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• CodePlex Daily Summary for Sunday, May 02, 2010

  CodePlex Daily Summary for Sunday, May 02, 2010New ProjectsAdventureWorks in Access: AdventureWorks database in Access format. Data has been ported in Access starting from Adventure Works database for SQL Server 2008.amplifi: This project is still under construction. We will add more information here as soon as it is available.ASP.NET MVC Bug Tracker: Bug Track written in C# ASP.NET MVC 2BigDecimal: BigDecimal is an attempt to create a number class that can have large precision. It is developed in vb.net (.net 4).CBM-Command: Coming soon....Chuyou: ChuyouCMinus: A C Minus Compiler!Complex and advanced mathematical functions: Mathematics toolkit is a Class Library Project which help Programmers to Calculate Mathematics Functions easily.Confuser: Confuser is a obfuscator for .NET. It is developed in C# and using Mono.Cecil for assembly manipulation.easypos: Micro punto de venta que permite ventas express de ropa, que se acopla fácil y transaparente con el ERP Click OneElmech Address Book: Web based Address Book for maintaining details of your business clients. This project targets Suppliers - Traders - Manufacturers - users. Applicat...Feed Viewer: Feed Viewer is able to synchronize subscribed feed and red news among all computers you are using. It understands both RSS and Atom format. It can ...Google URL Shortener, C#: Implementation in C# of generating short URLs by Goo.gl service (Google URL Shortener)MARS - Medical Assistant Record System: MARS - Medical Assistant Record SystemRx Contrib: Rx Contrib is a library which contain extensions for the Rx frameworkSimple Service Administration Tool: A simple tool to start/stop/restart a service of a WinNT based system. The tool is placed in the task bar as a notify icon, so the specified servic...Vis3D: Visual 3D controls for Silverlight.VisContent: XML content controls for ASP.NET.Windows Phone 7 database: This project implements a Isolated Storage (IsolatedStorage) based database for Windows Phone 7. The database consists of table object, each one s...New Releases$log$ / Keyword Substitution / Expansion Check-In Policy (TFS - LogSubstPol): LogSubstPol_v1.2010.0.4 (VS2010): LogSubstPol is a TFS check-in policy which insertes the check-in comments and other keywords into your source code, so you can keep track of the ch...Bojinx: Bojinx Core V4.5.1: The following new features were added: You can now use either BojinxMXMLContext or ContextModule to configure your application or module context. ...CBM-Command: Initial Public Demonstration: Initial public demonstration version. Can browse attached drives and display directory of any attached drive. A common question is "How does it w...Confuser: Confuser v1.0: It is the Confuser v1.0 that used to confuse the reverse-engineers :)Font Family Name Retrieval: 2nd Release: Added New MKV Font Extractor application to showcase the library. MKV Font Extractor depends on MKVToolnix to be installed before it will work. R...Google URL Shortener, C#: Goo.gl-CS v1 Beta: Extract the ZIP file to any location. Two files have to be in the same folder!HouseFly controls: HouseFly controls alpha 0.9.6.1: HouseFly controls release 0.9.6.1 alphaIsWiX: IsWiX 1.0.261.0: Build 1.0.261.0 - built against Fireworks 1.0.264.0. Adds support for VS2010 Integration to support WiX 3.5 beta releases.Managed Extensibility Framework (MEF) Contrib: MefContrib 0.9.2.0: Added conventions based catalog (read more at http://www.thecodejunkie.com/2010/03/bringing-convention-based-registration.html) MEF + Unity integ...MARS - Medical Assistant Record System: license: licenseNSIS Autorun: NSIS Autorun 0.1.5: This release includes source code, executable binary, files and example materials.PHP.net: Release 0.0.0.1: This is the first release of PHP.Net. The features available in this release are: new File Save File Save As Open File In the rar file is th...Rx Contrib: V1: Rx Contrib is ongoing effort for community additions for Rx. Current features are: ReactiveQueue: ISubject that does not loose values if there are ...Silverlight 4.0 Popup Menu: Context Menu for Silverlight 4 v1.0: - Added a margin for icon display. - Added the PopupMenuItem class which is a derivative of the DockPanel. - Find* methods can now drill down the v...Silverlight 4.0 Popup Menu: Context Menu for Silverlight 4 v1.1 Beta: - Added a margin for icon display. - Added the PopupMenuItem class which is a derivative of the DockPanel. - Added a AddSeperator method. - The Fin...Simple Service Administration Tool: SSATool 0.1.3: New Simple Service Administration Tool Version 0.1.3 compiled with Visual Studio .NET 2010.sMAPedit: sMAPedit v0.7a + Map-Pack: Required Additional Map-Pack Added: height setting by color picker (shift+leftclick)sMAPedit: sMAPedit v0.7b: Fixed: force a gargabe collection update to prevent pictureBox's memory leaksqwarea: Sqwarea 0.0.228.0 (alpha): This release corrects a critical bug in ConnexityNotifier service. We strongly recommend you to upgrade to this version. Known bugs : if you open...StackOverflow Desktop Client in C# and WPF: StackOverflow Client 0.1: Source code for the sample.TortoiseHg: TortoiseHg 1.0.2: This is a bug fix release, we recommend all users upgrade to 1.0.2VCC: Latest build, v2.1.30501.0: Automatic drop of latest buildVidCoder: 0.4.0: Changes: Added ability to queue up multiple video files or titles at once. These queued jobs will use the currently selected encoding settings. Mul...WabbitStudio Z80 Software Tools: Wabbitemu 32-bit Test Release: Wabbitemu Visual Studio build for testing purposesWindows Phone 7 database: Initial Release v1.0: This project implements a Isolated Storage (IsolatedStorage) based database for Windows Phone 7. The usage of this software is very simple. You cre...YouTubeEmbeddedVideo WebControl for ASP.NET: VideoControls version 1: This zip file contains the VideoControls.dll, version 1.Most Popular ProjectsRawrWBFS ManagerAJAX Control Toolkitpatterns & practices – Enterprise LibraryMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)iTuner - The iTunes CompanionASP.NETDotNetNuke® Community EditionMost Active Projectspatterns & practices – Enterprise LibraryRawrIonics Isapi Rewrite FilterHydroServer - CUAHSI Hydrologic Information System Serverpatterns & practices: Azure Security GuidanceTinyProjectNB_Store - Free DotNetNuke Ecommerce Catalog ModuleBlogEngine.NETDambach Linear Algebra FrameworkFacebook Developer Toolkit

