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• Oracle at Information Security and Risk Management Conference (ISACA Conferences)

  - by Tanu Sood

  The North America Information Security and Risk Management (ISRM) Conference hosted by ISACA will be held this year from November 14 - 16 in Las Vegas, Nevada and Oracle is a platinum sponsor. The ISRM / IT GRC event is not only designed to meet the exact needs of information security, governance, compliance and risk management professionals like you, but also gives you the tools you need to solve the issues you currently face. The event builds on and includes the key elements of information security, governance, compliance and risk management practices, and offers a fresh perspective on current and future trends. As a Platinum Sponsor Oracle will not only have an opportunity to demonstrate but talk through our strategic roadmap and support to ensure all organizations understand our key role within the industry to ensure corporate data and information remains safe. Join us at the Lunch and Learn to learn more about the latest advances in Oracle Identity Management. Lunch and Learn Session: Trends in Identity Management Speaker: Mike Neuenschwander, Senior Product Development Director, Oracle Identity Management As enterprises embrace mobile and social applications, security and audit have moved into the foreground. The way we work and connect with our customers is changing dramatically and this means, re-thinking how we secure the interaction and enable the experience. Work is an activity not a place - mobile access enables employees to work from any device anywhere and anytime. Organizations are utilizing "flash teams" - instead of a dedicated group to solve problems, organizations utilize more cross-functional teams. Work is now social - email collaboration will be replaced by dynamic social media style interaction. In this session, we will examine these three secular trends and discuss how organizations can secure the work experience and adapt audit controls to address the "new work order". We also recommend you bookmark the following session: T1 Session 301: Gone in 60 Seconds: Mitigating Database Security Risk Friday, November 16, 8:30 am – 9:30 am And, do be sure to stop by our booth, # 100 & #102, to not only network with our Product Development Team, but also get an onsite demonstration of Oracle Security Solutions. See you there? ISRM /  IT GRC November 14 – 16, 2012 Mirage Casino-Hotel 3400 Las Vegas Boulevard South Las Vegas, NV, 89109

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• how to link a c++ object to a local variable in Lua

  - by MahanGM

  I'm completing my scripting interface with Lua, but recently I've stuck at some point. I have several functions for my Entitiy events like Update(). I have a function called create_entitiy() which instantiate a new entity from a given entity index: function Update() local bullet = create_entity(0, 0, "obj_bullet") end create_entity returns a table which is the properties of the created entity. Now how can I make a connection between bullet variable and my newly created object? Right now for previously added objects to the scene, I simply set a global table for each of them and then after every call to Update(), I go through registered names to find object tables and perform new changes. Like the one below: function Update() if keyboard_key_press(vk_right) then obj_player.x += 3 end I can get obj_player table because I know its name from C++, plus I can get it as a global table and simply reach for the first instance named obj_player. Is there any solution for me to make bullet variable act like this? I was thinking to get all local variables in Update() function and check for every one to see if is it table and it has an unique field attached to it like id, this way I can determine that this is an object table and do the rest of the process. By the way, is this interface going to work easier with luaBind if I implement it? Bottom line: How can I make a local variable in Lua that receives a table from create_entity function and track that local variable to capture it from C++. e. g. function Update() local bullet = create_entity(0, 0, "obj_bullet") bullet.x = 10 <== Commit a change in table end Now I want to get variable bullet from C++. And it's not just this variable, there might be a ton of these local variables with different names.

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• Configuring Transmission for faster download

  - by Luis Alvarado

  I have tested on the same PC with the same torrent/magnet links the following Torrent Clients: Transmission Ktorrent Deluge qBittorrent Vuze After 7 days of testing I noticed that the only one that took longer to start downloading and to keep an optimum/max download speed was Transmission. It was the slowest of them all to download the same torrents or magnet links which I tested 8 torrents and 4 magnet links from different sites and the one that took the most to start downloading or start after a pause/resume event. The other 4 just took less than 2 seconds for example to start downloading and to download the same content between 50% less time to 80% less time. I think that Transmission has the same capabilities about downloading/resuming than the other torrent clients but it may be because of some configuration I need to do to get the same speed and effect than the others. In my tests all torrent clients were tested with their default configurations. No changes were made. They were tested on the same PC, with the same network connection in the same time periods. So I am thinking that Transmission just needs a little bit of configuration tunning. I also set the ports for use to the same one for each. Checked the router for any blocking and anything related to the network. What options can I change to make it so Transmission resumes a download faster (grabs the seeds faster) and keeps a fast download all the time (Stays with the seeds that offer the best connection for example). Both of which by the look of it are features that the rest of the torrent clients do already.

