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• Behavior tree implementation details

  - by angryInsomniac

  I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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• Is there a quasi-standard set of attributes to annotate thread safety, immutability etc.?

  - by Eugene Beresovksy

  Except for a blog post here and there, describing the custom attributes someone created, but that do not seem to get any traction - like one describing how to enforce immutability, another one on Documenting Thread Safety, modeling the attributes after JCIP annotations - is there any standard emerging? Anything MS might be planning for the future? This is something that should be standard, if there's to be any chance of interoperability between libraries concurrency-wise. Both for documentation purposes, and also to feed static / dynamic test tools. If MS isn't doing anything in that direction, it could be done on CodePlex - but I couldn't find anything there, either. <opinion>Concurrency and thread safety are really hard in imperative and object-languages like C# and Java, we should try to tame it, until we hopefully switch to more appropriate languages.</opinion>

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• Change players state and controls in-game

  - by Samurai Fox

  I'm using Unity 3D Let's say the player is an ice cube. You control it like a normal player. On press of a button, ice transforms (with animation) into water. You control it completely different than the ice cube. Another great example would be: Player is human being and has normal FPS controls. On press of a button human transforms into birds and now has completely different controls. Now, my question is, what would be easier and better: make one object with animation transition and to stay in that state of anim. until button is pressed again make two object: ice and water. Ice has an animation of turning into water. So replace ice (with animation) with water object And if anyone knows this one too: how to switch between 2 different types of player controls.

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• How to log out with a command in a gnome-less environment?

  - by octosquidopus

  I installed various window managers (Awesome, dwm, etc.) from which I am not able to log out back to the login screen (gnome-session) in order to switch to another window manager. I need to reboot to do that, which is a waste of time. Question How can you log out via the terminal? didn't work.. dbus-send --session --type=method_call --print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.Logout uint32:1 ..neither did this: gnome-session-save --force-logout ..nor that: gnome-session-quit --force-logout they all returned: Failed to call logout: The name org.gnome.SessionManager was not provided by any .service files Is there a quick way to log out back into Gnome's session manager from a non-Gnome desktop manager using a terminal emulator? I know that CTRL+ALT+BACKSPACE can be configured to restart X, but I'm looking for the easiest way to log out.

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• Easiest Way To Implement "Slow Motion" and variable game speed in XNA?

  - by TerryB

  I have an XNA 4.0 game that I want to be able to switch into slow motion and back again to full speed every now and then. So if you kill an enemy the game switches into slow motion as they explode and then goes back to normal. What is the easiest way to do this in XNA 4.0 without having to alter all my existing code that relies on GameTime? I have some code that relies on the TotalGameTime, which will be wrong unless I get XNA to slow down. Is there anyway to avoid refactoring that code? Thanks!

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• Is there a way to disable a particular pci port

  - by mxdog

  I have a MB with 2 nics on it. a switch burned up and took out one of them. there is no way to turn them off individually in the bios. is there a way to turn off one of the ports. unmap it,unbind it, power it down so the system doesnt see it at after boot. they are mapped as 0000:02.08.0 and 0000:02.08.1 I want to turn the second one off somehow. Since they both use the same driver, blacklisting the module will take out both of them. Normally I would just live with it but it seems there should be a way to do that like in windows (gasp)--just disable it. I Actually have the exact same problem on another comp running XCP so this will be a 2fer if it gets figured out. the OS is 12.4 lts server with xen on it. THX

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• How to remove all that country-specific dictionaries (like En_AU, En_CA, de_CH, etc)?

  - by Ivan

  After I've installed some language packs and spell checking dictionaries (I'd like to use with Firefox and OpenOffice) I've got tons of language variations installed. This makes very inconvenient to maintain dictionary additions, for example. Sometimes Firefox decides to switch to Australian, sometimes to UK dictionary, sometimes to US, etc. For me, a Russian, English is just English, and German is just German. I think every English-speaking will understand me, may I write "color" or "colour", "dialog", or "dialogue" (I usually prefer classic UK spelling though, as a matter of a habit (as I was taught at school)). How to remove all those dialects?

