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• Encrypted home breaks on login

  - by berkes

  My home is encrypted, which breaks the login. Gnome and other services try to find all sorts of .files, write to them, read from them and so on. E.g. .ICEauthority. They are not found (yet) because at that moment the home is still encrypted. I do not have automatic login set, since that has known issues with encrypted home in Ubuntu. When I go trough the following steps, there is no problem: boot up the system. [ctr][alt][F1], login. run ecryptfs-mount-private [ctr][alt][F7], done. Can now login. I may have some setting wrong, but have no idea where. I suspect ecryptfs-mount-private should be ran earlier in bootstrap, but do not know how to make it so. Some issues that may cause trouble: I have a fingerprint reader, it works for login and PAM. I have three keyrings in seahorse, containing passwords from old machines (backups). Not just one. Suggestion was that the PAM settings are wrong, so here are the relevant parts from /etc/pam.d/common-auth. # here are the per-package modules (the "Primary" block) auth [success=3 default=ignore] pam_fprintd.so auth [success=2 default=ignore] pam_unix.so nullok_secure try_first_pass auth [success=1 default=ignore] pam_winbind.so krb5_auth krb5_ccache_type=FILE cached_login try_first_pass # here's the fallback if no module succeeds auth requisite pam_deny.so # prime the stack with a positive return value if there isn't one already; # this avoids us returning an error just because nothing sets a success code # since the modules above will each just jump around auth required pam_permit.so # and here are more per-package modules (the "Additional" block) auth optional pam_ecryptfs.so unwrap # end of pam-auth-update config I am not sure about how this configuration works, but ut seems that maybe the*optional* in auth optional pam_ecryptfs.so unwrap is causing the ecryptfs to be ignored?

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• How best to deal with the frustration that you encounter at the beginning of learning to code [closed]

  - by coderboy

  I am right now a newbie on the job learning to code in Cocoa . In the beginning I decided that I would try and understand everything I was doing . But right now I just feel like a clueless wizard chanting some spells . Its all just a matter of googling the right incantation . Frequently getting stuck and having to google for answers is proving to be a major demotivator for me . I know that this will get better over time but still I feel that somewhere , somehow I'm just approaching things the wrong way . I sit there stumped and then finally just look at sample code from Apple and I go Wow ! This is so logical and well structured ! . But just reading it is not going to get me to that level . So I would like to know , how do you guys approach learning something new . Do you read the whole documentation first , or do you read sample code or maybe its just about making lots of small programs first ?

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• Constant game speed independent of variable FPS in OpenGL with GLUT?

