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• How to Fix the “Firefox Is Already Running” Error

  - by Chris Hoffman

  The “Firefox is already running, but is not responding” error has haunted Firefox users for years. You don’t have to restart your computer when you see this error – you can usually fix it with a quick trip to the Task Manager. This error occurs when Firefox is closed but is still running in the background. Firefox is either in the process of closing or is frozen and hasn’t quit properly. In rare situations, there may be a problem with your profile. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Why do you need float/double?

  - by acidzombie24

  I was watching http://www.joelonsoftware.com/items/2011/06/27.html and laughed at Jon Skeet joke about 0.3 not being 0.3. I personally never had problems with floats/decimals/doubles but then I remember I learned 6502 very early and never needed floats in most of my programs. The only time I used it was for graphics and math where inaccurate numbers were ok and the output was for the screen and not to be stored (in a db, file) or dependent on. My question is, where are places were you typically use floats/decimals/double? So I know to watch out for these gotchas. With money I use longs and store values by the cent, for speed of an object in a game I add ints and divide (or bitshift) the value to know if I need to move a pixel or not. (I made object move in the 6502 days, we had no divide nor floats but had shifts). So I was mostly curious.

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• Composite Moon Map Offers Stunning Views of the Lunar Surface [Astronomy]

  - by Jason Fitzpatrick

  Researchers at Arizona State University have stitched together a massive high-resolution map of the moon; seen the moon in astounding detail. Using images fro the Lunar Reconnaissance Orbiter (LRO) they carefully stitch a massive map of the moon with a higher resolution than the public has ever seen before: The WAC has a pixel scale of about 75 meters, and with an average altitude of 50 km, a WAC image swath is 70 km wide across the ground-track. Because the equatorial distance between orbits is about 30 km, there is nearly complete orbit-to-orbit stereo overlap all the way around the Moon, every month. Using digital photogrammetric techniques, a terrain model was computed from this stereo overlap. Hit up the link below to check out the images and the process they used. Lunar Topography as Never Seen Before [via NASA] How to Make the Kindle Fire Silk Browser *Actually* Fast! Amazon’s New Kindle Fire Tablet: the How-To Geek Review HTG Explains: How Hackers Take Over Web Sites with SQL Injection / DDoS

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• Ask the Readers: What’s the First Thing You Do After Installing a New OS?

  - by Jason Fitzpatrick

  You’ve just booted up your new OS for the first time after a fresh install. What’s the first thing you do? Install specific apps? Tweak settings? Bask in the new-computer-smell of an uncluttered OS? Once a week we put a question before the How-To Geek readership to give you all a chance to share your knowledge and tips with your fellow readers. This week we want to hear about your tips and tricks for whipping a new OS installation into shape. Whether you’ve just installed Windows, Mac OS X, or Linux, we’re curious what kind of computer-warming rituals you visit upon your new OS. Sound off in the comments below and then check back in on Friday for the What Your Said roundup.  How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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• How Curiosity Took Its Self Portrait [Video]

  - by Jason Fitzpatrick

  There was enough confusion among the public as to how exactly the Curiosity Rover was able to photograph itself without the camera arm intruding into the photo that NASA released this video detailing the process. For those readers familiar with photograph blending and stitching using multiple photo sources, this should come as no surprise. For the unfamiliar, it’s an interesting look at how dozens of photos can be blended together so effectively that the arm–robotic or otherwise–of the photographer can be taken right out. Hit up the link below to read more about how NASA practiced on Earth for the shot and to see a high-res copy of the actual self portrait. Mars Rover Self-Portrait Shoot Uses Arm Choreography [NASA] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• What is the most efficient way to blur in a shader?

  - by concernedcitizen

  I'm currently working on screen space reflections. I have perfectly reflective mirror-like surfaces working, and I now need to use a blur to make the reflection on surfaces with a low specular gloss value look more diffuse. I'm having difficulty deciding how to apply the blur, though. My first idea was to just sample a lower mip level of the screen rendertarget. However, the rendertarget uses SurfaceFormat.HalfVector4 (for HDR effects), which means XNA won't allow linear filtering. Point filtering looks horrible and really doesn't give the visual cue that I want. I've thought about using some kind of Box/Gaussian blur, but this would not be ideal. I've already thrashed the texture cache in the raymarching phase before the blur even occurs (a worst case reflection could be 32 samples per pixel), and the blur kernel to make the reflections look sufficiently diffuse would be fairly large. Does anyone have any suggestions? I know it's doable, as Photon Workshop achieved the effect in Unity.

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• Sound Waves Visualized with a Chladni Plate and Colored Sand [Video]

  - by Jason Fitzpatrick

  This eye catching demonstration combines a Chladni Plate, four piles of colored sand, and a rubber mallet to great effect–watch as the plate vibrates pattern after pattern into the sand. A Chladni Plate, named after physicist Ernst Chladni, is a steel plate that vibrates when rubbed with a rubber ball-style mallet. Different size balls create different frequencies and each frequency creates a different pattern in the sand placed atop the plate. Watch the video above to see how rubber balls, large and small, change the patterns. [via Neatorama] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Interactive Master Detail Report Just A Few Minutes Away!

  - by kanichiro.nishida

  Oracle BI Publisher 11G have not just made Master Detail report development much easier and quicker, but also made it more interactive and fun without any coding or scripting. I’ve just created a short video that shows how to create such Master Detail report within a few minutes, so please take a look if you’re interested in!     With 11G, now you can create such report only with your browser very quickly and your report audience will be not only able to interact with the report but also able to view it in a pixel-perfect way with many different formats such as PDF, Excel, Word, PPT, etc. Happy Master Detail Reports development and design! Please share any feedback you have with Interactive Viewer and Layout Editor with us!

