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• Why does DirectX use a left-handed coordinate system?

  - by greyfade

  I considered posting on Stack Overflow, but the question strikes me as being far too subjective since I can't think of a reasonable technical explanation for Microsoft's choice in this matter. But this question has bugged me for so long and the issue keeps coming up in one of my projects, and I have never actually seen an attempt at explaining this: OpenGL uses a right-handed coordinate system, where the +Z part of the world coordinate system extends toward the viewer. DirectX uses a left-handed system where the +Z part of the world coordinate extends into the screen, away from the viewer. I never used the Glide API, so I don't know how it worked, but from what I can gather, it uses a left-handed system as well. Is there a technical reason for this? And if not, is there some conceptual advantage to a particular handedness of a coordinate system? Why would one choose one over the other?

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• Why does this exported cube have too many vertices?

  - by Joewsh

  I'm trying to export md5mesh models. Just as a test I decided to export a simple cube (i.e. with 8 vertices). When I opened the .md5mesh file it lists the following: numverts 24 numtris 12 numweights 24 Obviously the number of triangles makes sense: 6 faces * 2 to triangulate = 12. The model only has one bone so again it even makes sense that there is one weight for each vertex. The question is though, why is the file listing 24 vertices? Is the problem the exporter or is this normal for md5mesh's? Is it something that you have to rectify when you come to parsing the file in engine? I don't want to be parsing or drawing duplicated vertices without reason. I'm guessing it's something to do with shading and normals. Is it a case of listing each vert 3 times, one for each facing normal?

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• ubuntu 14.04 slow

  - by TURN A

  so i upgraded to ubuntu 14.04 from 12.04 with a usb but i have internet ,my computer is really slow at 1024x768 definition ,everything works super slow ,windows closing and opening and streaming videos ,everything ive used so far.but it works fine at 800x600 definition ,i want it to be fine at the higher definition ,how do i make it run well at 1024x768 ? in additional drivers nothing shows ,and my computer mirrors by default for some reason ,i tried stopping it from mirroring but most buttons dont want to work and weird glitches happen ,the system doesnt work well when not mirroring , i dont care if it mirrors or not i just want good performance .thank you in advance for any answers !! here are the computer specs Processor 1.8 GHz 8032 RAM 2 GB DDR3 Memory Speed 1066 MHz Hard Drive 32 GB Graphics Coprocessor Graphics Media Accelerator HD Wireless Type 802.11B, 802.11G, 802.11n Number of USB 2.0 Ports 4 Expand Other Technical Details Brand Name Asus Item model number EB1030-B003L Hardware Platform Linux Operating System Ubuntu Item Weight 1.5 pounds Item Dimensions L x W x H 1.14 x 6.70 x 8.60 inches Color Black Processor Brand Intel Processor Count 1 Computer Memory Type DDR3 SDRAM Flash Memory Size 32 Hard Drive Interface Solid State Optical Drive Type No

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• Would it be practical/secure to import my GPG keys into (Open)SSH?

  - by InkBlend

  I know a bit about computer security, and well as about the concept of public and private keys. I also know that both GPG and (Open)SSH use the public/private key system. My question is, is there any reason that I would not want to use my GPG keys as authentication for SSH? Please note that, while a have a little bit more experience with Linux, GPG, and SSH than the average computer user, I am by no means an expert. Please be patient and point out any mistakes that you might see.

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• How do I swap two objects in a GC language without triggering GC?

  - by TenFour04

  I have two array lists. that I want to swap each frame. My question is, does the variable 'temp' need to be a member variable to avoid triggering GC, assuming this method is called on dozens of objects each frame? I'm not creating a new object, just a new reference to an object. public void LateUpdate(){ ArrayList<int> temp = previousFrameCollisions; previousFrameCollisions = currentFrameCollisions; currentFrameCollisions = temp; currentFrameCollisions.clear(); } I've been told there's no reason to make a primitive into a member variable just to avoid GC, so my best guess is that this also applies to object references.

