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  • XSLT Built-in Template Rules for attributes

    - by Martin Smith
    I'm sure that this is an extremely basic question but here goes anyway! I have read that the built in template rule for text and attribute nodes in XSLT is <xsl:template match="text()|@*"> <xsl:value-of select="."/> </xsl:template> However for the source document <?xml version="1.0"?> <booker> <award> <author blah="test">Aravind Adiga</author> <title>The White Tiger</title> <year>2008</year> </award> </booker> And XSLT <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text"/> </xsl:stylesheet> I get the following output applying the transform in Visual Studio. Can someone please explain why I don't see "test" in the output? Aravind Adiga The White Tiger 2008

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  • Hyper-V cluster VS regular cluster

    - by Sasha
    We need to choice between Hyper-V and regular cluster technologies. What is the advantage and disadvantage of these approaches? Update: We have to physical servers and want to build reliably solution using cluster approach. We need to clustering our application and DB (MS SQL). We know that we can use: Regular Windows Cluster Service. Application and DB will be migrating from one node to other. Hyper-V Failover Cluster. Virtual machine will be migrating from one node to other. Combined variant. DB mirroring for MS SQL and Hyper-V for our application. We need to make a choice between this approach. So we need to know advantage and disadvantage of these approaches?

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  • non-interactively upload file to sftp server, using password

    - by matt
    Hello Guys, I know, this is not the recommended way to do this. But, I do not have another choice: I've got to set up a cron job that will regularly upload a file to an external SFTP Server (no FTP available, and I do only have a username/password for it but no key.) Still, I need to set up a cron that will regularly connect to that sftp and upload a file. sftp <<EOF put filename exit EOF therefore will not work, because sftp asks for the password, before STDIN is evaluated. What can I do, to pass the Password to sftp? Again: I am aware of the potential security risk, but I really do not have any choice here, and the server from which the file is uploaded is protected rather well.

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  • Enable file download via redirect in IE7

    - by Christian W
    Our application enables our customers to download files to their computer. The way I have implemented it is using asp.net with a dropdown. When the user clicks the dropdown they get the choice of "PDF","Powerpoint", and a couple of other choices depending on circumstances. Then, in postback depending on the choice the user made, it will return a file (changing the content-header and such and then bitbanging a file to the user). This works perfectly in all browsers, but IE7 complains that this is a security risk and blocks the download. Is there any way for the users to authorize downloads from our webapplication?

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  • CentOS Vs Windows Server 2008

    - by Steve
    Hi, Apologies if the question appears ambiguous, I have little experience in this area and was after some informed opinions. I am deploying a test scenario of a server/client network and need to make some choices for Server. The client will be a Windows system as it meets the requirements for the client, the server choice has more room for selection. From my experience with Linux in general and the appealing nature of open source for low cost, security etc and the availability and performance of database and web server programs I have been considering CentOS as a server choice. I have the ability to make most of the choices of what software / server packages I wish to install. This includes Active Directory (something I have no experience with). How well does this operate with Windows clients? Am I being too selective and creating unnecessary complication by setting out not to use a Windows Server OS?

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  • Complicated SQL query

    - by Yandawl
    Please bare with me this is difficult to explain xD http://img90.imageshack.us/i/croppercapture1.png/ This is based on an undergraduate degree course where a student takes many units (say 4 core units and 1 optional unit per year). tblAwardCoreUnits and tblAwardOptUnits store which units are optional and core for which award, hence the relationship to tblAward and tblStudentCoreUnits and tblStudentOptUnits store the particular instances of those units which a particular student is taking. Secondly, a unit can have multiple events (say a lecture and a unit) and each of those events has sessions in which a student can attend, hence tblEvents, tblSessions and tblAttendances. The query I am trying to produce is to get a list of all level one students, grouped by their award that lists the percentage of attendances in all the units in the current level. I've tried and tried with this and the following is the best I've managed to come up with so far... I'd REALLY appreciate any help you can give with this! SELECT tblStudents.enrolmentNo, tblStudents.forename, tblStudents.surname, tblAwards.title, (SELECT COUNT((tblAttendances.attended + tblAttendances.authorisedAbsence)) AS SumOfAttendances FROM tblAttendances INNER JOIN (tblStudents ON tblStudents.enrolmentNo = tblAttendances.enrolmentNo)) / FROM tblUnits, tblAwards INNER JOIN ((tblStudents INNER JOIN tblStudentOptUnit ON tblStudents.studentID = tblStudentOptUnit.studentID) INNER JOIN tblStudentCoreUnit ON tblStudents.studentID = tblStudentCoreUnit.studentID) ON tblAwards.awardID = tblStudents.awardID WHERE (((tblStudents.level)="1") AND ((tblStudents.status)="enrolled")) GROUP BY tblAwards.title ORDER BY tblStudents.forname;

