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• /lib/i386-linux-gnu/libc.so.6 causing segmentation fault & session crash

  - by Fred Zimmerman

  I am having repeated and frequent crashes ending session whenever I take certain actions such as loading gmail under Chrome. Oddly, the same is not happening when I go to gmail under Chrome. After rooting around in /var/logs it appears to me that he trigger is something to do with libc.so.6 (see below). How can I fix this? 23936.947] [ 23936.947] Backtrace: [ 23936.948] 0: /usr/bin/X (xorg_backtrace+0x49) [0xb7745089] [ 23936.948] 1: /usr/bin/X (0xb75bf000+0x189d7a) [0xb7748d7a] [ 23936.948] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb759c40c] [ 23936.948] 3: /usr/bin/X (0xb75bf000+0xfade7) [0xb76b9de7] [ 23936.948] 4: /usr/bin/X (ValidatePicture+0x1d) [0xb76bcb8d] [ 23936.949] 5: /usr/bin/X (CompositePicture+0xc3) [0xb76bcc83] [ 23936.949] 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb6f18000+0xcf542) [0xb6fe7542] [ 23936.949] 7: /usr/bin/X (0xb75bf000+0x10b1d7) [0xb76ca1d7] [ 23936.949] 8: /usr/bin/X (CompositeGlyphs+0xc4) [0xb76b6d84] [ 23936.949] 9: /usr/bin/X (0xb75bf000+0x104956) [0xb76c3956] [ 23936.949] 10: /usr/bin/X (0xb75bf000+0xfe6f1) [0xb76bd6f1] [ 23936.949] 11: /usr/bin/X (0xb75bf000+0x3798d) [0xb75f698d] [ 23936.949] 12: /usr/bin/X (0xb75bf000+0x253ba) [0xb75e43ba] **[ 23936.950] 13: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb721d4d3] [ 23936.950] 14: /usr/bin/X (0xb75bf000+0x256f9) [0xb75e46f9] [ 23936.950] [ 23936.950] Segmentation fault at address 0x155 [ 23936.950] Caught signal 11 (Segmentation fault). Server aborting [ 23936.950] Please consult the The X.Org Fou**ndation support at http://wiki.x.org for help. [ 23936.950] Please also check the log file at "/var/log/Xorg.0.log" for additional information.

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• How to document requirements for an API systematically?

  - by Heinrich

  I am currently working on a project, where I have to analyze the requirements of two given IT systems, that use cloud computing, for a Cloud API. In other words, I have to analyze what requirements these systems have for a Cloud API, such that they would be able to switch it, while being able to accomplish their current goals. Let me give you an example for some informal requirements of Project A: When starting virtual machines in the cloud through the API, it must be possible to specify the memory size, CPU type, operating system and a SSH key for the root user. It must be possible to monitor the inbound and outbound network traffic per hour per virtual machine. The API must support the assignment of public IPs to a virtual machine and the retrieval of the public IPs. ... In a later stage of the project I will analyze some Cloud Computing standards that standardize cloud APIs to find out where possible shortcomings in the current standards are. A finding could and will probably be, that a certain standard does not support monitoring resource usage and thus is not currently usable. I am currently trying to find a way to systematically write down and classify my requirements. I feel that the way I currently have them written down (like the three points above) is too informal. I have read in a couple of requirements enineering and software architecture books, but they all focus too much on details and implementation. I do really only care about the functionalities provided through the API/interface and I don't think UML diagrams etc. are the right choice for me. I think currently the requirements that I collected can be described as user stories, but is that already enough for a sophisticated requirements analysis? Probably I should go "one level deeper" ... Any advice/learning resources for me?