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• How to handle wildly varying rendering hardware / getting baseline

  - by edA-qa mort-ora-y

  I've recently started with mobile programming (cross-platform, also with desktop) and am encountering wildly differing hardware performance, in particular with OpenGL and the GPU. I know I'll basically have to adjust my rendering code but I'm uncertain of how to detect performance and what reasonable default settings are. I notice that certain shader functions are basically free in a desktop implemenation but can be unusable in a mobile device. The problem is I have no way of knowing what features will cause what performance issues on all the devices. So my first issue is that even if I allow configuring options I'm uncertain of which options I have to make configurable. I'm wondering also wheher one just writes one very configurable pipeline, or whether I should have 2 distinct options (high/low). I'm also unsure of where to set the default. If I set to the poorest performer the graphics will be so minimal that any user with a modern device would dismiss the game. If I set them even at some moderate point, the low end devices will basically become a slide-show. I was thinking perhaps that I just run some benchmarks when the user first installs and randomly guess what works, but I've not see a game do this before.

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• Building apps that work Together

  - by Tim Murphy

  Originally posted on: http://geekswithblogs.net/tmurphy/archive/2013/07/03/building-apps-that-work-together.aspx  Writing apps that stand alone will only get yon so far.  If your app can allow the user to leverage other applications and share data you Can have a real winner on your hands. Jake Sabulsky started off by explaining that you should be concentrating on the core functionality of your app and letting the framework take care of the features that users require these days.  This is implemented be leveraging contracts.  When Windows 8 was released it included the File, Share and Pickers contracts.  With the release of Windows 8.1 they have added the Contacts and Calendar contracts. There have been a number of improvements to the original contracts. The File URI contract will now automatically detect the size that a new windows should be opened and will also allow you to programmatically influence new window size.  The Share contract has been enhanced by allowing apps to always share screenshots and links to the app in the store. To my thinking the contracts are one of the most powerful features of Windows 8.  Take the time view this session and learn how to leverage them. Technorati Tags: BUILD 2013,Windows 8,Live tiles

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• How do "custom software companies" deal with technical debt?

  - by andy

  What are "custom software companies"? By "custom software companies" I mean companies that make their money primarily from building custom, one off, bits of software. Example are agencies or middle-ware companies, or contractors/consultants like Redify. What's the opposite of "custom software companies"? The oposite of the above business model are companies that focus on long term products, whether they be deployable desktop/mobile apps, or SaaS software. A sure fire way to build up technical debt: I work for a company that attempts to focus on a suite of SaaS products. However, due to certain constraints we sometimes end up bending to the will of certain clients and we end building bits of custom software that can only be used for that client. This is a sure fire way to incur technical debt. Now we have a bit of software to maintain that adds nothing to our core product. If custom work is a sure fire way to build technical debt, how do agencies handle it? So that got me thinking. Companies who don't have a core product as the center of their business model, well they're always doing custom software work. How do they cope with the notion of technical debt? How does it not drive them into technical bankruptcy?

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• from Java to SAS

  - by Giovanni Rossi

  I am a seasoned python,java,...other programmer having a (fairly advanced) mathematical education (so I do understand statistics and data mining, for example) . For various reasons I am thinking to switch to SAS/BI area (I am naming SAS because it might be, for me, a possible way to enter in BI). My question, for whoever might have an experience of both: is it, in BI current state, worth it? I mean, the days of big ideas in BI for business seem to be over (there are the APIs, managers think that they know what you can do with them), and my mathematical background might turn out to be superflous. Also, the big companies now have their data organized, have their BI procedures well established, and trying to analyze it from a different standpoint might not be what they want. Another difference is: while in Java etc. development one codes and codes and codes, I don't know if this is the case for BI; in fact, from what I read on the net, a BI (or OLAP, ...etc) developer, in a big organization, is usually in a state of standby, and does in fact little coding. Any opinions, and in particular strong opinions, will be appreciated.

