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• One-way platforms in UDK

  - by Jordaan Mylonas

  I'm looking to make a multi-player platforming game using UDK. I'm currently doing feasibility research, to make sure I will reasonably be able to do all of the technical things I want to do. The first major hurdle I've come across without being able to find as answer, are one-way platforms. That is to say, platforms through which a player can jump up, but not fall through (unless they choose to). These are commonly seen in games like Mario, Kirby and Smash Bros. Does anyone know how such a system would work within UDK? I can think of solutions that might work for single-player, but not multi.

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• Algorithms for rainfall + river creation in procedurally generated terrain

  - by Peck

  I've recently become fascinated by the things that can be done with procedurally terrain and have started experimenting with world building a bit. I'd like to be able to make worlds something like Dwarf fortress with biomes created from meshing together various maps. So first step has been done. Using the diamond-square algorithm I've created some nice hieghtmaps. Next step is I would like to add some water features and have them somewhat realistically generated with rainfall. I've read about a few different approaches such as starting at the high points of the map, and "stepping" down to the lowest neighboring point, pooling/eroding as it works its way down to sea level. Are there any documented algorithms with this or are they more off the cuff? Would love any advice/thoughts.

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• Soft lockup after upgrade - cannot install from live CD

  - by nbm

  I dual-boot MacIntel Core 2 duo. nVidia graphics. Ran upgrade from ubuntu 13.10 to 14.04 (64 bit). On restart ran into {numbers} Bug: soft lockup - CPU#0 stuck for 22s! [swapper/0:1] Tried loading earlier kernel: same problem Tried re-installing ubuntu from a liveCD that has worked in the past: version 13.04. Same problem. Tried re-partitioning hard drive using Mac OS X disk utility and then installing ubuntu 14.04LTS from liveCD. Same problem. Not possible to verify liveCD disk (creates same "soft lockup" bug.) Tried installing from the liveCD with version 13.04 that I know works (that's how I got Ubuntu on this machine in the first place.) Same problem. I know this is not a hardware problem as OS X works just fine, I am using it right now on the same machine. I have been using various versions of Ubuntu for 2 years. Things I cannot do: Open a terminal Verify CD image Start ubuntu from CD (same soft lockup problem) This problem is similar to some other questions, none of which have been satisfactorily answered: Ubuntu 14.04 soft lockup on Vostro 3500 Cannot do fresh install of Ubuntu 13.04 while booting from DVD: "soft lockup" bug Live CD stalls when installing Ubuntu 13.10 UPDATE 6/11/14: Following some much-appreciated advice from bain (see below) I burned a 12.04LTS disk and started with kernel parameters: noapic, no1apic, acpi=off, nomodeset, elevator=deadline, and clocksource=jiffies. With all of these parameters I was able to load the 12.04LTS CD ("Try without installing"). It worked fine. However, as soon as I tried to install Ubuntu from the CD, my wired ethernet (eth0) connection would hang. There are already various askubuntu questions and bug reports about this problem, none of which had answers for me. (E.g., dhclient eth0 does nothing, none of the various reset commands does anything, manually setting IP &etc does nothing. I could reliably kill the ethernet connection by clicking "install ubuntu" every single time.) I could go ahead and install 12.04 without an internet connection, but the install would freeze after mostly completing (I tried several times.) There were some relevant error messages in the details of the install output script that, IIRC, had to do with searching for missing files and not being able to access eth0 (internet) to get them. To be honest I gave up at that point and I'm not sure I wrote those down. If I find some notes I will post them. At this point I no longer have Ubuntu on my system. I wiped the partitions and am using exclusively OS X. I am leaving this question in case it helps anyone else with similar problems. I love open source and I love Linux, and the next machine I get I will probably just build from Arch. At the moment I miss repositories and a lot of other things about Ubuntu, but the OS X terminal is 'nix, I can pretty much use all the open source apps I like, and while I am not a fan of the Apple software it gets the job done for me. Unlike Ubuntu, which can't even install. I realize this isn't necessarily a place for a soapbox speech, but when I first installed 12.04 several years ago there were already people in the community complaining that Canonical was going too "commercial". But I loved it. Several years later and all I've seen is Canonical adding more not-so-useful bells and whistles to Ubuntu while continually failing to fix basic problems on upgrades. With a dual-boot (and sometimes triple-boot) system it always took me some tweaking to get an upgrade to work, and to some extent that is okay. But at this point I feel like Canonical ought to just put a price tag on Ubuntu. All I see is more commercialism and advertising and product tie-ins, and ongoing problems do not get fixed. I am a big fan of open-source, not-for profit enterprise. I am also a big fan of for-profit enterprise, which certainly has its place and usefulness. I am not a fan of companies who pretend to be in favor of open source but really are just out to make a buck, and IMNSHO that is what Canonical has become. This is a great community and I wish you all the best, but my next install of Linux will not be Ubuntu.