  - by Nazgulled

  I've been reading Koen Witters detailed article about different game loop solutions but I'm having some problems implementing the last one with GLUT, which is the recommended one. After reading a couple of articles, tutorials and code from other people on how to achieve a constant game speed, I think that what I currently have implemented (I'll post the code below) is what Koen Witters called Game Speed dependent on Variable FPS, the second on his article. First, through my searching experience, there's a couple of people that probably have the knowledge to help out on this but don't know what GLUT is and I'm going to try and explain (feel free to correct me) the relevant functions for my problem of this OpenGL toolkit. Skip this section if you know what GLUT is and how to play with it. GLUT Toolkit: GLUT is an OpenGL toolkit and helps with common tasks in OpenGL. The glutDisplayFunc(renderScene) takes a pointer to a renderScene() function callback, which will be responsible for rendering everything. The renderScene() function will only be called once after the callback registration. The glutTimerFunc(TIMER_MILLISECONDS, processAnimationTimer, 0) takes the number of milliseconds to pass before calling the callback processAnimationTimer(). The last argument is just a value to pass to the timer callback. The processAnimationTimer() will not be called each TIMER_MILLISECONDS but just once. The glutPostRedisplay() function requests GLUT to render a new frame so we need call this every time we change something in the scene. The glutIdleFunc(renderScene) could be used to register a callback to renderScene() (this does not make glutDisplayFunc() irrelevant) but this function should be avoided because the idle callback is continuously called when events are not being received, increasing the CPU load. The glutGet(GLUT_ELAPSED_TIME) function returns the number of milliseconds since glutInit was called (or first call to glutGet(GLUT_ELAPSED_TIME)). That's the timer we have with GLUT. I know there are better alternatives for high resolution timers, but let's keep with this one for now. I think this is enough information on how GLUT renders frames so people that didn't know about it could also pitch in this question to try and help if they fell like it. Current Implementation: Now, I'm not sure I have correctly implemented the second solution proposed by Koen, Game Speed dependent on Variable FPS. The relevant code for that goes like this: #define TICKS_PER_SECOND 30 #define MOVEMENT_SPEED 2.0f const int TIMER_MILLISECONDS = 1000 / TICKS_PER_SECOND; int previousTime; int currentTime; int elapsedTime; void renderScene(void) { (...) // Setup the camera position and looking point SceneCamera.LookAt(); // Do all drawing below... (...) } void processAnimationTimer(int value) { // setups the timer to be called again glutTimerFunc(TIMER_MILLISECONDS, processAnimationTimer, 0); // Get the time when the previous frame was rendered previousTime = currentTime; // Get the current time (in milliseconds) and calculate the elapsed time currentTime = glutGet(GLUT_ELAPSED_TIME); elapsedTime = currentTime - previousTime; /* Multiply the camera direction vector by constant speed then by the elapsed time (in seconds) and then move the camera */ SceneCamera.Move(cameraDirection * MOVEMENT_SPEED * (elapsedTime / 1000.0f)); // Requests to render a new frame (this will call my renderScene() once) glutPostRedisplay(); } void main(int argc, char **argv) { glutInit(&argc, argv); (...) glutDisplayFunc(renderScene); (...) // Setup the timer to be called one first time glutTimerFunc(TIMER_MILLISECONDS, processAnimationTimer, 0); // Read the current time since glutInit was called currentTime = glutGet(GLUT_ELAPSED_TIME); glutMainLoop(); } This implementation doesn't fell right. It works in the sense that helps the game speed to be constant dependent on the FPS. So that moving from point A to point B takes the same time no matter the high/low framerate. However, I believe I'm limiting the game framerate with this approach. Each frame will only be rendered when the time callback is called, that means the framerate will be roughly around TICKS_PER_SECOND frames per second. This doesn't feel right, you shouldn't limit your powerful hardware, it's wrong. It's my understanding though, that I still need to calculate the elapsedTime. Just because I'm telling GLUT to call the timer callback every TIMER_MILLISECONDS, it doesn't mean it will always do that on time. I'm not sure how can I fix this and to be completely honest, I have no idea what is the game loop in GLUT, you know, the while( game_is_running ) loop in Koen's article. But it's my understanding that GLUT is event-driven and that game loop starts when I call glutMainLoop() (which never returns), yes? I thought I could register an idle callback with glutIdleFunc() and use that as replacement of glutTimerFunc(), only rendering when necessary (instead of all the time as usual) but when I tested this with an empty callback (like void gameLoop() {}) and it was basically doing nothing, only a black screen, the CPU spiked to 25% and remained there until I killed the game and it went back to normal. So I don't think that's the path to follow. Using glutTimerFunc() is definitely not a good approach to perform all movements/animations based on that, as I'm limiting my game to a constant FPS, not cool. Or maybe I'm using it wrong and my implementation is not right? How exactly can I have a constant game speed with variable FPS? More exactly, how do I correctly implement Koen's Constant Game Speed with Maximum FPS solution (the fourth one on his article) with GLUT? Maybe this is not possible at all with GLUT? If not, what are my alternatives? What is the best approach to this problem (constant game speed) with GLUT? I originally posted this question on Stack Overflow before being pointed out about this site. The following is a different approach I tried after creating the question in SO, so I'm posting it here too. Another Approach: I've been experimenting and here's what I was able to achieve now. Instead of calculating the elapsed time on a timed function (which limits my game's framerate) I'm now doing it in renderScene(). Whenever changes to the scene happen I call glutPostRedisplay() (ie: camera moving, some object animation, etc...) which will make a call to renderScene(). I can use the elapsed time in this function to move my camera for instance. My code has now turned into this: int previousTime; int currentTime; int elapsedTime; void renderScene(void) { (...) // Setup the camera position and looking point SceneCamera.LookAt(); // Do all drawing below... (...) } void renderScene(void) { (...) // Get the time when the previous frame was rendered previousTime = currentTime; // Get the current time (in milliseconds) and calculate the elapsed time currentTime = glutGet(GLUT_ELAPSED_TIME); elapsedTime = currentTime - previousTime; /* Multiply the camera direction vector by constant speed then by the elapsed time (in seconds) and then move the camera */ SceneCamera.Move(cameraDirection * MOVEMENT_SPEED * (elapsedTime / 1000.0f)); // Setup the camera position and looking point SceneCamera.LookAt(); // All drawing code goes inside this function drawCompleteScene(); glutSwapBuffers(); /* Redraw the frame ONLY if the user is moving the camera (similar code will be needed to redraw the frame for other events) */ if(!IsTupleEmpty(cameraDirection)) { glutPostRedisplay(); } } void main(int argc, char **argv) { glutInit(&argc, argv); (...) glutDisplayFunc(renderScene); (...) currentTime = glutGet(GLUT_ELAPSED_TIME); glutMainLoop(); } Conclusion, it's working, or so it seems. If I don't move the camera, the CPU usage is low, nothing is being rendered (for testing purposes I only have a grid extending for 4000.0f, while zFar is set to 1000.0f). When I start moving the camera the scene starts redrawing itself. If I keep pressing the move keys, the CPU usage will increase; this is normal behavior. It drops back when I stop moving. Unless I'm missing something, it seems like a good approach for now. I did find this interesting article on iDevGames and this implementation is probably affected by the problem described on that article. What's your thoughts on that? Please note that I'm just doing this for fun, I have no intentions of creating some game to distribute or something like that, not in the near future at least. If I did, I would probably go with something else besides GLUT. But since I'm using GLUT, and other than the problem described on iDevGames, do you think this latest implementation is sufficient for GLUT? The only real issue I can think of right now is that I'll need to keep calling glutPostRedisplay() every time the scene changes something and keep calling it until there's nothing new to redraw. A little complexity added to the code for a better cause, I think. What do you think?