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• Distributed Rendering in the UDK and Unity

  - by N0xus

  At the moment I'm looking at getting a game engine to run in a CAVE environment. So far, during my research I've seen a lot of people being able to get both Unity and the Unreal engine up and running in a CAVE (someone did get CryEngine to work in one, but there is little research data about it). As of yet, I have not cemented my final choice of engine for use in the next stage of my project. I've experience in both, so the learning curve will be gentle on both. And both of the engines offer stereoscopic rendering, either already inbuilt with ReadD (Unreal) or by doing it yourself (Unity). Both can also make use of other input devices as well, such as the kinect or other devices. So again, both engines are still on the table. For the last bit of my preliminary research, I was advised to see if either, or both engines could do distributed rendering. I was advised this, as the final game we make could go into a variety of differently sized CAVEs. The one I have access to is roughly 2.4m x 3m cubed, and have been duly informed that this one is a "baby" compared to others. So, finally onto my question: Can either the Unreal Engine, or Unity Engine make it possible for developers to allow distributed rendering? Either through in built devices, or by creating my own plugin / script?

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• What would be a good filter to create 'magnetic deformers' from a depth map?

  - by sebf

  In my project, I am creating a system for deforming a highly detailed mesh (clothing) so that it 'fits' a convex mesh. To do this I use depth maps of the item and the 'hull' to determine at what point in world space the deviation occurs and the extent. Simply transforming all occluded vertices to the depths as defined by the 'hull' is fairly effective, and has good performance, but it suffers the problem of not preserving the features of the mesh and requires extensive culling to avoid false-positives. I would like instead to generate from the depth deviation map a set of simple 'deformers' which will 'push'* all vertices of the deformed mesh outwards (in world space). This way, all features of the mesh are preserved and there is no need to have complex heuristics to cull inappropriate vertices. I am not sure how to go about generating this deformer set however. I am imagining something like an algorithm that attempts to match a spherical surface to each patch of contiguous deviations within a certain range, but do not know where to start doing this. Can anyone suggest a suitable filter or algorithm for generating deformers? Or to put it another way 'compressing' a depth map? (*Push because its fitting to a convex 'bulgy' humanoid so transforms are likely to be 'spherical' from the POV of the surface.)

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• Track sales and commission with third-party tool

  - by Andrew

  I have a clothing website where I link to various clothing retailers. I have reached an agreement with one of the retailers whereby they will pay a commission to us for every sale they make from traffic that was referred by our site. I need a mechanism for tracking how much commission should be paid to us, that involves as little work as possible to implement from their side. We both have Google Analytics. Option 1: They record a goal in their GA account whenever someone makes a purchase on their site. They see how many completed goals are marked as referral traffic from our site and calculate commission accordingly. The problem with this is that the whole process of calculating and paying commission will be manual. They will need to frequently check how many sales were generated by referral traffic from our site, and probably we will have to chase them for commission payments. Also - since we won't have access to their GA data - we will need to trust that they report all sales accurately. Option 2: Sign them up to an affiliate network like Commission Junction or Google's Affiliate Network, and connect to them through this network. The problem with this solution is that it seems too heavyweight; ideally we don't want to ask a retailer to go through the whole sign up process just to deal with us and pay us commission. I am assuming that there must be some lightweight service that tracks the number of sales by one site and pays commission accordingly to the other site, where the sign up and installation procedure is simple and fast.

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• Advantage of Software Development [on hold]

  - by user93319

  The worth of a brand that a corporation carries is way too high than its physical presence. If you are venturing into an online business, you need to take special care about the corporate image of your business. Nowadays, it is very important for every organization to have its own website. To enhance the online presence of a company it is important to have a good website design as well as the blueprint of the design. A quality site can enhance organizational growth and it can lend a hand an in achieving company’s goals promptly. When websites have gained so much meaning, it is advisable for an organization to seek professional support for the construction of its own exclusive portals. Expert help may again is essential when one needs for a complete renovation on the Web. Any group is necessary to do a bit of introspection before it make a decision to look for the services of a professional web software development company. It is good to be completely clear-headed regarding one’s requirements. To start with, a business should be familiar with who its potential clientele are. Once this main factor has been give consideration, an association can go ahead and get its website designed accordingly. On approaching a corporation that offers software development services India to its customers, a client can make sure that their site is ready with all the most up-to-date features. Professional Assistance Matters Professional service supplier is identified to furnish a site with easy to use features that prompt visitors to come back again and again. Yet one more benefit of receiving aid from professionals is that they can let you know of the type of content that you should place on display over your site. For example, a business that wants to draw the interest of experts belong to the corporate world must make sure that the language used on its website is crisp and official.