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• Game Trees Conceptual Question

  - by Chris Corbin

  I am struggling to conceptually understand a question in a programming assignment for an algorithms class. The problem is dealing with a fictitious 2 player game, named Easy. The rules of the game are simple; each player may chose one of 4 integers {0-3} after which that integer is not available for the other player. The catch is, a player picks {0} it means they quit. The objective is for Player 1 to get {1} and Player 2 to get {2}, in which case they may win, however if both or neither succeed, then the game ends in a draw. I have been asked to draw the game tree for Easy, showing all nodes, which they explained as 4! = 24. Labeling the edges, which represent moves (selecting a number) and the leaves with who won (1 means Player 1 won, -1 means Player 2 won, and 0 means a tie). I have drawn out a game tree, which I believe is correct, however I am not 100% certain hence I am asking the question. My game tree only has 16 leaves. I am thinking that when a player picks {0}, and then quits, the game tree stops there? I don't see how it is possible to get to 24 leaves? Any help would be greatly appreciate, and if you need more information I would be happy to provide it. Thanks

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• What is the proper SEO handling of pages appearing in popups using IFRAMEs?

  - by Alexis Wilke

  I am working on a CMS which makes use of IFRAMEs to display some forms, for illustration, say a Search form. So the user clicks the Search button and the website reacts by opening a popup window which includes an IFRAME to the actual Search form. This means I have a "bare"¹ page with the search form. Page which, obviously, is directly accessible via its own URI. In terms of SEO, the forms have no content worthy of being indexed, so I was thinking to mark them as NOINDEX. Is that the correct way to handle such pages? From what I read on some other question, Google suggests to put links from IFRAMEs to other pages. However, I definitively do not want a user visible link to the Home page, or whatever page in link with the form, in the content of my forms because that could be misinterpreted by the user. However, if <link> tags would work too, which one should I use? (i.e. "top" would work, right? with the home page in there?) ¹ By bare I mean that the normal theme is not show, it will be a plain white background with just and only the simplest form.

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• What functionality of an iPad can I use with Ubuntu?

  - by Andrew Ferrier

  What functionality of an iPad can I use with Ubuntu? I'm thinking about buying an iPad, but I only have Ubuntu PCs these days (no Windows, no Mac), and I'm nervous that it may be too reliant on the existence of iTunes. I'm less concerned about getting media onto and off it (and I have read that I can do this with libimobiledevice), but will I be able to activate it with iTunes? Does it need to be USB synced on a regular basis, or can I do most anything I want through the cloud (i.e. over wifi)? Edit: In answer to jrgifford's question, in theory, I'd like to do everything I would want to do with it were I using Windows/Mac. But more specifically, I think I'd want to: "Activate" it, if that's necessary Copy music / video onto it Install apps How much of this can I do without a Windows/Mac PC? Is it necessary to activate it? I don't think I'm that interested in backing it up (what would I back up?), but then again, maybe I'm confused as to how easy it is to get data on and off. Can I get a regular SFTP app for the iPad to copy data to my Ubuntu machine over wi-fi, for example?

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• What benefits can I get upgrading my ASP.NET (Webform) + DAL(EF) + Repository + BLL structure to MVC?

  - by Etienne

  I'm in the process of defining an approach that may best fit our needs for a big web application development. For now, I'm thinking going with an ASP.NET Architecture with a DAL using Entity Framework, a Repository concept to not access DAL directly from BLL and a BLL that call the repository and make every manipulations necessary to prepare data to push in a presentation layer (.aspx files). I don't plan to use ASP.Net controls and prefer to keep things simple and lightweight using plain html, jQuery UI controls and do most of the server calls with jQuery Ajax. Sometimes, when needed, I plan to use handlers (.ashx) to call BLL methods that will return JSON or HTML to client for dynamic stuff. My solution also has a test project that Mock the Repository with in-memory data to not repose on database for testing BLL methods... It may be usefull to add that we will build a big application over this architecture with hundreds of tables and store procedures with a lot of reading and writing to database. My question is, having this architecture in mind, Is there any evident advantages that I can obtain by using an MVC3 project instead of the described architecture base on Webform? Do you see any problem in this architecture that may cause us problem during the next steps of development? I know the MVC pattern for using it in others projects with Django... but the Microsoft MVC implementation look so much more complex and verbose than Django MVC and it's why I'm hesitating (or waiting for a little push?) right now before jumping into it... We are in a real project with deadlines and don't want to slow the development process without any real benefits.