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• Handling SEO for Infinite pages that cause external slow API calls

  - by Noam

  I have an 'infinite' amount of pages in my site which rely on an external API. Generating each page takes time (1 minute). Links in the site point to such pages, and when a users clicks them they are generated and he waits. Considering I cannot pre-create them all, I am trying to figure out the best SEO approach to handle these pages. Options: Create really simple pages for the web spiders and only real users will fetch the data and generate the page. A little bit 'afraid' google will see this as low quality content, which might also feel duplicated. Put them under a directory in my site (e.g. /non-generated/) and put a disallow in robots.txt. Problem here is I don't want users to have to deal with a different URL when wanting to share this page or make sense of it. Thought about maybe redirecting real users from this URL back to the regular hierarchy and that way 'fooling' google not to get to them. Again not sure he will like me for that. Letting him crawl these pages. Main problem is I can't control to rate of the API calls and also my site seems slower than it should from a spider's perspective (if he only crawled the generated pages, he'd think it's much faster). Which approach would you suggest?

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• How to find the Fastest DNS servers to host our domain?

  - by Denis Volovik

  The question was born because lately we've seen a pretty odd (well, at least for us, for the first time) - error message in Google webmaster tools - "DNS lookup timeout" ... I was pretty sure that with eNom's 5 DNS servers (dns1... to dns5.name-services.com) we're pretty set... But it appears that from (Europe/Hungary), for example - dns1.name-services.com takes 170ms. to respond on a ping... while GoDaddy's ns75.domaincontrol.com - takes only 40 ms. to respond... and at the same time - dns2 to dns5.name-services.com - each result with a timeout error (on ping)... This issue came to our attention right in the final stages of optimizing our web-site (almost to death) - basically, just in time... I would love to move our domains to a fast (fastest?) and reliable DNS server.. - but how do I find one ? Also - I did the ping tests from various geographic locations (we have servers in many countries) and GoDaddy seemed to be faster than eNom almost in every case. I'd be very thankful for any hints on this! Edited: Well.. maybe this one does not have an answer, after all...

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• 'Binary XML' for game data?

