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  • Loading images in XNA 4.0; "Cannot Open File" Problems

    - by user32623
    Okay, I'm writing a game in C#/XNA 4.0 and am utterly stumped at my current juncture: Sprite animation. I understand how it works and have all the code in place, but my ContentLoader won't open my file... Basically, my directory looks like this: //WindowsGame1 - "Game1.cs" - //Classes - "NPC.cs" - Content Reference - //Images - "Monster.png" Inside my NPC class, I have all the essential drawing functions, i.e. LoadContent, Draw, Update. And I can get the game to find the correct file and attempt to open it, but when it tries, it throws an exception and tells me it can't open the file. This is how my code in my NPC class looks: Texture2D NPCImage; Vector2 NPCPosition; Animation NPCAnimation = new Animation(); public void Initialize() { NPCAnimation.Initialize(NPCPosition, new Vector2(4, 4)); } public void LoadContent(ContentManager Content) { NPCImage = Content.Load<Texture2D>("_InsertImageFilePathHere_"); NPCAnimation.AnimationImage = NPCImage; } The rest of the code is irrelevant at this point because I can't even get the image to load. I think it might have to do with a directory problem, but I also know little to nothing about spriting or working with images or animations in my code. Any help is appreciated. Not sure if I provided enough information here, so let me know if more is needed! Also, what would be the correct way to direct that Content.Load to Monster.png given the current directory situation? Right now I just have it using the full path from the C:// drive. Thanks in advance!

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  • How to Avoid a Busy Loop Inside a Function That Returns the Object That's Being Waited For

    - by Carl Smith
    I have a function which has the same interface as Python's input builtin, but it works in a client-server environment. When it's called, the function, which runs in the server, sends a message to the client, asking it to get some input from the user. The user enters some stuff, or dismisses the prompt, and the result is passed back to the server, which passes it to the function. The function then returns the result. The function must work like Python's input [that's the spec], so it must block until it has the result. This is all working, but it uses a busy loop, which, in practice, could easily be spinning for many minutes. Currently, the function tells the client to get the input, passing an id. The client returns the result with the id. The server puts the result in a dictionary, with the id as the key. The function basically waits for that key to exist. def input(): '''simplified example''' key = unique_key() tell_client_to_get_input(key) while key not in dictionary: pass return dictionary.pop(pin) Using a callback would be the normal way to go, but the input function must block until the result is available, so I can't see how that could work. The spec can't change, as Python will be using the new input function for stuff like help and pdb, which provide their own little REPLs. I have a lot of flexibility in terms of how everything works overall, but just can't budge on the function acting exactly like Python's. Is there any way to return the result as soon as it's available, without the busy loop?

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  • Should one use a separate database for application data and user data?

    - by trycatch
    I’ve been working on a project for a little while and I’m unsure which is the better architecture. I’m interested in the consensus. The answer to me seems fairly obvious but something about it is digging at me and I can't pick out what. The TL;DR is: how do you handle a program with application data and user data in the same DB which needs to be able to receive updates to the application data periodically? One database for user data and one for application, or both in one? The detailed version is.. if an application has a database which needs to maintain application data AND user data, and the user data all references application data, it feels more natural to me to store them in the same database. But if there exists a need to be able to update the application data within this database periodically, should this be stripped into two databases so that one can simply download the updated application data database file as an update and replace the old one? Or should they remain as one database, and the application data be updated via a script which inserts the new data into the existing database? The second sounds clearly preferable to me... but for some reason just doesn’t feel right, and I can't pick out quite why.

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  • JQuery Validation dates [migrated]

