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• Which graphics library should I be using?

  - by DaveDev

  I have been developing and maintaining a WPF application, for which I've recently been tasked with adding a 3D representation of some of the data. I'm new to graphics programming in every kind of way so I'm curious whether I should stick with 3D graphics capabilities built into WPF or should I investigate other solutions, like OpenTK or SharpGL My objective is to represent the data so that it will eventually appear similar to: with nodes connected by lines. I need to rotate the image around each axis and each node will be a 3D model of the device it represents. So far, I've been able to experiment with the tutorial outlined here: Windows Presentation Foundation (WPF) 3D Tutorial and it was helpful as an introduction. But I can see that there are other ways to implement 3D graphics solutions and I wonder if they are more suitable for my needs, or should I stick with the in-built WPF solution? What are the pros and cons of each?

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• reading parameters and files on browser, looking how to execute on server

  - by jbcolmenares

  I have a site done in Rails, which uses javascript to load files and generate forms for the user to input certain information. Those files and parameters are then to be used in a fortran code on the server. When the UI was on the server (using Qt), I would create a parameters file and execute the fortran code using threads so I wouldn't block the computer. Now that is web-based, I need to make the server and browser talk. What's the procedure for that? where should I start looking? I'm already using rails + javascript. I need that extra tool to do the talking, and no idea where to start.

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• Setting Default Ubuntu eth port

  - by No1_Melman

  Background: I have a desktop computer running Ubuntu 12.04. I have installed DRBL to handle DHCP server and Clonezilla Server. I have a network card in my desktop with 2 ports in it. These 2 ports are bonded together and are used by DRBL. There is a 3rd port integrated in the motherboard. I want to use this 3rd port for internet. DRBL knows that this is set for internet. Ubuntu Network-Manager has stopped recognising the connections (device not managed). It use to say that eth1 was default (first port in the network card) I want eth0 to be default as that is the Internet port. Question: How do I make network-manager see eth0 as the defualt port?

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• re-partition new drive and use new partition as 'home'

  - by vector

  Linux noob here. I installed Ubuntu 12.04 on a brand new drive (dual boot with windows on another drive) and re-partitioned it afterwards (with gparted off of live cd) like so (sudo fdisk -l) : Device Boot Start End Blocks Id System /dev/sdb1 * 2048 63735807 31866880 83 Linux /dev/sdb2 1448509438 1465147391 8318977 5 Extended Partition 2 does not start on physical sector boundary. /dev/sdb3 63735808 1448507391 692385792 83 Linux /dev/sdb5 1448509440 1465147391 8318976 82 Linux swap / Solaris I'd like to use sdb3 as default home for all work and fun related program installs and files, but I haven't even gotten as far as changing permissions on it. Any help will be most appreciated.

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• ERROR while getting interface

  - by user284391

  I have installed the latest version of aircrack-ng, but when i run this code, sudo airmon-ng start wlan0 I get this. sudo airmon-ng start wlan0 Found 4 processes that could cause trouble. If airodump-ng, aireplay-ng or airtun-ng stops working after a short period of time, you may want to kill (some of) them! -e PID Name 463 avahi-daemon 475 avahi-daemon 683 NetworkManager 756 wpa_supplicant Interface Chipset Driver wlan0 Broadcom wl - [phy0]mon0: ERROR while getting interface flags: No such device (monitor mode enabled on mon0) Is there anyone who could help me get this problem solved please.

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• Usb/vga not recognized anymore

  - by Peter Raeves

  I don't know what happened, but yesterday everything worked fine, but when I woke up this morning and booted my computer to Ubuntu 14.04 a bunch of hardware isn't recognized anymore. I use a dual monitor setup with dvi-d and vga, but the vga screen isn't recognized anymore and the dvi-d monitor is recognized as "Built-in Display" while I'm not on a laptop. Also every device connected through usb isn't recognized anymore either. I have a keyboard with the blue round connector, which still works, so I can still log in though. The computer goes slower than usual and I have no idea what has happened. Can anybody point me in the direction I should start looking, because this is scary! I just checked and both the front and back sound connectors stopped working also :/ Edit: The devices connected through USB are recognized as they all show up using sudo lsusb, Ubuntu just doesn't let me use them anymore.

