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• Biggest mistake you've ever made

  - by Rogue Coder

  Similar to the question I read on Server Fault, what is the biggest mistake you've ever made in an IT related position. Some examples from friends: I needed to do some work on a production site so I decided to copy over the live database to the beta site. Pretty standard, but when I went to the beta site it was still pulling out-of-date info. OOPS! I had copied the beta database over to the live site! Thank god for backups. And for me, I created a form for an event that was to be held during a specific time range. Participants would fill out the form for a chance to win, and we would send the event organizers a CSV from the database. I went into the database, and found ONLY 1 ENTRY, MINE. Upon investigating, it appears as though I forgot an auto increment key, and because of the server setup there was no way to recover the lost data. I am aware this question is similar to ones on Stack Overflow but the ones I found seemed to receive generic answers instead of actual stories :) What is the biggest coding error/mistake ever…

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• Software development process for a part time University project for 1 developer?

  - by Pricey

  I will be doing a part time University project soon and the time frame for it is around 8 months with approximately 10-15 hours a week spent working on it, with a review by a tutor each quarter. My question is what software development process would you recommend using when the course requires you to work on your own in order to manage yourself as well as the project? I wanted to use a weekly or bi-weekly iterative approach to my work but a lot of the processes seem tailored to teams of people. I am looking at XP (Extreme Programming) OR Scrum as something that is less than the norm for University work but again Scrum I don't know a lot about yet, and a question I have is; can you say you are doing XP without pair-programming? because my tutor seems to think that I have to stick to all the practices otherwise I can't do it (nevermind if I am working alone). We can have external user input as well but due to the small timescales with part time work it may be more beneficial for myself to be the user as well, which is not what I prefer considering how I can get lost in the design.

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• Managing constant buffers without FX interface

  - by xcrypt

  I am aware that there is a sample on working without FX in the samplebrowser, and I already checked that one. However, some questions arise: In the sample: D3DXMATRIXA16 mWorldViewProj; D3DXMATRIXA16 mWorld; D3DXMATRIXA16 mView; D3DXMATRIXA16 mProj; mWorld = g_World; mView = g_View; mProj = g_Projection; mWorldViewProj = mWorld * mView * mProj; VS_CONSTANT_BUFFER* pConstData; g_pConstantBuffer10->Map( D3D10_MAP_WRITE_DISCARD, NULL, ( void** )&pConstData ); pConstData->mWorldViewProj = mWorldViewProj; pConstData->fTime = fBoundedTime; g_pConstantBuffer10->Unmap(); They are copying their D3DXMATRIX'es to D3DXMATRIXA16. Checked on msdn, these new matrices are 16 byte aligned and optimised for intel pentium 4. So as my first question: 1) Is it necessary to copy matrices to D3DXMATRIXA16 before sending them to the constant buffer? And if no, why don't we just use D3DXMATRIXA16 all the time? I have another question about managing multiple constant buffers within one shader. Suppose that, within your shader, you have multiple constant buffers that need to be updated at different times: cbuffer cbNeverChanges { matrix View; }; cbuffer cbChangeOnResize { matrix Projection; }; cbuffer cbChangesEveryFrame { matrix World; float4 vMeshColor; }; Then how would I set these buffers all at different times? g_pd3dDevice->VSSetConstantBuffers( 0, 1, &g_pConstantBuffer10 ); gives me the possibility to set multiple buffers, but that is within one call. 2) Is that okay even if my constant buffers are updated at different times? And do I suppose I have to make sure the constantbuffers are in the same position in the array as the order they appear in the shader?

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• What stops HTML5 and JS apps to perform as good as native apps?

  - by Amogh Talpallikar

  From what I understand, HTML is a mark-up language, so is the content of XAML, XIB and whatever Android uses and other native UI development frameworks. JavaScript is a programming language used along with it to handle client side scripting which will include things like event handling, client side validations and anything else C#,Java,Objective-C or C++ do in various such frameworks. There are MVC/MVVM patterns available in form frameworks like Sencha's, Angular etc. We have localStorage in form of both sqlite and key-value store as other frameworks have and you have API specification for almost everything that it missing. Whenever a native UI frameworks has to render UI , it has to parse a similar the markup and render the UI. Question break-down What stops from doing the same in HTML and JS itself ? Instead of having a web-control or browser as a layer in between why can't HTML(along with CSS) and JS be made to perform the same way ? Even if there is a layer,so does .net runtime and JVM are in other cases where C++,C are not being used. So Lets take the case of Android, like Dalvik, why Can't Chromium be another option(along with dalvik and NDK) where HTML does what android markup does and JavaScript is used to do what Java does ? So the Question is, Even if current implementations aren't as good, but theoretically is it possible to get HTML5 based applications to work as other native apps specially on mobile ?