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• Simple one-way synchronisation of user password list between servers

  - by Renaud Bompuis

  Using a RedHat-derivative distro (CentOS), I'd like to keep the list of regular users (UID over 500), and group (and shadow files) pushed to a backup server. The sync is only one-way, from the main server to the backup server. I don't really want to have to deal with LDAP or NIS. All I need is a simple script that can be run nightly to keep the backup server updated. The main server can SSH into the backup system. Any suggestion? Edit: Thanks for the suggestions so far but I think I didn't make myself clear enough. I'm only looking at synchronising normal users whose UID is on or above 500. System/service users (with UID below 500) may be different on both system. So you can't just sync the whole files I'm afraid.

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• Asterisk does not recognise DTMF tones from mobile phones

  - by Eugene van der Merwe

  We have an Asterisk 1.8.7.0 (the Elastix derivative) switchboard. Every since a month ago, seemingly out of the blue, the switchboard does not recognise DTMF tones any more from mobile phones. Testing the switchboard using 7777 works. Testing the switchboard from a normal phones works. Testing the switchboard from a mobile phone fails. Looking at the log file I can't see anything. I used 'asterisk -rvvvv' and 'tail -f /var/log/asterisk/full' to see the live output and scan the logs. I guess I don't see anything because it's simply not recognising the DTMF tones. I did brief research and found an old setting for SIP phones, 'rfc2833compensate=yes', and tried adding this to 'sip_general_custom.conf'. After that I did 'core restart when convenient' but that didn't make any difference. Could anyone give me some additional troubleshooting steps?

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• MySQL Windows vs. Linux: performance, caveats, pros and cons?

  - by gravyface

  Looking for (preferrably) some hard data or at least some experienced anecdotal responses with regards to hosting a MySQL database (roughly 5k transactions a day, 60-70% more reads than writes, < 100k of data per transaction i.e. no large binary objects like images, etc.) on Windows 2003/2008 vs. a Debian-based derivative (Ubuntu/Debian, etc.). This server will function only as a database server with a separate Web server on another physical box; this server will require remote access for management (SSH for Linux, RDP for Windows). I suspect that the Linux kernel/OS will compete less than the Windows Server for resources, but for this I can't be certain. There's also security footprint: even with Windows 2008, I'm thinking that the Linux box can be locked down more easily than the Windows Server. Anyone have any experience with both configurations?