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• Particle system lifetimes in OpenGL ES 2

  - by user16547

  I don't know how to work with my particle's lifetimes. My design is simple: each particle has a position, a speed and a lifetime. At each frame, each particle should update its position like this: position.y = position.y + INCREMENT * speed.y However, I'm having difficulties in choosing my INCREMENT. If I set it to some sort of FRAME_COUNT, it looks fine until FRAME_COUNT has to be set back to 0. The effect will be that all particles start over at the same time, which I don't want to happen. I want my particles sort of live "independent" of each other. That's the reason I need a lifetime, but I don't know how to make use of it. I added a lifetime for each particle in the particle buffer, but I also need an individual increment that's updated on each frame, so that when PARTICLE_INCREMENT = PARTICLE_LIFETIME, each increment goes back to 0. How can I achieve something like that?

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• PCManFM problems: shuts down unexpectedly, would not always start [closed]

  - by cipricus

  In Lubuntu 12.04 beta (final release in a few days). I do not remember doing something outrageous to my PCManFM but now it has has a lot of problems: "extract here" menu action wouldn't work (this problem never disappears) the program shuts without obvious reason making the desktop empty (the program can be started in run (alt-f2) but this does not alway restore the desktop) would not start sometimes from its /usr/share/applications.desktop file (or the "Aplication Launch Bar") although it starts in run (alt-f2) (the last problem is temporarily solved if the program is closed in task manager and than restarted with alt-f2) I have reinstalled it to no avail. Any ideas?

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• Installing 12.10 on Dell r710

  - by user115490

  I have been trying to install Ubuntu 12.10 on a Dell r710. I have 6 disks in each 2 TB. I setup a raid 5 in the HW raid controller with all drives, and proceeded with the OS install. When the partitioner runs it fails to create / for some reason. I then tried just setting up a simple raid 1 with 2 drives in the HW controller, and doing the OS install again. The installer runs fine this time. Once trying to boot I then get a kernel panic of 'Target File System doesn't have requested /sbin/init' as well as a bunch of 'deleted inode referenced'. Can someone tell me what I am doing wrong here?

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• When do I bite the bullet and hire a developer? [closed]

  - by Paul Seattle

  I have an awesome URL, I've had it since the mid 90's, and up until around 2002 I was having an awesome time writing music reviews and features into static pages and adding their URL to static index pages and everything was just great. Then things got complicated really fast, and for one reason or another I handed the site over to a very talented friend who turned it into a db based site run by cf. Now, here I am around twelve years later putting it all back together using mysql, php and css on a need-to-learn basis and even though I'm sooo close to where I want it to be I realize, erm, it should have been written using mysqli etc etc ad infinitum. So I'm wondering at what point do I just give in and hire a developer to take over, how much does it even cost, and how do I know I'm working with someone who is better than I am?

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• Nexus S 4g not detected by computer

  - by Newbie in over his head

  A little bit of a disclaimer, I have very little knowledge of the correct terminology for some of the things I'm going to ask about, and I apologize in advance I have a Nexus S 4g phone that is, at the moment of writing, connected to my 11.10 computer through its USB charger cable. In the past, connecting the phone like this has allowed me to transfer files between my computer and my phone; I'm able to get my music onto my phone, and my photos onto my computer, for example. For some reason, this has stopped working. My phone still charges its battery when connected to the computer, but neither the computer nor the phone recognized that they are connected. Is there something I can do to get the phone and the computer to detect each other? I don't know how to fix this, and it's more than a little frustrating. Any help would be greatly appreciated.

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• Advise some swing based (open source) project to join

  - by user592704

  I am looking for some open source Swing based projects which wanted volunteer Java developers to join and the projects which show their products authors' names. I watched many links but most projects for some reason hide their authors names (showing some nick names or something...) and all developing process relative information... For example this one project it seems fine but still I couldn't find any information concerning some current project task(s), its developers group, some chronicles (tips, milestones, feedbacks etc) :( I googled a lot but found less :S So I wondering maybe you know some? I dearly hope you can give me a piece of advice Any useful comment is much appreciated

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• Does anyone use 12.04 with HD 6950?