  - by bluescrn

  I'm working on a level editing tool that saves its data as XML. This is ideal during development, as it's painless to make small changes to the data format, and it works nicely with tree-like data. The downside, though, is that the XML files are rather bloated, mostly due to duplication of tag and attribute names. Also due to numeric data taking significantly more space than using native datatypes. A small level could easily end up as 1Mb+. I want to get these sizes down significantly, especially if the system is to be used for a game on the iPhone or other devices with relatively limited memory. The optimal solution, for memory and performance, would be to convert the XML to a binary level format. But I don't want to do this. I want to keep the format fairly flexible. XML makes it very easy to add new attributes to objects, and give them a default value if an old version of the data is loaded. So I want to keep with the hierarchy of nodes, with attributes as name-value pairs. But I need to store this in a more compact format - to remove the massive duplication of tag/attribute names. Maybe also to give attributes native types, so, for example floating-point data is stored as 4 bytes per float, not as a text string. Google/Wikipedia reveal that 'binary XML' is hardly a new problem - it's been solved a number of times already. Has anyone here got experience with any of the existing systems/standards? - are any ideal for games use - with a free, lightweight and cross-platform parser/loader library (C/C++) available? Or should I reinvent this wheel myself? Or am I better off forgetting the ideal, and just compressing my raw .xml data (it should pack well with zip-like compression), and just taking the memory/performance hit on-load?

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• single for-loop runtime explanation problem

  - by owwyess

  I am analyzing some running times of different for-loops, and as I'm getting more knowledge, I'm curious to understand this problem which I have still yet to find out. I have this exercise called "How many stars are printed": for (int i = N; i > 1; i = i/2) System.out.println("*"); The answers to pick from is A: ~log N B: ~N C: ~N log N D: ~0.5N^2 So the answer should be A and I agree to that, but on the other side.. Let's say N = 500 what would Log N then be? It would be 2.7. So what if we say that N=500 on our exercise above? That would most definitely print more han 2.7 stars? How is that related? Because it makes sense to say that if the for-loop looked like this: for (int i = 0; i < N; i++) it would print N stars. I hope to find an explanation for this here, maybe I'm interpreting all these things wrong and thinking about it in a bad way. Thanks in advance.

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• Xfce gets really confused about session saving, etc

  - by Pointy

  I'm getting a new laptop running with 11.04 Ubuntu. I've got the xfce4 packages all installed, which is something I've had no problems with on any of my other machines. On this new laptop, however, though I can log in and use an xfce session without any problems, logging out of a session is problematic: I click the "Log out" widget from the panel and then "Log out" from its option dialog. Then the thing just sits there, not logging out. Subsequent attempts to open the "Log out" widget fail with an error about the session manager being busy. After maybe a minute or so, it logs out. Though I've got the "Save session" option checked in the log out dialog, xfce just makes a complete hash of the business. It does remember the applications that I had running, but it seems to forget about the window manager (!!) and the workspace configuration. I don't log in/out that often, and generally I don't care much about restarting applications, but the window manager being missing is of course pretty annoying. I like xfce because it's simple and unobtrusive and usually works pretty well. I've never experienced this, and I've got two other machines also running 11.04 with pretty much the same setup (straight Ubuntu install with xfce4 packages added). Is there some good way to diagnose stuff like that? edit — well I nuked my session cache, did an explicit save from the session widget, and now it works. Well, it doesn't save the workspace location for each client and instead opens them all up on the first workspace, but I think that may be because, in the session, xfwm4 is the last thing in the "Client" list, so before it's started all the other clients just pile up in the first (and only) workspace. I'm still curious about how exactly it gets so messed up. I certainly wasn't knowingly attempting anything fancy or unorthodox, though I may have done something fishy inadvertently.

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• Alt-Tab looses focus and have to hit Alt-Grave Accent to get focus

  - by John Hamill

  Alt-Tab looses focus and have to hit Alt-Grave Accent to get focus I have ubuntu 12.4 with Unity window manager. I have a gvim window and a firefox window open. I hit Alt-Tab to switch between the two. Sometimes the gvim window doesn't have focus and I have to hit Alt-GraveAccent (Alt-`) to get the gvim window to have focus (ie: have the cursor a solid white square instead of a outline of a square) I do this to move between firefox where I highlight some text and do a copy, then Alt-Tab to gvim and do a paste. Sometimes the focus isn't in gvim and the paste doesn't work. I then have to do an Alt-graveAccent to get the focus into gvim or click the gvim window. These extra steps slow my process down and it makes it difficult to get into a smooth rythum. I saw this: ALT+TAB loses focus Maybe the Alt-GraveAccent may help someone. It's a unity bug: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1035628 Your best bet is to wait until an update comes through fixing it.

