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• FPS camera specification

  - by user1095108

  I remember I once composed a FPS viewing transformation, as a composition of 3 rotations, each with an angle as a parameter. The first angle specified the left/right rotation around the y-axis, the second angle the up/down rotation around the x-axis, and the third around the z-axis. The viewing transformation was therefore specified by 3 angles. Naturally, this transformation had a gimbal lock, depending in what order the transformation were performed. What should I look at to derive my viewing transformation without the gimbal lock? I know the "lookAt" method already, but I consider that cumbersome. EDIT: MY first guess is to do the first 2 transformations to get a viewing direction and then the axis-angle rotation on this axis.

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• How to give parallax backgrounds more depth

  - by user28015

  I have 3 tiled images of some sort of galaxy/space in the background of a 2D Game: The first one has an alpha of 100%, the second an alpha of 80% and the last one has an alpha of 60%. I scroll the the one in the background slower than the other ones of course. classic parallax. In the foreground I have some particles flying towards the player to simulate some dust / stars flying by. (I know that stars don't fly by, but I think we all have seen this in a lot of games). But I can't quite achieve the depth effect I am looking for. I want it to look "deeper". I did read something about using blending modes for the backgrounds, but that would require to render them as objects right? So the question is: What is a good technique to do a scrolling parallax background in GameMaker?

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• Repeater vs. ListView

  - by MoezMousavi

  I do really hate repeater. I was more a GridView lover but after 3.5 be born, I prefer ListView.  The first problem with Repeater is paging. You will need to write code to handle paging. Second common problem is empty data template. Have a look at this:             if (rptMyRepeater.Items.Count < 1)             {                 if (e.Item.ItemType == ListItemType.Footer)                 {                     Label lblFooter = (Label)e.Item.FindControl("lblEmpty");                     lblFooter.Visible = true;                 }             }   I found the above code is usefull if you need to show something like "There is no record" is your data source has no records. Although the ListView has a template.   If you combine ListView with a DataPager, you will be in heaven as it is sorting the paging for you without writing code. (http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.datapager.aspx)     Note: You have got to bind ListView in PreRender, it doesn't work properly in PageLoad   More: http://www.4guysfromrolla.com/articles/061009-1.aspx

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• ubuntu 12.10 slow application load upon restart

  - by Adam

  new ubuntu user. after boot (boot is quite fast), opening applications such as firefox, libra, system settings, takes close to 10 seconds to open. after the application is loaded in RAM, the application opens fine. the system feels snappy, quick. when i have two FIREFOX open, unity is snappy in showing me the two windows side by side. but upon bootup, loading the application takes 10 seconds. there is not much hdd activity. fresh install. its the same for system settings and browsing system settings. when system settings is opened for the first time (10 second), and i click for example Color, it will take quite long to open the color settings. hardware: i3 4gb ram radeon 5770 250gb sata gigabyte h55m motherboard i am using ubuntu straight out of the box, no propriety drivers. 64 bit. i have reinstalled OS, and still the same.

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• css - use universal '*' selector vs. html or body selector?

  - by Michael Durrant

  Applying styles to the body tag will be applied to the whole page, so body { font-family: Verdana } will be applied to the whole page. This could also be done with * {font-family: Verdana} which would apply to all elements and so would seem to have the same effect. I understand the principle that in the first instance the style is being applied to one tag, body for the whole page whereas in the second example the font is being applied against each individual html elements. What I am asking is what is the practical difference in doing that, what are the implications and what is a reason, situation or best practice that leads to using one over another. One side-effect is certainly speed (+1 Rob). I am most interested in the actual reason to choose one over the other in terms of functionality.

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• Must all new features go through betatest?

  - by LTR

  Obviously, small usability fixes and bugfixes go directly into the stable product. What about small new features? Can you afford to just release them after internal testing, or do they have to be betatested by customers first? Situation: This is a young commercial project, produced by a one-person company. It has an existing userbase and is at it's second major version. Previous betatests have produced some results, however most feedback came from the stable product and not from beta versions.

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• How can I teleport seamlessly, without using interpolation?

