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• How do professional games avoid showing pixel seams in adjacent mesh boundaries due to decimal imprecision?

  - by ufomorace

  Graphics cards are mathematically imprecise. So when some meshes are joined by their borders, the graphics card often makes mistakes and decides that some pixels at the seam represent neither object, and unwanted pixels appear. It's a natural behaviour on all graphics cards. How are such worries avoided in Pro Games? Batching? Shaders? Different tangent vectors? Merging? Overlaping seams? Dark backgrounds? Extra vertices at borders? Z precision? Camera distance tweaks? Screencap of a fix that ended up not working:

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• Track updated/inserted entities in LINQ to SQL applications

  - by nikolaosk

  In this post I would like to discuss in further detail the issue of track changing of entities in LINQ to SQL applications. I would like to show you how the DataContext object keeps track of all the items that are updated,deleted or inserted in the underlying data store. If you want to have a look at my other post about LINQ to SQL and transactions click here . I am going to demonstrate this with a hands on example. I assume that you have access to a version of SQL Server and Northwind database....(read more)

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• Any recommended books/resources on component-based design?

  - by user1163640

  I come from a background with heavy use of the classical object-oriented paradigm for software development. The company I am a part of switched to Unity not too long ago, and we're all very excited to get started using it However, one aspect that have sparked my interested, and which I think will become a very important part of our future development, is Unity's approach to component-based design with scripting; with less focus on typical hierarchical aspect. Question I was wondering if anyone could recommend any good books on this subject? I have had trouble finding any books or books with reliable reviews, and was wondering if anyone more experienced here had something to say on the issue? Any other kind of resource would be excellent too, I'm just interested in getting to learn everything I can about it. This is not meant as a discussion about best books or resources on the topic, but simply a question regarding any resources that any of you find useful. Thank you all for your time!

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• Entity Framework, Code First: where is the database?

  - by Marko Apfel

  With Entity Framework 5 in Visual Studio 2012 the code first feature could let you come to the question “Where is the automatically created database located?” I run in the question after changing the model which throws during the next run this error: “The model backing the 'MyContext' context has changed since the database was created. Consider using Code First Migrations to update the database (http://go.microsoft.com/fwlink/?LinkId=238269).” Okay – clear I thought “delete the database”. But where is the database and what type is it??? In this constellation the frameworks generates a localDB. You could access this database via SQL Server Object Explorer. For the first time you have to add this localDB. The server name is “(localdb)\v11.0”: And so we could browse through the content of this database. It got the same name like the context class.

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• Domain Model and Querying

  - by Tyrsius

  I am new to DDD, having worked only in Transaction-Script apps with an anemic model, or just Big Balls of Mud, so please forgive any terminology I abuse. I am trying to understand the proper separation between the domain model and the repository. What is the proper way to construct a domain object that is coming from a database, assuming the (incredibly simplified) need to query for objects by status (returns enumerable), or by ID. Should a factory be building the objects, exposing methods for GetByStatus() and GetByID(), using a DIed repository? Should a repository be called directly, knowing how to build a domain model from the DTO? Should the domain model have a constructor for get by ID, using a DIed repoistory to load the initial state, using some other (?) method for the list? I am not really sure what the best way would be, and this question has an answer advocating each one (these are certainly mutuallu exclusive).

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• Is it possible to create an "impossible" rooms in games?

  - by qwerty3000

  Forgive me my lack of knowlegde, but for quite a long time I asked myself whether it was possible to create a continous game space that some player could walk inside and so on, that would be absolutely impossible in reality, e.g. you have a very small house that allows you to go around it to see all sides and the full dimensions, and then, when you enter, it is like a giant hall, without any loading screen or (internal) "model change" and so on. I'm no game designer and I never needed to learn 3D-modelling, so I don't know what is possible and what isn't. And is this the same as Is the "impossible object" possible in computer graphics? this? Or is it just the same category, but not exactly the same question? Thanks.

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• How to upgrade to R 3.0.1 in Raring Ringtail?