  - by Midori

  Back when I first tried to switch from Windows to Ubuntu (6-7 months ago) I had several graphics related problems. The VGA was overheating, graphic glitches, video playing issues, slow/choppy window movements etc. After 2-3 reinstalls, hours of playing with different drivers/settings I decided to return to Windows :\ Now I want to give it another shot. But before I start to format, partitioning, backup and other time consuming stuff I wanted to ask if anyone using the 12.04 with HD 6950. Can I utilize the full potential of it, or the drivers are still not good enough? I know that Linux isn't meant to play games in the first place, but the games I playing (SC2, BLC, HoN, DotA 2) are working with wine as far as I know (or aren't?) and I can't find any reason not to switch from Windows if I can utilize the full potential of my config in Ubuntu. So anyone who got experiences with this VGA in Ubuntu please reply. Thanks in advance :)

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• Why compiz or unity refresh screen by every movement I do? [closed]

  - by Behzadsh

  It's getting me crazy! compiz or unity refresh screen (like I run compiz --replace or unity --replace) by every movement I do (e.g ctrl+tab, super+w) and somehow unexpectedly! sometimes it failed to reload title bar and keyboard functions like ctrl+tab and alt+F2 stop working, and I had no chance but reboot! Sometimes it work without any problem. I couldn't found any reason why this happen. I wanted to report a bug but I don't have enough information about it.

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• Switching to an external display, when primary is broken

  - by Shazzner

  I've successfully install Ubuntu 11.10 Desktop (x86) on an old(er) laptop that unfortunately has a broken screen, so there is an external monitor plugged in. On the livecd it come up on the secondary display just fine and I was able to install ubuntu and everything. Unfortunately when I reboot into Ubuntu proper now, the secondary display is off and I'm literally driving blind here trying to switch it to the secondary display. Using Nvidia open source drivers. Things I've tried: Rebooting back into livecd, mounting the partition and trying in vain to find a config file (it uses the open source drivers so no Xorg.conf I could edit manually) Trying to blind-type xrandr settings into what I hope is terminal: xrandr --output VGA1 --auto (nothing happened) Trying to blind install openssh-server so I could ssh into it and maybe configure it from my working computer. For some reason though, no luck. Ubuntu really should default to expanding to all screens for this use case.

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• GMail API for a small app (Rails? Javascript? PHP?)

  - by kurtybot

  I want to create an app that accesses the GMail API, but I'm finding that it isn't as simple as I thought it might be. I'm hoping somebody in the community here might have some experience working with one of these API's and could not only recommend the right solution, but also show me to some tutorials or examples that could help me get up and running. Here are some of the requirements of this app: Preferably in Rails or Javascript or even PHP. I am open to other technologies as well, but hope they'd be easy to implement. Connects to gmail via Oauth Can read who emails have been sent to and received from. Basically would like to perform some analytics on who emails are sent to, when and how frequently. I've read that one reason why this isn't easy, and why there isn't an official javascript API provided by gmail, is that google is concerned it's going to make their service less performant for their users.

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• Why do so many people dislike C++?

  - by General K

  Beginners and professional, on blogs, in forums and chatrooms - people say it everywhere: C++ oh dear god no The short form of the question: For what reason is C++ so widely disliked and people are horrified by the imagination of using it for some project? I have been using a lot of different languages, including C++ by now, and I can only say that I really like it. I'm far more horrified by Delphi than by C++. Actually, I find it's an almost perfect, compiled language! I've been doing a lot of different projects in C++ as well, ranging from 3D video games to webservers and emulators for old video game consoles. And I still do not see the problem everyone else seems to have with it! It was hard for me to get into it of course, as it is quite complex and has a lot of depth, but after that it's simply great.

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• Do you feel that you, as a programmer, make a difference?

  - by gablin

  When I graduate from uni my desire is to land a job where I feel that what I do as a programmer makes a difference and contribute to the project. My code, no matter how small, is useful to the project, is being used by the project, and takes it forward. My work matters and thus I feel that I make a difference. In contrast, one of my fears is that my work just doesn't matter. Either it is just meaningless to the project but you're told to do it anyway, or your code is useful but not used in the project, or you feel that the project as a whole is just pointless, for whatever reason. Is this something that you've experienced, or are experiencing? Do you feel that you, as a programmer, make a difference, or do you feel that what you do just doesn't matter?

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• CSS being Displayed by Google spiders

  - by vipul_vj

  I have written an article HTML Image Tag for the site and it has been indexed by Google. But when I search it, google displays HTML Image Tag - ProgrammingBulls http://programmingbulls.com/html-image-tag-1: content { font-family:verdana; font-size:14px; font-weight:normal } We often use images in a webpage. To insert images in our webpage < img tag is used in. Why is CSS displayed in the google search? I know that CSS and HTML is ignored by Google but due to some reason HTML is being displayed.

