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  • extrapolating object state based on updates

    - by user494461
    I have a networked multi-user collaborative application. To maintain a consistent virtual world, I send updates for objects from a master peer to a guest peer. The update state contains x,y,z coordinates of object center and his rotation matrix(CHAI3d api used a 3x3 matrix) with 30Hz frequency. I want to reduce this update rate and want to send with a reduced update rate. I want a predictor on both peers. When the predicted value is outside, say a error value of 10% in comparison to master peers objects original state the master peer triggers a state update. Now for position I used velocity,position updates so that the guest peer can extrapolate position. Like velocity for position what parameter should I use for rotation extrapolition?

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  • Web Based CRM For Banks.

    Banks have to make several transactions in a day; buyers have to give their email, phone numbers, address, names, social security number and credit card information. Huge amount of information is pro... [Author: James Wong - Computers and Internet - March 29, 2010]

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  • Improving WIF&rsquo;s Claims-based Authorization - Part 1

    - by Your DisplayName here!
    As mentioned in my last post, I made several additions to WIF’s built-in authorization infrastructure to make it more flexible and easy to use. The foundation for all this work is that you have to be able to directly call the registered ClaimsAuthorizationManager. The following snippet is the universal way to get to the WIF configuration that is currently in effect: public static ServiceConfiguration ServiceConfiguration {     get     {         if (OperationContext.Current == null)         {             // no WCF             return FederatedAuthentication.ServiceConfiguration;         }         // search message property         if (OperationContext.Current.IncomingMessageProperties. ContainsKey("ServiceConfiguration"))         {             var configuration = OperationContext.Current. IncomingMessageProperties["ServiceConfiguration"] as ServiceConfiguration;             if (configuration != null)             {                 return configuration;             }         }         // return configuration from configuration file         return new ServiceConfiguration();     } }   From here you can grab ServiceConfiguration.ClaimsAuthoriationManager which give you direct access to the CheckAccess method (and thus control over claim types and values). I then created the following wrapper methods: public static bool CheckAccess(string resource, string action) {     return CheckAccess(resource, action, Thread.CurrentPrincipal as IClaimsPrincipal); } public static bool CheckAccess(string resource, string action, IClaimsPrincipal principal) {     var context = new AuthorizationContext(principal, resource, action);     return AuthorizationManager.CheckAccess(context); } public static bool CheckAccess(Collection<Claim> actions, Collection<Claim> resources) {     return CheckAccess(new AuthorizationContext(         Thread.CurrentPrincipal.AsClaimsPrincipal(), resources, actions)); } public static bool CheckAccess(AuthorizationContext context) {     return AuthorizationManager.CheckAccess(context); } I also created the same set of methods but called DemandAccess. They internally use CheckAccess and will throw a SecurityException when false is returned. All the code is part of Thinktecture.IdentityModel on Codeplex – or via NuGet (Install-Package Thinktecture.IdentityModel).

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  • Design for a plugin based application

    - by Varun Naik
    I am working on application, details of which I cannot discuss here. We have core framework and the rest is designed as plug in. In the core framework we have a domain object. This domain object is updated by the plugins. I have defined an interface in which I have function as DomainObject doProcessing(DomainObject object) My intention here is I pass the domain object, the plug in will update it and return it. This updated object is then passed again to different plugin to be updated. I am not sure if this is a good approach. I don't like passing the DomainObject to plugin. Is there a better way I can achieve this? Should I just request data from plugin and update the domain object myself?

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  • How to stop a tap event from propagating in a XNA / Silverlight game

    - by Mech0z
    I have a game with Silverlight / XNA game where text and buttons are created in Silverlight while 3d is done in XNA. The Silverlight controls are drawn ontop of the 3D and I dont want a click on a button to interact with the 3D underneath So I have private void ButtonPlaceBrick_Tap(object sender, GestureEventArgs e) { e.Handled = true; But my gesture handling on the 3d objects still runs even though I have set handled to true. private void OnUpdate(object sender, GameTimerEventArgs e) { while (TouchPanel.IsGestureAvailable) { // Read the next gesture GestureSample gesture = TouchPanel.ReadGesture(); switch (gesture.GestureType) How am I supposed to stop it from propagating?