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• Things to do to port game made for iOS in Unity to Android?

  - by 2600th

  I have just made my first game for iOS and submitted it to app store. I was thinking of porting my game to Android also. I would like to know things one need to do/remember to port game made for iOS in Unity to Android. How to handle different screen resolutions and pixel densities, optimizations required, etc. Any other suggestions and important things you think I should know? EDIT: Also, should I handle builds according to device resolutions or by pixel density?

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• Remote Desktop advice

  - by spoon16

  Coming from Windows, so that is what my expectations are based on. I have a Ubuntu desktop edition instance running as a virtual machine on a server. I would like to use it as my primary open source dev environment but the VNC tools I have used don't seem to be as rich as "Remote Desktop Connection" in Windows. The two things that are missing for me: connecting/logging into a non-console user sessions dynamically resizing the graphical resolution based on the size of the remote desktop window device sharing (USB devices plugged into client shared with remote) Is there an appropriate client that I can run on Windows to connect to my ubuntu dev instance that provides these capabilities?

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• How can I acheive a smooth 2D lighting effect?

  - by Cyral

  I'm making a tile based game in XNA. So currently my lightning looks like this: How can I get it to look like this? Instead of each block having its own tint, it has a smooth overlay. I'm assuming some sort of shader, and to tell it the lighting and blur it some how. But im not an expert with shaders. My current lighting calculates the light, and then passes it to a spritebatch and draws with a color parameter. EDIT: No longer uses spritebatch tint, I was testing and now pass parameters to set the light values. But still looking for a way to smooth it.

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• Disabling eth0 Module on a Macbook Aluminum

  - by user115488

  The Ubuntu page for my device states the following at the bottom (Known Issues) PowerTOP reports that the module for the 10/100/1000 interface wakes the processor 100+x/sec, accounting for 50% of wakeups on an idle system. This dramatically shortens battery life. One potential solution is to unload this module if you only use wireless. I only use wireless, but I could not find instructions to "unload the module". I have a feeling if I try something related to this, but not the same, battery life will not improve and my eth0 won't work. Anyone have a good guide on this?

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• UbuntuStudio 12.04 does not boot after install - no "intrd" image

  - by user72705

  After installing Ubuntu Studio 12.04 from DVD onto the fourth hard disk, it fails to boot, even when explicitly choosing the fourth hard disk as the boot device. I have SUSE 11.2 on the first 2 SCSI disks (which form a RAID) and Studio64 on the 1st IDE disk (that is, the third disk). Looking at the /boot directory on the Ubuntu partition, I see there is no initrd image. Editing the GRUB configuration file to include (hd3,1)/vmlinuz and of course (hd3,1)/initrd should fix the problem. But still GRUB gives a file not found error. This appears to me that, no mkintrd during the booting process (checked with LiveCD) runs like in OpenSUSE. How do I create the initrd to make Ubuntu bootable.

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• Bluetooth issues after Saucy upgrade

  - by charlie

  I upgraded from Raring to Saucy, and now my bluetooth is giving me problems. First, even though I have a bluetooth inbuilt in my laptop, which I prefer to keep off unless I am using it, there is no greyed out bluetooth icon in the notification area. This was present in Quantal, but was missing in Raring too. I was hoping to get this fixed in Saucy. Seems otherwise. Secondly, and more importantly, in saucy when I am turning on my bluetooth, it immediately (or within seconds) turns off automatically, without giving me any time to even make the device visible. Please help!

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• Can't remove c:/ubuntu folder pleas help?

  - by user98978

  hi today i downloaded ubuntu with wubi-installer on my windows 7 machine but after restarting pc and booting in ubuntu installer my pc shuts down while installing because my laptops battery was gone empty i forgot to plug in my adapter so ubunutu fails to install, then i booted in windows 7 to uninstall ubuntu from add/remove programs en reainstall but the uninstaller did not fully remove the files i still have i folder in my c:/ubuntu when i double click on that folder my explorer.exe stops responding and than i need to open the task manager to kill the explorer.exe procces and restart it and right clicking does the same thing i cant do anyting with c:/ubuntu folder to reinstall ubuntu with wubi i have used unlocker1.9 to remove the folder but i get an error saying Error 0x8007045D: The request could not be performed because of an I/O device error HUH ! please help please :( EDIT: Okay i fixed my problem after following this instruction ! i don't understand why you people did not ask me to do this but it's okay i forgive you my poeple LoL !