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• Is 12.10 ready from prime time?

  - by Mikey

  I recently installed 12.10 - dual boot using Wubi. I had numerous stability problems: many sporadic, unaccounted for system errors, software that was installed and then seemed to disappear from App Launcher, etc. Machine is new HP quad with 4 gig memory - wonderful piece of hardware - definitely no hardware problems there. I went back to 12.04 (installed from ISO image, not Wubi) and it's rock solid - never any issues at all. Is 12.10 not ready for prime time? Are there fixes-updates in the pipe? Should I get a DVD disc and install 12.10 from ISO instead of Wubi? New to Linux/Ubuntu after 20 years on MS/Windows and loving it - I develop in C++ and Python - maybe will try Lazarus since I know Delphi. Would like to use the latest and greatest Ubuntu but I will not sacrifice stabilty. Are there known problems with 12.10? Would using the standard install instead of Wubi help? Seems a lot of users are voting down this question - not sure why since other users have confirmed problems.

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• How was Git designed?

  - by Mark Canlas

  My workplace recently switched to Git and I've been loving (and hating!) it. I really do love it, and it is extremely powerful. The only part I hate is that sometimes it's too powerful (and maybe a bit terse/confusing). My question is... How was Git designed? Just using it for a short amount of time, you get the feel that it can handle many obscure workflows that other version control systems could not. But it also feels elegant underneath. And fast! This is no doubt in part to Linus's talent. But I'm wondering, was the overall design of git based off of something? I've read about BitKeeper but the accounts are scant on technical details. The compression, the graphs, getting rid of revision numbers, emphasizing branching, stashing, remotes... Where did it all come from? Linus really knocked this one out of the park and on pretty much the first try! It's quite good to use once you're past the learning curve.

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• Dual LAN Printing

  - by Christopher

  I want to use Ubuntu 10.10 Server in a classroom, a computer lab whose bandwidth is provided by a local cable ISP. That's no problem, though the school network has an IP printer that I want to use. I cannot reach the printer through the cable Internet. But, I have two network cards. How is it possible to use both networks at once? eth0 (static 192.168.1.254) is plugged into a four-port router, 192.168.1.1. On the public side of the four-port router is Internet provided by the cable company. I also have the classroom workstations plugged into a switch. The switch is plugged into the four-port router. The whole classroom is wired into the cable Internet. The other NIC, eth1, could it be plugged into an Ethernet jack in the wall? It uses the school network, and I might receive by DHCP an IP address like 10.140.10.100, with the printer on maybe 10.120.50.10. I was thinking about installing the printer on the server so that it could be shared with the workstations. But how does this work? Can I just plug eth1 into the school network and access both LANs? Thanks for any insight, Chris

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• yet another question about migrating to Java

  - by aloneguid

  Hi, There are plenty similar questions, but maybe responses to this one will save a developer's life :) I want to migrate to Java. The reasons are very clear: all the .NET vacancies are client and windows oriented (Silverlight developer, ASP.NET developer, WPF developer etc.) and none of them are any interest to me. I worked with .NET since it's beginning as our company decided to invest in .NET having C++ stack and all the natual problems, so I was just blindly following and actually enjoyed it as the products were mostly server oriented with mixed C++/C# code. Today I have beforementioned problem - can't find an inspiring job. I'd rather kill myself than start working on a Silverlight or WPF project. Searching Java vacancies shows promising results, however they all require a huge java-related technology stack and experience. The question is is there any chance to find a job quickly and without dramatic salary drop (I know that Java guys are usually better paid, so there must be a kind of a credit) and if not, how must time and effort does it take to migrate (my .NET knowledge mostly includes server-oriented technologies like NHibernate, WCF, threading, sockets, ASP.NET web services, Enterprise Library, NInject etc etc etc, and (still) some C++ leftovers). Thanks!