    - by james
    Im trying to get my form to validate...so basically its working, but a little bit too well, I have two text boxes, one is a start date, the other an end date in the format of mm/dd/yyyy if the start date is greater than the end date...there is an error if the end date is less than the start date...there is an error if the start date is less than today's date...there is an error The only thing is when I correct the error, the error warning is still there...here is my code: // Validate Date Ranges if ($(this).val() != '' && dates.not(this).val != '') { if ($(this).hasClass("FromCal")) { if (new Date(testDate) > new Date(otherDate)) { addError($(this)); $('.flightDateError').text('* Start date must be earlier than end date.'); isValid = false; return; } } else { if (new Date(testDate) < new Date(otherDate)) { addError($(this)); $('.flightDateError').text('* End date must be later than start date.'); return; } } } and here are the two text boxes: <div id="campaign_start" style="display: inline-block"> <label class="date_range_label">from:</label> <asp:TextBox ID="FromCalTbx" runat="server" Width="100px" CssClass="FromCal editable float_left required" /> </div> <div id="campaign_end" style="display: inline-block"> <label class="date_range_label">to:</label> <asp:TextBox ID="ToCalTbx" runat="server" Width="100px" CssClass="float_left optional"/> </div> PS - testDate is the start Date otherDate is the end Date

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  • Eliminating zero-length files

    - by RhZ
    I have been having multiple crashes recently. 4-5 last night within a few hours. I posted about it before, and got an answer but not sure how to proceed. The messages in my logs right before the crash are multiple complaints about valid eCryptfs headers. But the chron might not be related, I don't think I saw that in previous crashes: xxx-desktop kernel: [ 1112.274474] Valid eCryptfs headers not found in file header region or xattr region, inode 32376924 xxx-desktop CRON[4212]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) So I was sent to an answer providing this script: for i in find $(mount | grep " on $HOME type ecryptfs" | awk '{print $1}') -size 0c; do if ! fuser -v $i; then rm -f $i fi done I did find some zero byte files, not in the exactly right place (a folder called .private as I remember), but I need to fix this, its too bad right now. So I need to delete any of them that are not in use. I am a little too clueless, can someone walk me through executing this script? I don't know how.

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  • Why is Ubuntu unmounting my primary hard drive?

    - by Twisol
    I'm running Ubuntu 10.10 on my laptop (an Asus G73j), dual-booting Windows 7 if that matters. After using the computer for couple of hours or so, I get a popup complaining that a file was unmounted, then my GNOME desktop panels disappear. I can't save any unsaved work (the file browser shows "Filesystem" as totally empty), and other programs break in odd ways (like Chrome can't browse to any new pages, but keeps current ones going... at least I still have Pandora to listen to when this happens!). I've tried looking in the system logs to no avail; I'm assuming that it can't write any errors to the logs because, of course, the logs are on the primary hard drives. This started happening maybe a few days ago. Yesterday I upgraded from 10.4, but I believe it was happening before then. Any advice for figuring this out? EDIT: It just happened again, and I heard a small little clicky sound from the hard drive about five seconds before things went south. I'm thinking I should start backing up ASAP. In response to a comment, here's the dmesg output: http://askubuntu.pastebin.com/uYGshBay Also, the SMART status says the disk has a few bad sectors, and the detailed data says there are 14. It says it passed the self-assessment though. Lastly, this doesn't seem to be happening when I'm on Windows. I recently re-enabled ureadahead (which I disabled ages ago because it was causing Ubuntu to hang at the startup logo), could that be the source of the problem? I've disabled it again to see.

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  • What’s ‘default’ for?

    - by Strenium
    Sometimes there's a need to communicate explicitly that value variable is yet to be "initialized" or in other words - we’ve never changed it from its' default value. Perhaps "initialized" is not the right word since a value type will always have some sort of value (even a nullable one) but it's just that - how do we tell? Of course an 'int' would be 0, an 'enum' would the first defined value of a given enum and so on – we sure can make this kind of check "by hand" but eventually it would get a bit messy. There's a more elegant way with a use of little-known functionality of: 'default'Let’s just say we have a simple Enum: Simple Enum namespace xxx.Common.Domain{    public enum SimpleEnum    {        White = 1,         Black = 2,         Red = 3    }}   In case below we set the value of the enum to ‘White’ which happens to be a first and therefore default value for the enum. So the snippet below will set value of the ‘isDefault’ Boolean to ‘true’. 'True' Case SimpleEnum simpleEnum = SimpleEnum.White;bool isDefault; /* btw this one is 'false' by default */ isDefault = simpleEnum == default(SimpleEnum) ? true : false; /* default value 'white' */   Here we set the value to ‘Red’ and ‘default’ will tell us whether or not this the default value for this enum type. In this case: ‘false’. 'False' Case simpleEnum = SimpleEnum.Red; /* change from default */isDefault = simpleEnum == default(SimpleEnum) ? true : false; /* value is not default any longer */ Same 'default' functionality can also be applied to DateTimes, value types and other custom types as well. Sweet ‘n Short. Happy Coding!

