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  • Should I always be checking every neighbor when building voxel meshes?

    - by Raven Dreamer
    I've been playing around with Unity3d, seeing if I can make a voxel-based engine out of it (a la Castle Story, or Minecraft). I've dynamically built a mesh from a volume of cubes, and now I'm looking into reducing the number of vertices built into each mesh, as right now, I'm "rendering" vertices and triangles for cubes that are fully hidden within the larger voxel volume. The simple solution is to check each of the 6 directions for each cube, and only add the face to the mesh if the neighboring voxel in that direction is "empty". Parsing a voxel volume is BigO(N^3), and checking the 6 neighbors keeps it BigO(7*N^3)-BigO(N^3). The one thing this results in is a lot of redundant calls, as the same voxel will be polled up to 7 times, just to build the mesh. My question, then, is: Is there a way to parse a cubic volume (and find which faces have neighbors) with fewer redundant calls? And perhaps more importantly, does it matter (as BigO complexity is the same in both cases)?

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  • How do I handle priority and propagation in an event system?

    - by Peeter
    Lets say I have a simple event system with the following syntax: object = new Object(); object.bind("my_trigger", function() { print "hello"; }); object.bind("my_trigger", function() { print "hello2"; }); object.trigger("my_trigger"); How could I make sure hello2 is printed out first (I do not want my code to depend on which order the events are binded). Ontop of that, how would I prevent my events from propagating (e.g. I want to stop every other event from being executed)

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  • Mysql - innoDb - is in the future! Current system log sequence number

    - by Ward Loockx
    I have this error in my syslog. I restored an older dump to solve this problem, after some reading. Now The errors in syslog are far less than before. But still a few times an hour I get Sep 1 14:23:29 homer mysqld: 120901 14:23:29 InnoDB: Error: page 96637 log sequence number 7 1223357717 Sep 1 14:23:29 homer mysqld: InnoDB: is in the future! Current system log sequence number 6 647303887. Sep 1 14:23:29 homer mysqld: InnoDB: Your database may be corrupt or you may have copied the InnoDB Sep 1 14:23:29 homer mysqld: InnoDB: tablespace but not the InnoDB log files. See Sep 1 14:23:29 homer mysqld: InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-recovery.html Sep 1 14:23:29 homer mysqld: InnoDB: for more information. Sep 1 14:23:29 homer mysqld: 120901 14:23:29 InnoDB: Error: page 96638 log sequence number 8 150027924 Sep 1 14:23:29 homer mysqld: InnoDB: is in the future! Current system log sequence number 6 647303887. Sep 1 14:23:29 homer mysqld: InnoDB: Your database may be corrupt or you may have copied the InnoDB Sep 1 14:23:29 homer mysqld: InnoDB: tablespace but not the InnoDB log files. See Sep 1 14:23:29 homer mysqld: InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-recovery.html Sep 1 14:23:29 homer mysqld: InnoDB: for more information. Sep 1 14:23:29 homer mysqld: 120901 14:23:29 InnoDB: Error: page 96639 log sequence number 7 4208567151 Sep 1 14:23:29 homer mysqld: InnoDB: is in the future! Current system log sequence number 6 647303887. Sep 1 14:23:29 homer mysqld: InnoDB: Your database may be corrupt or you may have copied the InnoDB Sep 1 14:23:29 homer mysqld: InnoDB: tablespace but not the InnoDB log files. See Sep 1 14:23:29 homer mysqld: InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-recovery.html Sep 1 14:23:29 homer mysqld: InnoDB: for more information. Anybody that knows how I can track what database is causing this issue? And how to fix?