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• SilverlightShow for 13-19 Dec 2010

  - by Dave Campbell

  I still haven't updated my friends at SilverlightShow, but I have their list from last week. Check out the Top Five most popular news at SilverlightShow for last week (13 - 19 Dec 2010). First place for the past week takes the post about Mahesh Sabnis' sample Line-Of-Business app using Silverlight 4. A lot of clicks and downloads got also the recording of SilverlightShow webinar 'Building an end-to-end Silverlight 4 Application' presented by Gill Cleeren on Dec 15th. Here is SilverlightShow's weekly top 5: Line of Business (LOB) Application using Silverlight 4, WCF 4, EF 4 and Commanding Architecture Recording, Demos and Slides of the Webinar 'Build an End-to-end Silverlight 4 Application' SilverlightShow Content Updating to Silverlight 4 Free Webcam Photo Application in Silverlight Unit testing MVVM in Silverlight - SDN Event-Code and Slides Visit and bookmark SilverlightShow. Stay in the 'Light

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• Byte Size Tips: How to Insert a YouTube Video Into a PowerPoint Presentation in Office 2013

  - by Taylor Gibb

  How many times have you needed to show a video during a presentation? Using YouTube and PowerPoint, it is now possible. Insert a YouTube Video Into a PowerPoint Presentation in Office 2013 Go ahead and open PowerPoint and switch over to the Insert tab. Then click on Video, and then Online Video… If this is your first time inserting a video from YouTube, you will need to add it as a provider from the bottom left hand side of the dialog. Once added, you will be able to enter a search term. You can then simply select a video and hit the insert button. That’s all there is to it. Remember Videos come with their own set of editing options, so be sure to take a look around.     

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• Join us for 2 JCP sessions today + beer

  - by heathervc

  Remember to join the 2 JCP sessions at JavaOne this afternoon in the Hilton.  First up the JCP.Next panel with JCP EC Members, followed by the 101 Ways to Participate BOF.  Stop in to learn what's new and how you can make the future Java and enjoy a beer or 2.  We will also be in the OTN Java Demogrounds in the Hilton Grand Ballroom from 4:00 - 4:30 PM.  Hope to see you there. JCP.Next: Reinvigorating Java Standards Session ID: BOF6272 Location: Hilton San Francisco - Plaza A/B Date and Time: 10/1/12, 4:30 PM - 5:15 PM 101 Ways to Improve Java: Why Developer Participation Matters Session ID: BOF6283 Location: Hilton San Francisco - Continental Ballroom 4 Date and Time: 10/1/12, 5:30 PM - 6:15 PM

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• Are there any specific workflows or design patterns that are commonly used to create large functional programming applications?

  - by Andrew

  I have been exploring Clojure for a while now, although I haven't used it on any nontrivial projects. Basically, I have just been getting comfortable with the syntax and some of the idioms. Coming from an OOP background, with Clojure being the first functional language that I have looked very much into, I'm naturally not as comfortable with the functional way of doing things. That said, are there any specific workflows or design patterns that are common with creating large functional applications? I'd really like to start using functional programming "for real", but I'm afraid that with my current lack of expertise, it would result in an epic fail. The "Gang of Four" is such a standard for OO programmers, but is there anything similar that is more directed at the functional paradigm? Most of the resources that I have found have great programming nuggets, but they don't step back to give a broader, more architectural look.

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• We have a 200% increase of "organic" search traffic - how to figure out which keyword is causing this?