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  • Mozilla Persona to the login rescue?

    - by Matt Watson
    A lot of website now allow us to login or create accounts via OAuth or OpenID. We can use our Facebook, Twitter, Google, Windows Live account and others. The problem with a lot of these is we have to have allow the websites to then have access to our account and profile data that they shouldn't really have. Below is a Twitter authorization screen for example when signing in via Technorati. Now Technorati can follow new people, update my profile and post tweets? All I wanted to do was login to Technorati.com to comment on a post!Mozilla has just released their new solution for this called Persona. First thought is oh great another solution! But they are actually providing something a little different and better. It is based on an email address and isn't linked to anything like our personal social networks or their information. Persona only exists to help with logging in to websites. No loose strings attached.Persona is based on a new standard called BrowserID and you can read more about it here:How BrowserID Works.  The goal is to integrate BrowserID in to the browser at a deeper level so no password entry is required at all. You can tell your web browser to just auto sign in for you. I am really hoping this takes off and will look at implementing it in current projects! I would recommend researching it and lets hope it or something like it becomes a wide spread reality in the future.

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  • Advantages of Scala vs. Groovy with JAVA EE 6 Applications.

    - by JAVA EE Wannabe
    Please let me first emphasize that I am not looking for flare wars. I just want advices from people who have real experiences. I started learning JAVA EE 6 as real newbie and am having had time choosing what tools to use. First problem is what is the advantage of using Scala vs. Groovy with Java EE 6 apps over Java? I've seen on some blogs people mentioning you gonna write less code but as a newbie I don't know what other advantages and disadvantages are there. Second problem is Netbeans 6.9 or Helios 3.6.1? I realized that with eclipse I can easily mix EE 6 applications with Groovy or Scala without any problems (I only did this by displaying a String message from Scala and Groovy classes.). With Netbeans the only I can think of is having separate Java project libraries and using the jars in my web app. But also realize to the extent of my little knowledge Netbeans has better support for Java EE 6. Please need your expert advice. Thanks.

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  • github team workflow - to fork or not?

    - by aporat
    We're a small team of web developers currently using subversion but soon we're making a switch to github. I'm looking at different types of github workflows, and we're not sure if the whole forking concept in github for each developer is such a good idea for us. If we use forks, I understand each developer will have his own private remote & local repositories. I'm worried it will make pushing changesets hard and too complex. Also, my biggest concern is that it will force each developer to have 2 remotes: origin (which is the remote fork) and an upstream (which is used to "sync" changes from the main repository). Not sure if it's such a easy way to do things. This is similar to the workflow explained here: https://github.com/usm-data-analysis/usm-data-analysis.github.com/wiki/Git-workflow If we don't use forks, we can probably get by fine by using a central repo creating a branch for each task we're working on, and merge them into the development branch on the same repository. It means we won't be able to restrict merging of branches and might be a little messy to have many branches on the central repository. Any suggestions from teams who tried both workflow?

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  • How can one-handed work in Ubuntu be eased?

    - by N.N.
    My right hand is temporarily immobilized and I would like to do some minor general work on my computer. Mostly web browsing, mailing and file and directory browsing and editing. For this I currently use Firefox, Thunderbird, Nautilus and the GNOME terminal (I have already asked a specific question about Emacs). Are there ways to ease such, or any other general, one-handed work in Ubuntu? I have found http://stackoverflow.com/questions/2391805/how-can-i-remain-productive-with-one-hand-completely-immobilized but that is not exactly what I am asking for. I want to ease whatever little time spent one-handed in Ubuntu and this is also interesting for situations where there is no injury involved, such as when one hand is occupied. I do realize I should avoid unnecessary strain. The main thing that is much slower one-handed is writing. Since I am only temporarily immobilized it seems to make no sense learn a new keyboard layout. I would be surprised if I managed to learn and become more effective with a new keyboard layout (than one-handed QWERTY) before I can use my other hand again. What I have already found: Sticky keys for making it easier to enter keyboard commands. When writing one-handed there are more cases of where it is useful to paste in phrases rather than to reenter them. It is easier to use Super+S rather than CtrlAlt+arrow keys to switch work space.