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• Low graphics mode on ubuntu 12.10 with intel 4000

  - by Amey Jah

  I recently upgraded to 12.10 (fresh install). Now I am facing wierd problem, randomly for when I boot I get a message of low graphics. For now, I switch to console using alt+f1 and then rebboot. On reboot, I select recovery mode, allow system to boot and then again reboot. Now I select normal mode and my graphics loads smoothly. Could you please tell me what could e the issue? I have Dell inspiron 5230 with Intel 4000 onboard graphics. --Amey

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• Not getting auto login page on my Hathway internet connection

  - by Vasu

  I am using firefox browser and my laptop is DELL Inspiron 1545. I am using Hathway internet connection. When i switch on my internet modem and try to use(browse any website), for the first time in a day it will redirect me to Hathway's login(something like "login.hatyway.com/.....") page automatically. It is working fine in windows but not in Ubuntu 11.10. So I go back to windows every time and then login and then i come back to ubuntu to use. Could you please let me know if there is a solution to this problem.

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

  - by Taylor Gibb

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

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• Desktop dims when Thunderbird and Firefox are launched

  - by deshmukh

  I am running Ubuntu 12.04 (almost default install regularly updated) Unity interface on ASUS X53U (AMD Brazos Dual Core C60 with 2GB RAM). On launching Thunderbird and Firefox, the application dims and the cursor changes to wait mode. In case of Thunderbird, this is most pronounced with the wait time of up to a minute. Memory status checked with free indicates around 500MB of free memory on such occasions. The OS is stable and I can switch to a different work-space, etc. What could this be? Is this something normal?

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• How can I get wireless working on an HP-Mini 110-3150?

  - by jfmessier

  I just got an HP Mini 110-3150, and booting from an external hard disk with Ubuntu 10.10 works all fine, except that there is no wireless detected. I noticed that the Wireless indicator is red under Ubuntu, but is enabled under whatever Windows 7 I got on it. So, I understand that it may not get detected at all by Ubuntu at startup time, and there is no manual switch that I can simply slide to turn on/off. How can I get the Wireless device turned ON by default at startup time, and is there any special driver I need to install (proprietary or not) to get it working ? Merci :-) Update: When actually installing on the computer, as a new install, the NIC is not detected at first, but upon restarting, I get a notification of a closed driver available for the wireless. Once installed, updated and restarted, it works fine.

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• How do I get the point coords of a rotated SFML shaperect?

  - by user15498

  I am trying to get collisions of bullets working, and am using SFML. I am using code to get the position of the points of the rectangle for collisions, however I think there's a way to do this without having to get points but by simply getting the points from SFML, since the shape is a rectangle and the points are stored in that way. Is there a way to do that? Through a combination of getPoint() and getGlobalBounds() maybe? While on this topic, is it better to use shapeRects or sprites? I used to only use sprites, however with the addition of textures and more low level stuff I think it would be best to switch to using rectangles and setting their size.

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• Debugging Minimum Translation Vector

  - by SyntheCypher

  I implemented the minimum translation vector from codezealot's tutorial on SAT (Separating Axis Theorem) but I'm having an issue I can't quite figure out. Here's the example I have: As you can see in top and bottom left images regardless of the side the of the green car which red car is penetrating the MTV for the red car still remains as a negative number also here is the same example when the front of the red car is facing the opposite direction the number will always be positive. When the red car is past the half way through the green car it should switch polarity. I thought I'd compensated for this in my code, but apparently not either that or it's a bug I can find. Here is my function for finding and returning the MTV, any help would be much appreciated: Code

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• How to prevent WLAN connection from dropping permanently?