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• Should I pick up a functional programming language?

  - by Statement

  I have recently been more concerned about the way I write my code. After reading a few books on design patterns (and overzealous implementation of them, I'm sure) I have shifted my thinking greatly toward encapsulating that which change. I tend to notice that I write less interfaces and more method-oriented code, where I love to spruce life into old classes with predicates, actions and other delegate tasks. I tend to think that it's often the actions that change, so I encapsulate those. I even often, although not always, break down interfaces to a single method, and then I prefer to use a delegate for the task instead of forcing client code to create a new class. So I guess it then hit me. Should I be doing functional programming instead? Edit: I may have a misconception about functional programming. Currently my language of choice is C#, and I come from a C++ background. I work as a game developer but I am currently unemployed. I have a great passion for architecture. My virtues are clean, flexible, reusable and maintainable code. I don't know if I have been poisoned by these ways or if it is for the better. Am I having a refactoring fever or should I move on? I understand this might be a question about "use the right tool for the job", but I'd like to hear your thoughts. Should I pick up a functional language? One of my fear factors is to leave the comfort of Visual Studio.

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• Distributed transactions and queues, ruby, erlang

  - by chrispanda

  I have a problem that involves several machines, message queues, and transactions. So for example a user clicks on a web page, the click sends a message to another machine which adds a payment to the user's account. There may be many thousands of clicks per second. All aspects of the transaction should be fault tolerant. I've never had to deal with anything like this before, but a bit of reading suggests this is a well known problem. So to my questions. Am I correct in assuming that secure way of doing this is with a two phase commit, but the protocol is blocking and so I won't get the required performance? It appears that DBs like redis and message queuing system like Rescue, RabbitMQ etc don't really help me a lot - even if I implement some sort of two phase commit, the data will be lost if redis crashes because it is essentially memory-only. All of this has led me to look at erlang - but before I wade in and start learning a new language, I would really like to understand better if this is worth the effort. Specifically, am I right in thinking that because of its parallel processing capabilities, erlang is a better choice for implementing a blocking protocol like two phase commit, or am I confused?

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• What are some good examples of exuberant in-game instructions for telling the player to repeatedly smash a button?

  - by Michael

  What are some good examples of exuberant in-game instructions for telling the player to repeatedly and quickly press a button or perform an action? I'm especially interested in examples in retro games (e.g., from the NES, SNES, and 1980-90s arcade eras), and I would love to see examples with text, graphics, or both. To illustrate, here are a few examples of the type of instructions that I'm thinking of: Smash the A button to lift something heavy! Toggle the joystick back and forth to break free! Quickly press the button to build power in a meter! I'm working on a 2D iOS game with retro-style pixel art, and there's a point where I want the player to quickly tap on a sprite to complete an action. I have a serviceable starting point -- the word "TAP" flashing with an arrow repeatedly moving downward beneath it: But it still doesn't feel quite right. I would love to see some actual examples from the golden days of 2D gaming to use as reference material. I know examples abound, but I'm just struggling to think of any concrete ones at the moment. Can you think of any examples of this type of thing in old games?

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• RTFMobile

  - by ultan o'broin

  It may seem obvious but it’s worth stating again. The idea that mobile users are going to read lots of user assistance on their devices is just wrong. So, Jakob Nielsen’s post Mobile Content Is Twice as Difficult serves as a timely reminder for anyone thinking of putting manuals as a form of user assistance onto mobile phones. There is also an excellent post on UXMag.com, explaining that one of the ways to screw up with your iPhone app is to throw an old-style user manual into the user experience: 10 Surefire Ways to Screw Up Your iPhone App.   (Image copyright and referenced from UX Magazine 2010)   Instead, user assistance  alternatives—if any at all—include one-time tours, graphics, in-context instructions, and so on. Not so sure that importing “humor” and “personality” work so well in the enterprise app space, myself. However, the message is clear: iPhone users don’t read manuals. Great message. Users will figure it out, and if they can’t, well then your app’s UX is a problem and the app will fail. Shame some teams are obsessed with figuring out ways to port existing manuals to mobile platforms without any thought for the UX. Razorfish’s Scatter/Gather blog says it all: One thing that is particularly discouraging, most material currently available on “Creating Content for the iPad” or similar themes turns out to be about getting traditional content onto, or into, the iPad. Now, manuals for non-end users in PDF format on eReaders is a different matter. I have research on that, but it’s for another post. Technorati Tags: mobile,user assistance,UX,user experience,manuals,documentation

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• Should a programmer "think" for the client?