  - by modchan

  I've been implementing Bukkit plugin for creating toggleable in-game warping areas that will teleport any catched entity to other similar area. I was going to implement concept of non-Euclidean maze using this plugin, but, unfortunately, I've discovered that doing Entity.teleport() causes client to interpolate movement while teleporting, so player slides towards target like Enderman and receives screen updates, so for a split second all underground stuff is visible. While for "just teleport me where I want" usage this is just fine, it ruins whole idea of seamless teleporting, as player can clearly see when transfer happened even without need to look at debug screen. Is there possibility to somehow disable interpolating while teleporting without modifying client, or maybe prevent client from updating screen while it's being teleported?

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• Oracle Endeca Training UK - April 10th, 11th

  - by Grant Schofield

  By popular demand we have decided to hold a second Oracle Endeca Information Discovery Training event in the UK to accommodate those who were unable to get into the first. Training is currently being planned for early May in Switzerland, end of May in Germany and mid-June in Istanbul at the EMEA BI annual event. Date: 10th - 11th April Venue: Oracle Reading, UK A registration link will be sent out shortly, but to avoid disappointment please bookmark this article and block these two days in your diary. You can also register interest by emailing me directly and I will operate a first come, first serve policy - [email protected]

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• Why fgetc too slow?

  - by user14284

  I've written a program that reads an whole file via fgetc: while ((c = fgetc(f)) != EOF) { ... } But the program is too slow. When I changed fgetc to fread, static unsigned char buf[4096]; while ((n = fread(buf, 1, sizeof(buf), f)) > 0) { ... } the program works about 10 times faster. Why? As I know, fgetc is a buffered function, so it should work as fast as the second version with explicit buffer, isn't it?

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• APress Deal of the Day - 19/Nov/2011 - Beginning GIMP

  - by TATWORTH

  Today's$10 Deal of the Day from APress at http://www.apress.com/9781430210702 is "Beginning GIMP". "In this fully-updated second edition, author and long-time member of the GIMP community Akkana Peck introduces the GIMP and shows you everything about it that you'll want to know—including how to prepare images for display on web pages, touch up digital photos, tap into powerful filters, effects, and plug-ins, and automate tasks using scripts." For those of you unfamilar with GIMP it is the GNU Image Manipulation Program and it is available for free from http://www.gimp.org/downloads/   Can't code withoutThe best C# & VB.NET refactoring plugin for Visual Studio

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• Le Patch Tuesday concerne aussi Windows 8 Consumer Preview, et apporte plusieurs correctifs de bogues à l'OS

  Le Patch Tuesday concerne aussi Windows 8 Consumer Preview et apporte plusieurs correctifs de bogues à l'OS Mise à jour du 15/03/2012 Le Patch Tuesday publié mardi dernier par Microsoft apporte quelques correctifs à Windows 8 Consumer Preview. Ces mises à jour intègrent 8 correctifs pour des bugs dans l'OS. Le premier concerne une mise à jour de compatibilité des applications. Le second corrige un problème dans « Broker Infrastructure Service », pouvant conduire au ralentissement des connexions. Un Patch corrige deux bugs dans IE10, pouvant conduire à une fuite de mémoire. Les autres correctifs améliorent la préc...

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• How to refuse to give an access to passwords to a customer without being unprofessional or rude?

  - by MainMa

  Let's say you're creating a website for a customer. This website has its own registration (either combined with OpenID or not). The customer asks you to be able to see the passwords the users are choosing, given that the users will probably be using the same password on every website. In general, I say: either that it is impossible to retrieve the passwords, since they are not stored in plain text, but hashed, or that I have no right to do that or that administrators must not be able to see the passwords of users, without giving any additional details. The first one is false: even if the passwords are hashed, it is still possible to catch and store them on each logon (for example doing a strange sort of audit which will remember not only which user succeeded or failed to logon, but also with which password). The second one is rude. How to refuse this request, without being either unprofessional or rude?

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• how to avoid or minimise use of check/conditional statement?

  - by Muneeb Nasir

  I have scenario, where i got stream and i need to check for some value. if i got my any new value i have to store it in any of data structure. well it seems very easy, i can place conditional statement if-else or can use contain method of set/map to check either received is new or not. but the problem is checking will effect my application performance, in stream i'll receive hundreds for value in second, if i start checking each and every value i received than for sure it effect performance. Any body can suggest me any mechanism or algorithm that solve my issue. either by bypassing checks or atleast minimize them?