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• What does "fully supported" mean in context of Radeon Opensource Video Driver?

  - by stevecoh1

  UPDATE: This is not a request for support of my specific issue. Details of that issue are here: How to recover from bad upgrade to 13.04 (Unity very slow) . I have "solved" that issue, for the time being anyway, by loading alternative lighter weight desktops. This question was opened specifically to question the meaning of the documentation at https://help.ubuntu.com/community/RadeonDriver . END OF UPDATE There it is, in Black and White: https://help.ubuntu.com/community/RadeonDriver Fully Supported All these Radeon(HD) cards and derivatives have good 3D acceleration support. This is not an exhaustive list: ... RV610/RV630 Radeon HD 2400/2600/2700/4200/4225/4250 Yet in my case (the HD2400) this proves to be manifestly untrue, at least if "Fully Supported" means sufficient to run Unity in Ubuntu 13.04. It runs all the applications I can launch under Unity, but Unity itself is unbearably slow. It's quite striking really. Click on the "Dash" - go get a cup of coffee. Type a key in the Unity search box, wait five seconds for it to appear. Type Alt-tab and wait five seconds for the screen to finish painting. None of these issues appear outside of Unity components. As you all know, there are complaints about slow performance all over the Internet about Unity. Shouldn't this page somehow address this issue? Especially if "fully supported" doesn't mean sufficiently to run the default modern Ubuntu release. What does "fully supported" mean?

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• Building a Redundant / Distributed Application

  - by MattW

  This is more of a "point me in the right direction" question. My team of three and I have built a hosted web app that queues and routes customer chat requests to available customer service agents (It does other things as well, but this is enough background to illustrate the issue). The basic dev architecture today is: a single page ajax web UI (ASP.NET MVC) with floating chat windows (think Gmail) a backend Windows service to queue and route the chat requests this service also logs the chats, calculates service levels, etc a Comet server product that routes data between the web frontend and the backend Windows service this also helps us detect which Agents are still connected (online) And our hardware architecture today is: 2 servers to host the web UI portion of the application a load balancer to route requests to the 2 different web app servers a third server to host the SQL Server DB and the backend Windows service responsible for queuing / delivering chats So as it stands today, one of the web app servers could go down and we would be ok. However, if something would happen to the SQL Server / Windows Service server we would be boned. My question - how can I make this backend Windows service logic be able to be spread across multiple machines (distributed)? The Windows service is written to accept requests from the Comet server, check for available Agents, and route the chat to those agents. How can I make this more distributed? How can I make it so that I can distribute the work of the backend Windows service can be spread across multiple machines for redundancy and uptime purposes? Will I need to re-write it with distributed computing in mind? I should also note that I am hosting all of this on Rackspace Cloud instances - so maybe it is something I should be less concerned about? Thanks in advance for any help!

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• Tips about how to spread Object Oriented practices

  - by Augusto

  I work for a medium company that has around 250 developers. Unfortunately, lots of them are stuck in a procedural way of thinking and some teams constantly deliver big Transactional Script applications, when in fact the application contains rich logic. They also fail to manage the design dependencies, and end up with services which depend on another large number of services (a clean example of Big Ball of Mud). My question is: Can you suggest how to spread this type of knowledge? I know that the surface of the problem is that these applications have a poor architecture and design. Another issue is that there are some developers who are against writing any kind of test. A few things I'm doing to change this (but I'm either failing or the change is too small are) Running presentations about design principles (SOLID, clean code, etc). Workshops about TDD and BDD. Coaching teams (this includes using sonar, findbugs, jdepend and other tools). IDE & Refactoring talks. A few things I'm thinking to do in the future (but I'm concern that they might not be good) Form a team of OO evangelists, who disseminate an OO way of thinking in differet teams (these people would need to change teams every few months). Running design review sessions, to criticise the design and suggest improvements (even if the improvements are not done because of time constraints, I think this might be useful) . Something I found with the teams I coach, is that as soon as I leave them, they revert back to the old practices. I know I don't spend a lot of time with them, usually just one month. So whatever I'm doing, it doesn't stick. I'm sorry this question is spattered with frustration, but the alterative to write this was to hit my head on the wall until I pass out.