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• eclipse IDE won't start in ubuntu 10.04 64bit with sun-java

  - by aeischeid

  i get this error when I try to run from CLI ** (Eclipse:2318): CRITICAL **: menu_proxy_module_load: assertion `dbusproxy != NULL' failed # A fatal error has been detected by the Java Runtime Environment: # SIGSEGV (0xb) at pc=0x00007f34511a4e74, pid=2318, tid=139863603410704 # JRE version: 6.0_18-b18 Java VM: OpenJDK 64-Bit Server VM (14.0-b16 mixed mode linux-amd64 ) Derivative: IcedTea6 1.8 Distribution: Ubuntu lucid (development branch), package 6b18-1.8-0ubuntu1 Problematic frame: C [libglib-2.0.so.0+0x41e74] g_main_context_prepare+0x164 # An error report file with more information is saved as: /home/aaron/opt/eclipse/hs_err_pid2318.log # If you would like to submit a bug report, please include instructions how to reproduce the bug and visit: https://bugs.launchpad.net/ubuntu/+source/openjdk-6/ The crash happened outside the Java Virtual Machine in native code. See problematic frame for where to report the bug. # I have sun-java installed and set in my PATH: ~: echo $JAVA_HOME /usr/lib/jvm/java-6-sun/

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• What is JavaScript, really?

  - by Lord Loh.

  All this started when I was looking for a way to test my webpage for JavaScript conformance like the W3C HTML Validator. I have not found one yet. So let me know if you know of any... I looked for the official JavaScript page and find ECMA Script. These people have standardized a scripting language (I do not feel like calling it JavaScript anymore!) and called it ECMA-262 (Wikipedia). Their latest work is Edition 5.1 JavaScript was developed my Mozilla Corporation and their last stable version is 1.8.5 (see this) which is based on the ECMA's edition 5.1 The Wikipedia page linked mentions dialects. Mozilla's JavaScript 1.8.5 is listed as a dialect along with JScript 9 (IE) and JavaScript (Chrome's V8[Wiki]) and a lot others. Am I to understand that JavaScript 1.8.5 is a derivative of the ECMA-262 and SpiderMonkey[Wiki] is an engine that runs it? And Chrome has its own dialect and V8 engine is the program that runs it? With all these dialects based off ECMA-262, what I can no longer understand is "What is JavaScript"? Are there any truly cross browser scripting languages? Do the various implementers come together to agree on the dialect cross compatibility? Is this effort ECMA?

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• GPLv2 - Multiple AI chess engines to bypass GPL

  - by Dogbert

  I have gone through a number of GPL-related questions, the most recent being this one: http://stackoverflow.com/questions/3248823/legal-question-about-the-gpl-license-net-dlls/3249001#3249001 I'm trying to see how this would work, so bear with me. I have a simple GUI interface for a game of Chess. It essentially can send/receive commands to/from an external chess engine (ie: Tong, Fruit, etc). The application/GUI is similar in nature to XBoard ( http://www.gnu.org/software/xboard/ ), but was independently designed. After going through a number of threads on this topic, it seems that the FSF considers dynamically linking against a GPLv2 library as a derivative work, and that by doing so, the GPLv2 extends to my proprietary code, and I must release the source to my entire project. Other legal precedents indicate the opposite, and that dynamic linking doesn't cause the "viral" effect of the GPL to propagate to my proprietary code. Since there is no official consensus that can give a "hard-and-fast" answer to the dynamic linking question, would this be an acceptable alternative: I build my chess GUI so that it sends/receives the chess engine AI logic as text commands from an external interface library that I write The interface library I wrote itself is then released under the GPL The interface library is only used to communicate via a generic text pipe to external command-line chess engines The chess engine itself would be built as a command-line utility rather than as a library of any sort, and just sends strings in the Universal Chess Interface of Chess Engine Communication Protocol ( http://en.wikipedia.org/wiki/Chess_Engine_Communication_Protocol ) format. The one "gotcha" is that the interface library should not be specific to one single GPL'ed chess engine, otherwise the entire GUI would be "entirely dependent" on it. So, I just make my interface library so that it is able to connect to any command-line chess engine that uses a specific format, rather than just one unique engine. I could then include pre-built command-line-app versions of any of the chess engines I'm using. Would that sort of approach allow me to do the following: NOT release the source for my UI Release the source of the interface library I built (if necessary) Use one or more chess engines and bundle them as external command-line utilities that ship with a binary version of my UI Thank you.