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• yet another question about migrating to Java

  - by aloneguid

  Hi, There are plenty similar questions, but maybe responses to this one will save a developer's life :) I want to migrate to Java. The reasons are very clear: all the .NET vacancies are client and windows oriented (Silverlight developer, ASP.NET developer, WPF developer etc.) and none of them are any interest to me. I worked with .NET since it's beginning as our company decided to invest in .NET having C++ stack and all the natual problems, so I was just blindly following and actually enjoyed it as the products were mostly server oriented with mixed C++/C# code. Today I have beforementioned problem - can't find an inspiring job. I'd rather kill myself than start working on a Silverlight or WPF project. Searching Java vacancies shows promising results, however they all require a huge java-related technology stack and experience. The question is is there any chance to find a job quickly and without dramatic salary drop (I know that Java guys are usually better paid, so there must be a kind of a credit) and if not, how must time and effort does it take to migrate (my .NET knowledge mostly includes server-oriented technologies like NHibernate, WCF, threading, sockets, ASP.NET web services, Enterprise Library, NInject etc etc etc, and (still) some C++ leftovers). Thanks!

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• Is this kind of Design by Contract useless?

  - by Charlie Pigarelli

  I've just started informatics university and I'm attending a programming course about C(++). The programming professor prefers to teach very few things (in 3 month we have just reached the functions topic) and connect every topic with a type of programming design that somehow is similar to the Design by Contract design. Basically what he ask us to do is to write every exercise with comments Pre-conditions, Post-conditions and Invariants that should prove the correctness of each program we write. But this doesn't make any sense to me. I mean, ok: maybe writing down your thoughts prevent you from doing some mistakes, but if this is all an abstract thing, then if your program intuition is wrong you'll write your program wrong and then you'll also write pre and post conditions wrong probably auto convincing your self about its correctness. Most of the time, both me and other students have written programs that seemed ok and that had correct pre and post condition too. But at the moment of testing it was just completely wrong. I had some experience before this course of programming and I had written a lot of line of code before and I found myself comfortably with just writing a program and unit test it. It take less time to accomplish and is less "abstract" than just thinking about what every single piece of your program should do in every case (which is kinda like mentally testing it). Finally, all this pre and post conditions takes me like 80% of the total time of the exercise. It's harder to think about putting down this pre and post correct than to write the program itself. Since we are like the only course of the only university probably in the entire world that makes this things, could someone please tell me how should I manage this thing? Am I right thinking that this doesn't worth anything? Should I change university? (there are like double of the people attending that course and it seems that usually very few people passes the exam the first year). Should I convince myself it's method is right?

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• Ubuntu not shutting down ( going to black screen ) 12.04

  - by Orrin Fox

  I am currently using a USB persistent install of ubuntu. its a simple 4GB drive with a 2.8GB partition ( casper-rw storage partition ). I setup an administrator account and set it to login automatically. I also removed ubiquity to simply use this as a go anywhere install. Heres my issue. Im logged in as my account, and I click the top right gear and select "shut down". Text pops up showing its quitting processes.. etc. and then goes to the plymouth animation. But... The screen goes black, and then it goes to the login screen. Now when im at the login screen i go into terminal ( alt+F2 ) and dont you know, im logged in as Ubuntu. so then I try the following: ubuntu@ubuntu:~$ sudo shutdown now It goes to the plymouth screen again as if its shutting down, AND the screen goes black once again but the computer has not turned off, as in the usb is still flashing the light, the fans are still on, the only thing off is the screen. Is this a bug? If not maybe i did something wrong? Perhaps its that I made an account but... if there is a work around for this please let me know. Thanks again, Fox

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• Design Pattern Advice for Bluetooth App for Android

  - by Aimee Jones

  I’m looking for some advice on which patterns would apply to some of my work. I’m planning on doing a project as part of my college work and I need a bit of help. My main project is to make a basic Android bluetooth tracking system where the fixed locations of bluetooth dongles are mapped onto a map of a building. So my android app will regularly scan for nearby dongles and triangulate its location based on signal strength. The dongles location would be saved to a database along with their mac addresses to differentiate between them. The android phones location will then be sent to a server. This information will be used to show the phone’s location on a map of the building, or map of a route taken, on a website. My side project is to choose a suitable design pattern that could be implemented in this main project. I’m still a bit new to design patterns and am finding it hard to get my head around ones that may be suitable. I’ve heard maybe some that are aimed at web applications for the server side of things may be appropriate. My research so far is leading me to the following: Navigation Strategy Pattern Observer Pattern Command Pattern News Design Pattern Any advice would be a great help! Thanks

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• How does a segment based rendering engine work?