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  • Arrays for a heightmap tile-based map

    - by JPiolho
    I'm making a game that uses a map which have tiles, corners and borders. Here's a graphical representation: I've managed to store tiles and corners in memory but I'm having troubles to get borders structured. For the tiles, I have a [Map Width * Map Height] sized array. For corners I have [(Map Width + 1) * (Map Height + 1)] sized array. I've already made up the math needed to access corners from a tile, but I can't figure out how to store and access the borders from a single array. Tiles store the type (and other game logic variables) and via the array index I can get the X, Y. Via this tile position it is possible to get the array index of the corners (which store the Z index). The borders will store a game object and accessing corners from only border info would be also required. If someone even has a better way to store these for better memory and performance I would gladly accept that. EDIT: Using in C# and Javascript.

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  • VMware Data Recovery error -3960 and Event ID 8193 on Windows Server 2003

    - by flooooo
    I've been trying to solve this problem since a few days now without any success. What I'm trying is to make a backup of a virtual machine running Windows Server 2003 SP 2 using VMware Data Recovery 2.0.0.1861. When starting the backup task it tries to make a snapshot of the virtual machine using VSS which fails with error: Event Type: Error Event Source: VSS Event Category: None Event ID: 8193 Date: 05.06.2012 Time: 12:12:01 User: N/A Computer: LEGOLAS Description: Volume Shadow Copy Service error: Unexpected error calling routine RegSaveKeyExW. hr = 0x800703f8. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 2d 20 43 6f 64 65 3a 20 - Code: 0008: 57 52 54 52 45 47 52 43 WRTREGRC 0010: 30 30 30 30 30 33 39 36 00000396 0018: 2d 20 43 61 6c 6c 3a 20 - Call: 0020: 57 52 54 52 45 47 52 43 WRTREGRC 0028: 30 30 30 30 30 33 31 38 00000318 0030: 2d 20 50 49 44 3a 20 20 - PID: 0038: 30 30 30 30 36 34 38 38 00006488 0040: 2d 20 54 49 44 3a 20 20 - TID: 0048: 30 30 30 30 34 33 38 34 00004384 0050: 2d 20 43 4d 44 3a 20 20 - CMD: 0058: 43 3a 5c 57 49 4e 44 4f C:\WINDO 0060: 57 53 5c 53 79 73 74 65 WS\Syste 0068: 6d 33 32 5c 76 73 73 76 m32\vssv 0070: 63 2e 65 78 65 20 20 20 c.exe 0078: 2d 20 55 73 65 72 3a 20 - User: 0080: 4e 54 20 41 55 54 48 4f NT AUTHO 0088: 52 49 54 59 5c 53 59 53 RITY\SYS 0090: 54 45 4d 20 20 20 20 20 TEM 0098: 2d 20 53 69 64 3a 20 20 - Sid: 00a0: 53 2d 31 2d 35 2d 31 38 S-1-5-18 This machine was converted p2v. I have no idea where to search for the problem and what to do. Google showed a few result but none of them were useful for me. Please help me. If you need further information I'll tell you - just ask!

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  • Gracefully terminate a request based service on server

    - by Jatin
    In our web application, for each http-request there is a lot of computation that happens on back end. Output can vary from 10 sec - 1 Hour. In the mean time when it is computed, "Waiting.." is shown on the website for the respective user. But it so happens, that a user might cut down the service in between. So what all can be done on the back end so that the computation can be stopped in between to save resources? What different tactics can be applied here? And if better (instead of killing the thread directly), then a graceful termination policy should make wonders.