  - by ACD

  I need to install the new version of R to get around the 2^31 object size limit. Its not clear how to do so. I see that there is a user-contributed PPA here. But I'm not sure exactly how to install it -- I would add the PPA, then do sudo apt-get install R-base? Do I need to manually remove the old version? How do I make sure that the new version of R plays well with Rgedit, which I use as an editor? I see many packages built for the PPA, but I don't see ALL of them, and in particular it is missing many that I use. Can I upgrade without creating problems along the lines of the worries described above? How do I do it?

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• VB 2010 LOGIN 3-TIMES LOOP [migrated]

  - by stargaze07

  How to put a loop on my log in code it's like the program will end if the user inputs a wrong password/username for the third time? At this point I'm having a hard time putting the loop code. This is my LogIn Code in VB 2010 Private Sub btnLogIn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogIn.Click Me.Refresh() Dim login = Me.TblUserTableAdapter1.UsernamePasswordString(txtUser.Text, txtPass.Text) If login Is Nothing Then MessageBox.Show("Incorrect login details", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error) Else Dim ok As DialogResult ok = MessageBox.Show("Login Successful", "Dantiña's Catering Maintenance System", MessageBoxButtons.OK, MessageBoxIcon.Information) MMenu.Show() MMenu.lblName.Text = "Welcome " & Me.txtUser.Text & " !" If txtPass.Text <> "admin" Then MMenu.Button1.Enabled = False ProdMaintenance.GroupBox1.Visible = True MMenu.Button2.Enabled = True MMenu.Button3.Enabled = True MMenu.Button4.Enabled = True Else MMenu.Button1.Enabled = True ProdMaintenance.GroupBox1.Visible = True MMenu.Button2.Enabled = True MMenu.Button3.Enabled = True MMenu.Button4.Enabled = True End If Me.Refresh() Me.Hide() End If End Sub

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• Unity LifeTimeManager for WCF

  I really love DI-frameworks. One reason is that it allows me to centralize life-time management of objects and services needed by others. Most frameworks have options to control the lifetime and allows objects to be created as Singletons, ThreadStatics, Transients (a new object everytime) etc. Im currently doing some work on a project where Unity [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How compilers know about other classes and their properties?

  - by OnResolve

  I'm writing my first programming language that is object orientated and so far so good with create a single 'class'. But, let's say I want to have to classes, say ClassA and ClassB. Provided these two have nothing to do with each other then all is good. However, say ClassA creates a ClassB--this poses 2 related questions: -How would the compiler know when compiling ClassA that ClassB even exists, and, if it does, how does it know it's properties? My thoughts thus far had been: instead of compiling each class at a time (i.e scan, parse and generate code) each "file (not really file, per se, but a "class") do I need to scan + parse each first, then generate code for all?

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• Targeting a vehicle with complex movement?

  - by e100

  Targeting a vehicle with known constant velocity is simple, and collision is guaranteed. Imprecise AI can be modeled by adding a small error factor. But how would one go about targeting a vehicle whose movements are more complex? Perhaps it's evading the AI or another game object. I've been thinking about how I'd do it myself in a FPS (in which bullets have finite speed) and think there might need to be at least couple of targeting modes based on the target's movement in the previous second or so: If it's near linear (peak acceleration in a certain range) target with the linear model If it's highly irregular (perhaps size of bounding box of recent positions could be used?) , target at an average For now I can assume 2d space, AI is stationary and projectile moves linearly.

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• Question between aggregations, compositions, references (arrow) and simple link (nothing) relations within UML2 ?

  - by Rushino

  Hello, I have some questions regarding relations between aggregations, compositions, references (arrow) and simple link (nothing) relations within UML2 ? If A - B - C each have composition relationship. Are the root responsable of creation and destruction of the object B and C ? What aggregations have that the simple link or references doesn't ? What make them different ? Thanks. Edit: The question was a bit unclear and not objective. I edited it.

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• Visual Basic 2010 Listbox Error [migrated]

  - by stargaze07

  what is the meaning of this error? sorry it's my first time to use Visual basic 2010, I'm not familiar with this kind of error, I use this for selecting all the files in the listbox and tried to move or copy to another listbox in other form. Error 1 'ToArray' is not a member of 'System.Windows.Forms.ListBox.ObjectCollection'. This is the code I use. Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If RadioButton1.Checked Then Dim itemsToMove = ListBox1.Items.ToArray() For Each item In itemsToMove Form2.lstP.Items.Add(item) ListBox1.Items.Remove(item) Next Form2.Show() End If End Sub Can someone help me with this?