  - by Calmarius

  As far as I know Descent was one of the first games that featured a fully 3D environment, and it used a segment based rendering engine. Its levels are built from cubic segments (these cubes may be deformed as long as it remains convex and sides remain roughly flat). These cubes are connected by their sides. The connected sides are traversable (maybe doors or grids can be placed on these sides), while the unconnected sides are not traversable walls. So the game is played inside of this complex. Descent was software rendered and it had to be very fast, to be playable on those 10-100MHz processors of that age. Some latter levels of the game are huge and contain thousands of segments, but these levels are still rendered reasonably fast. So I think they tried to minimize the amount of cubes rendered somehow. How to choose which cubes to render for a given location? As far as I know they used a kind of portal rendering, but I couldn't find what was the technique used in this particular kind of engine. I think the fact that the levels are built from convex quadrilateral hexahedrons can be exploited.

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• Flash player stops working in Firefox

  - by Alin

  First of all please be merciful as I am a 2 days ubuntu user. I've only used Windows OSs before. Hardware configuration -Quad Core Q6600 CPU -4 GB RAM -Geforce 8800GT 512 MB RAM -Seagate 320GB Harddisk I installed ubuntu x64 and everything went smooth. I had Adoble flash player installed from Ubuntu Software Center. The problem is that the flash videos on youtube (basically on all pages) looked pixelate. I use Firefox 3.6 that came with ubuntu by default. After reading around here I saw something about overriding hardware acceleration but that didn't work either. Or maybe I just didn't do it correctly. The problem was that if I opened 2-3 youtube tabs, when closing one of them, in 95% of the cases, the flash plugin would crash in remaining tabs and a black screen was instead of the video. After doing some more search I discovered the FlashAid extension for Firefox. I installed it and it made an update of flash plugin. Now the videos look good but now each time I watch a video, when switching to another one the flash plugin crashes and I can see insead of the vide the firefox message with Plugin has crasshed, refresh the page. Basically this is what I miss to have a complete pleasant ubuntu experience. Any ideas how to fix this? Thank you

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• Global vs. Local Monthly Searches in Adwords keyword tool

  - by Gregory

  I'm trying to learn how to use a keyword tool in Adwords. Here's what I entered: Country- Russia Language-Russian Desktop and laptop devices And the keyword was ???? ? ??????? (tours to Israel in Russian Cyrillic letters) . As a broad match type... Now... the results that I got were: Global monthly: 60,500 Local monthly: 40,500 If I got it right..."Global monthly" means in this context : worldwide average monthly searches for this search term in ANY language in any Google search site (google.ru, google.com.ua, google.com, google.fr etc.). It's all nice, BUT... Then I made an query for tours to Israel in English in the US...And I got: Global monthly: 60,500 Local monthly: 27,100 That doesn't make any sense to me though! How come the total sum (the global) is actually a smaller number than a combined sum of just TWO countries??? (27,100+40,500=67,60060,500) By "any language" they mean a translation of the term into ANY possible language???Or maybe by "language" Google means the language of searchers' operating system? or their browsers' language?

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• Bad at math, feeling limited

  - by Peter Stain

  Currently I'm a java developer, making websites. I'm really bad at math, in high school I got suspened because of it once. I didn't program then and had no interest in math. I started programming after high school and started feeling that my poor math skills are limiting me. I feel like the programming's not that hard for me. Though web development in general is not that hard, i guess. I've been doing Spring and Hibernate a lot. What i'm trying to ask is : if I understand and can manage these technologies and programming overall, would it mean that I have some higher than average prerequisite for math and details? Would there be any point or would it be easy for me to take some courses in high school math and get a BSc in math maybe? This web development is really starting to feel like not my cup of tea anymore, i would like to do something more interesting. I'm 25 now and feel like stuck. Any help appreciated.