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• My Visual Studio Demo Video Link disappeared &ndash; How do I get it back?

  - by Tarun Arora

  ***Special thanks to Adam Cogan for asking this question and to Andrew Bragdon for answering this question on the ALM Champs list.*** 1. Problem – The link to demo videos will disappear once you have watched the video Learning Visual Studio has become easier than ever with the Visual Studio How to Videos hosted inside of Visual Studio showing up in the context of the task you are trying to achieve. For instance when you click code review in team explorer you can see the link “Streaming Video: Using Code Review to improve quality” when you click this link the video stream is delivered to you right with in Visual Studio. Next time you run Visual Studio you will notice that the home page has a check mark in the video “Using Code Review to improve quality”. If you navigate to code review in the myWork hub in the team explorer, you will notice that the link “Streaming Video: Using Code Review to improve quality” does not show up any more.         2. Solution – How to get the Demo Videos link back Warning: Editing the registry can lead to serious problems if not done correctly.  Always backup your registry before editing. This solution is neither suggested nor supported by Microsoft. Type regedit on the run command prompt to open the Registry editor Navigate to the path Computer\HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\11.0\UltimateStartPage\VideoState and notice the newly created folder “TeamExplorer.CodeReview”, notice the key Watched is set to 1.         Change the value of the key ‘Watched’ to 0 Restart Visual Studio and Navigate to Code Review in myWork hub and voila, the link to stream the video is back!            Watch and enjoy the Demo videos to your hearts content!

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• Zoom Layer centered on a Sprite

  - by clops

  I am in process of developing a small game where a space-ship travels through a layer (doh!), in some situations the spaceship comes close to an enemy space ship, and the whole layer is zoomed in on the two with the zoom level being dependent on the distance between the ship and the enemy. All of this works fine. The main question, however, is how do I keep the zoom being centered on the center point between the two space-ships and make sure that the two are not off-screen? Currently I control the zooming in the GameLayer object through the update method, here is the code (there is no layer repositioning here yet): -(void) prepareLayerZoomBetweenSpaceship{ CGPoint mainSpaceShipPosition = [mainSpaceShip position]; CGPoint enemySpaceShipPosition = [enemySpaceShip position]; float distance = powf(mainSpaceShipPosition.x - enemySpaceShipPosition.x, 2) + powf(mainSpaceShipPosition.y - enemySpaceShipPosition.y,2); distance = sqrtf(distance); /* Distance > 250 --> no zoom Distance < 100 --> maximum zoom */ float myZoomLevel = 0.5f; if(distance < 100){ //maximum zoom in myZoomLevel = 1.0f; }else if(distance > 250){ myZoomLevel = 0.5f; }else{ myZoomLevel = 1.0f - (distance-100)*0.0033f; } [self zoomTo:myZoomLevel]; } -(void) zoomTo:(float)zoom { if(zoom > 1){ zoom = 1; } // Set the scale. if(self.scale != zoom){ self.scale = zoom; } } Basically my question is: How do I zoom the layer and center it exactly between the two ships? I guess this is like a pinch zoom with two fingers!

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• Using template questions in a technical interview

  - by Desolate Planet

  I've recently been in an argument with a colleage about technical questions in interviews. As a graduate, I went round lots of companies and noticed they used the same questions. An example is "Can you write a function that determines if a number is prime or not?", 4 years later, I find that particular question is quite common even for a junior developer. I might not be looking at this the correct way, but shouldn't software houses be intelligent enought to think up their own interview questions. This may well be the case, but I've been to about 16 interviews as a graduate and the same questions came up in about 75% of them. This leads me to believe that many companies are lazy and simply Google: 'Template questions for interviewing software developers' and I kind of look down on that. Question: Is it better to use a sest of questions off some template or should software houses strive to be more original and come up with their own interview material? From my point of view, if I failed an inteview and went off and looked for good answers to the questions I messed up on, I could fly through the next interview if they questions are the same.