  - by P.Brian.Mackey

  I have gotten to the point where I hate requirements gathering. Customer's are too vague for their own good. In an agile environment, where we can show the client a piece of work to completion it's not too bad as we can make small regular corrections/updates to functionality. In a "waterfall" type in environment (requirements first, nearly complete product next) things can get ugly. This kind of environment has led me to constantly question requirements. E.G. Customer wants "automatically convert input to the number 1" (referring to a Qty in an order). But what they don't think about is that "input" could be a simple type-o. An "x" in a textbox could be a "woops" not I want 1 of those "toothpaste" products. But, there's so much in the air with requirements that I could stand and correct for hours on end smashing out what they want. This just isn't healthy. Working for a corporation, I could try to adjust the culture to fit the agile model that would help us (no small job, above my pay grade). Or, sweep ugly details under the rug and hope for the best. Maybe my customer is trying to get too close to the code? How does one handle the problem of "thinking for the client" without pissing them off with too many questions?

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• How to design highly scalable web services in Java?

  - by Kshitiz Sharma

  I am creating some Web Services that would have 2000 concurrent users. The services are offered for free and are hence expected to get a large user base. In the future it may be required to scale up to 50,000 users. There are already a few other questions that address the issue like - Building highly scalable web services However my requirements differ from the question above. For example - My application does not have a user interface, so images, CSS, javascript are not an issue. It is in Java so suggestions like using HipHop to translate PHP to native code are useless. Hence I decided to ask my question separately. This is my project setup - Rest based Web services using Apache CXF Hibernate 3.0 (With relevant optimizations like lazy loading and custom HQL for tune up) Tomcat 6.0 MySql 5.5 My questions are - Are there alternatives to Mysql that offer better performance for what I'm trying to do? What are some general things to abide by in order to scale a Java based web application? I am thinking of putting my Application in two tomcat instances with httpd redirecting the request to appropriate tomcat on basis of load. Is this the right approach? Separate tomcat instances can help but then database becomes the bottleneck since both applications access the same database? I am a programmer not a Db Admin, how difficult would it be to cluster a Mysql database (or, to cluster whatever database offered as an alternative to 1)? How effective are caching solutions like EHCache? Any other general best practices? Some clarifications - Could you partition the data? Yes we could but we're trying to avoid it. We need to run a lot of data mining algorithms and the design would evolve over time so we can't be sure what lines of partition should be there.

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• Understanding Visitor Pattern

  - by Nezreli

  I have a hierarchy of classes that represents GUI controls. Something like this: Control-ContainerControl-Form I have to implement a series of algoritms that work with objects doing various stuff and I'm thinking that Visitor pattern would be the cleanest solution. Let take for example an algorithm which creates a Xml representaion of a hierarchy of objects. Using 'classic' approach I would do this: public abstract class Control { public virtual XmlElement ToXML(XmlDocument document) { XmlElement xml = document.CreateElement(this.GetType().Name); // Create element, fill it with attributes declared with control return xml; } } public abstract class ContainerControl : Control { public override XmlElement ToXML(XmlDocument document) { XmlElement xml = base.ToXML(document); // Use forech to fill XmlElement with child XmlElements return xml; } } public class Form : ContainerControl { public override XmlElement ToXML(XmlDocument document) { XmlElement xml = base.ToXML(document); // Fill remaining elements declared in Form class return xml; } } But I'm not sure how to do this with visitor pattern. This is the basic implementation: public class ToXmlVisitor : IVisitor { public void Visit(Form form) { } } Since even the abstract classes help with implementation I'm not sure how to do that properly in ToXmlVisitor. Perhaps there is a better solution to this problem. The reason that I'm considering Visitor pattern is that some algorithms will need references not available in project where the classes are implemented and there is a number of different algorithms so I'm avoiding large classes. Any thoughts are welcome.

