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Articles indexed in September 2012

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WiFi, No ping, other works fine

- by Linux Mom

I installed Ubuntu 12.04 LTS for my mom, this runs OK. However recently, I switched back and forth between encryptions on our WiFi Router from WPA-PSK to WEP and back again to WPA-PSK, same password. Now this old laptop won't even ping the gateway on the router, although the nm-applet shows connected. I tried re-adding the network and putting in the BSSID. I did this over again sometimes just to verify. I tried with my 3G Tethering on my phone, it works fine, can go online too. My other Linux laptop can go on the same wifi as well as my phone. And this laptop used to been online on the same network, same password, same encryption (WPA-PSK) What can be wrong ? Does it need a serious kick in the butt or removing some cached authorisation somewhere?

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Pantech Link II, Ubuntu and Virtual XP

- by user85041

Okay this is my problem. I have a Pantech Link II, dmesg states: [ 896.072037] usb 2-3: new high-speed USB device number 3 using ehci_hcd [ 896.258562] cdc_acm 2-3:1.0: ttyACM0: USB ACM device [ 896.260039] usbcore: registered new interface driver cdc_acm [ 896.260042] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters Have it installed through wine (pc suite and driver) and it doesn't see it. Virtual XP through VMWare Player sees my device, knows it needs a driver. The removable devices says Curitel Pantech USB Device (Maybe Driver). I have PC Suite installed in XP, I install the driver through the executable.. it says problem with installing hardware, and then it disappears. Ubuntu sees it after restart, but if I start XP with that driver installed, it disappears from both and I get these errors in dmesg: [ 1047.760555] /dev/vmmon[2882]: PTSC: initialized at 3093322000 Hz using TSC, TSCs are synchronized. [ 1048.174033] /dev/vmmon[2882]: Monitor IPI vector: 0 [ 1055.293060] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1055.293074] /dev/vmnet: port on hub 8 successfully opened [ 1055.293088] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1055.293094] /dev/vmnet: port on hub 8 successfully opened [ 1072.446305] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1072.446316] /dev/vmnet: port on hub 8 successfully opened [ 1072.446328] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1072.446334] /dev/vmnet: port on hub 8 successfully opened [ 1072.856024] usb 1-1: reset high-speed USB device number 2 using ehci_hcd [ 1079.292024] usb 1-1: reset high-speed USB device number 2 using ehci_hcd [ 1079.732024] usb 1-1: reset high-speed USB device number 2 using ehci_hcd [ 1127.743034] NET: Registered protocol family 39 [ 1127.749320] [3163]: VMCI: IOCTL_VMCI_QUEUEPAIR_ALLOC (cid=1522210225,result=4). [ 1144.104031] usb 2-3: reset high-speed USB device number 3 using ehci_hcd [ 1144.412031] usb 2-3: reset high-speed USB device number 3 using ehci_hcd [ 1155.889976] ehci_hcd 0000:00:13.2: force halt; handshake ffffc90000642024 00004000 00000000 -> -110 [ 1155.889980] ehci_hcd 0000:00:13.2: HC died; cleaning up [ 1155.890008] usb 2-3: USB disconnect, device number 3 [ 1155.890013] usb 2-3: usbfs: usb_submit_urb returned -110 [ 1658.310777] [3163]: VMCI: IOCTL_VMCI_QUEUEPAIR_DETACH (cid=1522210225,result=3). [ 1658.392018] NET: Unregistered protocol family 39 [ 1666.546438] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1666.546450] /dev/vmnet: port on hub 8 successfully opened [ 1666.546462] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1666.546467] /dev/vmnet: port on hub 8 successfully opened [ 1671.431383] uvcvideo: Found UVC 1.00 device USB2.0 Camera (1871:0101) [ 1671.432533] input: USB2.0 Camera as /devices/pci0000:00/0000:00:12.2/usb1/1-1/1-1:1.0/input/input13 lessa@X:~$ dmesg|tail [ 1155.890008] usb 2-3: USB disconnect, device number 3 [ 1155.890013] usb 2-3: usbfs: usb_submit_urb returned -110 [ 1658.310777] [3163]: VMCI: IOCTL_VMCI_QUEUEPAIR_DETACH (cid=1522210225,result=3). [ 1658.392018] NET: Unregistered protocol family 39 [ 1666.546438] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1666.546450] /dev/vmnet: port on hub 8 successfully opened [ 1666.546462] /dev/vmnet: open called by PID 3163 (vmx-vcpu-0) [ 1666.546467] /dev/vmnet: port on hub 8 successfully opened [ 1671.431383] uvcvideo: Found UVC 1.00 device USB2.0 Camera (1871:0101) [ 1671.432533] input: USB2.0 Camera as /devices/pci0000:00/0000:00:12.2/usb1/1-1/1-1:1.0/input/input13 I have tried uninstalling, and installing manually from the device manager update driver while it's still has the warning sign.. it doesn't see the drivers as valid. No idea how to fix this.. would prefer to not have to go to another computer. I'm not trying to do anything but get the pictures off of it. I have to restart ubuntu, plug in device, for ubuntu to see it correctly again. I am like a month and a half old linux newbie so I have no idea the commands I could use for this, and I don't have a memory card in the phone to mount.