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• Why don't I have a loop error with these redirects?

  - by byronyasgur

  I know this may seem a bit of a question in reverse, but I actually don't seem to have a problem I just want to make sure before I proceed. I have 2 domains domain1.com and domain2.com and a directory my_directory at domain2.com. I have domain2.com setup as an "add on domain" in the cpanel account of domain1.com so that when I go to domain2.com I am taken to domain1.com/my_directory but the browser shows domain2.com in the addressbar so it looks and acts like and is a separate site. However when people browse to domain1.com/directory I want the address bar to show domain2.com not domain1.com/directory. So I put a redirect in the htaccess file to redirect domain1.com/directory to domain2.com and it works perfectly, but I think it shouldnt and I'm worried I've done something wrong. My question is this: domain2.com was already redirected to domain1.com/directory in the first place (I see the redirect in my cpanel under addon domains) so by adding the second redirect in the htaccess file I should be creating a loop! Could somebody please set my mind at rest and show me why not?

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• How long can you be out of the MS market before it affects your career [closed]

  - by dave

  I've been working with .Net since it first came out and have done my best to use the latest and greatest things from Redmond. That being said, I've been working for the past year in the Python/Unix/Web world. In order to keep myself relevant in the MS world, I've been working part-time on a WPF project but I do not know how much longer that work will continue. So my question is: If I were to move totally to the Unix/Python/Web world, how long could I stay there before it starts getting hard to get another MS job? I am trying not to burn bridges in my career as I've found MS jobs pay better and tend to be more plentiful. PS: I like my Python job since it is something new and I get to work from home. It has provided a different view on coding that I've found useful. EDIT: I was out of the MS market for 12 months before attempting to get another MS job. No-one said "Gee you've been gone a while" but I did get a conspicuous lack of responses to job applications. My feeling is that the head-hunters do not bother to look beyond your last job. In the end, I got employment via my own network rather than the pimps. So, to answer my question: "not long, especially if you trust your career to head hunters."

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• How to break the "php is a bad language" paradigm? [closed]

  - by dukeofgaming

  PHP is not a bad language (or at least not as bad as some may suggest). I had teachers that didn't even know PHP was object oriented until I told them. I've had clients that immediately distrust us when we say we are PHP developers and question us for not using chic languages and frameworks such as Django or RoR, or "enterprise and solid" languages such as Java and ASP.NET. Facebook is built on PHP. There are plenty of solid projects that power the web like Joomla and Drupal that are used in the enterprise and governments. There are frameworks and libraries that have some of the best architectures I've seen across all languages (Symfony 2, Doctrine). PHP has the best documentation I've seen and a big community of professionals. PHP has advanced OO features such as reflection, interfaces, let alone that PHP now supports horizontal reuse natively and cleanly through traits. There are bad programmers and script kiddies that give PHP a bad reputation, but power the PHP community at the same time, and because it is so easy to get stuff done PHP you can often do things the wrong way, granted, but why blame the language?. Now, to boil this down to an actual answerable question: what would be a good and solid and short and sweet argument to avoid being frowned upon and stop prejudice in one fell swoop and defend your honor when you say you are a PHP developer?. (free cookie with teh whipped cream to those with empirical evidence of convincing someone —client or other— on the spot) P.S.: We use Symfony, and the code ends being beautiful and maintainable

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• Google analytics - drop in traffic

  - by user1001421

  Bit of a general question here. We are in the process of converting a number of our clients from older web sites to new ones. The problem we are getting, and sorry for being so general here, is we are getting a sharp decline in traffic as reported on Google Analytics. It's not a gradual decline, it seems to hit almost as soon as the new site goes live. I've just got a few questions to see if there is something we are doing wrong: a) We are using the same analytics accounts going from old to new site. Is this a bad idea? b) The actual analytics code is integrated into the pages using a server-side include. IS this a bad idea? c) We structure our sites differently to our old site. IE. The old sites would pretty must have all the web pages in the root directory, and hyperlinks would be linked to the page files: EG. <a href="somepage.aspx">Link</a> Our new sites now have a directory structure that pretty much reflects the navigation structure, and hyper links link to the pages directory instead of the actual page: EG. <a href="/new-items/shoes/">New shoes</a> Is this a bad idea. I'm really searching for a needle in a haystack here. Would appriciate any help or advice as to why we are getting such a sharp and sudden drop in traffic. Again, so this is such a general question. Thanks in advance.