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  • Is it convenient to use a XML/JSON generated based system? [closed]

    - by Marcelo de Assis
    One of my clients insists that we missed a requisite for the project(a little social network, using PHP + MySql), is that all queries are made from XML / JSON static files (using AJAX) and not directly from the database. Edit: The main reason, stated by client, is a way to economize bandwith. Even the file loading, has to be using AJAX, to avoid server side processing. We will still use a database to store and insert data. These XML / JSON files will be (re) generated whenever any data is changed by CMS or users. As the project was developed without this "technique", we'll have a lot of work ahead, so I would like to avoid that. I'm asking if it's convenient to use a XML generated based system, because I think a database is already "optimized" and secure to deal with a lot of data traffic. Other issue I'm afraid of, is a chance of conflict when a user is trying to read a XML/JSON which is being just generated.

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  • How can I create a facebook style message system in Rails 3?

    - by Angela
    I am trying to create a basic message system that allows users to send messages to each other and display it in a simple "Inbox" that shows both messages received and sent, as well as the status of read or unread. Ideally I could reuse existing code. But if not, can someone provide a framework to help me do it? I started to use a single Message record that has UserMessage - one for the sender, one for the receiver. That way I could have separate status. But I'm not sure I'm quite doing it right and would like some guidance. Thanks.

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  • Creating a FAT file system and save it into a file in GNU/linux?

    - by RubenT
    I tell you my problem: I want to create a FAT file system and save it into a so I can mount it in linux using something like: sudo mount -t msdos <file> <dest_folder> Maybe I'm wrong and this cannot be done. Anyway, the problem is this: I'm trying to create the file containing a FAT file system, and I'm running this command: sudo mkfs.vfat -F 32 -r 112 -S 512 -v -C "test.fat" 100 That, accordingly to the mkfs man page, will create a FAT32 file system with 112 rootdir entries, logical sector size of 512 bytes, 100 blocks in total, and save it into "test.fat". But it fails, and the bash tells me: mkfs.vfat: unable to create test.fat What is going on? I think I am misunderstanding how mkfs works and how to use it. It is possible to write a filesystem into a file?

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  • Which is faster for read access on EC2; local drive or EBS?

    - by Phillip Oldham
    Which is faster for read access on an EC2 instance; the "local" drive or an attached EBS volume? I have some data that needs to be persisted so have placed this on an EBS volume. I'm using OpenSolaris, so this volume has been attached as a ZFS pool. However, I have a large chunk of EC2 disk space that's going to go unused, so I'm considering re-purposing this as a ZFS cache volume but I don't want to do this if the disk access is going to be slower than that of the EBS volume as it would potentially have a detrimental effect.

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  • Automatic storing package before installing it on .deb based system?

    - by macias
    The reason I am asking this question is I am concerned about simple rollback (I already read how to find out what packages were installed). So I would like to set global (per entire system) option, that forces system to store each package before installing/updating it. With such workflow, I could update whatever I want, and if for example the newest version of Dolphin would be worse than previous one I could simply go to directory with stored packages and install previous version instead (the previous version is either base version -- on ISO -- or version from previous update). Is there such feature as global option to automatically store each package before install? It have to be guaranteed that no package is updated on-fly, i.e. without being stored before. I am learning LMDE, but answer for any .deb based system would be fine -- Ubuntu, Debian, you name it.

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  • I have two versions of glib on my system, and I don't know how to remove the old one

    - by Dameentsia
    While trying to compile a program (pygobject), running ./configure I am told that I don't have glib. So, I download the tarball and compile and install, no problems. now when I try to ./configure the package again, I get the following error: checking for GLIB - version >= 2.24.0... *** 'pkg-config --modversion glib-2.0' returned 2.34.2, but GLIB (2.34.0) *** was found! If pkg-config was correct, then it is best *** to remove the old version of GLib. You may also be able to fix the error *** by modifying your LD_LIBRARY_PATH enviroment variable, or by editing *** /etc/ld.so.conf. Make sure you have run ldconfig if that is *** required on your system. *** If pkg-config was wrong, set the environment variable PKG_CONFIG_PATH *** to point to the correct configuration files no configure: error: maybe you want the pygobject-2-4 branch? Here is the entire prompt: http://pastebin.com/raw.php?i=Gs6MrTWh