  - by Robert Grezan

  So our Google Analytics are showing us that 200% increase of "organic" search traffic. Analytics are saying that search keyword is "(not provided)". We are wondering how to find out which keyword is causing this? We are monitoring all important keywords for our website. None of keyword is in first 5, so our "organic" serach traffic is modest. However, today we received 200% increase of "organic" search traffic but none of keywords we can think of moved a bit. We also did not change anything related to SEO. And what is interesting Google Webmaster shows no changes - ~2500 impressions and ~200 clicks. How to find out which "keyword" might be causing this spike?

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• What the best way to wire up Entity Framework database context (model) to ViewModel in MVVM WPF?

  - by hal9k2

  As in the question above: What the best way to wire up Entity Framework database model (context) to viewModel in MVVM (WPF)? I am learning MVVM pattern in WPF, alot of examples shows how to implement model to viewModel, but models in that examples are just simple classes, I want to use MVVM together with entity framework model (base first approach). Whats the best way to wire model to viewModel. Thanks for answers. //ctor of ViewModel public ViewModel() { db = new PackageShipmentDBEntities(); // Entity Framework generated class ListaZBazy = new ObservableCollection<Pack>(db.Packs.Where(w => w.IsSent == false)); } This is my usual ctor of ViewModel, think there is a better way, I was reading about repository pattern, not sure if I can adapt this to WPF MVVM

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• Help building pygtk application

  - by umpirsky

  This is my application. It is created with quickly. I would like to package it for Ubuntu now. I tried to package it with uickly, but that failed. At first, I was trying to install it using setup.py. But it is only copied in python lib dir, no icon, no desktop file installed. Then I tried to follow this guide, but I ended up with package without icon and it was of bad quality, but most important of all, it does not use setup.py, and it was pretty complicated. I would like to automate packaging process Can someone point me in the right direction, some examples of existing apps that have automated packaging etc? Thanks in advance.

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• Reminder: Oracle Solaris 11 Beta Exam Ending Soon!

  - by Paul Sorensen

  Just a quick reminder that the beta exam for the new "Oracle Certified Associate, Oracle Solaris 11 System Administrator" certification will be ending on April 28th. I'd like to invite anyone that has held off on becoming certified to consider taking beta exam. Participating in our Oracle's certification beta exams is a very inexpensive way to get certified, and you can be one of the first few people to become certified on Oracle Solaris 11. Please note that in order to earn your Oracle Solaris 11 OCA you are not required to attend a course from Oracle (of course you pass the test).Quick Links: Beta Exam: Oracle Solaris 11 System Administration (1Z1-821) Certification Track: Oracle Certified Associate, Oracle Solaris 11 System Administrator Certification Website: About Beta Exams Register Now: Pearson VUE

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• How to learn what the industry standards/expectations are, particularly with security?

  - by Aerovistae

  For instance, I was making my first mobile web-application about a year ago, and half-way through, someone pointed me to jQuery Mobile. Obviously this induced a total revolution in my app. Rewrote everything. Now, if you're in the field long enough, maybe that seems like common knowledge, but I was totally new to it. But this set me wondering: there are so many libraries and extensions and frameworks. This seems particularly crucial in the category of security. I'm afraid I'm going to find myself doing something in a professional setting eventually (I'm still a student) and someone's going to walk over and be like, My god, you're trying to secure user data that way? Don't you know about the Gordon-Wokker crypto-magic-hash-algorithms library? Without it you may as well go plaintext. How do you know what the best ways are to maximize security? Especially if you're trying to develop something on your own...

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• Is there an antipattern to describe this method of coding?

  - by P.Brian.Mackey

  I have a codebase where the programmer tended to wrap things up in areas that don't make sense. For example, given an Error log we have you can log via ErrorLog.Log(ex, "friendly message"); He added various other means to accomplish the exact same task. E.G. SomeClass.Log(ex, "friendly message"); Which simply turns around and calls the first method. This adds levels of complexity with no added benefit. Is there an anti-pattern to describe this?