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• Verfication vs validation again, does testing belong to verification? If so, which?

  - by user970696

  I have asked before and created a lot of controversy so I tried to collect some data and ask similar question again. E.g. V&V where all testing is only validation: http://www.buzzle.com/editorials/4-5-2005-68117.asp According to ISO 12207, testing is done in validation: •Prepare Test Requirements,Cases and Specifications •Conduct the Tests In verification, it mentiones. The code implements proper event sequence, consistent interfaces, correct data and control flow, completeness, appropriate allocation timing and sizing budgets, and error definition, isolation, and recovery. and The software components and units of each software item have been completely and correctly integrated into the software item Not sure how to verify without testing but it is not there as a technique. From IEEE: Verification: The process of evaluating software to determine whether the products of a given development phase satisfy the conditions imposed at the start of that phase. [IEEE-STD-610]. Validation: The process of evaluating software during or at the end of the development process to determine whether it satisfies specified requirements. [IEEE-STD-610] At the end of development phase? That would mean UAT.. So the question is, what testing (unit, integration, system, uat) will be considered verification or validation? I do not understand why some say dynamic verification is testing, while others that only validation. An example: I am testing an application. System requirements say there are two fields with max. lenght of 64 characters and Save button. Use case say: User will fill in first and last name and save. When checking the fields and Save button presence, I would say its verification. When I follow the use case, its validation. So its both together, done on the system as a whole.

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• Are Intel compilers really better than the Microsoft ones?

  - by Rocket Surgeon

  Years ago, I was surprised when I discovered that Intel sells Visual Studio compatible compilers. I tried it in particular for C/C++ as well as fantastic diagnostic tools. But the code was simply not that computationally intensive to notice the difference. The only impression was: did Intel really do it for me just now, wow, amazing tools with nanoseconds resolution, unbelievable. But the trial ended and the team never seriously considered a purchase. From your experience, if license cost does not matter, which vendor is the winner? It is not a broad or vague question or attemt to spark a holy war. This sort of question is about two very visible tools. Nobody likes when tools have any mysteries or surprises. And choices between best and best are always the pain. I also understand the grass is always greener argument. I want to hear all "what ifs" stories. What if Intel just locally optimizes it for the chip stepping of the month, and not every hardware target will actually work as well as Microsoft compiled? What if AMD hardware is the target and everything will slow down for no reason? Or on the other hand, what if Intel's hardware has so many unnoticable opportunities, that Microsoft compiler writers are too slow to adopt and never implement it in the compiler? What if both are the same exactly, actually a single codebase just wrapped into two different boxes and licensed to both vendors by some third-party shop? And so on. But someone knows some answers.

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• Creating a Website Without a Framework [closed]

  - by James Jeffery

  I've been using PHP Frameworks for so long that I've actually forgot the "best practices" for create websites without one. Usually I will use Symfony, or more recently I've been using Laravel. A client wants a very simple website, but with certain parts of it dynamic. Due to the nature of the site using Wordpress, or a Framework, is out of the question. I'm a sucker for priding myself on my code, but I feel like I'm asking such a basic question that it's killing me to ask. But, what are the best practices for creating websites without a Framework? I like to live by the K.I.S.S (Keep It Simple Stupid!) method of thinking. So, my idea was to just create the .php pages that are required, do any page processing or database interaction on that page, then have the HTML below the closing PHP tag. I would have any helpers/functions in a functions.php file. This is what I remember doing way before I was using Frameworks, and to me it seems like a very old school way of doing things. I've not created a site without a Framework for literally 2+ years, so I've lost my way with the basics. Any advice would be greatly appreciated.

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• Why do memory-managed languages retain the `new` keyword?