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  • Java and C# in web development [on hold]

    - by azalut
    I am wondering whether C# development(ASP.NET) is rather kind of "rapid development" or something "big" like JavaEE/Spring? We all know, that RoR or Django are really rapid-development frameworks - and so - is C# closer to Java "long-timed-development" or to frameworks like the two above - Django, RoR? I am, for now, an amateur Java programmer and sometimes I get annoyed with the amount of code that have to be written to create even a short CRUD app. We need a lot of skills to create at least a small app. I want some change, at least for some time and learn something new. I tried (just few hours) first: RoR, then Django and now I am writing in C#. It seems to be like Java but a little bit extended. In respect of future work as a professional coder - Is it profitable to know both competitive technologies like Java (and its frameworks) and C# with .NET(ASP.NET for example)? Maybe better choice is Python? Or just stop being stupid and still work with Java but with another framework(and master my Java skills) or JavaScript, jQuery to be better at web-development? Actually this question depends on your own opinions that is why I know that this question could be blocked by admins. But main question is in the top of the post I mean: is C# web-development rapid or closer to Java? I am afraid, that if I don't try, I will regret in the future, when I awake and think: oh my god, how could I not get familiar with (another_technology_or_language) Thanks for your attention :) ps I had asked the same question on stackoverflow, but it was hold because of being opinion based. Hope it fits here ;)

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  • Ubuntu 14.04: Fine tuning Touchpad for ThinkPad S431

    - by ramgorur
    I am using Ubuntu 14.04 on Lenovo ThinkPad S431. The touchpad is very bumpy, tricky to use. Slides down with a small touch, sometimes jerks erratically. I have tried to modify the settings in /usr/share/X11/xorg.conf.d/50-synaptics.conf file as below -- Section "InputClass" Identifier "touchpad catchall" Driver "synaptics" MatchIsTouchpad "on" MatchDevicePath "/dev/input/event*" Option "JumpyCursorThreshold" "250" Option "VertResolution" "100" # Option "HorizResolution" "65" # Option "MinSpeed" "1" # Option "MaxSpeed" "1" # Option "AccelerationProfile" "1" # Option "AdaptiveDeceleration" "8" # Option "ConstantDeceleration" "1" # Option "VelocityScale" "128" Option "HorizHysteresis" "150" Option "VertHysteresis" "150" EndSection There are lots of options here, does anyone know how to get a fine-tuned values for the above options (for ThinkPad S431)? The Hysteresis values seems to alleviate the problem a little bit, but failed to get a perfect result. EDIT: According to this bug report for ThinkPad X230 (+X230t), I set these values and quite good for now -- Option "VertResolution" "100" Option "HorizResolution" "65" Option "MinSpeed" "1" Option "MaxSpeed" "1" Option "AccelerationProfile" "2" Option "AdaptiveDeceleration" "16" Option "ConstantDeceleration" "16" Option "VelocityScale" "32" Option "HorizHysteresis" "50" Option "VertHysteresis" "50" and then you need to increase the cursor speed manually from the Unity mouse settings. But I am still looking for a fully functional (possibly with all the gestures) and a fine-tuned touchpad settings for S431. Further help is appreciated.

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  • How to define implementation details?

