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• Converting 3 axis vectors to a rotation matrix

  - by user38858

  I am trying to get a rotation matrix (in 3dsmax) from 3 vectors that form an axis (all 3 vectors are aligned by 90 degrees each other) Somewhere I read that I could build a rotation matrix just by inserting in every row one vector at a time (source: http://renderdan.blogspot.cz/2006/05/rotation-matrix-from-axis-vectors.html) So, I built a matrix with these example vectors x-axis : [-0.194624,-0.23715,-0.951778] y-axis : [-0.773012,0.634392,0] z-axis : [-0.6038,-0.735735,0.306788] But for some reason, if I try to convert this matrix to eulerangles, I receive this rotation: (eulerAngles 47.7284 6.12831 36.8263) ... which is totally wrong, and doesn't align to my 3 vectors at all. I know that rotation is quite difficult to understand, may someone shed some light? :)

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• How to change the sprite colors

  - by Mr_Qqn

  In my rhythm game, I have a note object which can be of different colors depending on the note chart. I could use a sprite sheet with all the different color variations I use, but I would prefer to parametrize this. (For information, a note sprite is compound with one main color, for example a red note has only red, light red and dark red.) So, how to change the colors of a sprite basing on a new color ? I'm working with opengl, but any algorithm or math explanation will do. :) Thanks

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• Eight Geektacular Christmas Projects for Your Day Off

  - by Jason Fitzpatrick

  It’s Christmas Eve and if you’re lucky you’ve got some time off ahead of you. Let’s put that time to good use with some holiday-centered geeking out. Come on in for LEGO ornaments, Darth Vader snow flakes, and Christmas light hacks galore. Latest Features How-To Geek ETC How to Use the Avira Rescue CD to Clean Your Infected PC The Complete List of iPad Tips, Tricks, and Tutorials Is Your Desktop Printer More Expensive Than Printing Services? 20 OS X Keyboard Shortcuts You Might Not Know HTG Explains: Which Linux File System Should You Choose? HTG Explains: Why Does Photo Paper Improve Print Quality? An Alternate Star Wars Christmas Special [Video] Sunset in a Tropical Paradise Wallpaper Natural Wood Grain Icons for Your Desktop and App Launcher Docks My Blackberry Is Not Working! The Apple Too?! [Funny Video] Hidden Tracks Your Stolen Mac; Free Until End of January Why the Other Checkout Line Always Moves Faster

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• Fetch as Googlebot works but Submit to Index does not for AJAX urls

  - by Jennifer

  First I fetch as googlebot, then I am prompted to Submit to Index. This I want to do, but the tool just re-prompts me. This does not happen when I am just submitting a standard url. For those urls I get a confirmation that they were submitted to the index. It only occurs when I am submitting a AJAX url. I know the urls are searchable, as I have performed many tests and see the results using /?_escaped_fragment_= Here is an example url: http://www.townbeam.com/#!events Can someone shed some light on this? Thank you

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• What is needed for a networked home printer?

  - by Jay

  I've seen this question: Home network printer recommendations but I think I'm asking something more basic. I'm not really familiar with networked printers or how they work or what they do really. What I'd like is to have a printer that is accessible to anyone connected to my home network, without having to plug into the printer itself. An alternative setup might to be to have a printer that is always hooked up to one computer, like a desktop, that is almost always on and allows other computers connected on the network to print to it as well. I believe the first option is called a networked printer and the second is printer sharing. But again I'm new to this so I don't really know the details or if I'm using the correct terminology. I was wondering if someone might be able to shed some light on this and let me know what is needed for either of these setup. Thanks.

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• Sound Problem due to wrong driver installation

  - by Starx

  First of all, the audio used to play from the speaker but whenever I connected a headphone or speaker in the I, the sound didn't came. So I installed a realtek sound driver to fix this (actually I didn't find any relevant driver for my sound card so I installed it hoping it would show some light) When I rebooted the system, my sound is completely gone and now ubuntu does not detect any sound devices in my system. I clearly installed wrong driver, now I need to remove and go to previous stage and find a correct driver. My laptop is: Dell Studio 1747, uses a speaker Creative Labs Sound X-Fi MB Sound Blaster and the chipset is INTEL PM55. How can I fix this?