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• Naming convention: field starting with "m" or "s"

  - by Noya

  Hope this question hasn't posted yet... I saw lot of code (for example some Android source code) where fields name start with a "m" while static fields start with "s" Example (taken from Android View class source): private SparseArray<Object> mKeyedTags; private static int sNextAccessibilityViewId; I was wondering what "m" and "s" stand for... maybe is "m" mutable and "s" static? Since it seems that is a largely adopted pattern do you know if there some literature about this kind of naming convention?

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• Multiple ( V- / I- ) Buffers, is it sane?

  - by Techie

  Currently I am developing an RTS game using XNA ( / ANX.Framework ). There is one thing bothers me. I am not sure in what way or how to organise Buffers. Should I use a new Vertexbuffer for any object ( e.g. a Char, a Table, an model ) or is it better to use ONE HUGE/ BIG Buffer to store any geometry in? I am still new to 3D Programming though I finished yet couple games using DirectX 9. Well, I hope this question qin't a duplicate and I appreciate any answer leading me into the right direction.

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• Android Java: Way to effectively pause system time while debugging?

  - by TheMaster42

  In my project, I call nanoTime and use that to get a deltaTime which I pass to my entities and animations. However, while debugging (for example, stepping through my code), the system time on my phone is happily chugging along, so it's impossible to look at, say, two sequential frames of data in the debugger (since by the time I'm done looking at the first frame, the system time has continued to move ahead by seconds or even minutes). Is there a programming practice or method to pause the system clock (or a way for my code to intercept and fake my deltaTime) whenever I pause execution from the debugger? Additional Information: I'm using Eclipse Classic with the ADT plugin and a Samsung SII, coding in Java. My code invoking nanoTime: http://pastebin.com/0ZciyBtN I do all display via a Canvas object (2D sprites and animations).

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• 3D Location Handling

  - by tgrosinger

  I am thinking about making a simulator type game that will involve having lots of small objects in a 3D space. What is the typical solution for handling these objects? The first thing that comes to mind is a 3D Array, but I can't help but think there is a more efficient solution. Another idea that comes to mind is objects having possession of smaller items. For example a House possesses a Table which possesses a Cup and Bowl. The final way I can think of handling this is just having an array of "objects" that each have an x, y, z value. While this would make storing them easy I do not understand how you would detect collisions without just looking at every possible object and checking to see if it is in the way. Are there other ways of holding onto these objects that is more efficient?

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• Dev Connections / VS Launch April 2010 &ndash; Code!

  Just returned from the VS Launch last week, and as promised here is the code for my sessions. I will post a separate entry with all the code for my Azure Tutorial which was on Thursday. And, as always, if you are looking for something in particular and cant find it here, just drop me an email! AppFabric Access Control http://www.dasblonde.net/downloads/AccessControlSamples.zip Samples for both WCF/REST samples and web resources such as Web Form and ASHX Samples include a complete object model...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Need suggestions on what you regard as &ldquo;security&rdquo;

  - by John Breakwell

  I’m currently writing a large piece on MSMQ security and wanted to check I was covering the right areas. I have some doubts as I’ve seen the occasional MSMQ forum question where a poster has used the word “security” in different contexts to what I was expecting. So here are the areas I plan to cover: Message security encryption on the wire (SSL and IPSEC) encryption of the message (MSMQ encryption) encryption of the payload (data encryption) signing and authentication Queue security SIDs and ACLs Discoverability Cross-forest issues Storage security NTFS permissions unencrypted data Service security Ports and Firewalls DOS attacks Hardened mode (HTTP only) RPC secure channel requirement authenticated RPC requirement Active Directory object permissions Setup Administrator requirements What else would you want to see?

