop me a line. I'll be using it with a program called VERSAMAP by Charles H. Culberson. If anyone knows of another detailed database that can be used with this program (preferably PD), I would be Run-time licensing needs? Bob Robert A. Schmitt | Applied Derivatives Technology | Lehman Brothers rschmitt@shearson.com Hello, I am searching for rendering software which has been developed to specifically take advantage of multi-processor computer systems. Any pointers to such software would be greatly appreciated. Thanks. -- Billy Carter, Software Engineering Section Southwest Research Institute wcarter@swri.edu halftone screen rather than a round dot ? My printer would prefer an elliptical dot, but I'm not sure how to set it up. I'm sending from a Mac IIci to a Linotronic L300 imagesetter and I am using Photoshop 2.0.1 to make my separations. Any help would be greatly appreshed. T.I.A. Michael (Unscene) Michael Maier, Computer Artist, ANL | [|Ú Z* Glued to the veiw. Email michael_maier@qmgate.anl.gov | "TV is the milk of Amnesia." Phone 708 252 5298 | Ñ Michael Maier prompt. VMODE is included with the Speedstar 24. I have used the VESA mode for autodesk animator pro. -- "Inumerable confusions and a feeling of despair invariably emerge in periods of great technological and cultural transition." Marshall McLuhan I am interesting in cartography and would find these gifs useful. tia, -- Lee Van Dyke lvandyke@balboa.eng.uci.edu, UUCP: infotec!Infotec.COM!lee@sunkist.West.Sun.COM Can anybody suggest robust algorithms/code for computing the point of intersection on n, 2-d lines in a plane. The data has outliers and hence a simple least squares technique does not seem to provide satifactory results. Please respond by e-mail and I will post the summary to the newsgroups if there is sufficient interest. Thanks, Raj Talluri Member Technical Staff Image Understanding Branch Texas Instruments Central Research Labs Dallas, Texas 75248 talluri@csc.ti.com Given 4 points (non coplanar), how does one find the sphere, that is, center and radius, exactly fitting those points? I know how to do it for a circle (from 3 points), but do not immediately see a straightforward way to do it in 3-D. I have checked some geometry books, Graphics Gems, and Farin, but am still at a loss? Please have mercy on me and provide the solution? Thanks, Ed -- Ed Bolson University of Washington Cardiovascular Research (206)543-4535 bolson@u.washington.edu (preferred) Has ANYONE who has ordered the new PC version of Imagine ACTUALLY recieved it yet? I'm just about ready to order but reading posts about people still awaiting delivery are making me a little paranoid. Has anyone actually held this piece of software in their own hands? Later, Jim Nobles I've tried a couple without much luck. Please E-mail responses and I will post a summary of any replies. Thank you. Richard Stoakley rws2v@uvacs.cs.Virginia.EDU Hi, Does anybody have the source code to the externel processes that comes with 3D Studio, and mabe som kind of DOC for writing the processes your self. GoldED 2.41 Yes, please create the group alt.raytrace soon!! I'm hooked on pov. geez. like I don't have anything better to do OH!! dave letterman is on pathology images and are getting ratios of 40:1 to 70:1 without too much loss in quality. It is taking about 4 mins per image to compress, on a 25Mhz 486 but decompression is almost real time on a 386 in software alone. The 68070 is a variation of the 68010 that was done a few years ago by the European partners of Motorola. It has some integrated I/O controllers and half a MMU, but otherwise it's a 68010. Think of it the same as the 8086 and 80186 were. Burkhard Neidecker-Lutz Distributed Multimedia Group, CEC Karlsruhe EERP Portfolio Manager Software Motion Pictures & BERKOM II Project Multimedia Base Technology Digital Equipment Corporation neidecker@nestvx.enet.dec.com own variant. This chip includes extra featurfes such as more I/O ports, I2C bus making it more microcontroller like. Because of the confusion with numbering Philips other products in the [range with the 68 core have been given differend numbers like PCF or PCD7.. or something. or some other bitmapped file and turning it (or parts of it) into ascii characters? DOS, OS/2 or platform independent programs if possible. Thanks. A stupid question, but what will CView run on and where can I get it? I am still in need of a GIF viewer for Linux. (Without X-Windows.) Thanks! I have to beg to differ on this point, as the batch file I use to launch cview cd's to the dir where cview resides and then invokes it. every time I crash cview, the 0-byte temp file is found in the root dir of the drive cview is on. just my $0.13, cb -- Cyberspace Buddha { Why are you looking for more knowledge when you } /(o\ cb@wixer.bga.com \ do not pay attention to what you already know? / \o)/ cb@wixer.cactus.org } "get out of my chair!" -- Hillary to god { peace Hi. I'm writing a program to convert .dxf files to a database format used by a 3D graphics program I've written. My program stores the points of a polygon in CCW order. I've used 3D Concepts a little and it seems that the points are stored in the order they are drawn. Does the DXF format have a way of indicating which order the points are stored in, CW or CCW? Its easy enough to convert, but if I don't know which way they are stored, I dont know which direction the polygon should be visible I am scanning in a color image and it looks fine on the screen. When I converted it into PCX,BMP,GIF files so as to get it into MS Windows the colors got much lighter. For example the yellows became white. Any ideas? thanks Dan csc3phx@vaxc.hofstra.edu The equation of the sphere through the 4 points (x1,y1,z1 x4,y4,z4) is When this 5 by 5 determininant is expanded on its first column you get the equation in the form A(x^2+y^2+z^2) + Bx + Cy + Dz + E = 0 If you need the center and radius, jyst divide through by A (it