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• jWIN JC-AM100 not working

  - by Tony Kilgore

  jWIN JC-AM100 not working in skype, i just see black and the little light that comes on the webcam showing its in use does not come on ether, but it works with cheese but its upside down. =[ lsusb: Bus 002 Device 012: ID 093a:2620 Pixart Imaging, Inc. Bus 002 Device 002: ID 04d9:1702 Holtek Semiconductor, Inc. Bus 002 Device 005: ID 046d:c05a Logitech, Inc. Optical Mouse M90 Bus 002 Device 004: ID 058f:9360 Alcor Micro Corp. 8-in-1 Media Card Reader Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub<

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• Unable to overscan at lower resolution with AMD ATI

  - by Basavaraj

  I am running Ubuntu 12.04 with the latest ATI drivers installed. I have the catalyst option but I am unable to set overscan. My default resolution is 1920*1080 on 15inch display. I want to set it to a lower resolution. But on setting it to any lower resolution the display shrinks i.e I see black chopped off display on the left and on the right :( Really frustrating this, wasted hours on this already. I realized that this is referred to as overscan, but the ATI Catalyst Administrative just does not allow me to set the option. Can someone please through some light on this topic?

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• Looking software for making an animated cartoon to present a new application/scenario idea

  - by Skarab

  I have an idea for an application (+usage scenario) and I would like to create an animated cartoon that shows a use case for this application and its novelty. My company is a rather big so I am looking for an interesting way to get people know my idea to get feedback/get a green light to further develop it. Therefore I am looking for an application (free or commercial) that I could use to realize such an animated cartoon. I have posted this quesion before on stackoverflow, but I think this might be a better community to ask such a question.

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• SilverlightShow for 06-12 Dec 2010

  - by Dave Campbell

  In an effort to get some synergy in the Silverlight community, the SilverlightShow folks and I have decided to share some information. As always, I'm running a bit behind, so I get to post first with the material they provided to me :) Check out the five most popular news at SilverlightShow for last week (06 - 12 Dec 2010). The news that hit the top is the announcement for the upcoming SilverlightShow webinar with Gill Cleeren [which I posted about a couple weeks ago] (check other webinars Gill delivered for SilverlightShow) and the free Telerik license given away to attendees. Michael Crump's digest of Silverlight 5 news announced at Firestarter was the next most attention-grabbing news. Here is SilverlightShow's weekly top 5: Join our next webinar and win a license for Telerik RadControls for Silverlight Silverlight 5 - What's New (Including Screenshots & Code Snippets) Glossy TextBlock Custom Control For Windows Phone WP7 development vs iOS, Android and mobile Web Silverlight Simple Drag And Drop / Or Browse View Model / MVVM File Upload Control Visit and bookmark SilverlightShow... they've got a lot of good things happening over there. Stay in the 'Light

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• How can I pass an array of floats to the fragment shader using textures?

  - by James

  I want to map out a 2D array of depth elements for the fragment shader to use to check depth against to create shadows. I want to be able to copy a float array into the GPU, but using large uniform arrays causes segfaults in openGL so that is not an option. I tried texturing but the best i got was to use GL_DEPTH_COMPONENT glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, 512, 512, 0, GL_DEPTH_COMPONENT, GL_FLOAT, smap); Which doesn't work because that stores depth components (0.0 - 1.0) which I don't want because I have no idea how to calculate them using the depth value produced by the light sources MVP matrix multiplied by the coordinate of each vertex. Is there any way to store and access large 2D arrays of floats in openGL?

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• IKEA Lamps Hacked into Flexible Speaker Mounts

  - by Jason Fitzpatrick

  This simple hack combines the swing arms of two IKEA work lamps with a set of computer speakers for flexible and easily adjustable sound. IKEAHackers reader Bill Dwyer wanted an easy way to get the speakers off his desk but still be able to easily adjust them. By hacking apart two IKEA work lamps (he removed the light assembly and snipped the wires off) he was able to attach his computer speakers to the arms and, in the process, get them off the desk. The arms make it super simple to adjust the speakers exactly where he wants them, including towards other parts of his office/apartment. Hit up the link below to check out more pictures and read Bill’s instructions. Very Flexible Computer Speaker Mounts [IKEAHackers] Use Your Android Phone to Comparison Shop: 4 Scanner Apps Reviewed How to Run Android Apps on Your Desktop the Easy Way HTG Explains: Do You Really Need to Defrag Your PC?