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• Ubuntu 12.04 Frequent Kernel Panics

  - by Jordan Johns

  Dealing with what seems to be quantum behavior here. I'm having frequent Kernel panics and the problem is very hard to locate. To cut to the chase of what is going on I am essentially getting this screen: This occurs always after login (login screen is fine, can go into my TTY's and everything). But once I log in I have anywhere from 0 (instant) to 10 seconds before everything grinds to a halt and freezes. The only way I found out that it was a kernel panic was going into a TTY while it happens. At first, I figured something must be wrong with memory. Ran memtest86, full standard test. No errors. OK. CPU problem? Windows works fine, ran prime95 and a bunch of other torture tests for many hours. Drive problem? Nope. fsck reports no problems and the smart status is ok. Overclocking problem? Nope. Windows is working fine, and I also reset the bios to prove the point it was not the cause. At a loss here, even trying to reinstall the thing it gives me the same problem even attempting to install ubuntu (like right after you try to select "install ubuntu" or "try ubuntu first before installing"). Anyone have any thoughts? Its very bizarre, its as if my system hates linux and is trying to tell me not to use it (that would be a terrible reality). Thanks!

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• When does implementing MVVM not make sense

  - by Kelly Sommers

  I am a big fan of various patterns and enjoy learning new ones all the time however I think with all the evangelism around popular patterns and anti-patterns sometimes this causes blind adoption. I think most things have individual pros and cons and it's important to educate what the cons are and when it doesn't make sense to make a particular choice. The pros are constantly advocated. "It depends" I think applies most times but the industry does a poor job at communicating what it depends ON. Also many patterns surfaced from inheriting values from previous patterns or have derivatives, which each one brings another set of pros and cons to the table. The sooner we are more aware of the trade off's of decisions we make in software architecture the sooner we make better decisions. This is my first challenge to the community. Even if you are a big fan of said pattern, I challenge you to discover the cons and when you shouldn't use it. Define when MVVM (Model-View-ViewModel) may not make sense in a particular piece of software and based on what reasons. MVVM has a set of pros and cons. Let's try to define them. GO! :)

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• Trying to find a recent - PHP book - that utilizes SOLID principles! [closed]

  - by darga33

  Pulling my hair out! I have heard of Martin Fowler's book PoEAA and the other book Head First OOA OOD but those are not in PHP. I desperately want to read them, but ONLY in PHP utilizing the - SOLID acronym - principles! Does anyone know of the absolute best, most recent PHP book that utilizes the SOLID principles and GRASP, and all the other best practices? I want to learn from the best possible source! Not beginner books! I already understand OOP. This seems like an almost impossible question to find the answer to and so I thought, hey, might as well post on stackexchange!! Surely someone out there must know!!!!!!!!!! Or if noone happens to know, Maybe they know of an open source application that utilizes these principles that is relatively small that is not a framework. Something that I can go through every single class, and spend time understanding the insides and outs of how the program was developed. Thanks so much in advance! I really really really really appreciate it! Well it looks like we aren't supposed to ask about best books, so nevermind this question! Sorry about that!