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  • Calculating for leap year [migrated]

    - by Bradley Bauer
    I've written this program using Java in Eclipse. I was able to utilize a formula I found that I explained in the commented out section. Using the for loop I can iterate through each month of the year, which I feel good about in that code, it seems clean and smooth to me. Maybe I could give the variables full names to make everything more readable but I'm just using the formula in its basic essence :) Well my problem is it doesn't calculate correctly for years like 2008... Leap Years. I know that if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) then we have a leap year. Maybe if the year is a leap year I need to subtract a certain amount of days from a certain month. Any solutions, or some direction would be great thanks :) package exercises; public class E28 { /* * Display the first days of each month * Enter the year * Enter first day of the year * * h = (q + (26 * (m + 1)) / 10 + k + k/4 + j/4 + 5j) % 7 * * h is the day of the week (0: Saturday, 1: Sunday ......) * q is the day of the month * m is the month (3: March 4: April.... January and Feburary are 13 and 14) * j is the century (year / 100) * k is the year of the century (year %100) * */ public static void main(String[] args) { java.util.Scanner input = new java.util.Scanner(System.in); System.out.print("Enter the year: "); int year = input.nextInt(); int j = year / 100; // Find century for formula int k = year % 100; // Find year of century for formula // Loop iterates 12 times. Guess why. for (int i = 1, m = i; i <= 12; i++) { // Make m = i. So loop processes formula once for each month if (m == 1 || m == 2) m += 12; // Formula requires that Jan and Feb are represented as 13 and 14 else m = i; // if not jan or feb, then set m to i int h = (1 + (26 * (m + 1)) / 10 + k + k/4 + j/4 + 5 * j) % 7; // Formula created by a really smart man somewhere // I let the control variable i steer the direction of the formual's m value String day; if (h == 0) day = "Saturday"; else if (h == 1) day = "Sunday"; else if (h == 2) day = "Monday"; else if (h == 3) day = "Tuesday"; else if (h == 4) day = "Wednesday"; else if (h == 5) day = "Thursday"; else day = "Friday"; switch (m) { case 13: System.out.println("January 1, " + year + " is " + day); break; case 14: System.out.println("Feburary 1, " + year + " is " + day); break; case 3: System.out.println("March 1, " + year + " is " + day); break; case 4: System.out.println("April 1, " + year + " is " + day); break; case 5: System.out.println("May 1, " + year + " is " + day); break; case 6: System.out.println("June 1, " + year + " is " + day); break; case 7: System.out.println("July 1, " + year + " is " + day); break; case 8: System.out.println("August 1, " + year + " is " + day); break; case 9: System.out.println("September 1, " + year + " is " + day); break; case 10: System.out.println("October 1, " + year + " is " + day); break; case 11: System.out.println("November 1, " + year + " is " + day); break; case 12: System.out.println("December 1, " + year + " is " + day); break; } } } }

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  • What will be a good python script (or your favorite language goes here) to test a system's performance and capabilities?

    - by dassouki
    Let's say you're in a computer store looking at 10 laptops, you want to really compare the system's capabilities. What will be an efficient "your fav language goes here" script that will allow you to do this? As an example, when I go to the store I usually open a macbook and a pro's terminal and write an equation in python, iterate it a million or so times, and time them. I like to compare the difference in time. What would be an ideal and simple script that can efficiently compare systems?

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  • Are two database trips reasonable for a login system?

    - by Randolph Potter
    I am designing a login system for a project, and have an issue about it requiring two trips to the database when a user logs in. User types in username and password Database is polled and password hash is retrieved for comparative purposes (first trip) Code tests hash against entered password (and salt), and if verified, resets the session ID New session ID and username are sent back to the database to write a row to the login table, and generate a login ID for that session. EDIT: I am using a random salt. Does this design make sense? Am I missing something? Is my concern about two trips unfounded? Comments and suggestions are welcome.