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• [Dear Recruiter] I developed in Mo'Fusion

  - by refuctored

  Forward: Sometimes I really feel like technology recruiters have no experience or knowledge of the field they are recruting for.  A warning to those companies hiring technical recruiters -- ensure that the technical recruiters you hire to fill a position are actually technical.  Here's proof below, where I make up completely ridiculous technologies, but still have interest from the recruiter for an interview. Letter to me: Hello - Your name came up as a possible match for a long term contract Cold Fusion Developer role I have in Bothell, WA.  This role requires you to be onsite in Bothell, WA. This is  a tough role to fill so I was hoping you might have someone you can recommend? Unfortunately no telecommute. Thank you! Sincerly, Mindy Recruiter My response: Mindy -- Wow I'm super-excited that you took the time to contact me about this position!  Let me tell you, you won't be disappointed with my skill set! Firstly, I've been developing in ColdFusion since 1993 before it was owned by Adobe and it was operating under code name, "Hot-Jack".  Recently I started developing under the Domain-View-Driven-Domain-Model (DVDDM), integrating client-side CF on Moobuntu.  Not only do I have a boat load of ColdFusion EXP,  I also have a ton of experience in the open source communities lesser known derivative of CF, Mo'Fusion (MF).  I've also invested thousands of hours of my time learning esoteric programming languages. Look forward to working with you! George And her response: Hi George – just left you a message. Give me a call at your convenience.  The role does require someone to be onsite here.. are you able to relocate yourself? Mindy [Sigh]

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• Can windows XP be better than any Ubuntu (and Linux) distro for an old PC?

  - by Robert Vila

  The old laptop is a Toshiba 1800-100: CPU: Intel Celeron 800h Ram 128 MB (works ok) HDD: 15GB (works ok) Graphics adapter: Integrated 64-bit AGP graphics accelerator, BitBIT, 3D graphic acceleration, 8 MB Video RAM Only WindowsXP is installed, and works ok: it can be used, but it is slow (and hateful). I thought that I could improve performance (and its look) easily, since it is an old PC (drivers and everything known for years...) by installing a light Linux distro. So, I decided to install a light or customized Ubuntu distro, or Ubuntu/Debian derivative, but haven't been successful with any; not even booting LiveCDs: not even AntiX, not even Puppy. Lubuntu wiki says that it won't work because the last to releases need more ram (and some blogs say much more cpu -even core duo for new Lubuntu!-), let alone Xubuntu. The problems I have faced are: 1.There are thousands of pages talking about the same 10/15 lightweight distros, and saying more or less the same things, but NONE talks about a simple thing as to how should the RAM/swap-partition proportion be for this kind of installations. NONE! 2.Loading the LiveCD I have tried several different boot options (don't understand much about this and there's ALWAYS a line of explanation missing) and never receive error messages. Booting just stops at different stages but often seems to stop just when the X server is going to start. I am able to boot to command line. 3.I ignore whether the problem is ram size or a problem with the graphics driver (which surprises me because it is a well known brand and line of computers). So I don't know if doing a partition with a swap partition would help booting the LiveCD. 4.I would like to try the graphical interface with the LiveCD before installing. If doing the swap partition for this purpose would help. How can I do the partition? I tried to use Boot Rescue CD, but it advises me against continuing forward. I would appreciate any ideas as regards these questions. Thank you

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• General questions regarding open-source licensing

  - by ndg

  I'm looking to release an open-source iOS software project but I'm very new to the licensing side of the things. While I'm aware that the majority of answers here will not lawyers, I'd appreciate it if anyone could steer me in the right direction. With the exception of the following requirements I'm happy for developers to largely do whatever they want with the projects source code. I'm not interested in any copyleft licensing schemes, and while I'd like to encourage attribution in derivative works it is not required. As such, my requirements are as follows: Original source can be distributed and re-distributed (verbatim) both commercially and non-commercially as long as the original copyright information, website link and license is maintained. I wish to retain rights to any of the multi-media distributed as part of the project (sound effects, graphics, logo marks, etc). Such assets will be included to allow other developers to easily execute the project, but cannot be re-distributed in any manner. I wish to retain rights to the applications name and branding. Futher to selecting an applicable license, I have the following questions: The project makes use of a number of third-party libraries (all licensed under variants of the MIT license). I've included individual licenses within the source (and application) and believe I've met all requirements expressed in these licenses, but is there anything else that needs to be done before distributing them as part of my open-source project? Also included in my project is a single proprietary, close-sourced library that's used to power a small part of the application. I'm obviously unable to include this in the source release, but what's the best way of handling this? Should I simply weak-link the project and exclude it entirely from the Git project?

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• How to go from mainstream to indie development?