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• Error after updating from Ubuntu 10.04 to Ubuntu 10.10

  - by Emerson Hsieh

  Note: This was posted 6 months ago. Please read my answer below. I updated to 10.10 from 10.04 last week. After rebooting it shows "error "prefix" not found" for half a second and then it's stuck at a flashing line forever!! I installed 10.04 again and I didn't upgrade to 10.10 directly because the flashing line looks creepy and I don't want to see it again. What should I do now?? PS: I want to upgrade to 10.10 I am using wubi I hate that flashing line

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• Retrieve data from an ASP.Net application using ADO.Net 2.0 connected model

  - by nikolaosk

  I have been teaching Entity Framework,LINQ to SQL,LINQ to objects,LINQ to XML for some time now. I am huge fan of LINQ to Entities and I am using Entity Framework as my main data access technology. Entity framework is in the second version right now and I can accomplish most of the things I need. I am sure the guys in the ADO.Net team will implement many more features in the future. I am a strong believer that you cannot really understand the benefits of LINQ to SQL or LINQ to Entities unless you...(read more)

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• Another Update to SQL Server Configuration Scripting Utility

  - by Bill Graziano

  I’ve been gradually adding features to my utility that scripts the configuration of a SQL Server.  Since my last post I’ve added the following features: Skip any encrypted object in a database Script alerts, alert notifications and operators Script audits Always script model, master and msdb to capture any user-defined objects in those databases Logins are now scripted so that everything for a login is grouped together. There’s a second section in the logins that handles default databases.  In many cases a login’s default database is a mirror target and can’t be set.  This is now handled gracefully.  It also includes a separate section for all default databases so those can be quickly set in the event of a disaster. Script credentials Script proxy accounts Script database mail My goal is still to get everything outside a database scripted.  This release is enough that I can keep my mirror target servers in sync with their principals.

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• Finding out which tile a mouse click landed in

  - by Shard

  I am working on an icometric grid based game and im having an issue trying to link a mouse click from the user to a tile. I have been able to split the problem into 2 parts which is first finding a rectangle that sourounds a tile, which I have been able to do but the second part of figuring out from the rectangle which tile the click landed in has got me stumped. Here is an example of a rectangle with tiles on the inside: The rectangle is 70px long and 30px high so if i use an input of say 30x(top)/20y(left) how would I go about determining which tile this fell into?

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• Installed 12.04 from CD problems with compiz-core - wont continue - just

  - by user70886

  Installed 12.04 from CD to clean hard drive but on first boot up says problems with compiz-core. Clicked continue with it not installed. After I sent info for help; it came back with some packages are not up to date. Said I need to update compiz-core and libylib2.0-0 Cancelled the process to send info (after second time) but it wont cancel and it wont load the desktop. What do I do now? Right click will let me create a new folder/document or organise desktop by name etc but I cannot see the usual system bar or left menu items. Is there a way to load the terminal and reload the desktop. If this was windows I'd use cntrl alt delete and run explorer to fix the desktop.

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• Can't start ubuntu 11.10, Stops at login screen!

  - by Martinpizza

  I have been trying to dual boot ubuntu with windows 7 via WUBI on my custom built pc but without success. When i start the computer i can choose windows or ubuntu i choose ubuntu and when i should get to the login screen the screen just stays purple/pink. Tried safe mode but cant get in there either. I have tried reinstall but did not work either. :( The second time i install ubuntu the screen was purple/pink and the screen was cut of so the left side was on the right side and right side on left side (hard to describe) Third time installing (The last time) it is just like the first time please help!!!! cant get nowhere without help i am kinda new at ubuntu and its creepy commands. Had ubuntu on my old computer. I think the problem is my hardware so here is my computer specs: Amd Fx 6100 Amd HIS Radeon HD 6950 ICEQ X Asus Sabertooth 990fx 1TB Harddrive I have no idea the name on it Please Help me!! Sorry for my bad English! :D

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• Where to install bootloader when installing Ubuntu as secondary OS?