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How to write code that communicates with an accelerator in the real address space (real mode)?

- by ysap

This is a preliminary question for the issue, where I was asked to program a host-accelerator program on an embedded system we are building. The system is comprised of (among the standard peripherals) an ARM core and an accelerator processor. Both processors access the system bus via their bus interfaces, and share the same 32-bit global physical memory space. Both share access to the system's DRAM through the system bus. (The computer concept is similar to Beagleboard/raspberry Pie, but with a specialized accelerator added) The accelerator has its own internal memory (SRAM) which is exposed to the system and occupies a portion of the global address space (as opposed to how a graphics card would talk to teh CPU via a "small" aperture in the system memory space). On the ARM core (the host) we plan on running Ubuntu 12.04. The mode of operation of communicating between the processors should be that the host issues memory transactions on the system bus that are targeted at the accelerator internal memory. As far as my understanding goes, if I write a program for the host that simply writes to the physical address of the accelerator, most chances are that the program will crash due to a segmentation violation. So, I assume that I need some way of communicating with the device in real mode. What is the easiest way to achieve this mode of operation?

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Can Ubuntu be installed in a subdirectory of another Linux variant?

- by Reid

I have access to (but not root on) a compute server which is running a Linux distribution that is a few years old. I'd much prefer to use a current Debian-like flavor. Thus, I'm wondering if it is possible to install Ubuntu (or stock Debian) in one of my directories, and use the Ubuntu programs and libraries in preference to what comes with the server. I would need to access arbitrary parts of the server's filesystem, not just the parts under the Ubuntu install. I log in by SSH, so there's no desktop environment needed. But, I would like to be able to use X programs.

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How to eliminate an old Ubuntu partition?

- by GUI Junkie

I installed Ubuntu 12.04 64-bit side by side with my previous 11.10 32-bit. As everything is working correctly, I want to eliminate the old partition. According to update-grub: Found Ubuntu 11.10 (11.10) on /dev/sda1 But according to GParted, /dev/sda1 is the boot partition! So, how can I discover which partition should be the boot partition for 12.04? Can I safely eliminate the /dev/sda1? Also, GParted gives /dev/sda5 as file system unknown, it's 2.93Gib and might be the swap partition (just guessing).

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Problems with mounting .ISO files