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• Baby's first big CPP project - please help [closed]

  - by jamesson

  So, I need to do a few things to the code here; http://64.90.55.88/SynapseSource-Win.zip What I need to do 1)remove the opengl output window 2)Make it work with latest openni (http://75.98.78.94/default.aspx) - as far as I could tell it only works with a specific older version 3)Improve ram and cpu usage (assuming I don't get what I need from the first two changes) 4)Eventually rebuild it as an object in this sdk; http://cycling74.com/products/sdk/ I tried going through the documentation, but "the needle could not penetrate", alas. For example, I am still unclear about some basic things; a) what are the relative responsibilities of nite vs openni? b) which xml files are always used when the app launches, and what is their format? Many thanks in advance Joe Stavitsky

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• For nodejs what are best design practices for native modules which share dependencies?

  - by Mark Essel

  Hypothetical situation, I have 3 node modules all native, A, B, and C.  A is a utilities module which exposes several functions to javascript through the node interface, in addition it declares/defines a rich set of native structures and functions B is a module which is dependent on data structures and source in A, it exposes some functions to javascript, in addition it declares/defines native structures and functions C is a module which is dependent on data structures and source in A & B, it exploses some functions to javascript, in addition it declares/defines native structures and functions So far when setting up these modules I have a preinstall script to install other dependent includes, but in order to access all of another modules source what is the best way to link to it's share library object (*.node) ? Is there an alternative best practice for native modules (such as installing all source from other modules before building that single module)? Reply

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• SAP : « Notre Cloud doit être très solide et fonctionner quoiqu'il arrive », le point sur les offres hébergées de l'éditeur allemand

  SAP : « Notre Cloud doit marcher quoiqu'il arrive et être très solide » Le point sur les offres hébergées de l'éditeur allemand Depuis le rachat de Business Object, SAP ne cesse de le répéter : il n'est plus seulement un éditeur de solutions ERP. Il est multi-produit. Le rachat de Sybase a confirmé cette diversification en lui permettant de proposer des solutions de mobilité et même des outils de développement en rapport avec les terminaux nomades. Pour SAP, la diversification passe aussi par le SaaS (logiciel à la demande). Aujourd'hui, le Cloud est...

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• How does a linked library combined with the main executable program file interact with a kernel?

  - by I ask Questions For a Reason

  I was attempting to find an answer to this, and I did to some degree, but definitely not anywhere good enough to form a respectable, sensible and clear answer. If I am using Windows, Mac, Linux, or nearly any modern made OS for desktop IBM-compatible PCs, laptops, even tablets and smartphones, there's virtual memory. Clearly, compiling, at least on Windows I know this, an executable object file, such as a simple C "Hello World" output to a terminal, will be linked with the standard library, and several other Window's system software, dynamic linked libraries, and the like. However, how does linking all of these executables together or resources form a connectable interaction with, say, a device driver or any other stuff on the lower level?

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• Protecting the integrity of a game state while minimizing amount of data sent

  - by espais

  I'm developing a game in PHP/jQuery, and naturally have to be wary of any sort of data coming from the client. At present, I have tables of data representing the map (2D roguelike), monsters, items, and player(s). Initially, my thought was to simply package it all in a JSON object and send it every game tick, however when actually looking at the data I realized that's quite a large packet to be sending. So, my question is what is a good approach for minimizing data sent to the client? Obviously I would need to figure out some way of validating whatever it sends back. Initially we'd hoped to do some minimal verification on the client-side, but each time we thought of one thing we could do it is immediately invalidated with tools like Firebug. Kind of an open question I realize, but we want to get this right before we move on with our implementation so we don't have to shoehorn in bugfixes later on.

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• Returning status code where one of many errors could have occured

  - by yttriuszzerbus

  I'm developing a PHP login component which includes functions to manipulate the User object, such as $User->changePassword(string $old, string $new) What I need some advice with is how to return a status, as the function can either succeed (no further information needs to be given) or fail (and the calling code needs to know why, for example incorrect password, database problem etc.) I've come up with the following ideas: Unix-style: return 0 on success, another code on failure. This doesn't seem particularly common in PHP and the language's type-coercion messes with this (a function returning FALSE on success?) This seems to be the best I can think of. Throw an exception on error. PHP's exception support is limited, and this will make life harder for anybody trying to use the functions. Return an array, containing a boolean for "success" or not, and a string or an int for "failure status" if applicable. None of these seem particularly appealing, does anyone have any advice or better ideas?

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