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  • How to identify cause of system lock on debian squeeze?

    - by David Sanders
    I have a desktop system at work with debian squeeze installed. Every couple days or so, when I come in in the morning, the system appears to be asleep and won't wake up. I suspect it goes into power save mode and then doesn't receive the wake up signal when I click the mouse or touch the keyboard. Does anyone know where I should look in order to start tracking this down? Like log files, etc? I doubt it, but maybe the fact that I'm using a mac aluminum usb keyboard and a wireless usb mouse (that has an off switch) has something to do with it? Maybe, when I turn my mouse off at the end of the day, the system loses track of the device somehow? I dunno :P. Thanks in advance.

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  • A very useful custom component

    - by Kevin Smith
    Whenever I am debugging a problem in WebCenter Content (WCC) I often find it useful to see the contents of the internal data binder used by WCC when executing a service. I want to know the value of all parameters passed in by the caller, either a user in the web GUI or from an application calling the service via RIDC or web services. I also want to the know the value of binder variables calculated by WCC as it processes a service. What defaults has it applied based on configuration settings or profile rules? What values has it derived based on the user input? To help with this I created a  component that uses a java filter to dump out the contents of the internal data binder to the WCC trace file. It dumps the binder contents using the toString() method. You can register this filter code using many different filter hooks to see how the binder is updated as WCC processes the service. By default, it uses the validateStandard filter hook which is useful during a CHECKIN service. It uses the system trace section, so make sure that trace section is enabled before looking for the output from this component. Here is some sample output>system/6    10.09 09:57:40.648    IdcServer-1    filter: postParseDataForServiceRequest, binder start -- system/6    10.09 09:57:40.698    IdcServer-1    *** LocalData *** system/6    10.09 09:57:40.698    IdcServer-1    (10 keys + 0 defaults) system/6    10.09 09:57:40.698    IdcServer-1    ClientEncoding=UTF-8 system/6    10.09 09:57:40.698    IdcServer-1    IdcService=CHECKIN_UNIVERSAL system/6    10.09 09:57:40.698    IdcServer-1    NoHttpHeaders=0 system/6    10.09 09:57:40.698    IdcServer-1    UserDateFormat=iso8601 system/6    10.09 09:57:40.698    IdcServer-1    UserTimeZone=UTC system/6    10.09 09:57:40.698    IdcServer-1    dDocTitle=Check in from RIDC using Framework Folder system/6    10.09 09:57:40.698    IdcServer-1    dDocType=Document system/6    10.09 09:57:40.698    IdcServer-1    dSecurityGroup=Public system/6    10.09 09:57:40.698    IdcServer-1    parentFolderPath=/folder1/folder2 system/6    10.09 09:57:40.698    IdcServer-1    primaryFile=testfile5.bin     system/6    10.09 09:57:40.698    IdcServer-1    ***  RESULT SETS  ***>system/6    10.09 09:57:40.698    IdcServer-1    binder end -------------------------------------------- See the readme included in the component for more details. You can download the component from here.

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  • Simple alternating text in Visual Basic 2008

    - by Josh Grate
    I have a simple completed program, but i would like to add one more feature to it but I'm not sure how. I have it set up to send a message automatically every 7 seconds when a text field is selected, repeating the message of course. What I would like for it to do is alternate between two separate messages, instead just repeating the one. I would like the new program to post at an interval of 12 seconds. Can you help me? Here is my coding. Public Class Form1 Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick SendKeys.Send(TextBox1.Text) SendKeys.Send("{ENTER}") End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Timer1.Enabled = True Timer1.Interval = (TextBox2.Text) End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click Timer1.Enabled = False End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Timer1.Enabled = False End Sub End Class

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  • The cd command using variable to mapped NFS volume within ssh in linux script is not working