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• Scaling along an arbitrary axis (Dealing with non-uniform scale)

  - by Jon

  I'm trying to build my own little engine to get more familiar with the concepts of 3D programming. I have a transform class that on each frame it creates a Scaling Matrix (S), a Rotation Matrix from a Quaternion (R) and concatenates them together (S*R). Once i have SR, I insert the translation values into the bottom of the three columns. So i end up with a transformation matrix that looks like: [SR SR SR 0] [SR SR SR 0] [SR SR SR 0] [tx ty tz 1] This works perfectly in all cases except when rotating an object that has a non-uniform scale. For example a unit cube with ScaleX = 4, ScaleY = 2, ScaleZ = 1 will give me a rectangular box that is 4 times as wide as the depth and twice as high as the depth. If i then translate this around, the box stays the same and looks normal. The problem happens whenever I try to rotate this scaled box. The shape itself becomes distorted and it appears as though the Scale factors are affecting the object on the World X,Y,Z axis rather than the local X,Y,Z axis of the object. I've done some pretty extensive research through a variety of textbooks (Eberly, Moller/Hoffman, Phar etc) and there isn't a ton there to go off of. Online, most of the answers say to avoid non-uniform scaling which I understand the desire to avoid it, but I'd still like to figure out how to support it. The only thing I can think off is that when constructing a Scale Matrix: [sx 0 0 0] [0 sy 0 0] [0 0 sz 0] [0 0 0 1] This is scaling along the World Axis instead of the object's local Direction, Up and Right vectors or it's local Z, Y, X axis. Does anyone have any tips or ideas on how to handle construction a transformation matrix that allows for non-uniform scaling and rotation? Thanks!

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• Central renderer for a given scene

  - by Loggie

  When creating a central rendering system for all game objects in a given scene I am trying to work out the best way to go about passing the scene to the render system to be rendered. If I have a scene managed by an arbitrary structure, i.e., an octree, bsp trees, quad-tree, kd tree, etc. What is the best way to pass this to the render system? The obvious problem is that if simply given the root node of the structure, the render system would require an intrinsic knowledge of the structure in order to traverse the structure. My solution to this is to clip all objects outside the frustum in the scene manager and then create a list of the objects which are left and pass this simple list to the render system, be it an array, a vector, a linked list, etc. (This would be a structure required by the render system as a means to know which objects should be rendered). The list would of course attempt to minimise OpenGL state changes by grouping objects that require the same rendering operations to be performed on them. I have been thinking a lot about this and started searching various terms on here and followed any additional information/links but I have not really found a definitive answer. The case may be that there is no definitive answer but I would appreciate some advice and tips. My question is, is this a reasonable solution to the problem? Are there any improvements that I could make? Are there any caveats I should know about? Side question: Am I right in assuming that octrees, bsp trees, etc are all forms of BVH?

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• What are the requirements to test a website using jquery.get() ? [migrated]

  - by Frankie

  I am working on a simple website. It has to search quite a few text files in different sub-folders. The rest of the page uses jquery, so I would like to use it for this also. The function I am looking at is .get() for downloading the files. So my main question is, can I test this on my local computer (Ubuntu Linux) or do I have to have it uploaded to a server? Also, if there's a better way to go about this, that would be nice to know. However, I'm more worried about getting it working. Thanks, Frankie PS: Heres the JS/jQuery code for downloading the files to an array. g_lists = new Array(); $(":checkbox").each(function(i){ if ($(this).attr("name") != "0") { var path = "../" + $(this).attr("name") + ".txt"; $("#bot").append("<br />" + path); // debug $.get(path, function(data){ g_lists[i] = data; $("#bot").html(data); }); } else { g_lists[i] = ""; } }); Edit: Just a note about the path variable. I think it's correct, but I'm not 100% sure. I'm new to web development. Here's some examples it produces and the directory tree of the site. Maybe it will help, can't hurt. . +-- include ¦   +-- jquery.js ¦   +-- load.js +-- index.xhtml +-- style.css +-- txt    +-- Scripting_Tools    +-- Editors.txt    +-- Other.txt Examples of path: ../txt/Scripting_Tools/Editors.txt ../txt/Scripting_Tools/Other.txt Well I'm a new user, so I can't "answer" my own question, so I'll just post it here: After asking for help on a IRC chat channel specific to jQuery, I was told I could use this on a local host. To do this I installed Apache web server, and copied my site into it's directory. More information on setting it up can be found here: http://www.howtoforge.com/ubuntu_debian_lamp_server Then to run the site I navigated my browser to "localhost" and everything works.