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• Interface design where functions need to be called in a specific sequence

  - by Vorac

  The task is to configure a piece of hardware within the device, according to some input specification. This should be achieved as follows: 1) Collect the configuration information. This can happen at different times and places. For example, module A and module B can both request (at different times) some resources from my module. Those 'resources' are actually what the configuration is. 2) After it is clear that no more requests are going to be realized, a startup command, giving a summary of the requested resources, needs to be sent to the hardware. 3) Only after that, can (and must) detailed configuration of said resources be done. 4) Also, only after 2), can (and must) routing of selected resources to the declared callers be done. A common cause for bugs, even for me, who wrote the thing, is mistaking this order. What naming conventions, designs or mechanisms can I employ to make the interface usable by someone who sees the code for the first time?

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• Flowchart with subroutine

  - by Jordy

  I am not really sure how to correctly describe my question, so please forgive me if this is a duplicate. I am creating a flowchart for my program where I implement a method. Let's assume I call this method someMethod. The C code could look something like this: bool someMethod(int Foo, int Bar) { foo += 5; bar -= 5; return (foo == bar); } This means that my flowchart will have a subroutine block where I call this function. But how do I correctly show the reader which integers I pass? And when I create the flowchart of "someMethod", I face a similar problem: how do I correctly show the reader that Foo and Bar are passed parameters?

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• What sort of things can cause a whole system to appear to hang for 100s-1000s of milliseconds?

  - by Ogapo

  I am working on a Windows game and while rendering, some computers will experience intermittent pauses ("hitches" for lack of a better term). When profiled they appear in seemingly random places in the code. Eventually I noticed that it wasn't just my process that was affected, but (seemingly) every process on the system. All of the threads in my application hitch at once. The CPU utilization drops during these hitches and it appears as if most processes make no progress. This leads me to believe this may be an Operating System or Driver issue, but it only occurs while playing the game (and only on some systems). What sort of operations might the operating system be doing that would require the kernel to pause all user threads and block. Some kind of I/O? At first I thought of paging but my impression is that would only affect a single process, no? Some systems in use: Windows, DirectX (3d), nVidia cards (unknown if replicates on ATI), using overlapped io for streaming

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• ACPI Events not triggered after booting

  - by user3208188

  I purchased a Convertible (Laptop and Tablet, Ubuntu 14.04 installed) and would like to execute a script when changing from laptop to tablet mode and the other way around. So I created two new files within the /etc/acpi/events folder corresponding to two new scripts in the /etc/acpi folder. Everything works well if I create a new acpid process (e.g "sudo acpid -c /etc/acpi/events -s /var/run/acpid.socket") manually. However, if I do not initiate this process manually the scripts are not executed, even though there is a process running with the same options right after the machine has booted by default. The only difference I can find is the parent pid. If I create the process the parent is "init --user", while the parent of the automatically initiated process is "/sbin/init". Can anyone help me by explaining why this issue happens and how I can avoid to start an acpid process manually every time I boot the device?

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• Can't boot to Ubuntu 11.10 after installation with Windows 7

  - by Tylor

  I just installed Ubuntu 11.10 on a machine with Windows 7 already installed. I want to setup the dualboot environment. I have a block of unallocated disk space at the end of the disk (some blog post suggested to do so). Then I started installing Ubuntu 11.10 on that part of disk. I installed the boot loader to /boot partition and the installation finished successfully. However, after installation, Ubuntu 11.10 doesn't show up on boot menu. Then I searched on Internet and I used EasyBCD to add a grub2 boot to boot menu. After this, the boot entry does show up in the boot menu, however it only boot into some sort of grub console. I tried many times, and it doesn't work. It looks like the boot loader is not properly installed? I only have one 1.5TB disk and the first 800GB is NTFS partition with Windows 7. Does this work?