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• Whats after the iPAD?? check out the new Augmented Reality Glasses

  - by Stephen Slade

  Everyone loves their new iPad! The rich features, portability, plethora of apps and ease of use make this the new clipboard on the factory floor or electronic notebook for meetings. But how many business people walk into an hours meeting and really start typing notes on their PC?..yes some do, but for the general business public there are new technologies coming down the road. The iPad is the latest holla-hoop; and the next gen device I feel is the Augmented Reality Glasses. Your glasses will be your screen, have an earpiece, be wireless enabled, your smart watch be your electronics and maybe your belt can be an extended battery pack.  I'm anxious to test one of these. The TELEGRAPH writes:  "Android software is believed to power the gadget, enabling similar features to its smartphone and tablets. A 3G /4G data connection, motion sensors and GPS navigation are believed to be included in the device's capabilities. The augmented-reality glasses are the culmination of a two-year initiative called Project Glass, developed in the clandestine Google X lab, ..in Mountain View, ...The New York Times suggested they could cost between $250-$500 " http://www.telegraph.co.uk/technology/news/9187547/Google-unveils-augmented-reality-glasses.html

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• Need help deciding if Joomla! experience as a good metric for hiring a particular prospective employee.

  - by Stephen

  My company has been looking to hire a PHP developer. Some of the requirements for the job include: an understanding of design patterns, particularly MVC. some knowledge of PHP 5.3's new features. experience working with a PHP framework (it doesn't matter which one). I interviewed a man today who's primary work experience involved working with Joomla!. As an employee, he will be required to work on existing and new web applications that use Zend Framework, CakePHP and/or CodeIgniter. It is my opinion that we shouldn't dismiss hiring a developer just because he has not used the same technologies that he'll be using on the job. So, I'd like to know about the kind of coding experience working with Joomla! can provide. I've never bothered to take more than a brief look (if that) at the Joomla! package, so I'm hoping to lean on the knowledge of my peers. Would you consider Joomla! to contain a professional code-base? Is the package well organized, and/or OO in general, or is it more like WordPress where logic and presentation are commingled? When working with Joomla!, is the developer encouraged to use best practices? In your opinion, would experience working with Joomla! garner the skills needed to get up to speed with Zend or CakePHP quickly, or will there be a steep learning curve ahead of the developer? I'm not saying that Joomla! is a bad technology, or even that it is lower on the totem pole when compared to the frameworks I've mentioned. Maybe it's awesome, I dunno. I simply have no idea!

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• It's raining development VirtualBox images again!

  - by pieter.humphrey

                                              The cloud has burst.. forecast is looking like large amounts of VirtualBox images are coming down from OTN.   Are you finding the install for Database, WebLogic, SOA or WebCenter to be complicated when your goal is simply to setup a development sandbox?  Sick of giving your credit card info to cloud vendors, only to be stuck in a walled garden where you can't connect to your own internal systems?   Are you new to Java and just wanted something technical to sink your teeth into?  Or maybe you just want to put some stuff on that new terabyte drive you got? ;) Have no fear.  VirtualBox 4.0 is here.  We've have several development (read: don't use in production) images that were designed for use for in-person events, but we're posting them for your enjoyment.  Some of the images have step by step hands on labs baked into them too!  So get a freeware download manager like BitComet, install VirtualBox, an MD5 checksum utility (if you are on windows) and get wet!   del.icio.us Tags: java,development,java ee,java fx,virtualBox,virtualization,database,soa,weblogic,jdeveloper,eclipse,netbeans,sql developer,times ten,zend,php,SOA,SOA Suite,BPM,BAM,B2B,hudson,maven,subversion,Eclipse,Solaris,OTN Technorati Tags: java,development,java ee,java fx,virtualBox,virtualization,database,soa,weblogic,jdeveloper,eclipse,netbeans,sql developer,times ten,zend,php,SOA,SOA Suite,BPM,BAM,B2B,hudson,maven,subversion,Eclipse,Solaris,OTN

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• Your personal backlog

  - by johndoucette

  Whenever I start a new project or come in during a hectic time to help salvage a deliverable – there is always a backlog. Generating the backlog can be a daunting exercise, but worth the effort. Once I have a backlog, I feel in control and the chaos begins to quell. In your everyday life, you too should keep a backlog. Here is how I do it; 1. Always carry a notebook 2. Start each day marking a new page with today’s date 3. Flip to yesterday’s notes and copy every task with an empty checkbox next to it, to the new empty page (today) 4. As the day progresses and you go to meetings, do your work, or get interrupted to do something…jot it down in today’s page and put an empty checkbox next to it. If you get it done during the day, awesome. Mark it complete. Keep carrying and writing every task to each new day until it is complete. Maybe one day, you will have an empty backlog and your sprint will be complete!

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