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• Cannot access my own web page

  - by enflam3

  I am developing, learning and experimenting with php,html,javascript,flash and so on. Having web hosting and all of the cpanel, phpmyadmin and other utilities. One day, while updating information, connection between my computer and website just went down. I found out that it is only from this computer, where I cannot access anything. I don't know what is the reason I cannot access website, however this is what I have checked so far: Everything else opens normally, having problem only with my page. Cannot access FTP,cpanel or any kind of information related to the domain and hosting ipconfigs detects IP, but shows request timed out (so its not browser related) Turned off Firewall,AV, Rebooted computer Cleared caches,temp,cookies,histry with CCleaner Checked connectivity with both (wired,wireless) networks ISP has dynamic IP that has been changed about 3 times since issue Checked host file I am out of ideas and understanding what could cause this kind of issue, however couple minutes ago, found out that everything works with proxy server (when adding IP and port to the browsers) Can someone point out what should I check or try to get rid of this problem?

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• How to fix “Install-SPSolution: Admin SVC must be running in order to create deployment timer job”

  - by ybbest

  When I try to install a SharePoint Solution using PowerShell, I got the error “How to fix Install-SPSolution: Admin SVC must be running in order to create deployment timer job”. The reason you got error is that SharePoint 2010 Administration is not started, so to fix it you just need to start the services. Problem: Solution: To fix the issues, you need to start the SharePoint 2010 Administration service. 1. Go to services control panel. 2. Start the SharePoint 2010 Administration service. 3. Rerun your PowerShell, it should fix the problem. However, you might get another problem “A deployment or retraction is already under way for the solution “*.wsp”, and only one deployment or retraction at a time is supported”, for this problem you can check my other blog here.

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• Is there ever a time when creating a level/world editor with your game is a bad idea?

  - by Borgel

  I have created a few smaller games on my own in the past. My approach has always been to create a completed editor where it has all the functionality needed to save a level file and load it into the game. This has always made most sense to me but I keep hearing from people that a game is never fully done in the editor. I have never worked in a game development team and so I don't have first hand experience, but not adding everything needed to make the game to the editor just seams wrong. Am I missing something? Is there ever a reason not to add a tool to the editor?

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• Jumping around to work on different features when you get stuck, is it a source of project failures?

  - by codecompleting

  On personal projects (or work), if one gets stuck on a problem, or waiting to figure out a solution to the problem, if you jump to another section of your code, don't you think it will be a good reason your application will be buggy or worse yet never get completed? Assuming you are not using git and code each feature to a specific branch, things can get out of hand since you have 3 different features you are working on, and you have unresolved issues in each. So when you get done to work, you get stressed out because you have these hanging issues and half-baked code lingering about. What's the best way to avoid this problem? (if you have it) I'm guessing using something like git and creating a branch per feature is the safest way to avoid this bad habit. Any other suggestions?

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• Will URL encoding the image names affect Google

  - by TheGateKeeper

  Just wondering if it makes any difference to Google whether or not I URL encode the image names when linking to them. For example if I have an image named "test-1234-!.jpg", does it make a difference if I name it refer to it as "test-1234-%21.jpg"? The reason I am asking is because I am doing a major shift in the way my website works and while all new image names will not be URL encoded, all of the past ones are. I want to see if it is worth it renaming all of them or if I should just leave it like that.

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• One subdomain is not working

  - by BFTrick

  Hello there, My main domain works just fine - www.example.com and a subdomain set up by another developer works as well - sub1.example.com. But when I try to set another subdomain up I go through the process everything seems to work. The software creates the default files where the subdomain files should go. But when I try to browse there it doesn't work. My host uses Plesk to do all of the hosting stuff. What do you think the problem is? I doubt it is some sort of cache issue because I had problems on my phone which I tried after problems on the pc. Maybe for some reason Plesk needs time to set this up? I have used Cpanel before and that works instantly.

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• Accepting a numerical range in a function call

  - by dekpos

  I have encountered two ways of doing it: void foo(int from, int to); /* 'from' inclusive, 'to' exclusive */ void foo(int startIndex, int rangelength); Has one style historically been preferred over the other? If so, was it just a matter of convention or was it due to some deeper underlying reason? I'm currently programming in Java and noticed that the Arrays class uses the former style. The exclusivity of the to argument felt somewhat unintuitive to me, which led me to ask this question.

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