cannot be zero if the 4 given points form a non-degenerate tetrahedron) and complete the square on x, y, and z to obtain (x-xc)^2 + (y-yc)^2 + (z-zc)^2 = r^2 rcb@slacvm.slac.stanford.edu (Bob Beach) the spring. Ivan Sutherland, the father of computer graphics and an innovator in microprocessing, will be speaking at Harvard University on Tuesday, April 20, 1993, at 4:00 pm in Aiken Computations building, room 101. The title of his talk is "Logical Effort and the Conflict over the Control of Information." Cookies and tea will be served at 3:30 pm in the Aiken Lobby. Admissions is free, and all are welcome. Aiken is located north of the Science Center near the Law School. For more It's spend-the-money-before-it-goes-away time here at U.Florida and we need to find some PC-based software that will do contour plotting with irregular boundaries,i.e., a 2-D profile of a soil system with a pond superimposed POND / | trial run but it interpolates | creates artifacts at the borders. a response, I'll post a summary. Thanks -- (and now back to lurking). Steve Bloom, Soil & Water Science, U.Fl (SAB@GNV.IFAS.UFL.EDU) the algiorithm seems a little bit long. I developed my own method, which requires that the points be in a counter-clockwise order, and returns whether you are looking at the back or the front, similar to the plane eqn method. It uses few calculations however, basically it is several comparisons. The only disadvantage I see is that it must be done after the transformation from view coordinates to coordinates to display on the screen, which means that a little more calculation isneeded beforehand. [Most info regarding dangers of reading from Floppy disks omitted] In all fairness, how many people do you know personally who read images from Floppy drives? I haven't tried it with JPEGs, but I do realize how agonizingly slow it is with GIF files. Nevertheless, it is an important bug that needs to be squashed. I am merely pointing out that it was probably overlooked. While it is serious, one must keep in mind that it will probably affect at most 5% of the targeted users of CView. No, VGALIB? Amazing.. I guess it was lost in all those subdirs Thanks for correcting me. It doesn't sound very appealing though, only 320x200? I'm glad it wasn't something major I missed. Thanks, Future". These include reprints of 3 chapters probably of interest to readers of this forum, including: 1. Current Techniques and Development of Computer Art, by Franz Szabo 2. Forging a Career as a Sculptor from a Career as Computer Programmer, by Stewart Dickson 3. Fractals and Genetics in the Future by H. Joel Jeffrey I'd be happy to send out free reprints to researchers for scholarly purposes, until the reprints run out. Just send me your name and address. Thanks, Cliff cliff@watson. tried to ftp to: ccu1.aukland.ac.nz [130.216.1.5]: ftp/mac/architec - *VISION-3D facet and received an 'unknown host' message. mail to Paul D. Bourke (pdbourke@ccu1.aukland.ac.nz) bounces with basically the same problem. Where'd he go Rick -- Rick Pavek | Never ask a droid to outdo its program. kuryakin@bcstec.ca.boeing.com | Seattle, WA | It wastes your time Hi, I'm looking for the 3-D studio driver for the Oak card with 1 M of RAM. This would be GREATLY (and I mean that) appreciated Maybe I should have just gotten a more well know card. thanks seth@acpub.duke.edu book about graphics, still and animated, and in VGA/SVGA. Thanks in advance -- Mohammad R. Khan / khan0095@nova.gmi.edu After July '93, please send mail to mkhan@nyx.cs.du.edu Sorry Scott, if you post it here, you can read it here. There is a shareware program available via anonymous FTP that will suit your needs. You'll find it at OAK.OAKLAND.EDU in the subdirectory pub/msdos/graphics. The file is called "GRFWK61T.ZIP." TMC. (tmc@spartan.ac.brocku.ca) the graphics in the WingCommander series, and the RealSpace system they use. I think it's really awesome, and wouldn't mind being able to use similar features in programs. Thanks in advance. Daemon fancy. The features I want is simple wireframe display, flat shading, simple transformation. It would be nice to have hidden line. Any information is appreciated. 310-523-9393). It has the basic image processing tools for all major formats, does screen grabbing, and allows all your image files to be calalogged into a thumbnail database. It's great! Don I'm getting ready to buy a multimedia workstation and would like a little advice. I need a graphics card that will do video in and out under windows. I was originally thinking of a Targa+ but that doesn't work under Windows. What cards should I be looking into? Thanks, Craig -- "To forgive is divine, to be -Craig Williamson an airhead is human." Craig.Williamson@ColumbiaSC.NCR.COM -Balki Bartokomas craig@toontown.ColumbiaSC.NCR.COM (home) Perfect Strangers polygon routine to be used in a 3D game. I have one that works right now, but its very slow. Could anyone point me to one, pref in ASM that is fairly well documented and flexible? Thanx, A 68070 is just a 68010 with a built in MMU. I don't even think that Moto. manufactures them. - Ian Romanick Dancing Fool of Epsilon "Virtual Reality Clothing Company" which recently opened up in Vancouver. As far as I can tell it's just another "chic" clothes spot. Although it would be interesting if they were selling "virtual clothing E-mail me if you want me to dig up their phone # and you can probably get some promotional lit. MP (8 Howdy all, Where could I find a screen-grabber program for MS-Windows? I'm writing up some documentation and it would be VERY helpful to include sample screens into the document. Please e-mail as I don't usualy follow this group. Thanks a lot, Grant -- Grant Totten, Programmer/Analyst, Trent University, Peterborough Ontario GTotten@TrentU.CA Phone: (705) 748-1653 FAX: (705) 748-1246 "The human brain is like an enormous fish -- it is flat and slimy and has gills through which it can see." --