    - by woni
    In our project, an assembly combines logic for the IoC-Container, the project internals and the communication layer. The current version evolved to have only internal classes in addin assemblies. My main problem with this approach is, that the entry point is only available over the IoC-Container. It is not possible to use anything else than reflection to initialize the assembly. Everything behind the IoC-Interface is defined as implementation detail and therefore not intended for usages outside. It is well known that you should not test implementation detail (such as private and internal methods), because they should be tested through the public interface. It is also well known, that your tests should not use the IoC-Container to setup the SUTs, because that would result in too much dependencies. So we are using the InternalsVisibleTo-Attribute to make internals visible to our test assemblies and test the so called implementation details. I recognized that one problem could be the mixup between different concerns in that assembly, changing this would make this discussion useless, because classes have to be defined public. Ignoring my concerns with this, isn't the need to test a class enough reason to make it public, the usages of InternalsVisibleTo seems unintended, and a little bit "hacky". The approach to test only against the publicly available IoC-Container is too costly and would result in integration style tests. The pros of using internals are, that the usages are well known and do not have to be implemented like a public method would have to be (documentation, completeness, versioning,...). Is there a solution, to not test against internals, but keep their advantages over public classes, or do we have to redefine what an implementation detail is.

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  • Career advice on whether to stick with coding or move on to tech. lead\management [closed]

    - by flk
    I'm at a point in my career where I need to decide what to do next. I've mainly done C# desktop development (with a little python and Silverlight) for 5 or 6 years and I'm trying to decide whether to start learning JavaScript\HTML or to moving into a role where I do less coding and more tech. lead\management role. With all the talk around HTML5\JavaScript, the rise of mobile and the changes with Windows 8 (metro at least) I wonder if I should stick with coding to get some experience in these areas before moving on. But at the same time if I decide stick with coding for a ‘couple more years’ I will probably be faced with the same situation with some other new\interesting technology that I feel I should learn before moving on. I feel if I stick just with coding I'm limiting my career options but if I move to tech. lead\management I will loose my coding skills. Is going one direction or the other going to limiting my career options in the future? I know that there is no real answer to this question so I’m really just looking for some thoughts from others and perhaps experiences from other people that faced similar situations. Thanks

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  • 1360x768x32 Resolution in Windows 8 in VirtualBox

    - by mbcrump
    My Lenovo ThinkPad's built-in screen maxes at 1366x768x32. I wanted to use that same resolution with Windows 8 Developer Preview inside of VirtualBox. So, what did I do? Downloaded the latest build of VirtualBox v4.1.6 (because it supports Windows 8 x64) Installed Windows 8 Developer Preview in VirtualBox as I did earlier this year. Installed Guest Additions. Ran the CustomVideoMode described in this blog post. …and quickly found out that I didn’t have the option to use 1366x768x32 inside of VirtualBox despite using the following command: VBoxManage.exe setextradata  "[Virtual Machine Name]" CustomVideoMode1 1920x1080x32   So how do you fix it? If you do a little research on this resolution, then you will find it is a non-standard resolution. Even if you run the command: VBoxManage.exe setextradata "[Virtual Machine Name]" CustomVideoMode1 1366x768x32 It will still not show that resolution inside of VirtualBox. You can fix this easily by using the following command as shown below: VBoxManage.exe setextradata "[Virtual Machine Name]" CustomVideoMode1 1360x768x32 I hope that you noticed the command used the resolution of 1360 instead of 1366. Now if you go to your display option for Windows 8 inside of Virtualbox then you can select that resolution. Anyways, I hope this helps someone with a similar problem. I created this blog partially for myself but it is always nice to help my fellow developer.  Thanks for reading. Subscribe to my feed

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  • How to implement Restricted access to application features

    - by DroidUser
    I'm currently developing a web application, that provides some 'service' to the user. The user will have to select a 'plan' according to which she/he will be allowed to perform application specific actions but up to a limit defined by the plan. A Plan will also limit access to certain features, which will not be available at all for some plans. As an example : say there are 3 plans, 2 actions throughout the application users in plan-1 can perform action-1 3 times, and they can't perform action-2 at all users in plan-2 can perform action-1 10 times, action-2 5 times users in plan-3 can perform action-1 20 times, action-2 10 times So i'm looking for the best way to get this done, and my main concerns besides implementing it, are the following(in no particular order) maintainability/changeability : the number of plans, and type of features/actions will change in the final product industry standard/best practice : for future readiness!! efficiency : ofcourse, i want fast code!! I have never done anything like this before, so i have no clue about how do i go about implementing these functionalities. Any tips/guides/patterns/resources/examples? I did read a little about ACL, RBAC, are they the patterns that i need to follow? Really any sort of feedback will help.