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  • Internet Explorer defaults to 64-bit version

    - by Tim Long
    My IE8 has suddenly started defaulting to the 64-bit version. I have no idea how or why this has happened, but I suspect it might be linked to the Browser Choice Screen that Microsoft was recently forced to display by EU law. However, many web sites will not display correctly in IE8 x64 (eg. sites that use Adobe Flash or Microsoft Silverlight). I have the 32-bit version of IE pinned to my taskbar and if I launch it manually, everything is fine. But when I click on a URL from another program and IE is not already running, then the 64-bit version gets launched. This really messes with programs like BBC iPlayer which rely heavily on Adbobe Air and Flash. So, how do I get IE8 32-bit version to be the default version again? I've tried using the "default programs" control panel and that doesn;t make any difference (in fact, it doesn't give the choice between x84 and x64 versions, it just lists "internet explorer").

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  • how can udp data can passed through RS232 in ansi c?

    - by moon
    i want to transmit and receive data on RS232 using udp and i want to know about techniques which allow me to transmit and receive data on a faster rate and also no lose of data is there? thanx in advance. i have tried but need improvements if possible #include <stdio.h> #include <dos.h> #include<string.h> #include<conio.h> #include<iostream.h> #include<stdlib.h> #define PORT1 0x3f8 void main() { int c,ch,choice,i,a=0; char filename[30],filename2[30],buf; FILE *in,*out; clrscr(); while(1){ outportb(PORT1+0,0x03); outportb(PORT1+1,0); outportb(PORT1+3,0x03); outportb(PORT1+2,0xc7); outportb(PORT1+4,0x0b); cout<<"\n==============================================================="; cout<<"\n\t*****Serial Communication By BADR-U-ZAMAN******\nCommunication between two computers By serial port"; cout<<"\nPlease select\n[1]\tFor sending file \n[2]\tFor receiving file \n[3]\tTo exit\n"; cout<<"=================================================================\n"; cin>>choice; if(choice==1) { strcpy(filename,"C:\\TC\\BIN\\badr.cpp"); cout<<filename; for(i=0;i<=strlen(filename);i++) outportb(PORT1,filename[i]); in=fopen(filename,"r"); if (in==NULL) { cout<<"cannot open a file"; a=1; } if(a!=1) cout<<"\n\nFile sending.....\n\n"; while(!feof(in)) { buf=fgetc(in); cout<<buf; outportb(PORT1,buf); delay(5); } } else { if(choice==3) exit(0); i=0; buf='a'; while(buf!=NULL) { c=inportb(PORT1+5); if(c&1) { buf=inportb(PORT1); filename2[i]=buf; i++; } } out=fopen(filename2,"t"); cout<<"\n Filename received:"<<filename[2]; cout<<"\nReading from the port..."; cout<<"writing to file"<<filename2; do { c=inportb(PORT1+5); if(c&1) { buf=inportb(PORT1); cout<<buf; fputc(buf,out); delay(5); } if(kbhit()) { ch=getch(); } }while(ch!=27); } getch(); } }

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  • What applications is NTFS preferable for? [closed]

    - by javano
    When building a new server I prefer to deploy Linux as my OS of choice. This gives me the luxury of being able to choose from various file systems (amongst other aspects), and I will choose a different FS for different servers, depending on what they will be used for. With Windows OS variants you can only use NTFS. Have any benchmarks or tests been performed that have shown NTFS to be a preferable choice for a given scenario or application (apart from just "running Windows" because it has to be on NTFS). To clarify what I mean; I might use filesystem X for large transactional storage volumes, but filesystem Y for front end web app servers. If I had a multi-platform application to deploy that (let's pretend) was available on Mac/Win/Lin, is there any type of application or scenario that would benefit from being on NTFS?

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  • Deploying virtual machines - Windows Guest/Linux Host or vice versa?