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• How can I perform 2D side-scroller collision checks in a tile-based map?

  - by bill

  I am trying to create a game where you have a player that can move horizontally and jump. It's kind of like Mario but it isn't a side scroller. I'm using a 2D array to implement a tile map. My problem is that I don't understand how to check for collisions using this implementation. After spending about two weeks thinking about it, I've got two possible solutions, but both of them have some problems. Let's say that my map is defined by the following tiles: 0 = sky 1 = player 2 = ground The data for the map itself might look like: 00000 10002 22022 For solution 1, I'd move the player (the 1) a complete tile and update the map directly. This make the collision easy because you can check if the player is touching the ground simply by looking at the tile directly below the player: // x and y are the tile coordinates of the player. The tile origin is the upper-left. if (grid[x][y+1] == 2){ // The player is standing on top of a ground tile. } The problem with this approach is that the player moves in discrete tile steps, so the animation isn't smooth. For solution 2, I thought about moving the player via pixel coordinates and not updating the tile map. This will make the animation much smoother because I have a smaller movement unit per frame. However, this means I can't really accurately store the player in the tile map because sometimes he would logically be between two tiles. But the bigger problem here is that I think the only way to check for collision is to use Java's intersection method, which means the player would need to be at least a single pixel "into" the ground to register collision, and that won't look good. How can I solve this problem?

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• Oracle University Seminars April/May/June 2012

  - by A&C Redaktion

  Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Oracle University's Expert Seminars are exclusive events delivered by top experts with years of experience in working with Oracle products. The seminars topics cover the breadth of the Oracle portfolio and are aimed at helping you to get the most of your Oracle products and to stay connected with new technologies. We currently have the following events scheduled: RAC Performance Tuning Online with Arup Nanda - 30 Apr 2012 Understanding Explain Plans & Index Utilization Online with Dan Hotka - 8-9 May 2012 Writing Optimal SQL & Troubleshooting & Tuning with Jonathan Lewis, Düsseldorf, 9-10 May 2012 Flashback Techniques in Oracle11g with Carl Dudley, München, 14 May 2012 Minimize Downtime with Rolling Upgrade using Data Guard with Uwe Hesse, München, 16 May 2012 Enterprise Business Intelligence 11g Advanced Development Online with Mark Rittman – 24-25 May Mastering Backup & Recovery with Francisco Munoz Alvarez, Düsseldorf, 29-30 May 2012 Real World Java EE 6 – Re-thinking Best Practice with Adam Bien, München, 15 Jun 2012

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• xubuntu install on p4

  - by adi

  Hello i am thinking of installing xubuntu on a dell gx260 pentium 4 pc with: 1.8GHz processor 64mb integrated video card(had other but it died on me) 1GB of RAM Ive installed lubuntu but im not enjoying it since i can not make shortcuts of partitions or folders on desktop for faster usability(i dont want them on my bar, want them on desktop) also the buggs i seen on it made me reconsider of using lubuntu:mplayer not working, no video was working,chromium outdated etc and i dont want to stay all day to find solutions over the internet. And seen on internet from xubuntu that theyve had shortcuts for theyre partitions on desktop, and is more attractive.(can some1 tell me if with xubuntu u can make shortcuts on desktop, i mean the shortcuts remain after reboot) 1 more thing to add:at installing lubuntu when it asked me where to install it only showed me the entire hard drive(i have 3 partitions on it) and made me select the size of the lubuntu partition from 1 that the installer wanted.(from local disk D: from windows xp view),need to mention that i have windows xp on the machine which is on local C:, kept my downloads on local D:, and other stuff on E:. I want an ubuntu distro which would work fine especially for internet purpose. Can someone lend me a hand on this?