  - by Salano Software

  I'm currently working as a game programmer for a AAA-level developer and publisher - which falls into the 'nice problem to have' category, I know, except that I'm growing more and more disenchanted with the direction of both the company and the AAA portion of the industry as a whole. I don't see any games on the studio's calendar for the next several years that I'm actually interested in working on; it looks like a continuing parade of sequels, license extensions and largely-derivative work. Which isn't to say that there won't be interesting things to do on those projects; but more and more I find myself wanting to do something fundamentally different. It seems like the market's never been better for smaller-scale projects, and I'd love to jump into that (and I've done small demos for Android and have started digging into iOS), but I obviously can't put anything out while I'm working for the company, and I'm concerned that I shouldn't even do substantial development in my spare time on anything I'd eventually like to release on my own. At the same time, I'm leery of leaving the job I've got for hopefully-obvious reasons, especially without a specific plan in place. Has anyone out there got experience with 'going indie' out of a mainstream job, and does anyone have specific suggestions as to what the best approach is and what I should specifically be thinking about or be careful of?

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• javaws crashes, error in ld-linux-x86-64.so.2

  - by user54214

  I am running Ubuntu 11.10 64 bit client as Dom0 and Xen. I am having problems getting java up and running. Java itself seems to work fine, however I get strange errors, for example when I start javaws. I tried different versions and always get the same errors. I tried openjdk 1.6 and 1.7 as well as sunjava6 and 7. I alway get an error in the same lib All other applications are working fine, so it seems ld-linux-x86-64.so.2 is working fine. Any hints what could be wrong? Ubuntu01:~$ javaws # # A fatal error has been detected by the Java Runtime Environment: # # SIGILL (0x4) at pc=0x00007f4e74c5ad10, pid=7974, tid=139974945277696 # # JRE version: 6.0_23-b23 # Java VM: OpenJDK 64-Bit Server VM (20.0-b11 mixed mode linux-amd64 compressedoops) # Derivative: IcedTea6 1.11pre # Distribution: Ubuntu 11.10, package 6b23~pre11-0ubuntu1.11.10.2 # Problematic frame: # C [ld-linux-x86-64.so.2+0x14d10] _dl_make_stack_executable+0x2b70 # # An error report file with more information is saved as: # /home/r/hs_err_pid7974.log # # If you would like to submit a bug report, please include # instructions how to reproduce the bug and visit: # https://bugs.launchpad.net/ubuntu/+source/openjdk-6/ # The crash happened outside the Java Virtual Machine in native code. # See problematic frame for where to report the bug. # Aborted

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• Submitting software to a competition, it becomes their property?

  - by myrkos

  So I'm about to submit a game to a competition, but as I looked through the rules a chunk grabbed my attention: All Entries become the sole and exclusive property of Sponsor and will not be acknowledged or returned. Sponsor shall own all right, title and interest in and to each Entry, including without limitation all results and proceeds thereof and all elements or constituent parts of Entry (including without limitation the Mobile App, the Design Documents, the Video Trailer, the Playable and all illustrations, logos, mechanicals, renderings, characters, graphics, designs, layouts or other material therein) and all copyrights and renewals and extensions of copyrights therein and thereto. Without limitation of the foregoing, each Eligible Entrant shall and hereby does absolutely and irrevocably assign and transfer all of his or her right, title and interest in his or her Entry to Sponsor, and Sponsor shall have the right and may authorize others to use, copy, sublicense, transmit, modify, manipulate, publish, delete, reproduce, perform, distribute, display and otherwise exploit the Entry (and to create and exploit derivative works thereof) in any manner, including without limitation to embody the Entry, in whole or in part, in apps and other works of any kind or nature created, developed, published or distributed by Sponsor and to and register as a trademark in any country in Sponsor’s name any component of the Entry, without such Eligible Entrant reserving any rights or claims with respect thereto. Sponsor shall have the exclusive right, in perpetuity, throughout the Territory to change, adapt, modify, use, combine with other material and otherwise exploit the Entry in all media now known or hereafter devised and in any manner, in its sole and absolute discretion, without the need for any payment or credit to Entrant. So the game will become the sponsor's property; however, they don't ask for source code. So will I still own the rights to the source code, whatever that means? And if it doesn't win said competition, will I be able to publish it myself without their trademarks? I am very new to software legality stuff, so I would appreciate any clarification. Since there's a possibility I won't even own the source, is it possible to make the game core engine open source software with a not-very-restrictive license and include that in the project, so I at least still own the game engine? Or does it not work that way?

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• "Viral" license that only blocks legal actions of user and developer against each other

  - by Lukasz Zaroda

  I was thinking a lot about software licensing lately, because I would like to do some coding. I'm not an expert in all those licenses, so I came up with my own idea, and before I will put in on paper, I would like to make sure that I didn't reinvent a wheel, so maybe I would be able to use something that exists. Main idea behind my license is to guarantee freedom of use the software, but not "freedom to" (positive) (e.g. freedom to having source code), but "freedom from" (negative) (strictly from legal actions against you). It would be "viral" copyleft license. You would be able to without fear do everything you want with the software (and binaries e.g. reverse engineering), as long as You will include information about author and/or authors, and all derivative works will be distributed with the same license. I'm not interested in anything that would restrict a freedom of company to do something like "tivoization". I'm just trying to accomplish something that would block any legal actions of user and developer, targeted against each other, with the exception of basic attribution. Does exist something like that?