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  • WoW lua: Getting quest attributes before the QUEST_DETAIL event

    - by Matt DiTrolio
    I'd like to determine the attributes of a quest (i.e., information provided by functions such as QuestIsDaily and IsQuestCompletable) before the player clicks on the quest detail. I'm trying to write an add-on that handles accepting and completing of daily quests with a single click on the NPC, but I'm running into a problem whereby I can't find out anything about a given quest unless the quest text is currently being displayed, defeating the purpose of the add-on. Other add-ons of this nature seem to be getting around this limitation by hard-coding information about quests, an approach I don't much like as it requires constant maintenance. It seems to me that this information must be available somehow, as the game itself can properly figure out which icon to display over the head of the NPC without player interaction. The only question is, are add-on authors allowed access to this information? If so, how? EDIT: What I originally left out was that the situations I'm trying to address are when: An NPC has multiple quests The quest detail is not the first thing that shows up upon right-click Otherwise, the situation is much simpler, as I have the information I need provided immediately.

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  • Designing a Content-Based ETL Process with .NET and SFDC

    - by Patrick
    As my firm makes the transition to using SFDC as our main operational system, we've spun together a couple of SFDC portals where we can post customer-specific documents to be viewed at will. As such, we've had the need for pseudo-ETL applications to be implemented that are able to extract metadata from the documents our analysts generate internally (most are industry-standard PDFs, XML, or MS Office formats) and place in networked "queue" folders. From there, our applications scoop of the queued documents and upload them to the appropriate SFDC CRM Content Library along with some select pieces of metadata. I've mostly used DbAmp to broker communication with SFDC (DbAmp is a Linked Server provider that allows you to use SQL conventions to interact with your SFDC Org data). I've been able to create [console] applications in C# that work pretty well, and they're usually structured something like this: static void Main() { // Load parameters from app.config. // Get documents from queue. var files = someInterface.GetFiles(someFilterOrRegexPattern); foreach (var file in files) { // Extract metadata from the file. // Validate some attributes of the file; add any validation errors to an in-memory // structure (e.g. List<ValidationErrors>). if (isValid) { var fileData = File.ReadAllBytes(file); // Upload using some wrapper for an ORM or DAL someInterface.Upload(fileData, meta.Param1, meta.Param2, ...); } else { // Bounce the file } } // Report any validation errors (via message bus or SMTP or some such). } And that's pretty much it. Most of the time I wrap all these operations in a "Worker" class that takes the needed interfaces as constructor parameters. This approach has worked reasonably well, but I just get this feeling in my gut that there's something awful about it and would love some feedback. Is writing an ETL process as a C# Console app a bad idea? I'm also wondering if there are some design patterns that would be useful in this scenario that I'm clearly overlooking. Thanks in advance!

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  • Which unit test framework for c++ based games?

    - by jmp97
    Which combination of testing tools do you feel is best? Given the framework / library of your choice you might consider: suitability for TDD ease of use / productivity dealing with mock objects setup with continuous integration error reporting Note: While this is potentially a generic question like the one on SO I would argue that game development is usually bound to a specific work flow which influences the choice for testing. For a higher-level perspective, see question Automated testing of games.

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  • Grid-Based 2D Lighting Problems

    - by Lemoncreme
    I am aware this question has been asked before, but unfortunately I am new to the language, so the complicated explanations I've found do not help me in the least. I need a lighting engine for my game, and I've tried some procedural lighting systems. This method works the best: if (light[xx - 1, yy] > light[xx, yy]) light[xx, yy] = light[xx - 1, yy] - lightPass; if (light[xx, yy - 1] > light[xx, yy]) light[xx, yy] = light[xx, yy - 1] - lightPass; if (light[xx + 1, yy] > light[xx, yy]) light[xx, yy] = light[xx + 1, yy] - lightPass; if (light[xx, yy + 1] > light[xx, yy]) light[xx, yy] = light[xx, yy + 1] - lightPass; (Subtracts adjacent values by 'lightPass' variable if they are more bright) (It's in a for() loop) This is all fine and dandy except for a an obvious reason: The system favors whatever comes first in the for() loop This is what the above code looks like applied to my game: If I could get some help on creating a new procedural or otherwise lighting system I would really appreciate it!