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• How to distinguish doc, ppt, xls files, without looking at file extension

  - by Shelby. S

  So I was wondering how would you differentiate ppt, xls and doc files from each other in linux regardless of extensions. I tried 'file' but from the looks of it, all of MSOffice files are categorized under the same file type. Similarly I'm having trouble with docx, xlsx and pptx files, since they're essentially all zip files containing a bunch of xml. I also tried a python script importing the magic module, but no go. I'm trying to identify the actual file for a sandbox analysis. And for this specific purpose I need to find the actual file type in order to run it in the sandbox vm (the Windows vm runs everything by extension). Let's say my sample file is labeled as try.exe, but in reality it's just a doc file. My script will rename it as try.exe.doc, which would work fine for doc files. But since linux identifies all MSOffice files as simple DOC files then there's no way to identify ppt or xls files. As a result the sandbox wont' analyze the sample correctly.

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• cpnfigure open_basedir under Plesk

  - by cori

  This might be a question for ServerFault, and f it wasn't for the Plesk aspect I would ask it there to start with, so if it's better suited for over there let me know and I'll move it. I'm working on a dedicated server set up as a reseller account with Plesk to manage the domains and server configuration, and i need to add a directory to the local open_basedir configuration for a specific vhost. Given Plesk's normal methodology, I expected to be able to go to /var/www/vhost/{%DOMAINNAME%}/conf and modify vhost.conf and place a new value there, as I have successfully done with other configuration settings for this domain (turning safe_mode off, for instance). When I do so, however, the new setting doesn't take (per phpinfo();). If I edit httpd.conf (which the plesk configuration specifically says not to do in the notes at the top of httpd.conf) the setting takes. Is there something specific about the open_basdir setting that makes it not configurable in vhost.conf? How much trouble am I letting myself in for by editing the vhost-specific httpd.conf (I imagine is someone makes changes in the plesk web interface it might be overwritten, but what other risk is there)? Thanks!

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• How do I backup my customer's data?

  - by marcamillion

  If you run a SaaS app, or work on one, I would love to hear from you. Where the safety and security of your customer's data is paramount, how do you secure it and back it up? I would love to know your main host (e.g. Heroku, Engine Yard, Rackspace, MediaTemple, etc.) and who you use for your backup. Be as detailed as possible - e.g. a quick overview of your service and the data you store (images for instance), what happens with the images when the user uploads them (e.g. they go to your Linode VPS, and posted to the site for them to see - then they are automatically sent to AWS or wherever, then once a week they are backed up to tape by the managed hosting provider, and you also back them up to your house/office). If you could also give some idea as to what the unit cost (per GB/per user/per month) of storage is - on average, I would really appreciate that. Getting ready to launch my app, and I would love to get some more perspective on the nitty gritty details involved. Thanks!

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• Shutdown issue on persistent LiveUSB

  - by John K

  A) Downloaded Ubuntu to a Windows 7 temp directory from: http://www.ubuntu.com/download/ubuntu/download (Ubuntu 11.10 - Latest version / 32-bit). The output was a .iso file. B) Created a bootable USB stick using Universal USB Installer: http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/. Did not select "Persistent file". Result: Tried it in a Dell Latitude D630 Dell laptop: works every time, many startups and shutdowns. C) Repeated B) but with "Persistent file" set. Works once or twice, but then, just locks on the Ubuntu splash screen. E) Downloaded LiveUSB Install from http://live.learnfree.eu/download, which created a file on Windows 7 called live-usb-install-2.3.2.exe. F) Ran the above installer with "Persistent file" to a 4GB ScanDisk (formatted) thumb drive. Result: Worked pretty good for a while. Shutdown and rebooted several times. Changed items like creating a new directories - all worked. Then: Setup an Admin account with a password and no auto login. On next reboot, it required the password and logged in correctly. Tried to shutdown via the top left icon - Shutdown menu option. Key issue: Would not shutdown, but would always go back to the login prompt. Could successfully login. Finally, shutdown (which just put me back to the login window), and hard shutdown with the power switch. Result: On reboot, just locks on the Ubuntu splash screen. Questions (note, very new to Linux): Did I shutdown wrong (I mean prior to the hard power off)? Is the persistence option very unstable, or am I doing something else completely wrong?