- by user89599

I'm using Precise, with GNOME. I've attempted to install some retro, multi-cd games (KOTOR1) via .ISO images and WINE, but I can't get the ISO's to mount correctly. First I tried GMountISO, which showed a read-only warning but worked - until I went to unmount. When the installation program asked for CD 2 I couldn't unmount from the /cdrom folder because neither GMountISO or umount from terminal could detect the mount. After a reboot, I changed to GISOMount (different somehow, I guess?), but when I attempt to mount the ISO I get an error window explaining the syntax of the mount command and, which is also what I get when I attempt to use mount from terminal. After checking /media from terminal on a lark I see the disc mounted there twice over, but umount won't recognize it, even when I specify the full path sudo umount /media/KOTOR_1.iso. It cleared up upon reboot. Can someone please assist? UPDATE :: Thanks for the quick response. What's weird, is the images are like stuck in limbo... I'll show you: sc@sc-HP-110-3700:/media$ ls cdrom KOTOR_1(0)(vcd) KOTOR_1(vcd) sc@sc-HP-110-3700:/media$ cd cdrom sc@sc-HP-110-3700:/media/cdrom$ ls sc@sc-HP-110-3700:/media/cdrom$ cd .. sc@sc-HP-110-3700:/media$ umount KOTOR_1(vcd) bash: syntax error near unexpected token `(' sc@sc-HP-110-3700:/media$ umount KOTOR_1.ISO umount: KOTOR_1.ISO is not mounted (according to mtab) sc@sc-HP-110-3700:/media$ sudo umount -a umount: /run/shm: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) umount: /run: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) umount: /dev: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) umount: /: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) sc@sc-HP-110-3700:/media$

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Ubuntu 12.04 64 bit "unable to find medium with live filesystem" AFTER normal install

- by user88710

So, I got a new computer (64 bit quad core yada yada). pulled my Ubuntu SSD drive from old machine, installed it into new machine. (my intention here is to have Ubuntu installed on the 120G SSD, Win7 on the main drive) downloaded 64 bit Ubuntu, burned it to a disk. rebooted with Live CD, installed Ubuntu to the SSD drive, had no problems rebooted again, got the grub menu, selected Ubuntu after a minute i got this - "unable to find medium with live filesystem" booting into windows, explorer doesnt even see the SSD. Device manager sees it though. I assume this is because its formatted with ext4. so, The liveCD saw the SSD just fine, installed fine, but when i try to boot ubuntu, i get the error above, heeellllpppp! UPDATE: small update. Windows did a software update that apparently wiped out my grub, so I guess grub was installed on the main drive. I reinstalled Ubuntu (again) on the SSD drive but, still no joy with booting from it. same error message as above.

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How to mount an ISO (or NRG) image and rip it as if it were a physical CD?

- by Michael Robinson

I have an ISO (created from an NRG with nrg2iso) backup of a beloved game from my youth: Dark Reign: Rise of the Shadowhand (1998). I with to relive those better times by listening to game's soundtrack. Is there a way for me to mount said ISO in such a way that I can rip the audio tracks into mp3 files? I ask because although I can successfully mount the ISO, ripit / abcde report no cd inserted. How I mounted the ISO: sudo mount -t iso9660 -o loop iso.iso /media/ISO Alternatively is there another way to recover audio from ISO / NRG images? Update: I was able to mount the NRG version of my backup in a way that ripit recognized using gCDEmu. ripit failed to rip, however, barfing on the first track - which is most definitely a data track. Is there a way to make ripit ignore the first track?

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BURG broken by Windows

- by Sallée

I have successfully installed, using Super Boot Manager, BURG in a computer at my work. After I boot into Windows XP, BURG is no longer operational. The machine just boots to the BIOS screen, goes black, and then boots to the BIOS screen again ad infinitum. The only way to recover I have found so far is to use a Boot-Repair USB, which restores either GRUB2 or MBR, not BURG. Everything works fine under GRUB2, but I prefer the improved look of BURG to make things easier on my students.

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How do I make changes to /proc/acpi/wakeup permanent?