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• Help me choose an Open-Source license

  - by Spartan-117A

  So I've done lots of open-source work. I have released many projects, most of which have fallen under GPL, LGPL, or BSD licensing. Now I have a new project (an implementation library), and I can't find a license that meets my needs (although I believe one may exist, hence this question). This is the list of things I'm looking for in the license. Appropriate credit given for ALL usage or derivative works. No warranty expressed or implied. The library may be freely used in ANY other open-source/free-software product (regardless of license, GPL, BSD, EPL, etc). The library may be used in closed-source/commercial products ONLY WITH WRITTEN PERMISSION. GPL - Useless to me, obviously, as it completely precludes any and all closed-source use, violating requirement (4). BSD/LGPL/MIT - Won't work, because they wouldn't require closed-source developers to get my permission, violating requirement (4). If it wasn't for that, BSD (FreeBSD in particular) would look like a good choice here. EPL/MPL - Won't work either, as the code couldn't be combined with GPL-code, therefore violating requirement (3). Also I'm pretty sure they allow commercial works without asking permission, so they don't meet (4) either. Dual-licensing is an option, but in that case, what combination would hold to all four requirements? Basically, I want BSD minus the commercial use, plus an option to use in commercial/closed-source as long as the developer has my written permission. EDIT: At the moment, thinking something like multiple-licensing under GPL/LGPL plus something else for commercial?

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• Sampling Heightmap Edges for Normal map

  - by pl12

  I use a Sobel filter to generate normal maps from procedural height maps. The heightmaps are 258x258 pixels. I scale my texture coordinates like so: texCoord = (texCoord * (256/258)) + (1/258) Yet even with this I am left with the following problem: As you can see the edges of the normal map still proves to be problematic. Putting the texture wrap mode to "clamp" also proved no help. EDIT: The Sobel Filter function by sampling the 8 surrounding pixels around a given pixel so that a derivative can be calculated in order to find the "normal" of the given pixel. The texture coordinates are instanced once per quad (for the quadtree that makes up the world) and are created as follows (it is quite possible that the problem results from the way I scale and offset the texCoords as seen above): Java: for(int i = 0; i<vertices.length; i++){ Vector2f coord = new Vector2f((vertices[i].x)/(worldSize), (vertices[i].z)/( worldSize)); texCoords[i] = coord; } the quad used for input here rests on the X0Z plane. 'worldSize' is the diameter of the planet. No negative texCoords are seen as the quad used for input for this method is not centered around the origin. Is there something I am missing here? Thanks.

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• Bending of track in a racing game

  - by caius

  I am trying to create a small racing game in which the track would be modeled using a BSpline curve for the path's center line and directional vectors to define the 'bending' of the track at each point. My problem is that I don't know how to calculate the correct bending / slope of the curve, in such a way that it would be optimal or at least visually nice for a car to 'bend in the corner'. My idea was to use the direction of the 2nd derivatives of the curve, however while this approach looks fine for most of the track, there are points in which the 2nd derivative makes sharp 'twists' / very quick 180 degree flips. I also read about 'knots' of bsplines, but I don't know if such 'twist' in 2nd derivatives is a knot or knots are something else. Can you tell me that using a BSpline: 1. How could I calculate a visually nice bending of a track for a racing game? 2. Is it possible to do this by using some simple calculations of centripertal force / gravity? 3. Is it possible to do this by using 1st, 2nd and 3rd derivatives of the BSpline curve? I am not looking for the 'physically correct' bending angle for the track, I would just like to create something which is visually pleasing in a simple game. I am using a framework which has a built-in class for BSpline, including support for 1st, 2nd and 3rd derivatives of the curve.

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• Is there a (family of) monotonically non-decreasing noise function(s)?