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• Does the google crawler really guess URL patterns and index pages that were never linked against?

  - by Dominik

  I'm experiencing problems with indexed pages which were (probably) never linked to. Here's the setup: Data-Server: Application with RESTful interface which provides the data Website A: Provides the data of (1) at http://website-a.example.com/?id=RESOURCE_ID Website B: Provides the data of (1) at http://website-b.example.com/?id=OTHER_RESOURCE_ID So the whole, non-private data is stored on (1) and the websites (2) and (3) can fetch and display this data, which is a representation of the data with additional cross-linking between those. In fact, the URL /?id=1 of website-a points to the same resource as /?id=1 of website-b. However, the resource id:1 is useless at website-b. Unfortunately, the google index for website-b now contains several links of resources belonging to website-a and vice versa. I "heard" that the google crawler tries to determine the URL-pattern (which makes sense for deciding which page should go into the index and which not) and furthermore guesses other URLs by trying different values (like "I know that id 1 exists, let's try 2, 3, 4, ..."). Is there any evidence that the google crawler really behaves that way (which I doubt). My guess is that the google crawler submitted a HTML-Form and somehow got links to those unwanted resources. I found some similar posted questions about that, including "Google webmaster central: indexing and posting false pages" [link removed] however, none of those pages give an evidence.

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• Is this an acceptable approach to undo/redo in Python?

  - by Codemonkey

  I'm making an application (wxPython) to process some data from Excel documents. I want the user to be able to undo and redo actions, even gigantic actions like processing the contents of 10 000 cells simultaneously. I Googled the topic, and all the solutions I could find involves a lot of black magic or is overly complicated. Here is how I imagine my simple undo/redo scheme. I write two classes - one called ActionStack and an abstract one called Action. Every "undoable" operation must be a subclass of Action and define the methods do and undo. The Action subclass is passed the instance of the "document", or data model, and is responsible for committing the operation and remembering how to undo the change. Now, every document is associated with an instance of the ActionStack. The ActionStack maintains a stack of actions (surprise!). Every time actions are undone and new actions are performed, all undone actions are removed for ever. The ActionStack will also automatically remove the oldest Action when the stack reaches the configurable maximum amount. I imagine the workflow would produce code looking something like this: class TableDocument(object): def __init__(self, table): self.table = table self.action_stack = ActionStack(history_limit=50) # ... def delete_cells(self, cells): self.action_stack.push( DeleteAction(self, cells) ) def add_column(self, index, name=''): self.action_stack.push( AddColumnAction(self, index, name) ) # ... def undo(self, count=1): self.action_stack.undo(count) def redo(self, count=1): self.action_stack.redo(count) Given that none of the methods I've found are this simple, I thought I'd get the experts' opinion before I go ahead with this plan. More specifically, what I'm wondering about is - are there any glaring holes in this plan that I'm not seeing?

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• starting up with VPS or cloud hosting? [closed]