    - by samoz
    I'm looking to deploy several virtual machines for users. They need access to both Windows and Linux. They also need to use the computers graphics card (for Photoshop, modeling, etc) under Windows. My question is, will an Ubuntu host/Windows guest or a Windows host/Ubuntu guest be faster? I'm somewhat worried about Windows getting a cluttered registry and slow, but on the otherhand, a Windows host would have direct access to hardware (Unless I'm just unaware of how to grant hardware access to a guest). Does the choice of software (VMware or VirtualBox) effect the choice?

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  • Resetting default Input Method in Mac OS 10.6

    - by Tim Visher
    I'm a Dvorak guy. I recently installed a new machine at the inlaws who are not Dvorak people. I stupidly selected Dvorak as my Input Method of choice while installing OS X. Now, all of the users I created default to Dvorak and need to go through the manual process of removing Dvorak as their Input Method of choice and instead choosing U.S. I have no idea how far reaching the implications might be. Could be that any time another user is added they will default to Dvorak. Right now, I'd like to set the default back to U.S. How can I do that? Behaviors I'm looking for include that when the Input Menu is not shown at the Login Screen, U.S. is the keyboard layout. Any future users created should default to U.S. with no Input Menu in the menu bar. Any users created already should have their default layout be U.S. Thanks in advance!

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  • What's wrong with cplusplus.com?

    - by Kerrek SB
    This is perhaps not a perfectly suitable forum for this question, but let me give it a shot, at the risk of being moved away. There are several references for the C++ standard library, including the invaluable ISO standard, MSDN, IBM, cppreference, and cplusplus. Personally, when writing C++ I need a reference that has quick random access, short load times and usage examples, and I've been finding cplusplus.com pretty useful. However, I've been hearing negative opinions about that website frequently here on SO, so I would like to get specific: What are the errors, misconceptions or bad pieces of advice given by cplusplus.com? What are the risks of using it to make coding decisions? Let me add this point: I want to be able to answer questions here on SO with accurate quotes of the standard, and thus I would like to post immediately-usable links, and cplusplus.com would have been my choice site were it not for this issue. Update: There have been many great responses, and I have seriously changed my view on cplusplus.com. I'd like to list a few choice results here; feel free to suggest more (and keep posting answers). As of June 29, 2011: Incorrect description of some algorithms (e.g. remove). Information about the behaviour of functions is sometimes incorrect (atoi), fails to mention special cases (strncpy), or omits vital information (iterator invalidation). Examples contain deprecated code (#include style). Inexact terminology is doing a disservice to learners and the general community ("STL", "compiler" vs "toolchain"). Incorrect and misleading description of the typeid keyword.

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  • Responsive website VS mobile website

    - by Saif Bechan
    I am creating a new blog. Nowadays, especially for a blog, it's important that the websites are accessible for all devices. Now I have to make a choice on what to do. I have seen 2 options. Option 1 is to go with a normal fixed website, for example 960px wide (grid960). And for mobile users have a mobile version. This takes some more time, but then there are 2 good versions of the website. Option 2 I haven't seen a lot yet, creating a adaptive website, or also called responsive website. I am now looking into the LESS framework, where the website automatically switches to to required width. Only downside is that when the normal browser is re-sized, everything re-sizes. Another problem I found is that pinch-to-zoom on devices does not work. Now the question is, which one would you prefer for a blog. One that constantly changes layout when you move your device, or one where you have the choice to view mobile and normal. If there are any other options, please let me know.

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  • intel atom getting too hot

    - by user59565
    I own an Asus 1215N which is getting very hot Intel Atom 525D dual core ION 2 (geforce 220 + GMA 3150) 4 GB RAM Ubuntu 12.04 it hits 86 C at idle. Some times (at load or turned on 1 hour) it shuts down due to heat, in Windows 7 it runs idle at 49 C. I tried an acpi call to shut down the nVidia chip which is cooled together with the Atom chip. That didn't solve the problem. To check up to see if it really turned off I checked how much power the laptop consumed, it only went from using 1400 mW to 860 mW, no changes in heat. I also tried reapply the standard heat adhesive, the old heat adhesive made it run at 97 (it couldn't even put up a useful install of Ubuntu). This really annoys me, as Ubuntu is the OS of choice to me. Should I try compile the kernel? Is it true that compile for a P4 is the better choice to the atom, when compiling the kernel for this processor architecture? Now I tried compiling the kernel for atom. Now temperature is 83 C (think the drop has more to do with ambient temp than the customized kernel) help appreciated

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  • Selecting a JAX-RS implementation for a new project