  - by Joe Wreschnig

  I'd like a function to animate an object moving from point A to point B over time, such that it reaches B at some fixed time, but its position at any time is randomly perturbed in a continuous fashion, but never goes backwards. The objects move along straight lines, so I only need one dimension. Mathematically, that means I'm looking for some continuous f(x), x ? [0,1], such that: f(0) = 0 f(1) = 1 x < y ? f(x) = f(y) At "most" points f(x + d) - f(x) bears no obvious relation to d. (The function is not uniformly increasing or otherwise predictable; I think that's also equivalent to saying no degree of derivative is a constant.) Ideally, I would actually like some way to have a family of these functions, providing some seed state. I'd need at least 4 bits of seed (16 possible functions), for my current use, but since that's not much feel free to provide even more. To avoid various issues with accumulation errors, I'd prefer the function not require any kind of internal state. That is, I want it to be a real function, not a programming "function".

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• Booting off a ZFS root in 14.04

  - by RJVB

  I've been running a Debian derivative (LMDE) on a ZFS root for half a year now. It was created by cloning a regular ext4-based install with all the necessary packages onto a ZFS pool, chrooting into that pool and recreating a grub menu and bootloader. The system uses an ext-3 dedicated /boot partition. I would like to do the same with Ubuntu 14.04, but have encountered several obstacles. There is no Trusty zfs-grub package The default grub package doesn't have ZFS support built in. I found a small bug in the build system responsible for that (report with patch created) and built my own grub packages. The built-in ZFS support is dysfunctional, it does not add the proper arguments to the kernel command line I thus installed the ZoL grub package I also use on my LMDE system, which does give me a correct grub.cfg However, even with that correct grub.cfg, the boot process apparently doesn't retrieve the bootfs parameter from the ZFS pool; instead the variable that's supposed to receive the value remains empty. As a result, initrd tries to load the default pool ("rpool"), which fails of course. I can however import the pool by hand, and complete the process by hand. If memory serves me well, I also had to disable apparmor, to avoid the boot process from blocking after importing the pool. Am I overlooking something? Just for comparison, I installed the Ubuntu 3.13 kernel on my LMDE system, and that works just fine (i.e. the identical kernel and grub binaries allow successful booting without glitches on LMDE but not on Ubuntu).

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• One sentence descriptions of the various common software licenses?

  - by Rich

  Instead of having to read entire documentation and sift through all the legalese, can someone outline the more common licenses in language that is short and sweet and gets right to the point? Specifically, I'm using a 3rd party control that uses the Apache 2.0 license. My intention is to use this in a proprietary application that I am building for a corporation's use (not resold, but I'm being paid for my work). Does this mean I can or cannot use this control? Does it mean that I must maintain copyright/license information in my code? Does it mean that I must mention copyright/license information in a clearly visible location in the app? EDIT In response to an answer below with a link to an article by Jeff Atwood, the Apache license is described as follows: Apache License Open Permissive 9 Requires derivative works to provide notification of any licensed or proprietary code in a common location. Does this notification need to be in a "common location" in my source code or a common location visible within the app? What if this were a non GUI app (I'm assuming that could very well be my answer)? Thanks for the responses!!!

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• Open source license for test code

  - by Gary

  I'm creating a project to house an iPhone library for common code for the iPhone... essentially it's a library that'll save people from finding solutions to common problems that amount to copying and pasting snippets of code. The site is located here: http://code.google.com/p/devkit-bb/ I licensed it under Eclipse, because fosters the extension of the library without requiring constraints like LGPL on object files being provided/made available, which would be the case since everything is statically linked. What I'm wondering is how/what license to apply to the unit tests? Since they essentially demonstrate how to use various interfaces and components. Thus they're designed for potential copy and paste situations, and I don't want people who might end up using this as part of the building blocks of their environment to feel like the license would prohibit that "derivative work", ie. their application or game.

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• Using Glassfish libraries in proprietary software

  - by Lóránt Pintér

  I would like to use some parts of Glassfish in a proprietary software that are under a CDDL + GPLv2 license. Am I allowed to do that? I haven't modified anything in the code of these libraries, so is this OK, or my software, because it uses these libraries, is still considered derivative work, and thus a big no-no? I mean, according to https://jaxb.dev.java.net/, JAXB is also under CDDL + GPLv2, but I know I can freely use that in proprietary software. Is this because CDDL + GPLv2 actually allows that, or is it distributed under a different license when bundled with the JRE?