  - by FlyOn

  Possible Duplicate: How to find web hosting that meets my requirements? Summary: I want to start hosting my product. I'd like to register domains (at some point). I'm a linux beginner. Thinking about scalability and price, I'm thinking am I better off on a VPN to get started or would some form of cloud hosting be better (not being familiar with either). Full question: I'm creating a product where people can create their own 3D representations of whatever data / info they have, and (re)organise that data. The product is coming along beautifully on my local environment, but it's about time I start getting some form of hosting ready, and I could really use some advice where / how to get started: I'd like people to be able to move/register their own domains on my server. I could start without this just to demo the product, but it would be the very first on the todo list. I'd like to automatically copy some files / install databases etc for each domain. I probably want to see if I can let users manage their own subdomains at some points, but for now: I'd like start as simple as possible. I've always on a windows machine, so my linux experience is quite basic. I really don't mind getting into it, but I'm thinking it's better to get my product out first of all and see where to go from there. Although... I'd like things to be scalable. If I set up some reseller VPN now which only scales to 100 domains or so, which means I have to set up something else / move again when I pass that level, or which means that I'm in trouble if I suddenly get lots of new customers... hmm. Finally, I need to start cheap. I'm putting all I have into starting this company, and live on very little. So before I have any customers, 50 dollars a month is a fair bit and 100 dollars a month may be too much. If anyone has some tips to help get me started I'd be really grateful.

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• Learning good OOP design & unlearning some bad habits

  - by Nick

  I have been mostly a C programmer so far in my career with knowledge of C++. I rely on C++ mostly for the convenience STL provides and I hardly ever focus on good design practices. As I have started to look for a new job position, this bad habit of mine has come back to haunt me. During the interviews, I have been asked to design a problem (like chess, or some other scenario) using OOP and I doing really badly at that (I came to know this through feedback from one interview). I tried to google stuff and came up with so many opinions and related books that I don't know where to begin. I need a good through introduction to OOP design with which I can learn practical design, not just theory. Can you point me to any book which meets my requirements ? I prefer C++, but any other language is fine as long as I can pick-up good practices. Also, I know that books can only go so far. I would also appreciate any good practice project ideas that helped you learn and improve your OOP concepts. Thanks.

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• Which Graphics/Geometry abstraction to choose?

  - by Robz

  I've been thinking about the design for a browser app on the HTML5 canvas that simulates a 2D robot zooming around, sensing the world around it. I decided to do this from scratch just for fun. I need shapes, like polygons, circles, and lines in order to model the robot and the world it lives in. These shapes need to be drawn with different appearance attributes, like border/fill style/width/color. I also need to have geometry functions to detect intersections and containment for the robot's sensors and so that the robot doesn't go inside stuff. One idea for functions is to have two totally separate libraries, one to implement graphics (like drawShape(context, shape)) and one for geometry operations (like shapeIntersectsShape(shape1, shape2)). Or, in a more object-oriented approach, the shape objects themselves could implement methods to do their own graphics (shape.draw(context)) and geometry operations (shape1.intersects(shape2)). Then there is the data itself: whether the data to draw a shape and the data to do geometric operations on that shape should be encapsulated within the same object, or be separate structures (where one would contain the other, or both be contained inside another structure). How do existing applications that do graphics/geometry stuff deal with this? Is there one model that is best, or is each good for certain applications? Should the fact that I'm using Javascript instead of a more classical language change how I approach the design?

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• Create indefinitely oscillating pendulum in Farseer Physics 3.3.1/Box2d

  - by GONeale

  I am new to Farseer Physics and using version 3.3.1. I am after some help and would even be happy to receive Box2d answers just to ensure I get a response as I should then be able to convert it! -- Thanks ...After a lot of tinkering around I have managed to produce a thin vertical rectangle shape on the screen and I wish this to swing back and forth pinned at the top up to an angle I set (90 degrees would be fine for this sample). When it is approaching the top I wish it to slow down, then fall back the way it just came, increase speed then obviously slow to a stop at the top again. Almost how a swinging pirate ship would work at a theme park. This is the code I have so far which swings the shape, but it is seeming to lose speed on each swing eventually grinding to a halt: float playerWidth = ConvertUnits.ToSimUnits(5), playerHeight = ConvertUnits.ToSimUnits(68); playerPosition = ConvertUnits.ToSimUnits(-350, 0); playerBody = BodyFactory.CreateRectangle(World, playerWidth, playerHeight, 2f, playerPosition); playerBody.BodyType = BodyType.Dynamic; // create player sprite based on player body _rectangleSprite = new Sprite(ScreenManager.Assets.TextureFromShape(playerBody.FixtureList[0].Shape, MaterialType.Player, Color.Orange, 1f)); // Create swinging joint var joint = JointFactory.CreateFixedRevoluteJoint(World, playerBody, ConvertUnits.ToSimUnits(0, -34), playerBody.Position); If somebody could also provide the command I would need to pause the shape on a mouse click or keyboard command at it's current angle and then continue when I let go of the mouse click that would be super fantastic! (I actually posted this on StackOverflow as well before I realised there was a dedicated game development forum) Cheers