    - by Fernando Correia
    I'm starting a new Java project which will require a RESTful API. It will be a SaaS business application serving mobile clients. I have developed one project with Java EE 6, but I'm not very familiar with the ecosystem, since most of my experience is on the Microsoft platform. Which would be a sensible choice for a JAX-RS implementation for a new project such as described? Judging by Wikipedia's list, main contenders seem to be Jersey, Apache CXF, RESTeasy and Restlet. But the Comparison of JAX-RS Implementations cited on Wikipedia is from 2008. My first impressings from their respective homepages is that: CXF aims to be a very comprehensive solution (reminds me of WCF in the Microsoft space), which makes me think it can be more complex to understand, setup and debug than what I need; Jersey is the reference implementation and might be a good choice, but it's legacy from Sun and I'm not sure how Oracle is treating it (announcements page doesn't work and last commit notice is from 4 months ago); RESTeasy is from JBoss and probably a solid option, though I'm not sure about learning curve; Restlet seems to be popular but has a lot of history, I'm not sure how up-to-date it is in the Java EE 6 world or if it carries a heavy J2EE mindset (like lots of XML configuration). What would be the merits of each of these alternatives? What about learning curve? Feature support? Tooling (e.g. NetBeans or Eclipse wizards)? What about ease of debugging and also deployment? Is any of these project more up-to-date than the others? How stable are them?

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  • How relevant are Brainbench scores when evaluating candidates?

    - by Newtopian
    I've seen many companies using certification services such as Brainbench when evaluating candidates. Most times they use it as a secondary screen prior to interview or as a validation to choose between candidates. What is your experience with Brainbench scores? Did you try the tests yourself, and if so do you feel the score is meaningful enough to be used as part of a hiring process? Difficult choice. Consensus seems to be that BB cert are not very good as a certification. The biggest argument was around the fact that some of the questions are too precise to form a good evaluation. this view can probably be tempered somewhat but still, to hold someone's future solely on the results of this evaluation would be irresponsible. That said, I still think it is possible to use them properly to gain additional objective knowledge on a candidate's level of expertise provided the test is done in a controlled environment ensuring that all taking it stand on equal footing. Thus I went with the answer that best reflected this view keeping in mind that it is still just an hour long 50ish multiple choice question to evaluate skills and knowledge that take years to acquire. To be taken with a grain of salt ! In short, The tests have value but weather or not they are worth the money is another debate. Thanks all for your time.

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  • Get Trained on Oracle VM Server for x86 in your timezone or location

    - by Antoinette O'Sullivan
    Register now to get trained on Oracle VM Server for x86 in your location or timezone - and frequently in your local language. You have a choice between the 3 day course, Oracle VM Administration: Oracle VM Server for x86, providing you with a wide range of hands-on exercises or a 1 day seminar, Oracle VM with Oracle VM Server for x86 Seminar. And you have a choice of attending these instructor-led courses Live from your desk through Oracle Universities Live Virtual Classes. For these virtual events there are hundreds of scheduled events across many timezones and there is no need to travel! Schedule details available on the Oracle University portal and visit the Virtualization space. In a classroom with a subset of scheduled events shown below:  Where  When  Delivery Language  3 day Hands-On Course      Dusseldorf, Germany  6 August 2012  German  Munich, Germany  9 July 2012  German  Paris, France  17 October 2012  French  Sydney, Australia  3 September 2012  English  Denver, United States  30 July 2012  English  Roseville, United States  25 June 2012  English  1 day Seminar      Paris, France  4 September 2012  French  Roseville, United States  15 June 2012  English  Mexico City, Mexico  20 June 2012  Spanish To find additional classes, go to the Oracle University portal and visit the Virtualization space. Should you not find an event on the schedule that suits you, register your interest for a specific event/date.

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  • Join the SOA and BPM Customer Insight Series