  - by Chris

  I have a desktop with a Fritz USB WLAN N stick and tried Ubuntu 12.04. Installation went fine and WLAN is working. However, connection drops permanent. Reconnecting manually fixes it but after a few minutes it drops again. It's connected to a Vodafone 802 box with WLAN N fix set. It seems that it works when I switch off N mode. But I need to test. Can someone confirm this issue or is there another solution? I have another machine with 12.04 (HP 625 laptop) running where connection is stable.

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• Pulseaudio not detecting bluetooth headset automatically

  - by adityap174

  The Pavucontrol on my Xubuntu 13.10 detects my bluetooth headset, but only after I type the command sudo alsa force-reload After a few seconds the headset appears in the configuration tab. I have also tried inserting the line load-module module-switch-on-connect in the /etc/pulse/default.pa but it doesn't help. I have tried purging and autoremoving and reinstalling everything right from alsa to pulseaudio and pulseaudio-module-bluetooth. Nothing works. Is there a workaround to load the headset without using the command force-reload ? To make the pulseaudio daemon recognize the device automatically ?

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• Instantiate proper class based on some input

  - by Adam Backstrom

  I'm attempting to understand how "switch as a code smell" applies when the proper code path is determined by some observable piece of data. My Webapp object sets an internal "host" object based on the hostname of the current request. Each Host subclass corresponds to one possible hostname and application configuration: WwwHost, ApiHost, etc. What is an OOP way for a host subclass to accept responsibility for a specific hostname, and for Webapp to get an instance of the appropriate subclass? Currently, the hostname check and Host instantiation exists within the Webapp object. I could move the test into a static method within the Host subclasses, but I would still need to explicitly list those subclasses in Webapp unless I restructure further. It seems like any solution will require new subclasses to be added to some centralized list.

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• Ubuntu Hangs Suddenly (Dell Latitude E5530)

  - by iFadey

  I recently bought (a month ago) Dell Latitude E5530 which comes pre-installed with Ubuntu 11.10. I removed Ubuntu 11.10 and installed 12.04 LTS right after the purchase. Everything worked out of box but occasionally Ubuntu completely hangs. The screen freezes and I can't even switch to other terminals by pressing (CTRL+ALT+F*). Whenever the screen freezes, CPU fan speed also increases. This is not happening when running particular applications. I mean it can hang without giving any reason or error displayed and while running any application. In short currently I can't able to reproduce system hang myself. I also want to mention that sometimes it never hangs complete day. Here are the specs of my laptop: Processor: Core i7-3520M CPU @ 2.90GHz Memory: 8GB HDD: 500GB, 7200rpm (Model=ST9500423AS) Graphics: Intel HD 4000 Operating System: Ubuntu 12.04 LTS (64-bit) Thanks!

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• Mouse disables on key press, but touchpad doesn't

  - by Dan

  My mouse cursor disables for 1-2 seconds when the keyboard is used. This can make gaming especially difficult. The touchpad is fine; I can use it at the same time as the keyboard. Doing some forum searching, I can see that going to mouse and touchpad touchpad disable touchpad when typing works for the touchpad, but I still have the problem when using the mouse. I've tried using synaptiks, and setting the 'automatically switch off touchpad on keyboard activity' time to 0 seconds doesn't seem to work either. I'd appreciate any help.

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• How to manage two video cards on a laptop (ATI and Intel)?

  - by Marc-François Cochaux-Laberge

  I have a laptop with two video cards. One ATI and on integrated Intel. On Windows, I can choose which video card I want to use. For example, I use the Intel card for normal use and for gaming, I switch to my ATI card for better performance, but a shorter battery life. In Ubuntu 10.10, only the Intel driver is installed, the ATI driver for my card doesn't work at all and there's heat coming out of my computer all the time, like when I'm playing video games on Windows. I think both cards are active, but only the Intel one is usefull. How can I solve this by making sure Ubuntu is aware of the two video cards and by disabling my ATI. Or may be I am all wrong about this?