- by Jolan

I had a problem with my Ubuntu 12.04 waking up immediately after going into suspend. I solved the problem by changing the settings in /proc/acpi/wakeup, as suggested in this question: How do I prevent immediate wake up from suspend?. After changing the settings, the system goes flawlessly into suspend and stays suspended, but after I wake it back up, the settings in /proc/acpi/wakeup are different from what I set them to. Before going to suspend: cat /proc/acpi/wakeup Device S-state Status Sysfs node SMB0 S4 *disabled pci:0000:00:03.2 PBB0 S4 *disabled pci:0000:00:09.0 HDAC S4 *disabled pci:0000:00:08.0 XVR0 S4 *disabled pci:0000:00:0c.0 XVR1 S4 *disabled P0P5 S4 *disabled P0P6 S4 *disabled pci:0000:00:15.0 GLAN S4 *enabled pci:0000:03:00.0 P0P7 S4 *disabled pci:0000:00:16.0 P0P8 S4 *disabled P0P9 S4 *disabled USB0 S3 *disabled pci:0000:00:04.0 USB2 S3 *disabled pci:0000:00:04.1 US15 S3 *disabled pci:0000:00:06.0 US12 S3 *disabled pci:0000:00:06.1 PWRB S4 *enabled SLPB S4 *enabled I tell the system to suspend, and it works as it should. But later after waking it up, the settings are changed to either: USB0 S3 *disabled pci:0000:00:04.0 USB2 S3 *enabled pci:0000:00:04.1 US15 S3 *disabled pci:0000:00:06.0 US12 S3 *enabled pci:0000:00:06.1 or USB0 S3 *enabled pci:0000:00:04.0 USB2 S3 *enabled pci:0000:00:04.1 US15 S3 *enabled pci:0000:00:06.0 US12 S3 *enabled pci:0000:00:06.1 Any ideas? Thank you for your response. Unfortunately it did not solve my problem. all of /sys/bus/usb/devices/usb1/power/wakeup /sys/bus/usb/devices/usb2/power/wakeup /sys/bus/usb/devices/usb3/power/wakeup /sys/bus/usb/devices/usb4/power/wakeup as well as /sys/bus/usb/devices/3-1/power/wakeup are set to disabled, and the notebook still wakes up by itself right after going to sleep. The only thing it seems to react to are the settings in /proc/acpi/wakeup, which keep changing (resetting) every time i power off/restart my notebook.

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No suspend on lid closing on a Samsung Series 5 14" NP530U4BI

- by dmeu

Ok, i realize I am not the only one, but I will try to provide all info possible to make it exemplary as possible and narrow down the error sources. I have a fresh install of Ubuntu 12.04 and the suspend worked fine upon having it freshly installed but now it does not anymore. The suspend option from the system power button on the top right works fine. Things I did do which I don't know if they are related: Install and remove againthe FGLRX drivers (Radeon graphic card) Install Jupiter power managment (shutting it down is not changin anything) Plug in and out an external display The configuration I know of is well set: In System Settings/Power all is set to suspend when closing lid Double checked with dconf-editor, everything set to suspend So, from here on I don't know how to proceed.. what are common problems that cause this error? EDIT: My computer model is: Samsung Series 5 14" NP530U4BI $ sudo lspci -nn 00:00.0 Host bridge [0600]: Intel Corporation 2nd Generation Core Processor Family DRAM Controller 00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port 00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller 00:16.0 Communication controller [0780]: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 00:1a.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 00:1b.0 Audio device [0403]: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller 00:1c.0 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 00:1c.3 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 00:1c.4 PCI bridge [0604]: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 00:1d.0 USB controller [0c03]: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 00:1f.0 ISA bridge [0601]: Intel Corporation HM65 Express Chipset Family LPC Controller [8086:1c49] (rev 04) 00:1f.2 SATA controller [0106]: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller 00:1f.3 SMBus [0c05]: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller [8086:1c22] (rev 04) 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Thames [Radeon 7500M/7600M Series] 02:00.0 Network controller [0280]: Intel Corporation Centrino Advanced-N 6230 03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller 04:00.0 USB controller [0c03]: ASMedia Technology Inc. ASM1042 SuperSpeed USB Host Controller

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Can't boot without Flash Drive plugged in

- by vlad

(Sorry for my bad English) I had Ubuntu 12.04 Beta installed on my computer. When 12.04 was finally released, I made a bootable USB Flash Drive using Startup Disk Creator. Then I decided to check if this drive works properly and to reinstall the system on my desktop. I must add, my desktop behaves a bit strange when it comes to bootable USB's, it recognizes them as HDD. In BIOS I changed priority of boot so USB Flash Drive (recognized as HDD) was first. Successfully booted, I installed Ubuntu. Everything worked fine, but... Now I cannot boot from my real HDD. Every time I want to boot, I put the USB Flash Drive into my computer, boot, safely remove it and everything works. What have I to do, to repair boot? Thank you for your time!