    - by Dain C. Hansen
    Summer is here! So put on your shades, kick back by the pool and watch the latest SOA and BPM customer insight series from Oracle. You’ll hear directly from some of Oracle’s most well respected customers across a range of deployments, industries, and use cases. You’ve heard us tell you the advantages of Oracle SOA and Oracle BPM. But this time, listen to what our customers are saying: See Rain Fletcher, VP of Application Development and Architecture at Choice Hotels, describe how they successfully made the transition from a complex legacy environment into a faster time-to-market shared services infrastructure as they implemented their event-driven Google API project. Listen to the County of San Joaquin, California discuss how they transformed to a services-oriented architecture and business process management platform to gain efficiency and greater visibility of mission critical information important to citizen public safety. Hear from Eaton, a global power management company, review innovative strategies for a successful application integration implementation, specifically the advantages of transitioning from TIBCO to using Oracle SOA and Oracle Fusion Applications.  Learn how Nets Denmark A/S implemented Oracle Unified Business Process Management Suite in just five months. Review the implementation overview from start to production, including integration with legacy systems. And finally, listen to Farmers Insurance share their SOA reference architecture as well as a timeline for how their services were deployed as well as the benefits for moving to an Oracle SOA-based application infrastructure.  Don’t miss the webcast series. Catch the first one on June 21st at 10AM PST with Rain Fletcher from Choice Hotels, and Bruce Tierney, Director Oracle SOA Suite. Register today!

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  • Java Not Recognized As Default Application

    - by John
    I just installed java according to this article, and 'java -version' displays java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode) 'update-alternatives --config java' returns this: There are 2 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/bin/gij-4.6 1046 auto mode 1 /usr/bin/gij-4.6 1046 manual mode * 2 /usr/local/java/jdk1.7.0_07/bin/java 1 manual mode Press enter to keep the current choice[*], or type selection number: with update-alternatives --config javac (or javaws) returning similarly. however java isn't listed in the default applications menu when I click on a .jar file and go to "open with application". I tried to install java this way, and on the update-alternatives part of the command returned me: /etc/alternatives/[java,javac,javaws] is dangling, it will be updated with best choice I just confirmed that I can use java, as 'java -jar file.jar' does work. Just figured that I'd mention it, don't know why I didn't before, but when I right click on a .jar file, java 7 run-time isn't even listed there, it seems that the file-manager isn't recognizing it as a program, but it is there, and it does work...

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  • Do I need to uninstall lxde before installing kde-standard?

    - by A Roy
    I have ubuntu 12.04 (upgraded from 10.04) and since I disliked the default desktop, I installed lxde (sudo apt-get install lxde). This was good except that occasionally there would be trouble with Firefox (blinking on panel) so that finally I had to close it and then a error message from Ubuntu was issued. I had asked about it before but there was no useful response so now I want to move to another desktop which will hopefully not create the problem I have now. My doubt is, should I first uninstall lxde and then install kde (sudo apt-get install kde-standard) or is it enough to install kde without uninstalling lxde? In case it is necessary to uninstall, should I use the command sudo apt-get remove lxde or is there a better command for it? You may also help me with choice of desktop. I installed lxde since this is simple and lightweight. I am assuming that kde will not be as simple but hopefully not create problem like above. But I hate if it takes too long to log in or to launch a program like Firefox etc and also there should not be icons fixed on the left part of terminal (I hate to keep icons on desktop since these are distracting). Some of these issues were present with default Ubuntu 12.04. So is my choice of kde-standard appropriate or are there better desktop alternatives?

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  • Fixed-Function vs Shaders: Which for beginner?

    - by Rob Hays
    I'm currently going to college for computer science. Although I do plan on utilizing an existing engine at some point to create a small game, my aim right now is towards learning the fundamentals: namely, 3D programming. I've already done some research regarding the choice between DirectX and OpenGL, and the general sentiment that came out of that was that whether you choose OpenGL or DirectX as your training-wheels platform, a lot of the knowledge is transferrable to the other platform. Therefore, since OpenGL is supported by more systems (probably a silly reason to choose what to learn), I decided that I'm going to learn OpenGL first. After I made this decision to learn OpenGL, I did some more research and found out about a dichotomy that I was somewhere unaware of all this time: fixed-function OpenGL vs. modern programmable shader-based OpenGL. At first, I thought it was an obvious choice that I should choose to learn shader-based OpenGL since that's what's most commonly used in the industry today. However, I then stumbled upon the very popular Learning Modern 3D Graphics Programming by Jason L. McKesson, located here: http://www.arcsynthesis.org/gltut/ I read through the introductory bits, and in the "About This Book" section, the author states: "First, much of what is learned with this approach must be inevitably abandoned when the user encounters a graphics problem that must be solved with programmability. Programmability wipes out almost all of the fixed function pipeline, so the knowledge does not easily transfer." yet at the same time also makes the case that fixed-functionality provides an easier, more immediate learning curve for beginners by stating: "It is generally considered easiest to teach neophyte graphics programmers using the fixed function pipeline." Naturally, you can see why I might be conflicted about which paradigm to learn: Do I spend a lot of time learning (and then later unlearning) the ways of fixed-functionality, or do I choose to start out with shaders? My primary concern is that modern programmable shaders somehow require the programmer to already understand the fixed-function pipeline, but I doubt that's the case. TL;DR == As an aspiring game graphics programmer, is it in my best interest to learn 3D programming through fixed-functionality or modern shader-based programming?