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• Neural Network Always Produces Same/Similar Outputs for Any Input

  - by l33tnerd

  I have a problem where I am trying to create a neural network for Tic-Tac-Toe. However, for some reason, training the neural network causes it to produce nearly the same output for any given input. I did take a look at Artificial neural networks benchmark, but my network implementation is built for neurons with the same activation function for each neuron, i.e. no constant neurons. To make sure the problem wasn't just due to my choice of training set (1218 board states and moves generated by a genetic algorithm), I tried to train the network to reproduce XOR. The logistic activation function was used. Instead of using the derivative, I multiplied the error by output*(1-output) as some sources suggested that this was equivalent to using the derivative. I can put the Haskell source on HPaste, but it's a little embarrassing to look at. The network has 3 layers: the first layer has 2 inputs and 4 outputs, the second has 4 inputs and 1 output, and the third has 1 output. Increasing to 4 neurons in the second layer didn't help, and neither did increasing to 8 outputs in the first layer. I then calculated errors, network output, bias updates, and the weight updates by hand based on http://hebb.mit.edu/courses/9.641/2002/lectures/lecture04.pdf to make sure there wasn't an error in those parts of the code (there wasn't, but I will probably do it again just to make sure). Because I am using batch training, I did not multiply by x in equation (4) there. I am adding the weight change, though http://www.faqs.org/faqs/ai-faq/neural-nets/part2/section-2.html suggests to subtract it instead. The problem persisted, even in this simplified network. For example, these are the results after 500 epochs of batch training and of incremental training. Input |Target|Output (Batch) |Output(Incremental) [1.0,1.0]|[0.0] |[0.5003781562785173]|[0.5009731800870864] [1.0,0.0]|[1.0] |[0.5003740346965251]|[0.5006347214672715] [0.0,1.0]|[1.0] |[0.5003734471544522]|[0.500589332376345] [0.0,0.0]|[0.0] |[0.5003674110937019]|[0.500095157458231] Subtracting instead of adding produces the same problem, except everything is 0.99 something instead of 0.50 something. 5000 epochs produces the same result, except the batch-trained network returns exactly 0.5 for each case. (Heck, even 10,000 epochs didn't work for batch training.) Is there anything in general that could produce this behavior? Also, I looked at the intermediate errors for incremental training, and the although the inputs of the hidden/input layers varied, the error for the output neuron was always +/-0.12. For batch training, the errors were increasing, but extremely slowly and the errors were all extremely small (x10^-7). Different initial random weights and biases made no difference, either. Note that this is a school project, so hints/guides would be more helpful. Although reinventing the wheel and making my own network (in a language I don't know well!) was a horrible idea, I felt it would be more appropriate for a school project (so I know what's going on...in theory, at least. There doesn't seem to be a computer science teacher at my school). EDIT: Two layers, an input layer of 2 inputs to 8 outputs, and an output layer of 8 inputs to 1 output, produces much the same results: 0.5+/-0.2 (or so) for each training case. I'm also playing around with pyBrain, seeing if any network structure there will work. Edit 2: I am using a learning rate of 0.1. Sorry for forgetting about that. Edit 3: Pybrain's "trainUntilConvergence" doesn't get me a fully trained network, either, but 20000 epochs does, with 16 neurons in the hidden layer. 10000 epochs and 4 neurons, not so much, but close. So, in Haskell, with the input layer having 2 inputs & 2 outputs, hidden layer with 2 inputs and 8 outputs, and output layer with 8 inputs and 1 output...I get the same problem with 10000 epochs. And with 20000 epochs. Edit 4: I ran the network by hand again based on the MIT PDF above, and the values match, so the code should be correct unless I am misunderstanding those equations. Some of my source code is at http://hpaste.org/42453/neural_network__not_working; I'm working on cleaning my code somewhat and putting it in a Github (rather than a private Bitbucket) repository. All of the relevant source code is now at https://github.com/l33tnerd/hsann.

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• How can I learn the math necessary for working with computer vision?

  - by Duncan Benoit

  I know that computer vision involves a lot of math, but I need some tips about how programmers gain that knowledge. I've started to use the OpenCV library but I have some major problems in understanding how the math works in the algorithms. In college I have studied some math and we worked with matrices and derivatives, but I didn't pay to much attention to the subject. It seemed to be so difficult and useless from a programmer point of view. I suppose that there has to be some easy way to understand what a second derivative is without calculating an equation. (Derivatives are just an example) Do you have any tips for me about how can i gain such knowledge? A forum, book, link, advice, anything?

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• Can I add an additional eula/tos inside my app on top of the iphone app store agreement

  - by nickthedude

  I have an app that allows users to generate and publish content. I would like to possibly be able to use the content they publish/create to make derivative works, ie books etc (similar to what icanhazcheeseburger has done.) If I were to put an opt in alert to ask the user whether or not they would like to be a part of this, would this violate the iphone sdk? I know this is not programming question so I'm not sure if this is a fair question, but I thought I heard something like you can't add a eula you have to abide by whatever apple dictates in their app store agreement. Also if you have suggestions on different ways to approach getting users to agree to this I'm all ears, but yes that is kind of subjective. Thanks folks, Nick

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