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  • Redirecting a CSS file based on .htaccess rules.

    - by Anthony Hiscox
    I'm trying to hack the css files on OSTicket by replacing them with my own custom ones when a specific URL is accessed. The URL that is accessed for this example is http://osticket.cts/helpdesk/scp/css/main.css and I would like it to use the css file at http://osticket.cts/test.css why won't this .htaccess file (in web root, not /helpdesk/scp/) work? Is there an easy way to debug these rules, some way to find out what apache did when the URL was accessed and where it's failing? error.log doesn't show anything useful. RewriteEngine On RewriteCond %{HTTP_HOST} ^osticket\.cts$ [NC] RewriteRule ^(.*)main\.css$ /test.css [NC, L]

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  • GameState management hierarchical FSM vs stack based FSM

    - by user8363
    I'm reading a bit on Finite State Machines to handle game states (or screens). I would like to build a rather decent FSM that can handle multiple screens. e.g. while the game is running I want to be able to pop-up an ingame menu and when that happens the main screen must stop updating (the game is paused) but must still be visible in the background. However when I open an inventory pop-up the main screen must be visible and continue updating etc. I'm a bit confused about the difference in implementation and functionality between hierarchical FSM's and FSM's that handle a stack of states instead. Are they basically the same? Or are there important differences?

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  • Best ways to collect location-based user input

    - by user359650
    I'm working on a website where users will be able to register and provide information about their location. In order to prevent users from inputting incorrect data, we don't want users to provide free-text information but instead choose from predefined values as much as possible. We believe there are 2 ways of providing those values: use an API to an external service provider or create your own local database. APIs Some resources: - https://developers.facebook.com/docs/reference/ads-api/get-autocomplete-data/ - http://developer.yahoo.com/geo/geoplanet/ Pros: -accuracy and completeness of data. -no maintenance related to update of data as this it taken care of by API provider. -easier/faster to get started (no need to create local database, just implement API). Cons: -degradation of performance when availability issues with external API. -outage due to changes to the external API (until your code is updated to reflect those changes). -lock-in with external provider. Local database Some resources: - http://developer.yahoo.com/geo/geoplanet/data/ - http://www.maxmind.com/app/geolitecity - http://download.geonames.org/export/dump/ Pros: -no external dependency: improved stability and performance. Cons: -more work to get started (you need to create the database and code to interact with it). -risks of inaccurate/incomplete data, either initially or over time. -more maintenance work to keep database up to date. Assuming the depth information requested from users is as follows: -country: interested in value. also used to narrow down list of regions. -region (state in the US, county in the UK...): not interested in value itself, only used to narrow down list of cities. -city: interested in value (which can be used to work out related region should we need regional statistics). -address: interested in value although OPTIONAL. Which option (whether API or local database) would you choose? What tips you would give for the implementation? What other resources can you share?

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  • SQL – Crossword Puzzle Based on Course Building Successful High Traffic Profitable Blog

    - by Pinal Dave
    Do you like Crossword Puzzles? I personally love it. Everytime I open the newspaper, I try to resolve at least one crossword or sudoku. It is just fun to tease a brain little and stretch its limits. Regular readers of the blogs are aware that I have recently published two courses on how to build successful high traffic profitable blog. Here are the links to watch both the courses: Course 1, Course 2. Do watch them in order as both the courses have unique content, which can help you build a better blog. On my birthday July 30th, there was an interesting blog post posted on Pluralsight blog. It was a crossword build from my two courses. I encourage you try to solve the crossword which I have built. Giveaway: There is a cool gift for the winner – it is melting clock. Do not confuse this as a dummy or not working clock. This looks like melting but it always shows accurate time and it is perfectly balanced to hang off of any flat surface. How to Participate: Well, it is very simple, you just have to complete the crossword and send it to me at pinal at sqlauthority.com with all valid answers. The deadline is that you must send it before Monday August 5, 2013 or before the valid answer keys are posted on Pluralsight blog. Hints: Though the crossword is very easy and intuitive, if you ever get stuck anywhere here are two hints: Hint 1, Hint 2. Login to Pluralsight courses and watch both the courses. Watching the course will not only help you to easily complete crossword but there are hidden gems and secrets to build a high traffic profitable blog. Here is the link to download the crossword: Download Crossword. Alternatively you can download the image displayed below and print it as well.   Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: About Me, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: Blogging