    - by Bhavya Maheshwari
    I have to do the following from within a bash script. The /VMNFS/ folder is present on linux box, from where script is run, and is mapped to the machine into which i am ssh'ing, as an NFS at /vmfs/volumes/VMNFS/. The second cd command doesn't work, neither with symbolic path name nor physical pathname. Why? and How to rectify this? #!/bin/bash ssh -2 [email protected] /bin/sh <<\EOF vmfile_path=`grep / vmvar_file` datastore_path=/vmfs/volumes/VMNFS/ cd $datastore_path && echo "The present working directory is" `pwd -P` esxi_vmfile_path_sub=`pwd -P` && echo "variable value is" $esxi_vmfile_path_sub esxi_vmfile_path=`echo $vmfile_path | sed "s:/VMNFS:$esxi_vmfile_path_sub:"` cd "$esxi_vmfile_path" EOF ***Output***: The current working directory is /vmfs/volumes/65335ec4-46d12e41 variable value is /vmfs/volumes/65335ec4-46d12e41 can't cd to /vmfs/volumes/65335ec4-46d12e41/TPAE7.5/

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  • KDE: How can I select audio output device for mplayer?

    - by grimripper
    I recently installed Kubuntu 13.10 64-bit, and I'm having a problem with selecting audio output device. In Phonon, when I select audio device preference order and press Apply, Amarok and Dragon will immediately switch to the preferred device. VLC and SMplayer are not affected. VLC has its own setting for selecting the output device, but SMplayer remains a problem. It always plays audio on internal audio, and I can't change output to HDMI. How can I select HDMI for SMplayer's audio output device? I don't know if it matters, but when I select HDMI audio in Phonon and click Test, the test sound plays on the internal audio output as well. In the hardware settings tab, the front left and front right test buttons play audio on HDMI. Also, volume up/down buttons affect HDMI volume when SMplayer is focused. This would make sense if I could get SMplayer to play audio over HDMI, but it would be better if the volume keys affected SMplayer's own volume, or the "mplayer2: audio stream" which appears in volume control while mplayer is playing. EDIT: I've recompiled mplayer with alsa support, and can now select the audio output device from SMplayer's settings. Didn't affect the issue with Phonon of course, but it's a suitable workaround.

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  • Sound problems in Windows 7

    - by Plastkort
    hi! I hope I reached the correct forum for this question. I have a media computer with a third party audio card (Soundblaster audigy SE) I use a coaxial digital audio cable connected to a Onkyo TX SR508. if I use normal audio, the sound seems very low, I have to set volume atleast to 62 in my amplifier to hear anything, however if I set digital SPDIF I have no means of controlling the audio volume from the PC (only from the amplifier) and this can be nasty if I toggle between movies that uses Digital AC3/THX and movies wihtouth, if I look at movies capable of AC3 the volume gets VERY loud if amp is set to 62, 32 is more than enough volume when using passthrough. so this bothers me is how can I get the same amount of volume with or without digital output? I tried also other soundcards, internal red light Digital audio cable... if I connect to my television I get ok sound on any sound source via HDMI... help :)

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  • Why is the wrong name server information at crsnic.net & gtld-servers.net ?

    - by danorton
    Did I screw this up? I don’t even know how this might have happened, so I’d like to learn. I’m trying out HostGator’s reseller service and I bought a domain name through it, but I didn’t want the default name servers and so I changed them during the registration. After registration the domain name record is correct everywhere except at whois-servers.net and whois.crsnic.net and it looks like the DNS network is using that same information. $ whois -h whois.enom.com. example.com ... Name Servers: dns1.name-services.com dns2.name-services.com dns3.name-services.com dns4.name-services.com dns5.name-services.com ... $ whois -h whois.crsnic.net. example.com Domain Name: EXAMPLE.COM Registrar: ENOM, INC. Whois Server: whois.enom.com Referral URL: http://www.enom.com Name Server: NS1.HOSTGATOR.COM Name Server: NS2.HOSTGATOR.COM Status: clientTransferProhibited Updated Date: 01-jun-2010 Creation Date: 31-may-2010 Expiration Date: 31-may-2011 >>> Last update of whois database: Tue, 01 Jun 2010 19:20:47 UTC <<< ... $ dig +norecurse @b.gtld-servers.net. example.com. NS ... ;; AUTHORITY SECTION: example.com. 172763 IN NS ns2.hostgator.com. example.com. 172763 IN NS ns1.hostgator.com. ... My next step is to let HostGator have a look, but first I want to better understand how this happened. Thanks.