  - by HelpNeeder

  I'm trying to install Ubuntu as secondary OS on my laptop. I have Windows 8 already installed on my laptop. Now, I know how to run Ubuntu from USB drive, I created addition partition and formatted it to EXT4. So I'm ready to install. Now, 'Device for boot loader installation:' displays: /dev/sta ATA HITACHI (750 GB) /dev/sta1 Windows 8 (loader) /dev/sta2 /dev/sta5 /dev/sta6 Ubuntu 12.04 (12.04) /dev/stb I tries choosing Ubuntu 12.04 partition but it doesn't even let me to pick which OS to install and goes straight to Windows 8. Which partition I must choose to be able to pick which OS to boot from? Preferably, set up so Windows 8 will be at first place, and Ubuntu on second. Any ideas? I don't want to mess up anything if I pick something wrong.

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• Reminder: Free, Global, Virtual Developer Day November 5th

  - by jeckels

  Just a quick reminder about the FREE virtual developer day focused on Coherence (and WebLogic) coming on November 5th. This day, with content tailored for developers, will guide you through tooling updates and best practices around creating applications with WebLogic and Coherence as target platforms. We'll also explore advances in how you can manage your build, deploy and ongoing management processes to streamline your application's life cycle. And of course, we'll conclude with some hands-on labs that ensure this isn't all a bunch of made-up stuff - get your hands dirty in the code!November 5, 20139am PT/12pm ETREGISTER NOW We're offering two tracks for your attendance, though of course you're free to attend any session you wish. The first will be for pure developers with sessions around developing for WebLogic with HTML5, processing live events with Coherence, and looking at development tooling. The second is for developers who are involved in the building and management processes as part of the application life cycle. These sessions focus on using Maven for builds, using Chef and Puppet for configuration and more.We look forward to seeing you there - don't forget to invite a friend!

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• Why doesn't the installer see all of my hard drives?

  - by atodd

  I'm trying to setup a dual boot system with Windows Vista 64 (already installed) and Ubuntu 10.10. I added a new drive which is identical to the one Vista is installed on. When I boot into the LiveCD I can see and mount the second drive and edit it in Gparted. However, when I use the installer it will only bring up the drive that already has Vista installed. I've tried everything I know. I'm not sure if its a BIOS setting or something else I've missed. I've also tried both the desktop and alternate amd64 installs with the same result.

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• how to mask Cocos2d

  - by alex

  Hi i'am iOS developer but i'm new to cocos2d.Im working on new game i use Kobold2d Have cocos2d installed too and i want to make this effect. http://postimage.org/image/ngj399ibn/ I Know how is done on flash, but cant make it in kobold. There 2 images with the same size one is like low-res image for background and the secon hi-res over the first one,when the "reticle" mask move reveal the second image inside the circle and outsite only the background is visible. I was googling with no success, saw some ray wenderlich projects but not helpful.Any help

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• How do I use Content.Load() with raw XML files?

  - by xnanewb

  I'm using the Content.Load() mechanism to load core game definitions from XML files. It works fine, though some definitions should be editable/moddable by the players. Since the content pipeline compiles everything into xnb files, that doesn't work for now. I've seen that the inbuild XNA Song content processor does create 2 files. 1 xnb file which contains meta data for the song and 1 wma file which contains the actual data. I've tried to rebuild that mechanism (so that the second file is the actual xml file), but for some reason I can't use the namespace which contains the IntermediateSerializer class to load the xml (obviously the namespace is only available in a content project?). How can I deploy raw, editable xml files and load them with Content.Load()?

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• How do I install a driver for a Kodak esp 3250 printer?

  - by user108608

  First my system: pentium 4 -don't remember the speed-, 1g ram, dual boot to separate physical drives, Fdos and Lubuntu 12.1 second my lan: I have four computers operating for the same printer. Intel quad core i5, 4g ram, running Windoze 7 64 bit, printer connected and shared from here. Kodak ESP 3250 Gateway 17" laptop running Windoze 7 32bit Asus tablet (small laptop) running Lumbutu 12.1 My dual boot system running Fdos and Lubuntu 12.1 The problem: I downloaded c2esp_25c-1_i386.deb, tried to install it using DEBI Package Installer, it loads the files, looks for cups driver and ends with an error: "Dependancy is not satisfiable: libcupsdriver1 (=1.4.0)" What do I do now? Is there some place that I can get the correct cups driver? further information: The Asus tablet was running Ubuntu 12.1 (very slowly and with a few crashes) and could print from the lan printer with no problems. Is there something in Ubuntu that can be loaded into Lubuntu?

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