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Can I instruct the browser not to look for a favicon?

- by Peter Boughton

I have a website that doesn't have/need a favicon. Is there a way to instruct the browser not to waste a request looking for /favicon.ico ? I don't mean filtering logs, but something client-side, like this: <link rel="shortcut icon" href="about:blank" /> That appears to work, but I'm not in a position to do comprehensive tests, (and search engines are being unhelpful). Can anyone confirm if this is a valid method, or provide a suitable alternative?

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Traffic fall after a server problem

- by Sébastien

I have a website from which I analyse the traffic with Google analytics. Day after day the traffic (mainly from Google SE) incresed until I get a problem with my server. For one day the server has been offline and after that I have no longer had as much users as I had before. Now it's like the site is no more referenced on Google index (but when I type "site:mysite.com", I still have all the results). Do you know if this is a normal behaviour and if the traffic will come back as before (the server has had problems two days ago) ?

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Legal Web Fonts & Licensing

- by Phill

So I'm a little confused in regards to legality of using fonts for web. Often from designers I get a PSD file and it uses a special font, and the font is supplied. However attempting to convert the font using: http://www.fontsquirrel.com/fontface/generator Ends up with a message saying it's blocked by Adobe. Not only that sometimes if the font can be converted, it often looks like crap when viewed in a browser. I assume that the generator is primarily for people to convert their own fonts, but if you purchase the use of a font then you can only use it for Web if the terms allows you to? The fonts used in PSD's are often Adobe Fonts, I can't find anything that suggests I can convert those and use them on the web. So I'm wondering if anyone knows the legal rights around using Photoshop supplied fonts on the web? In addition I'm wondering what resources are available (free/paid) that provide fonts that can be used on the web. Free: http://www.fontsquirrel.com http://www.google.com/webfonts Paid: http://www.fontshop.com This is the only one's I've found so far that aren't cartoon type fonts like what's primarily on www.dafont.com

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Send some form info to a PHP page to be processed without going to that page? [closed]

- by zuko

Okay, so I'm not very familiar with php. I have a very simple form, just 2 text fields. All I want to do is, after validating with JavaScript, send these two string fields in an email to a pre-defined email address. I understand how JavaScript works on the client side; you can respond to user events, etc. And PHP is server-side. What I'm having trouble grasping and figuring out is how do I run PHP functions, etc when I want? I figured out how to use the 'action' attribute of the form to send the data via POST to another PHP page. But this simply opens that page. I don't want to open the page I just want to do some processing and send a message back to the page the user is still on. How do I go about something like that? Thanks.

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Sharing one static ip for both ftp and www service

- by user11496

Trying to figure out how to update the Zone record and configure webserver so that one application on the webserver is accessible by public. I'm completely not good at NS/DNS/NAT/firewall/routing/port forwarding/networking etc. "faraday" is the intranet name. Everyone within local network can access all applications hosted on "faraday". Hostname for webserver is "www", FTP server is "ftpserver". Both servers running RHEL4 OS. The goal is to allow anyone outside the company network (public) to access only one of the many applications on "faraday". Hope somebody can help me with some of the questions below, if not all. From zoneedit record, the static IP is used by FTP now. Can I use the same existing static IP - 219.95.10.100, for web service? Currently anyone who enter "http://www.abc.com.my" will be directed to "http://www.abc.com". I don't want this to change. Currently, no one else, except employee on local network, can access "faraday" web pages. How to configure so that when anyone type "http://thisapp.abc.com.my" on their web browser, the url will lead them to "http://faraday/thisapp" (application folder is /var/www/html/thisapp on RHEL4 web server). If possible, how to set the URL will continue to show "http://thisapp.abc.com.my" instead of "http://faraday/thisapp" How to limit/restrict user (those who are not from local network) so they only have access to "http://thisapp.abc.com.my", but not "http://faraday" or "http://faraday/anotherapp", etc. What's the configuration changes needed in /etc/httpd.conf on web server? Company domain name is "abc.com.my". Following is the zone records on www.zoneedit.com. Subdomain Type IP sdsl A 219.95.10.100 ftp CNAME sdsl.abc.com.my @ NS ns3.zoneedit.com @ NS ns7.zoneedit.com WebForward record: New Domain Destination Cloaked www.abc.com.my http://www.abc.com N On my local DNS server, there are 2 zone files: abc.com.my and pnmy.abc.com. > cat abc.com.my.zone ftp CNAME ftp.pnmy.abc.com. sdsl A 219.95.10.100 > cat pnmy.abc.com.zone ftp CNAME ftpserver ftpserver A 172.16.5.1 faraday CNAME www www A 172.16.5.2