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• unable to boot from live USB!

  - by ramblinman

  Linux noob here. I was messing around with my new dual-boot (win7 and the latest ubuntu, 12.04 I think?) Long story short, I deleted some partitions that I shouldn't have. When I boot up the machine, I get: error: no such partition. grub rescue _ I know that I could probably fix this by booting from the live USB. But I can't boot from the live USB either! On startup, I can get "boot from drive" options by pressing F12. (This is how I installed Ubuntu in the first place.) But when I select the USB drive, I get this error: error: no such device: [long string of letters and numbers]. grub rescue _ I've searched around for a fix but most threads addressing the first problem suggest booting from live drive. And I can't do that! Any help much appreciated.

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• Are "backwards" terminators for if and case unique to shell scripting?

  - by tomjakubowski

  In bash at least, if and case blocks are closed like this: if some-expr then echo "hello world" fi case $some-var in [1-5]) do-a-thing ;; *) do-another-thing esac as opposed to the more typical close of end or endif/endcase. As far as I know, this rather funny convention is unique to shell scripting and I have never seen such an odd block terminator anywhere else. Sometimes things like this have an origin in another language (like Ruby's elsif coming from Perl), or a strange justification. Does this feature of shell scripting have a story behind it? Is it found in other languages?

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• My laptop does not have sound and the video reproduces it very rapidly. ubuntu 12.04

  - by user48221

  Once my laptop was fallen and the wi-fi broke, lead her to repairing and when they returned me already it had wi-fi again, but I realized that it did not have sound. In sound configuration it could not raise him, to know if it was a problem of the horns I connected a few headphones and neither it was listened. Because of it I knew that it was a problem of the software, and another problem that I saw, it was that the video player was going too rapidly as if it was advancing him. Where it leads her to arranging they say that they did not touch anything of software, alone they repaired the device of the wi-fi. How I can fix it?

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• Is it possible to configure Ubuntu as a software firewall?

  - by user3215

  I have some systems running on Ubuntu in the private IP range 192.168.2.0-255 . These systems are connected to a switch and the switch is connected to the ISP's modem. Neither the switch nor the modem support firewall options. I don't have any firewall device and I'm not willing to individually configure firewalls on all the systems (via gui/iptables). Is it possible to make an Ubuntu system into something like a software firewall, so that all the traffic/packets sent to or from the WAN(internet) would be allowed/denied based on its firewall rules?

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• Log of data transfer and copied from Ubuntu

  - by Gaurav_Java

  Yesterday my friend ask me for some files i told him that take it from my system i don't see . what extra files or data he take from my system . I was thinking is here any application or method which shows what data is copied to which USB (if name available then shows name or otherwise device id ). and what data is beign copied to ubuntu machine . It is some like history of USB and System data . i think this feature is in KDE this will really useful in may ways. it provides real time and monitoring utility to monitor USB mass storage devices activities on any machine .

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• New Java ME JSRs submitted

  - by heathervc

  Two new Java ME related JSRs were submitted to the JCP program office this week and are now available for review. JSR 360, Connected Limited Device Configuration (CLDC) 8, has been submitted by Oracle for JSR Review.  This review period is open until 15 October.  The ME EC will vote on the JSR Approval Ballot 16-29 October. JSR 361 Java ME Embedded Profile, has been submitted by Oracle for JSR Review. This review period is open until 15 October.  The ME EC will vote on the JSR Approval Ballot 16-29 October.

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• How to Remove Soft Blocks Permanently in Ubuntu 12.04 LTS?

  - by BBN

  I am using Ubuntu 12.04 LTS on an Asus Eee PC 1000HA. Since I upgraded to 12.04, I have had problems connecting to wifi. When I fly, I need to disable wifi. When I try to reconnect, the "enable networking" option is no longer available. If I type in the terminal "rfkill list", the following shows up: 0: eeepc-wlan: Wireless LAN Soft blocked: yes Hard blocked: no If I type "rfkill unblock all", "enable networking" will become available and I am able to connect to wifi. How can I permanently remove this annoying Soft Block? I don't want to be typing up two lines of code. Any help would be greatly appreciated.

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