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  • Web Hosting Checklist

    - by Chris
    I am a web developer that is starting to look into hosting his own website. I would like to showcase my programming skills (PHP, MySQl, C#, Wordpress). My knowledge of languages I am OK with but the actually hosting site is where my knowledge starts to get a little shaky. I know the basics (bandwidth, sub-domains, re-write rules) but I would love your input, to help me formulate a check list of certain web-hosting services that I should be on the look-out for. Also I was wondering if there were any reliable hosting providers who give you the option to host both c# code-behinds and PHP code. As I would like to have two versions of my site, one in C# and one in PHP the hope is that if I need to look for another job this website will help me show possible employers my server side knowledge. I hope this is enough info, I did some researching online but found a bunch of unless articles and I've always have had luck on the StackExchange sites. So hopefully you, can help me. Thanks alot.

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  • OpenXDK Questions

    - by iamcreasy
    I was strolling around XBox development. Apart form buying a DevKit from Microsoft, another thing got my attention is called, OpenXDK which stands for Open XBox Development Kit. From their main site its pretty obvious that there hasn't been any update since 2005 but digging a little deeper, I found that in their project repository is was being updated. Last time stamp was 2009-02-15. Quick google search said, its not actually really on a good place to poke around. Many and MANY features are absent. Being a hobby project I perfectly understand. But, those results are quite old. The question is, is there anybody who has any experience with OpenXDK? If is, that is it possible to shade some light on this? about its limitations? Is this a mature project? How's the latest version and what's it capable of doing? Or should I just stay away from it?

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  • OGRE 3D: How to create very basic gameworld [on hold]

    - by skiwi
    I'm considering trying around to create an FPS (First person shooter), using the Ogre 3D engine. I have done the Basic Tutorials (except CEGUI), and have read through the Intermediate Tutorial, I understand some of the more advanced concepts, but I'm stuck with very simple concepts. First of all: I would want to use some tiles (square ones, with relative little height) as the floor, I guess I need to set up a loop to get those tiles done. But how would I go about creating those tiles exactly? Like making it to be their own mesh, and then I would need to find some texture. Secondly: I guess I can derive the camera and movement functions from the basic tutorial. But I'll be needing a "soldier" (anything does for now), what is the best way to create a moderately decent looking soldier? (Or obtain a decent one from an open library?) And thirdly: How can I ensure that the soldier is actually walking on the ground, instead of mid air? Will raycasting into the ground + adjust position based on that, suffice?

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  • Differentiating between user script input formats

    - by KChaloux
    I have a .NET project at work that provides a couple of (Iron)Python scripts to the customers, to allow them to customize the output of the program. The application generates code for certain machines, and supports a couple of different formats. Until recently, we only provided a script for one format. We're expanding upon that to include support for the others. If the user is using a script, they select their input script before generating the output code. A script designed for Format1 output is going to cause errors if they're trying to generate Format2 output. I need to deal with this. One option would just be to let the customers use common sense, and if they load the wrong script it will just fail, or worse, produce inaccurate data. I'm inclined to provide a little more protection than that. At the moment I'm considering putting a shebang-style comment line at the top of the script, ala: # OUTPUT - Format1 If the user tries to run a Format2 process with a Format1 script, it will warn them. Alternatively I could create different file extensions for the input scripts that vary by type. The file-type comment approach helps prevent the script from actually loading improperly, at the cost of failing to warn the user until they've already selected it, via a dialog box. Using different file extensions would allow me to cut down on visual clutter when providing a File Dialog, but doesn't actually stop them from loading the wrong script. So I'm really not sure if the right approach is to just leave it alone, or provide some safeguards.