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Facebook Share Button and Counter no longer displaying any Count

- by donaldthe

Is it just me or did the Facebook Share button that displays the count of shares and likes just stop working over the past few days? The sharing still works, the count of shares no longer displays. The link that is generated look like this http://www.facebook.com/sharer.php?u= and the JavaScript file on my page is this http://static.ak.fbcdn.net/connect.php/js/FB.Share I haven't changed anything and this has worked for years

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Pathfinding in Warcraft 1

- by Valmond

Dijkstra and A* are all nice and popular but what kind of algorithm was used in Warcraft 1 for pathfinding? I remember that the enemy could get trapped in bowl-like caverns which means there were (most probably) no full-path calculations from "start to end". If I recall correctly, the algorithm could be something like this: A) Move towards enemy until success or hitting a wall B) If blocked by a wall, follow the wall until you can move towards the enemy without being blocked and then do A) But I'd like to know, if someone knows :-)

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My grid based collision detection is slow

- by Fibericon

Something about my implementation of a basic 2x4 grid for collision detection is slow - so slow in fact, that it's actually faster to simply check every bullet from every enemy to see if the BoundingSphere intersects with that of my ship. It becomes noticeably slow when I have approximately 1000 bullets on the screen (36 enemies shooting 3 bullets every .5 seconds). By commenting it out bit by bit, I've determined that the code used to add them to the grid is what's slowest. Here's how I add them to the grid: for (int i = 0; i < enemy[x].gun.NumBullets; i++) { if (enemy[x].gun.bulletList[i].isActive) { enemy[x].gun.bulletList[i].Update(timeDelta); int bulletPosition = 0; if (enemy[x].gun.bulletList[i].position.Y < 0) { bulletPosition = (int)Math.Floor((enemy[x].gun.bulletList[i].position.X + 900) / 450); } else { bulletPosition = (int)Math.Floor((enemy[x].gun.bulletList[i].position.X + 900) / 450) + 4; } GridItem bulletItem = new GridItem(); bulletItem.index = i; bulletItem.type = 5; bulletItem.parentIndex = x; if (bulletPosition > -1 && bulletPosition < 8) { if (!grid[bulletPosition].Contains(bulletItem)) { for (int j = 0; j < grid.Length; j++) { grid[j].Remove(bulletItem); } grid[bulletPosition].Add(bulletItem); } } } } And here's how I check if it collides with the ship: if (ship.isActive && !ship.invincible) { BoundingSphere shipSphere = new BoundingSphere( ship.Position, ship.Model.Meshes[0].BoundingSphere.Radius * 9.0f); for (int i = 0; i < grid.Length; i++) { if (grid[i].Contains(shipItem)) { for (int j = 0; j < grid[i].Count; j++) { //Other collision types omitted else if (grid[i][j].type == 5) { if (enemy[grid[i][j].parentIndex].gun.bulletList[grid[i][j].index].isActive) { BoundingSphere bulletSphere = new BoundingSphere(enemy[grid[i][j].parentIndex].gun.bulletList[grid[i][j].index].position, enemy[grid[i][j].parentIndex].gun.bulletModel.Meshes[0].BoundingSphere.Radius); if (shipSphere.Intersects(bulletSphere)) { ship.health -= enemy[grid[i][j].parentIndex].gun.damage; enemy[grid[i][j].parentIndex].gun.bulletList[grid[i][j].index].isActive = false; grid[i].RemoveAt(j); break; //no need to check other bullets } } else { grid[i].RemoveAt(j); } } What am I doing wrong here? I thought a grid implementation would be faster than checking each one.