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  • High disk time on sql-server

    - by Patrik
    Hi We have a dedicated sql-server 2008 r2 enterprise edition. The setup is: D: (data files) - stored on local ssd disks (not the same disks as log files) (raid 10) E: (log files) - stored on local ssd disks (not the same disks as data files) (raid 1) F: (transaction log backup) - stored remote on a SAN Today we moved our log files to new disks (from F: to E:). From a shared volume ( F:(SAN)) to dedicated local disks (E:). What then happend was that the "disk time", "avg. transfer time" and "avg disk write queue length" increased on the volume where we have the data files (D:) (not on the volume where the log files are located). The data volume and log volume does not share disks, however they share the same controller card. "Disk idle time" is low for all volumes. One thought is ofcourse that the controller card might be overloaded. But, we need more ideas on where the problem might be.

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  • Compiz runs almost at 100% and the system is slow, what can I do?

    - by Heiner Valverde
    My system became very slow out of the sudden, yesterday Compiz was running extremely smooth, today it started working very slow and slowing the computer. What I've done so far was to resize my swap partition to 6 gigabytes (my computer has 3 gigabytes of RAM), before it was on 5.1 gigabytes, so I though that was the reason of this but still not. Also I tested running only metacity by running metacity --replace and also with Mutter. With metacity works really great no problem but, in the other hand, with mutter the computer works slower than running compiz instead. I am using the Nvidia driver version 173.14.28 and my X Server version as reports the NVidia X Server Settings is the 11.0. My Linux kernel running on this computer is 2.6.35-25-generic and my ubuntu version is 10.10. Any help will be appreciated.

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  • Apply Group Policy to Remote Desktop Services users but not when they log on to their local system

    - by Kevin Murray
    Running Windows Server 2008 Service Pack 2 with Remote Desktop Services role. I want to hide the servers drives using a GPO, but not the users local drives when they are logged on to their local system. Using a GPO, I went to "User Configuration - Policies - Administrative Template - Windows Components - Windows Explorer" and enabled "Hide these specified drives in My Computer" and "Prevent access to drives from My Computer" and in both used "Restrict all drives". Then under "Security Filtering" for the GPO, I restricted it to the system running Remote Desktop Services and the specific users who will be using RDS. I then applied the GPO to our domain and it worked a little too well. Not only was I successful in getting the GPO to work for RDS users, but it also affected those same users at their local systems as well. I've tried everything I can think of, but can't figure out how to apply this just to the RDS but not at their local system. What am I missing?

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  • Why does grub selection no longer appear on my dual-boot system?

    - by ksinkar
    I had installed a Ubuntu 12.04 and Fedora 17 dual boot on my system. During the installation I had installed Ubuntu first and Fedora later. Fedora had recognized Ubuntu and added it to the GRUB OS selection list. Afterwards I installed some routine updates on my Ubuntu and after that I am just not able to see the GRUB OS selection anymore when I boot. I am unable to understand what happened, both Fedora and Ubuntu use GRUB 2.0. Also it seems Ubuntu is not able to recognize other existing linux operating systems; because in the beginning I had installed Fedora first and Ubuntu later, but Ubuntu did not recognize Fedora at all, while Fedora recognized Ubuntu when I installed the other way round.

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