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• Content, MetaData and Taxonomy 2 Overview of the Data Layer

  This article is cross-posted from my personal blog. In DotNetNuke version 5.3, we introduced the concept of a centralized Content store, together with the ability to apply Taxonomies (categories) to the content. We have extended this in DNN 5.4 by completing the MetaData API as well as adding Folksonomy (user tags). In this series of blogs I will explain how developers can take advantage of these new features in their own extensions. In the first blog in this series I covered the Taxonomy Manager...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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• The new Google Analytics - what new useful features have you found?

  - by Rob

  If you don't know already a new version of Google Analytics has just come out. On first initial views it doesn't seem like much of an improvement on the previous version. There's lot's linking to Google's social stats but I'm yet to see the value of that. Also it doesn't seem to make the best use of the important data, it's tending to push referral sites, keywords to the back and bring the less important data to the front. Is that a sign of things to come??? One feature I did find interesting was the visitors flow as it shows the visitors path through your site. What new features have you found useful/interesting?

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• Hosting cross-domain Silverlight applications (XAP)

  In the Silverlight world, there are two types of cross-domain things that may leave some banging their head against a wall for a while. The first involves making network-based calls (WebClient, HttpWebRequest, etc) to services hosted on a domain other than the one that is the site of origin for the XAP. This is solved by ensuring the service provider enables a clientaccesspolicy.xml file for their service. More information here: Cross Domain Policy Files with Silverlight. NOTE: site of origin is...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 do you set up PhysFS for use in a game?

  - by ThePlan

  After my recent question on GD I've been advised to use PhysFS to pack all my game data in 1 file. So I have, and the decission wasn't light, because I've tried out every library in my answers but none contained a single good tutorial whatsoever, in fact PhysFS is the poorest documented library I've ever seen. After attempting to set up PhysFS in my game I realized it's not as simple as adding the headers to the project, it appears something much more complicated, in fact after my first attempt to install PhysFS the compiler ran out of memory to display errors, it reached the critical count of 50 errors. So basically what I'm asking here is: How can I set up PhysFS on my game? I'm using Code::Blocks IDE on Windows XP SP3;

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• How to restart WiFi interface without rebooting (it drops connection)?

  - by Dima

  I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection! How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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• Why can't I copy files to var/www/html?

  - by Alaa M.

  I copy some files, go to /var/www/html, right click, Paste isn't available. Why is that? I tried the command sudo nautilus, it opened the files navigation window, I navigated to /html, still the same problem. I also tried gksudo nautilus but it said: The program 'gksudo' is currently not installed. You can install it by typing: sudo apt-get install gksu I installed it, tried again, same problem. What should I do? edit: Figures that I was accessing the files inside a .zip directory and I shoulda extracted them first. Solved

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• How do you show the desktop in a blink in Ubuntu?

  - by e-satis

  We know you can either click on the show desktop icon or use CTRL+ALT+D to ask Ubuntu to show the desktop. Unfortunately, this does not always show the desktop in one action. Sometime, and this is true for at least the last 4 version of the OS, it brings up first to the front all the windows, THEN, with a second click, show you the desktop. This is very annoying, as when you show the desktop it generally to quickly click on a shortcut. To understand what I'm talking about, open 7 windows, minimize some, bring some to the front, maximize one, then show the desktop. Then do that on Windows. You'll see the difference.

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• Crontab opens as blank page, cannot save

  - by Sarah

  I am really not familiar with linux, and only started using it recently, so be patient with me. I am trying to control a camera on regular intervals through a script that is called upon in the crontab. When I start up the computer, I can open crontab, edit and save, and everything is executed correctly. However, I can never open crontab a second time, unless I restart the computer first. If I type crontab -e, I get a blank page, located in the /tmp directory. I can enter my commands in there, but cannot save it. I don't know if this is relevant, but when I try sudo crontab -e, I get something like "no cron installed for root". Any help is really appreciated! Sarah

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• Why bother writing an Windows 8 app?