  - by Channel72

  The new keyword in languages like Java, Javascript, and C# creates a new instance of a class. This syntax seems to have been inherited from C++, where new is used specifically to allocate a new instance of a class on the heap, and return a pointer to the new instance. In C++, this is not the only way to construct an object. You can also construct an object on the stack, without using new - and in fact, this way of constructing objects is much more common in C++. So, coming from a C++ background, the new keyword in languages like Java, Javascript, and C# seemed natural and obvious to me. Then I started to learn Python, which doesn't have the new keyword. In Python, an instance is constructed simply by calling the constructor, like: f = Foo() At first, this seemed a bit off to me, until it occurred to me that there's no reason for Python to have new, because everything is an object so there's no need to disambiguate between various constructor syntaxes. But then I thought - what's really the point of new in Java? Why should we say Object o = new Object();? Why not just Object o = Object();? In C++ there's definitely a need for new, since we need to distinguish between allocating on the heap and allocating on the stack, but in Java all objects are constructed on the heap, so why even have the new keyword? The same question could be asked for Javascript. In C#, which I'm much less familiar with, I think new may have some purpose in terms of distinguishing between object types and value types, but I'm not sure. Regardless, it seems to me that many languages which came after C++ simply "inherited" the new keyword - without really needing it. It's almost like a vestigial keyword. We don't seem to need it for any reason, and yet it's there. Question: Am I correct about this? Or is there some compelling reason that new needs to be in C++-inspired memory-managed languages like Java, Javascript and C#?

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• What's the proper term for a function inverse to a constructor? Deconstructor, destructor, or something else?

  - by Petr Pudlák

  Edit: I'm rephrasing the question a bit. Apparently I caused some confusion because I didn't realize that the term destructor is used in OOP for something quite different - it's a function invoked when an object is being destroyed. In functional programming we (try to) avoid mutable state so there is no such equivalent to it. (I added the proper tag to the question.) Instead, I've seen that the record field for unwrapping a value (especially for single-valued data types such as newtypes) is sometimes called destructor or perhaps deconstructor. For example, let's have (in Haskell): newtype Wrap = Wrap { unwrap :: Int } Here Wrap is the constructor and unwrap is what? I've seen both, for example: ... Most often, one supplies smart constructors and destructors for these to ease working with them. ... at Haskell wiki, or ... The general theme here is to fuse constructor - deconstructor pairs like ... at Haskell wikibook (here it's probably meant in a bit more general sense). The questions are: How do we call unwrap in functional programming? Deconstructor? Destructor? Or by some other term? And to clarify, is this terminology applicable to other functional languages, or is it used just in the Has

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• Remote server's x menus without vino, vnc etc

  - by Fredde

  A question where both google searches, as well as askubuntu and ubuntu forums searches fails though rephrasing the question a number of times. Have a Lubuntu server with some storage and functions and a lubuntu laptop. Previous when running winXP, I had Xming, could start a x-session on the server, got the lxpanel on the laptop, switching, running x-programs without a hitch though the lxpanel menu. A very neat and convenient solution. However the winXP crashed, me moving to lubuntu also for the laptop. still things work, I ssh into the server and can start x-programs without a hitch. But, as with all graphical desktops, I at times need access to the lx menus on the server to find programs and here the problems arise, most finding I got talk about installing VNC, vino etc overkills, avoiding existing X-integration between the servers. I'll like to do as I did with Xming, see the menu system on the server, in my "client's" xwin? Just to see the servers installed software without colliding with the laptop X-server, just using it as normal X-apps.

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• Should a project start with the client or the server?

  - by MadBurn

  Pretty simple question with a complex answer. Should a project start with the client or the server, and why? Where should a single programmer start a client/server project? What are the best practices and what are the reasons behind them? If you can't think of any, what reasons do you use to justify why you would choose to start one before the other? Personally, I'm asking this question because I'm finishing up specs for a project I will be doing for myself on the side for fun. But now that I'm finishing this phase, I'm wondering "ok, now where do I begin?" Since I've never done a project like this by myself, I'm not sure where I should start. In this project, my server will be doing all the heavy lifting and the client will just be sending updates, getting information from the server, and displaying it. But, I don't want that to sway the answer as I'm looking for more of an in depth and less specific answer that would apply to any project I begin in the future.