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  • Is The Ease Of Windows Phone Development Ruining Its Image

    - by Tim Murphy
    I was reading an article on Mashable recently by a long time iPhone user who is living solely on a Lumia 920 at the moment and giving her assessment.  One thing that struck a nerve with me was her describing the Windows Phone ecosystem as immature.  She wasn’t saying this because of the number of apps or the big names like most people do.  She means the quality of the apps in the store. This hit a nerve with me.  I find it hard to believe that the majority of app on iOS are of any higher quality than any other platform.  I believe in any ecosystem you are going to find some high end, high quality apps, but the majority by default will be from people who are trying to solve a problem but do not have the resources to have top graphics and full blown testing.  There will also be a large number that are just there trying to trick you into giving up some cash. Does any of the mean that we shouldn’t take notice of this complaint?  Of course not!  We should always strive to publish the best quality apps possible.  Don’t do things like leaving default app icons and backgrounds.  Put a little effort into your design.  You should also spend as much time as possible ensuring against crashes and giving the user the best experience possible.  Think through your apps organization and navigation.  Go the extra step of putting it into beta and letting select people use it and give you feedback before going to full release. Remember, if we want people to appreciate the Windows Phone platform we have to make sure we give them apps that they are going to enjoy using. del.icio.us Tags: Windows Phone,iPhone,iOS,Nokia,Lumia 920,Mashable

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  • Cheap ways to do scaling ops in shader?

    - by Nick Wiggill
    I've got an extensive world terrain that uses vec3 for the vertex position attribute. That's good, because the terrain has endless gradations due to the use of floating point. But I'm thinking about how to reduce the amount of data uploaded to the GPU. For my terrain, which uses discrete / grid-based vertex positions in x and z, it's pretty clear that I can replace my vec3s (floats, really) with shorts, halving the per-vertex position attribute cost from 12 bytes each to 6 bytes. Considering I've got little enough other vertex data, and an enormous amount of terrain data to push into the world, it's a major gain. Currently in my code, one unit in GLSL shaders is equal to 1m in the world. I like that scale. If I move over to using shorts, though, I won't be able to use the same scale, as I would then have a very blocky world where every step in height is an entire metre. So I see these potential solutions to scale the positional data correctly once it arrives at the vertex shader stage: Use 10:1 scaling, i.e. 1 short unit = 1 decimetre in CPU-side code. Do a division by 10 in the vertex shader to scale incoming decimetre values back to metres. Arbirary (non-PoT) divisions tend to be slow, however. Use (some-power-of-two):1 scaling (eg. 8:1), which enables the use of a bitshift (eg. val >> 3) to do the division... not sure how performant this is in shaders, though. Not as intuitive to read values, but possibly quite a bit faster than div by a non-PoT value. Use a texture as lookup table. I've heard that this is really fast. Or whatever solutions others can offer to achieve the same results -- minimal vertex data with sensible scaling.

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  • A tip: Updating Data in SharePoint 2010 using REST API

    - by Sahil Malik
    SharePoint 2010 Training: more information Here is a little tip that will save you hours of head scratching. See there are two ways to update data in SharePoint using REST based API. A PUT request is used to update an entire entity. If no values are specified for fields in the entity, the fields will be set to default values. A MERGE request is used to update only those field values that have changed. Any fields that are not specified by the operation will remain set to their current value.   Now, sit back and think about it. You are going to update the entire entity! Hmm. Which means, you need to a) specify every column value, and b) ensure that the read only values match what was supplied to you. What a pain in the donkey! So 99/100 times, a PUT request will give you a HTTP 500 internal server error occurred, which is just so helpful. Read full article ....

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  • Are scheduled job servers the right choice for a time sensitive game engine?

    - by maple_shaft
    I am currently architecting and designing an exciting new web application that will be entering into some areas that I have very little experience in, game development. The application is not necessarily a game, but there are some very time sensitive tasks and scheduled jobs that a server will need to run to perform game related activities (Eg. New match up starts at noon every day for a 12 day tournament, updating scoreboards at 5pm every day, etc...) In the past I have typically used cron jobs with the Quartz Scheduler running within a web application server, but I know that this isn't likely a scalable solution for the truly massive userbase that management is telling me to expect (Granted they are management and are probably highly optimistic about this) and also for how important the role of these tasks are in this web application. The other important thing I want to consider is that I want to avoid SPOF (Single Point Of Failure). If the primary job server goes down, another job server should be able to successfully run the job in its place. I suppose this can be done appropriately record locking and database transactions. My question is if scheduled jobs like CRON running on a web application server are a wise design choice given the time sensitive game tasks of this application, or is there something more appropriate for running a scalable game engine parallel to the web application servers?

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