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• [Not in Vermont] IT Jobs: Sharepoint/ASP.NET Dev + Winforms C# Dev in Western Mass

  Two .NET jobs in Western Mass from a recruiter, contact info below Requirement #1: Our client is looking for the best engineers in the world, and then we give them the opportunity to excel. Our light, scrum-based process keeps you focused on delivering functionality that our customers need. We try to do things right (unit tests, continuous builds, bug tracking, etc) and were looking for others who work this way too. Primary Responsibilities Develop SharePoint applications in ASP.NET with a heavy...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Double sides face with two normals

  - by Marnix

  I think this isn't possible, but I just want to check this: Is it possible to create a face in opengl that has two normals? So: I want the inside and outside of some cilinder to be drawn, but I want the lights to do as expected and not calculate it for the normal given. I was trying to do this with backface culling off, so I would have both faces, but the light was wrongly calculated of course. Is this possible, or do I have to draw an inside and an outside? So draw twice?

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• AutoSSH for a robust tunnel

  - by Budric

  I'm trying to start an ssh tunnel from A to B and have it run despite things like: period network/wifi drops on A and remote server reboot on B. My ssh tunnel starts using upstart script on A with event start on (net-device-up IFACE=eth0) I've found autossh which is supposed to handle these kinds of things, but had some trouble getting it to work. The upstart executes: autossh -M 0 -2qTN -o "ServerAliveInterval 30" -o "ServerAliveCountMax 2" -L 5678:somehost:5678 user@B However when I log into B and kill -9 that tunnel session, autossh just exits with "Connection to B closed by remote host." That's not what I expected autossh to do. Any advice on how to set this up? Any GUI service monitoring utilities out there that essentially display a green light if a service is up? Thanks.

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• Facebook Connect with CodeIgniter login problems

  - by Alastair Dewar

  Im having a problem using Facebook Connect on my latest website. Im running it using the CodeIgniter framework and Elliot Haughin's library (http://www.haughin.com/code/facebook/). Everything is setup okay, when the user goes to login, the request is sent to Facebook okay and returns with the code (which i presume identifies the session?). However, it doesnt seem to update the library, and after doing all this still thinks that the user is not logged in. It makes me think its a bug in the library itself, but I can't see anyone else with this problem. I have tried dumping the error log from the library but it doesnt find any problems. If someone could shed any light I would be so grateful!

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• How Stuff Works: Fiber Optic Cables [Science]

  - by Jason Fitzpatrick

  Most people are familiar with the general concept of fiber optic cables–light as a method of data transmission–but how do they really work? Find out in this informative video. Bill Hammack, of Engineer Guy Videos, shows us how fiber optic cables work using–of all things–a bucket and a laser. Check out the above video for a glimpse inside how fiber optic cables work and how your analog voice can go to from your phone’s handset to a digital stream and then back to analog sound for the benefit of your friend on the end of the fiber optic transmission cable. Fiber Optic Cables: How They Work and How Engineers Use Them to Send Messages [YouTube] What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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• Triangle Strips and Tangent Space Normal Mapping

  - by Koarl

  Short: Do triangle strips and Tangent Space Normal mapping go together? According to quite a lot of tutorials on bump mapping, it seems common practice to derive tangent space matrices in a vertex program and transform the light direction vector(s) to tangent space and then pass them on to a fragment program. However, if one was using triangle strips or index buffers, it is a given that the vertex buffer contains vertices that sit at border edges and would thus require more than one normal to derive tangent space matrices to interpolate between in fragment programs. Is there any reasonable way to not have duplicate vertices in your buffer and still use tangent space normal mapping? Which one do you think is better: Having normal and tangent encoded in the assets and just optimize the geometry handling to alleviate the cost of duplicate vertices or using triangle strips and computing normals/tangents completely at run time? Thinking about it, the more reasonable answer seems to be the first one, but why might my professor still be fussing about triangle strips when it seems so obvious?