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• Bounding volume hierarchy - linked nodes (linear model)

  - by teodron

  The scenario A chain of points: (Pi)i=0,N where Pi is linked to its direct neighbours (Pi-1 and Pi+1). The goal: perform efficient collision detection between any two, non-adjacent links: (PiPi+1) vs. (PjPj+1). The question: it's highly recommended in all works treating this subject of collision detection to use a broad phase and to implement it via a bounding volume hierarchy. For a chain made out of Pi nodes, it can look like this: I imagine the big blue sphere to contain all links, the green half of them, the reds a quarter and so on (the picture is not accurate, but it's there to help understand the question). What I do not understand is: How can such a hierarchy speed up computations between segments collision pairs if one has to update it for a deformable linear object such as a chain/wire/etc. each frame? More clearly, what is the actual principle of collision detection broad phases in this particular case/ how can it work when the actual computation of bounding spheres is in itself a time consuming task and has to be done (since the geometry changes) in each frame update? I think I am missing a key point - if we look at the picture where the chain is in a spiral pose, we see that most spheres are already contained within half of others or do intersect them.. it's odd if this is the way it should work.

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• Page Spamming via locations

  - by codemonkey

  Hi guys I am new here so please be gentle :) I have created a web page for a small mail order business. The page asks the reader if they are in need of a supplier for products in their "area" and if they have ever been let down by a supplier in that "area" etc. It also lists all the local villages and hamlets around the [area] where they can also supply too. This page is dynamically created and the [area] changes and so do the small towns that are local to the town. The page also contains information on the products so the word count vs town names is not stupid. An example of one of the URL would be www.website.com/1014/Halesowen/ It basically covers the whole of the UK so around 800 main towns with 28,000 local villages. The URL changes, so does the title and h1 tags, also each page is Geo coded for that town. My question really is this a good or bad idea? Is it a black hat technique ? I have been told if I have to ask the question then it probably is but the site does supply to all these areas just as any mail order company does and would like to get listed higher in each town for the products. I have seen this done on a few sites but only with a few targeted towns and not the whole of the UK so I would be really interested in your guys thoughts on this. I would post the URL to the site but as I am new here I am a bit unsure of the rules regarding posting links. The whole site needs a lot of other onsite SEO work doing and I will be doing that over the next few weeks. I look forward to your views on this. p.s. If I am allowed to post the URL without getting into trouble so you can see it someone let me know? Thanks in advance

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• XNA: How to make the Vaus Spacecraft move left and right on directional keys pressed?

  - by Will Marcouiller

  I'm currently learning XNA per suggestion from this question's accepted answer: Where to start writing games, any tutorials or the like? I have then installed everything to get ready to work with XNA Game Studio 4.0. General Objective Writing an Arkanoid-like game. I want to make my ship move when I press either left or right keys. Code Sample protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed) this.Exit(); // TODO: Add your update logic here #if WINDOWS if (Keyboard.GetState().IsKeyDown(Keys.Escape)) this.Exit(); else { if (Keyboard.GetState().IsKeyDown(Keys.Left)) MoveLeft(gameTime); } #endif // Move the sprite around. BounceEnergyBall(gameTime); base.Update(gameTime); } void MoveLeft(GameTime gameTime) { // I'm not sure how to play with the Vector2 object and its position here!... _vausSpacecraftPos /= _vausSpacecraftSpeed.X; // This line makes the spacecraft move diagnol-top-left. } Question What formula shall I use, or what algorithm shall I consider to make my spaceship move as expected left and right properly? Thanks for your thoughts! Any clue will be appreciated. I am on my learning curve though I have years of development behind me (already)!

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• Prevent Click Fraud in Advertisement system with PHP and Javascript

  - by CodeDevelopr

  I would like to build an Advertising project with PHP, MySQL, and Javascript. I am talking about something like... Google Adsense BuySellAds.com Any other advertising platform My question is mainly, what do I need to look out for to prevent people cheating the system and any other issues I may encounter? My design concept. An Advertisement is a record in the Database, when a page is loaded, using Javascript, it calls my server which in turn will use a PHP script to query the Database and get a random Advertisement. (It may do kore like get an ad based on demographics or other criteria as well) The PHP script will then return the Advertisement to the server/website that is calling it and show it on the page as an Image that will have a special tracking link. I will need to... Count all impressions (when the Advertisement is shown on the page) Count all clicks on the Advertisement link Count all Unique clicks on the Advertisement link My question is purely on the query and displaying of the Advertisement and nothing to do with the administration side. If there is ever money involved with my Advertisement buying/selling of adspace, then the stats need to be accurate and make sure people can't easily cheat the system. Is tracking IP address really the only way to try to prevent click fraud? I am hoping someone with some experience can clarify I am on the right track? As well as give me any advice, tips, or anything else I should know about doing something like this?

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