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  • More Tables or More Databases?

    - by BuckWoody
    I got an e-mail from someone that has an interesting situation. He has 15,000 customers, and he asks if he should have a database for their data per customer. Without a LOT more data it’s impossible to say, of course, but there are some general concepts to keep in mind. Whenever you’re segmenting data, it’s all about boundary choices. You have not only boundaries around how big the data will get, but things like how many objects (tables, stored procedures and so on) that will be involved, if there are any cross-sections of data (do they share location or product information) and – very important – what are the security requirements? From the answer to these types of questions, you now have the choice of making multiple tables in a single database, or using multiple databases. A database carries some overhead – it needs a certain amount of memory for locking and so on. But it has a very clean boundary – everything from objects to security can be kept apart. Having multiple users in the same database is possible as well, using things like a Schema. But keeping 15,000 schemas can be challenging as well. My recommendation in complex situations like this is similar to a post on decisions that I did earlier – I lay out the choices on a spreadsheet in rows, and then my requirements at the top in the columns. I  give each choice a number based on how well it meets each requirement. At the end, the highest number wins. And many times it’s a mix – perhaps this person could segment customers into larger regions or districts or products, in a database. Within that database might be multiple schemas for the customers. Of course, he needs to query across all customers, that becomes another requirement. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • Inspiring the method of teaching. Example- C++ :)

    - by Ashwin
    A year ago I graduated with a degree in Computer Science and Engineering. Considering C++ as the first choice of programming language I have been in the process of learning C++ in many ways. At first - five years back - I had many conceptions, most of which were so abstract to me. It started when I knew almost everything about Structs in C and nothing about Classes in C++. I went through a great time experimenting them all and learning a lot. I had a hard time evaluating Procedural programming vs Object-Oriented Programming. Deciding when to choose Procedural or Object-Oriented Programming took a great deal of patience for me. I knew that I cannot underestimate any of these Programming styles... Though Procedural programming is often a better choice than simple sequential unstructured programming, when solving problems with procedural programming, we usually divide one problem into several steps in order regarded as functions. Then we call these functions one by one to get the result of the problem. When solving problems with Object Oriented Priciples we divide one problem into several classes and form the interaction between them. Evaluating these two at the beginning (as a learner) required a lot of inspiration and thoughts. Instructing to think step by step. Relative concepts to understand deeply. Intensive interests to contrast both solving in both POP and OOP. If you were ever a mentor: What ideas/methods would you teach to students in which it will Inspire them to learn a programming language (in general, computer sciences)?

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  • Proper updating of GeoClipMaps

    - by thr
    I have been working on an implementation of gpu-based geo clip maps, but there is a section of the GPU Gems 2 article that i just can't seem to understand, specifically this paragraph and more precisely the bolded part: The choice of grid size n = 2k-1 has the further advantage that the finer level is never exactly centered with respect to its parent next-coarser level. In other words, it is always offset by 1 grid unit either left or right, as well as either top or bottom (see Figure 2-4), depending on the position of the viewpoint. In fact, it is necessary to allow a finer level to shift while its next-coarser level stays fixed, and therefore the finer level must sometimes be off-center with respect to the next-coarser level. An alternative choice of grid size, such as n = 2k-3, would provide the possibility for exact centering Let's take an example image from the article: My "understanding" of the way the clip maps were update was that you floor the position of the viewpoint to an int, and such get the center vertex point if this is not the same as the previous center point, you update the entire map. Now, this obviously is not the case - but what I am failing to understand is this: If you look at the image above, if the viewpoint was to move one unit to the right, then the inner ring (the one just around the view point + white center square) would end up getting a 1 unit space on both the left and right side of itself. But there is nothing in the paper that deals with this, what i mean is that it would end up looking like this (excuse my crummy cut-and-paste editing of the above image): This is obviously not a valid state of the. So, would the solution be that a clip ring (layer) can only move in increments of the ring/layer it's contained within? Wouldn't this end up being very restrictive? I feel like I am missing some crucial understanding of parts of the algorithm, but I have been over both this paper and the original paper from 2004 and I just can't see what I am not getting.

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