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• How to Assure an Effective Data Model

  As a general rule in my opinion the effectiveness of a data model can be directly related to the accuracy and complexity of a project’s requirements. For example there is no need to work on very detailed data models when the details surrounding a specific data model have not been defined or even clarified. Developing data models when the clarity of project requirements is limited tends to introduce designed issues because the proper details to create an effective data model are not even known. One way to avoid this issue is to create data models that correspond to the complexity of the existing project requirements so that when requirements are updated then new data models can be created based any new discoveries regarding requirements on a fine grain level.  This allows for data models to be composed of general entities to be created initially when a project’s requirements are very vague and then the entities are refined as new and more substantial requirements are defined or redefined. This promotes communication amongst all stakeholders within a project as they go through the process of defining and finalizing project requirements.In addition, here are some general tips that can be applied to projects in regards to data modeling.Initially model all data generally and slowly reactor the data model as new requirements and business constraints are applied to a project.Ensure that data modelers have the proper tools and training they need to design a data model accurately.Create a common location for all project documents so that everyone will be able to review a project’s data models along with any other project documentation.All data models should follow a clear naming schema that tells readers the intended purpose for the data and how it is going to be applied within a project.

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• How do install Ubuntu from a USB stick?

  - by Sophia

  When I go to the boot menu on my computer and select USB stick, the screen goes black and there comes a flickering underline. Like I could write something. But I can't. Whatever I push, nothing happens. Except the PrintScrn/SysRq button. When I push it, mu computer beeps. I get no choose menu. Nothing. I found out the usb stick is in msdos format. So what format should I use and how can I format it? I am not a computer geek who knows everything. I'm just a beginner. And only 16 years old. I've got a new problem. The screen isn't black anymore. Now there comes an error message: SYSLINUX 4.04 CHS 20110518 Copyright (C) 1994-2011 H.Peter Anvin et al ERROR:No configurationfile found No DEFAULT or UI configuration directive found! boot: And when I write something: boot:example Could not find kernel image:example boot: Why does this fail all the time? ps. I'm using Ubuntu Oneiric 11.10.

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• Missed OpenWorld? Fear not. Customer Service Presentations for you!

  - by Tuula Fai

  As a Customer Service professional, you know the most frightening thing is having mission-critical systems go down when you’re trying to support customers. So while others are munching on candy this Halloween, why not spend your time listening to these Oracle OpenWorld sessions?   Oracle Service Vision and Roadmap Oracle RightNow Cross-Channel Contact Center Oracle RightNow Web Customer Service Oracle RightNow Chat Cloud Service & Oracle RightNow Virtual Assistant Cloud Service Oracle RightNow Social Customer Service Oracle RightNow Cloud Service - Upgrades Oracle Service – EBS Field Service Oracle Service – Siebel Service Oracle Service – Siebel Field Service In these presentations, you will learn the latest capabilities available in Oracle’s Service solutions for delivering a great customer experience. Like the ability to … Serve Your Customers Anywhere to maintain one seamless dialogue Turn Your Contact Center into a Profit Center by giving personal offers Use Social to Get Ahead of Service Issues by capturing and responding to posts Offer Help a Click Away on your support site at the point of need Humanize Web Self-Service with a Virtual Assistant that uses natural conversation As journalist Robert Liparulo said, “Knowledge was like candy: you never turned it down, especially if you didn't have to work too hard to get it.” It’s right here. Listen, Learn and Lead.

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