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Efficient mapping layout in 2D side-scroller, and collisions between character and the world

- by Jack

I haven't touched Visual Studio for a couple months now, but I was playing a game from the '90s toady and had an epiphany: I was looking for something what i didn't need, and I wasn't using what I knew correctly. One of those realizations was collision, so let me tell you a bit about my project that I was working on. The project's graphics looks like Mario or Dangerous Dave, etc., you get the idea - old-school pixels. So anyway I remember trying to think of something else than AABB for character form, but I couldn't think of anything. Perhaps I could get a suggestion for this? Another thing is the world - I don't want it to be just linear world, I want mountains, etc.. My idea is to use triangles, and no idea yet what to do if I want just part of the cube, say 3/4 or 2/4 or whatever. Hard-coding such things seems inefficient. P.S. I am not looking at the precision level offered by Box2D. Actually I remember trying to implement it at first, but I failed as my understanding of C++ wasn't advanced enough, as it'll be mentioned below. P.P.S. I am programming in C++, and I haven't done it for a couple months now. I have no means of testing it either, as my PC is broken down, and this one can barely run games from late '90s, not to speak about a compiler or a program with inefficient resource management... I am also not an expert (obviously), I don't even know if I can consider myself an average programmer. In short, I am simply curious about my thoughts and my past experience when programming the game. I may come back to it when my PC is fixed, I'm already filling a note about these things.

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Pix for visual studio express 2012 (Desktop)

- by JohnB

(Originally asked on stackoverflow) Using visual c++ express 2010 for direct3d you have to download the directX sdk and there is a tool called pix for debugging shaders, looking at 3d resources etc. With visual studio 2012 express the directx sdk is included in the windows sdk that comes with it but this does not seem to include the winpix.exe tool. Is this very useful tool still available? I guess I can still use the one from the previous sdk but it seems wrong to install the entire sdk just for that tool. Is there a version for VS2012 express that I'm missing?

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graphical interface when using assembly language

- by Hellbent

Im looking to use assembly language to make a great game, not just an average game but a really great game. I want to learn a framework to use in assembly. I know thats not possible without learning the framework in c first. So im thinking of learning sdl in c and then learn, teach myself, how to interpret the program and run it as assembly language code which shouldnt be that hard. Then i will have a window and some graphics routines to display the game while using assembly to code everything in. I need to spend some time learning sdl and then some more time learning how to code all those statements using assembly while calling c functions and knowing what registers returned calls use and what they leave etc. My question is , Is this a good way to go or is there something better to get a graphical window display using assembly language? Regards HellBent

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How to implement the light trails for a tron game?

- by Link

Well I was creating a TRON style game, but had an issue with creating the actual light trails for the game. What I'm doing currently is I have an array the same size as my window in pixel size, implemented like this: int* collision[800][600]; Then when the bike goes on a certain pixel, it is marked with a 1 for traveled on. However what is the most efficient way to create a working light trail display? I tried to do something like this: int i, j; for(i=0; i<800; i++) for(j=0; j<600; j++) if(*collision[i][j] == 1) Image::applySurface(i, j, trailSurface, gameScreen); But it isn't working properly? It just fills the whole screen with a sprite instead. Whats a better/faster/working way to do this?

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How to get distance from point to line with distinction between side of line?

- by tesselode

I'm making a 2d racing game. I'm taking the nice standard approach of having a set of points defining the center of the track and detecting whether the car is off the track by detecting its distance from the nearest point. The nicest way I've found of doing this is using the formula: d = |Am + Bn + C| / sqrt(A^2 + B^2) Unfortunately, to have proper collision resolution, I need to know which side of the line the car is hitting, but I can't do that with this formula because it only returns positive numbers. So my question is: is there a formula that will give me positive or negative numbers based on which side of the line the point is on? Can I just get rid of the absolute value in the formula or do I need to do something else?

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