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• Finding Database issue for iphone app

  - by David Liu

  I know this is a dumb question and it might not be "conceptual" but, as a self-starter I really want to know how to get connected to some sort of "commercial database"? I'm recently designing my local gas station utility app for iphone and ipad. I have absolutely no clue of find a relevant database. For example, if I want to make an app for pizza ordering in the great Chicago area. How do I get info (price, menu, location, etc.) of those pizza stores scattered all over Chicago? Can any one light something for me? I appreciated your help. **If this question is not suitable here please tell me and I will delete this post. Thank you.

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• How long does an ext4 format take?

  - by Bill O'Dwyer

  The USB cable on my Iomega Prestige 1TB hard drive conked out a while back, and I've finally managed to get a new one. I removed the old NTFS file system because I use Windows maybe once a month, and then only for Windows-only activities. So I plug in the HDD to my laptop, and get it to start converting to ext4. Gparted is currently on the "create new ext4 file system" and has been for about 2 hours. Is this right? I know 1TB is fairly large, but the last time I did this, I'm pretty sure it was a fast(er) job.Can anybody shed some light on what's going on here?

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• Ubuntu - Black Screen After Suspend

  - by EssAm

  I used Ubuntu with no problems and I upgraded to 11.10 and everything was fine. But when I did my first suspend I was not able to boot again, all I got was a black screen no bios screen, nothing just blank, I tried doing hard reset but when I power on again same happens. I tried ctrl+alt+delete F1-F12 but i think the keyboard is not working, also tried booting from CD but all I got was blank screen, the hard disk light is not blinking at all so i'm assuming it's not trying to boot. My laptop is Toshiba satellite with ATI Radeon graphics. Hibernate was working fine though. I searched the net for solutions but with no luck. Any ideas?

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• Early Morning Sunrise at the Beach Wallpaper

  - by Asian Angel

  Sunrise [DesktopNexus] Latest Features How-To Geek ETC Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Should You Delete Windows 7 Service Pack Backup Files to Save Space? What Can Super Mario Teach Us About Graphics Technology? Windows 7 Service Pack 1 is Released: But Should You Install It? How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions Add a “Textmate Style” Lightweight Text Editor with Dropbox Syncing to Chrome and Iron Is the Forcefield Really On or Not? [Star Wars Parody Video] Google Updates Picasa Web Albums; Emphasis on Sharing and Showcasing Uwall.tv Turns YouTube into a Video Jukebox Early Morning Sunrise at the Beach Wallpaper Data Networks Visualized via Light Paintings [Video]

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• How much a website like bytes.com earning

  - by robin das

  i am running a website similar to bytes.com (IT QnA site) my site attract 600 unique visitors daily. we are planning our self as bytes.com. Atleast any one can tell me that whether we can earn some serious money with this kind of website. websiteoutlook estimate Daily Pageview - 700636 to bytes.com and its using google ads. Can any one please let me know what kind of earning we can expect for dotcom like bytes.com. Please give some light on this topic as a lot of energy, time and money goes in building this kind of website thanks robin Das

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• How Did we get from CLI to Graphics?

  - by Nathaniel Bennett

  I'm confused when looking into graphics - specifically with operating systems. I mean, how can a computer render a CLI/console along with a GUI. GUI's are completely different from Text. and How Can we have GUI windows that Display Text interfaces, ie how can we have CLI in modern Graphics Operating system - that's what I'm mainly trying to grip on to. How Do Graphic's get rendered to display? is there some sort of memory address that a GPU access which holds all pixel data, and there system's within OS's that Gather the pixel position of Windows and Widgets, along with the Z Index and rasterize them to that memory address, which then the GPU loads to the screen? How About the CLI's integrated with Graphics? how does the OS Tell the GPU that a certain part of the screen wants to display text while the rest, whats to display pixel data? it's all very confusing. Shed some light in it, will ya?

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• Should I be paid for time spent learning a framework?

  - by nate-bit

  To give light to the situation: I am currently one of two programmers working in a small startup software company. Part of my job requires me to learn a Web development framework that I am not currently familiar with. I get paid by the hour. So the question is: Is it wholly ethical to spend multiple hours of the day reading through documentation and tutorials and be paid for this time where I am not actively developing for our product? Or should the bulk of this learning be done at home, or otherwise off hours, to allow for more full-on development of our application during the work day?

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