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• Authentication system brainstorm

  - by gansbrest

  Hi. We got multiple small websites (microsites) and one main high traffic one with big users base. Right now the requirement is to build authentication system which should allow users to loign with the same identity across the network. All website are running on different domains, powered by Drupal 6 CMS and have separate databases (so sharing tables with prefix is not an option + it creates a huge mess in the db). Here is the set of core requirements I came up with: Users should be able to login with the same credentials to all sites within the network User’s data sharing between Main site (storage) and all micro sites within the network Data synchronization across the network when user changes the data (update email or password for example) The login/registration process should be seamless and consistent Register on any of the sites across the network and use that identity to login later on. In the future there might be a need to add openid authentication options. Basically we are looking at something similar stackexchange does, but not sure if they have central users base on not. I was thinking about custom solution which will include 2 parts (modules), one will be stored on the Main site for users data storing and responding to requests from clients. Second part (module) will be placed on each microsite, which is going to send requests to the Master. Some kind of client - server setup. One of the complications I see right away is #3. Data Synhcronization across the network. I just don't want to reinvent the wheel and maybe some work is already done in this direction. Looking forward to your ideas on how to approach this project. EDIT: We use MySQL database

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• How to blend multiple normal maps?

  - by János Turánszki

  I want to achieve a distortion effect which distorts the full screen. For that I spawn a couple of images with normal maps. I render their normal map part on some camera facing quads onto a rendertarget which is cleared with the color (127,127,255,255). This color means that there is no distortion whatsoever. Then I want to render some images like this one onto it: If I draw one somewhere on the screen, then it looks correct because it blends in seamlessly with the background (which is the same color that appears on the edges of this image). If I draw another one on top of it then it will no longer be a seamless transition. For this I created a blendstate in directX 11 that keeps the maximum of two colors, so it is now a seamless transition, but this way, the colors lower than 127 (0.5f normalized) will not contribute. I am not making a simulation and the effect looks quite convincing and nice for a game, but in my spare time I am thinking how I could achieve a nicer or a more correct effect with a blend state, maybe averaging the colors somehow? I I did it with a shader, I would add the colors and then I would normalize them, but I need to combine arbitrary number of images onto a rendertarget. This is my blend state now which blends them seamlessly but not correctly: D3D11_BLEND_DESC bd; bd.RenderTarget[0].BlendEnable=true; bd.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA; bd.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA; bd.RenderTarget[0].BlendOp = D3D11_BLEND_OP_MAX; bd.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE; bd.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_ZERO; bd.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_MAX; bd.RenderTarget[0].RenderTargetWriteMask = 0x0f; Is there any way of improving upon this? (PS. I considered rendering each one with a separate shader incementally on top of each other but that would consume a lot of render targets which is unacceptable)

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• Blur gets displaced compared to original image

  - by user1294203

  I have implemented a SSAO and I'm using a blur step to smooth it out. The problem is that the blurred texture is slightly displaced compared to the original. I'm blurring using a 4x4 kernel since that was my noise kernel in SSAO. The following is the blurring shader: float result = 0.0; for(int i = 0; i < 4; i++){ for(int j = 0; j < 4; j++){ vec2 offset = vec2(TEXEL_SIZE.x * i, TEXEL_SIZE.y * j); result += texture(aoSampler, TexCoord + offset).r; } } out_AO = vec4(vec3(0.0), result * 0.0625); Where TEXEL_SIZE is one over my window resolution. I was thinking that this is was an error based on how OpenGL counts the Texel center, so I tried displacing the texture coordinate I was using by 0.5 * TEXEL_SIZE, but there was still a slight displacement. The texture input to my blur shader, has wrap parameters: glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); When I tell the blur shader to just output the the value of the pixel, the result is not displaced, so it must have something to do with how neighboring pixels are sampled. Any thoughts?

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• Object behaviour or separate class?

  - by Andrew Stephens

  When it comes to OO database access you see two common approaches - the first is to provide a class (say "Customer") with methods such as Retrieve(), Update(), Delete(), etc. The other is to keep the Customer class fairly lightweight (essentially just properties) and perform the database access elsewhere, e.g. using a repository. This choice of approaches doesn't just apply to database access, it can crop up in many different OOD scenarios. So I was wondering if one way is preferable over the other (although I suspect the answer will be "it depends")! Another dev on our team argues that to be truly OO the class should be "self-contained", i.e. providing all the methods necessary to manipulate and interact with that object. I personally prefer the repository approach - I don't like bloating the Customer class with all that functionality, and I feel it results in cleaner code having it elsewhere, but I can't help thinking I'm seriously violating core OO concepts! And what about memory implications? If I retrieve thousands of Customer objects I'm assuming those with the data access methods will take up a lot more memory than the property-only objects?

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