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• 5 Reasons to Upgrade to WebLogic Server 11g

  - by ruma.sanyal

  Do you want to optimize your middleware performance and manageability? Are you looking to modernize your IT infrastructure and lower your total cost of ownership? Don't miss this upcoming Webcast to learn five reasons why you should switch to Oracle WebLogic Server 11g. Mike Lehmann, Senior Director of Product Management for Oracle WebLogic Server, will share best practices and helpful tips for a fast, low-risk upgrade. You will also learn how your company can leverage the optimal support, rich capabilities, and extensive options in Oracle WebLogic Server 11g to: Diagnose and fix performance issues Improve data center utilization and density Shorten application release cycles Run applications in a shared services infrastructure Manage heterogeneous infrastructures Register for this complimentary Webcast.

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• Ask the Readers: The Two-Step Login Verification Process – Security Boost or Just Another Hassle?

  - by Asian Angel

  Google recently introduced a new optional two-step login verification process for Google accounts to help increase account security. What we would like to know this week is if you think this will really help improve account security, should be implemented by others in addition to Google, or would simply add a new layer of hassle to using your accounts Latest Features How-To Geek ETC How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Here’s a Super Simple Trick to Defeating Fake Anti-Virus Malware How to Change the Default Application for Android Tasks Stop Believing TV’s Lies: The Real Truth About "Enhancing" Images The Legend of Zelda – 1980s High School Style [Video] Suspended Sentence is a Free Cross-Platform Point and Click Game Build a Batman-Style Hidden Bust Switch Make Your Clock Creates a Custom Clock for your Android Homescreen Download the Anime Angels Theme for Windows 7 CyanogenMod Updates; Rolls out Android 2.3 to the Less Fortunate

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• WIFI card intel r 2200 will not work

  - by Telemarkhero

  I have installed 12.04 on a Fujitsu Siemens Amilo Pro. Wifi card does not work. Have tried various threads but none have the same problem. Think I have the correct firmware but the following comes up: gill@ubuntu:~$ iwconfig lo no wireless extensions. eth1 IEEE 802.11bg ESSID:off/any Mode:Managed Channel:0 Access Point: Not-Associated Bit Rate:0 kb/s Tx-Power=off Sensitivity=8/0 Retry limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 eth0 no wireless extensions. Also gill@ubuntu:~$ rfkill list all 0: phy0: Wireless LAN Soft blocked: no Hard blocked: yes There is a power switch for wifi but it does not do anything in Ubuntu. Any pointers greatfully received.

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• Are there any tweaks for fixing the appearance of Eclipse Juno on ubuntu?

  - by agnul

  As we have previously established ;-) running Eclipse on ubuntu is a bit disappointing on the UI side. Things are even worse now that Juno is out. Are there any tweaks specific to Gtk3 and Juno that help make things better? The new UI maybe needs some getting used to, but I'm not convinced. Padding got much worse with all the extra (useless?) space between panes. The gradient on the toolbar looks ugly, the quick search looks like it needs some more polish, the buttons to switch perspectives maybe would look nicer without the quick search bar, tabs are waaay to big. Not sure the color scheme has been fixed since I'm running a modified theme for the sake of old 3.7 (the infamous white on black tooltips)

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• How can i install XFCE along side unity?

  - by James

  I would like to be able to install XFCE to run alongside unity so I can choose on startup which DE I use, without breaking any features of either DE. Following this: https://sites.google.com/site/easylinuxtipsproject/xubuntu "Note: don't install Nautilus in Xubuntu! This will cause system conflicts." I don't want to affect ANY of the features in unity, i.e. I want to be able to use the two interchangeably, so I can't follow some suggestions of just cleaning out all the old stuff as that would mean using unity would be changed, (http://askubuntu.com/questions/111400/can-i-install-unity-aside-with-xfce-and-switch-them-as-i-want) is this possible in 12.04? [System] ubuntu 12.04.1 64bit.

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