  - by Dennis Vroegop

  So you want to know more about development for Window 8. Great! There are lots of reasons you should be excited about this. Since I don’t know why YOU are interested in this, I’ll make a list of reasons people can choose from. (as a side note: whenever I talk about Win8 development I am referring to the Metro Style / WinRt side of things. Apps for the ‘classic’ desktop side of Win8 on Intel are business as usual…) So… Why would you care about making an app for Windows 8? 1. It’s cool. Let’s not beat around the bush: if you like development for a hobby then you’ll love to work on this new platform. You can create apps in a relative short time (short time as in compared to writing a new CRM system) and that makes it great for a hobby product. 2. You’ll stand out. Hey, we all need an ego boost every now and then. We all need to feel special. So if you can manage to be one of the first to have you app in the Store then you’ll likely to be noticed. Just close your eyes for a moment and image you standing in a bar. It’s crowded, and then you casually say “Oh yeah, I just had my app certified and it’s in the Win8 store now”. People will stop talking, will offer you drinks and beautiful women / gorgeous man / furry creatures from Alpha Centauri (whatever your preferences are) will propose. Or maybe not. Anyway…. 3. Make some cash! IDC predicts there will be about 350,000,000 Windows 8 licenses sold in the next year. Think about that number. 350,000,000. And they all have access to the Store. Where you’re app will be. With one little click they can select it, download and somehow magically $1.00 or $2.00 from their bank account is transferred to yours. Now, I am not saying that all of those people will download and buy your app but what if only 1% of them did? Remember: there aren’t that many apps available yet….. 4. Learn. Creating new small apps is a great way to learn new stuff. Yes, you could read about it (on this blog for instance) but the only way to learn something is to do it. So be prepared for the future and learn something new by doing it.Write an app! Now! 5. The biggie (for me at least): it’s fun. Even if you remove the points above it’s still fun to write for these devices and this platform. Now some of you will say : “But why not write a great app for IOS or Android?” I think this is a valid question. Of course the novelty of the platform wears out and points 2 and 3 from above list will not be as relevant as it is today. But still 1 4 and 5 remain. And don’t forget: if you already work on the Microsoft platform it’s not that hard to learn this new Win8 stuff. If you have done some XAML development (be it WPF or Silverlight) you are almost there in becoming a good Win8 developer. So you’ll be more productive much sooner than when you have to learn Objective C or Java. Even if you’re a HTML / Javascript developer (I say developer here, not designer) you’ll be up to speed on Win8 development pretty soon. Yes, you, that funky Web Developer who lives and breathes HTML5, CSS3 and JavaScript / Node.Js / JQuery: you too can be a Win8 developer. A first class Win8 developer! So.. Download the stuff you need from http://dev.windows.com install Windows 8 and Visual Studio 12 and by the time you’re ready I’ll be working on the next article: how to do all this? Happy coding!

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• Both Webmin & ISPConfig won't work on my Ubuntu Linode

  - by SERVE-U

  I followed the steps on this page to download and setup Webmin on my Linode Ubuntu server, however, when I try to visit https + my.ip.add.ress + :10000, the page just hangs and nothing loads. I already looked into my firewall settings. I uninstalled Webmin and installed ISPConfig and all its dependencies, and the same thing happens at https + my.ip.add.ress + :8080. This is my first time managing a server so there could be something I overlooked. But my server is a pretty vanilla Ubuntu 12.10 with LAMP stack installed exactly as per the instructions in Linode's documentation.

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• How to remove a package from the list of packages to be installed in apt-get?

  - by George

  After I tried installing vim using apt-get install, apt-get keeps giving me a segmentation fault while trying to install vim-runtime. I'm pretty sure it's just with that one specific package, and whenever I try to do apt-get install to install any other package, vim-runtime is in the list of packages that will be installed, and it's always the first package that tries to install, so I can't install any other packages. How can I remove vim-runtime from the list of packages that will be installed? It always shows up even if it is not a dependency of a package I want to install. Note: This is on an Ubuntu rootfs running on ARM.

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• Black screen after installing Ubuntu 11.10

  - by Abbas

  I downloaded Ubuntu 11.10 one week ago and burned it to a CD. I installed it on my system which has a 1.5 TB hard. It installed successfully and I clicked on the restart button. The computer restarted and I chose the first option, which was to load Ubuntu. A black screen would appear with a cursor in top left hand side and I think the system was hung. I repeated this process by erasing the last Ubuntu install but I faced a similar problem. Can anybody help me?

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