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  • Technique to have screen independent grid based puzzle with sprite animation

    - by Yan Cheng CHEOK
    Hello all, let's say I have a fixed size grid puzzle game (8 x 10). I will be using sprites animation, when the "pieces" in the puzzle is moving from one grid to another grid. I was wondering, what is the technique to have this game being implemented as screen resolution independent. Here is what I plan to do. 1) The data structure coordinate will be represented using double, with 1.0 as max value. // Puzzle grid of 8 x 10 Environment { double width = 0.8; double height = 1.0; } // Location of Sprite at coordinate (1, 1) Sprite { double posX = 0.1; double posY = 0.1; double width = 0.1; double height = 0.1; } // scale = PYSICAL_SCREEN_SIZE drawBitmap ( sprite_image, sprite_image_rect, new Rect(sprite.posX * Scale, sprite.posY * Scale, (sprite.posX + sprite.width) * Scale, (sprite.posY + sprite.Height) * Scale), paint ); 2) A large size sprite image will be used (128x128). As sprite image shall look fine if we scale from large size down to small size, but not vice versa. Besides the above mentioned technique, is there any other consideration I had missed out?

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  • The previous system shutdown at xxxx was unexpected

    - by m.edmondson
    For the past two nights we had a remote server shutdown unexpectedly. When rebooted we get the following message: Event Type: Error Event Source: EventLog Event Category: None Event ID: 6008 Date: 16/02/2011 Time: 09:10:43 User: N/A Computer: WELPLAN-1 Description: The previous system shutdown at 07:27:32 on 16/02/2011 was unexpected. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: db 07 02 00 03 00 10 00 Û....... 0008: 07 00 1b 00 20 00 42 02 .... .B. 0010: db 07 02 00 03 00 10 00 Û....... 0018: 07 00 1b 00 20 00 42 02 .... .B. Obviously this message doesn't help much, but what does all the hexadecimal mean? Will it help me track down the problem? Any pointers as to where to look?

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  • Turn-based tile game dynamic item/skill/command script files

    - by user1542
    I want to create a mechanism that could read text script, for example some kind of custom script such as ".skill" or ".item", which maybe contain some sort of simple script like .item Item.Name = "Strength Gauntlet"; Character.STR += 20; .. .skill Skill.Name = "Poison Attack"; Skill.Description = "Steal HP and inflict poison"; Player.HP += 200; Enemy.HP -= 200; Enemy.Status += Status.POISON; It may be different from this, but just want to give some idea of what I desire. However, I do not know how to dynamically parse these things and translate it into working script. For example, in battle scenerio, I should make my game read one of this ".skill" file and apply it to the current enemy, or the current player. How would I do this? Should I go for String parsing? It is like a script engine, but I prefer C# than creating new language, so how would I parse custom files into appropiate status commands? Another problem is, I have also created a command engine which would read String input and parse it into action such as "MOVE (1,2)" would move character to tile (1,2). Each command belong to separate class, and provide generic parsing method that should be implemented by hand. This is for the reason of custom number/type of arguments per each command. However, I think this is not well designed, because I desire it to automatically parse the parameters according to specify list of types. For example, MOVE command in "MOVE 1 2" would automatically parse the parameters into int, int and put it into X and Y. Now, this form can change, and we should be able to manually specify all type of formats. Any suggestion to this problem? Should I change from string parsing to some hardcode methods/classes?

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