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• How can I make an object's hitbox rotate with its texture?

  - by Matthew Optional Meehan

  In XNA, when you have a rectangular sprite that doesnt rotate, it's easy to get its four corners to make a hitbox. However, when you do a rotation, the points get moved and I assume there is some kind of math that I can use to aquire them. I am using the four points to draw a rectangle that visually represents the hitboxes. I have seen some per-pixel collision examples, but I can forsee they would be hard to draw a box/'convex hull' around. I have also seen physics like farseer but I'm not sure if there is a quick tutorial to do what I want.

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• Swinging a sword in Xcode with Sprite Kit

  - by jking14

  I'm working on making an RPG in Xcode, and I'm having a major gameplay issue when it comes to having my character swing his sword in a way that is realistic and gameplay compatible. Right now, when the player taps the screen and the sword is in one of the player's hand, it rotates the upright sword 90 degrees. The sword which is a parent of the player floats in front of the player because of a collision issue I'm looking for any advice anyone can give on how to add a sword to the game and have it swing in a way that looks somewhat realistic and can damage enemies that are more than a single pixel away from the player

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• Architecture of interaction modes ("paint tools") for a 3D paint program

  - by Bernhard Kausler

  We are developing a Qt-based application to navigate through and paint on a volume treated as a 3D pixel graphic. The layout of the app consists of three orthogonal slice views on which the user may paint stuff like dots, circles etc. and also erase already painted pixels. Think of a 3D Gimp or MS Paint. How would you design the the architecture for the different interaction modes (i.e. paint tools)? My idea is: use the MVC pattern have a separate controler for every interaction mode install an event filter on all three slice views to collect all incoming user interaction events (mouse, keyboard) redirect the events to the currently active interaction controler I would appreciate critical comments on that idea.

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• Portal Ported to a Graphing Calculator

  - by Jason Fitzpatrick

  It’s not exactly a 3D-rendered GPU-burner, but this calculator-based version of Portal still features the same portal-jumping tricks that delighted players in the original game. Built using Axe Parser, an advanced programming language for graphing calculators, Portal: Prelude is part an experiment in pushing the limits of Axe Parser and part long standing tradition of porting popular video games to graphing calculators. You can read more about Axe Parser and the many games and program projects under development using it here. [via Geeks Are Sexy] How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere

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• Enjoy 1.3 Billion Pixels of Mars Surface Panoramic Photography from the Curiosity Rover

  - by Akemi Iwaya

  Have you been waiting for more awesome photos of Mars’ surface from the Curiosity Rover mission? Then you are definitely going to love this bit of news! NASA and GigaPan have teamed up to create a truly inspiring 1.3 billion pixel panoramic view of Mars that you can ‘zoom around’ and explore at your leisure. There are two websites that you can visit to enjoy this awesome scenery: NASA’s official website with two viewing options…     

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• Save Web Content Directly to Google Drive in Chrome [Extension]

  - by Asian Angel

  Are you looking for a quick and easy way to save images, documents, and more directly to Google Drive while browsing? Then you may want to grab a copy of the ‘Save to Google Drive’ extension for Chrome. Once you have installed the extension it is very easy to start saving all that wonderful web content to your Google Drive account via the Context Menu or the Toolbar Button as seen in the screenshot above. One thing to keep in mind is that the first time you use the extension you will be asked for permission to access your account as seen in the screenshot below. Here is a quick look at the options currently available for the extension… Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Algorithm to reduce a bitmap mask to a list of rectangles?

  - by mos

  Before I go spend an afternoon writing this myself, I thought I'd ask if there was an implementation already available --even just as a reference. The first image is an example of a bitmap mask that I would like to turn into a list of rectangles. A bad algorithm would return every set pixel as a 1x1 rectangle. A good algorithm would look like the second image, where it returns the coordinates of the orange and red rectangles. The fact that the rectangles overlap don't matter, just that there are only two returned. To summarize, the ideal result would be these two rectangles (x, y, w, h): [ { 3, 1, 2, 6 }, { 1, 3, 6, 2 } ]

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• Secure Yourself by Using Two-Step Verification on These 16 Web Services

  - by Chris Hoffman

  Two-factor authentication, also known as 2-step verification, provides additional security for your online accounts. Even if someone discovers your password, they’ll need a special one-time code to log in after you enable two-factor authentication on these services. Notably absent from this list are banks and other financial institutions. It’s a shame that you can use two-factor authentication to protect your in-game currency in an MMORPG, but not the real money in your bank account. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• An Alternate Vision of the Original Mario Movie [Video]

  - by Asian Angel

  In this alternate vision of the original movie, Joe Nicolosi shows us a Mario who is down and out on his luck and has lost his girlfriend to a yuppie, but refuses to give up. Can Mario turn things around? Warning: Video contains language that may be considered inappropriate. “Mario” – SXSW 2011 Film Bumper [via Geeks are Sexy] How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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• Computer-controlled Lights and Music Synced into Christmas Rock Spectacular

  - by Jason Fitzpatrick

  This spectacular computer controlled and synchronized lighting display combines thousands of feet of LED lighting, multiple controllers, and a rock medley to great effect. The above display started life as the personal Christmas light display of Sioux Falls, ND resident Joe Noe. When Noe moved, he donated his display to a local mall in order to preserve the tradition of people stopping by to see it and making donations to the Make-A-Wish foundation. The local mall, Western Mall, expanded the display and added in even more LEDs and controllers. The end result is an impressive display synced to a Christmas rock medley by UK musician Richard Campbell. [via Mashable] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• For normal mapping, why can we not simply add the tangent normal to the surface normal?

  - by sebf

  I am looking at implementing bump mapping (which in all implementations I have seen is really normal mapping), and so far all I have read says that to do this, we create a matrix to convert from world-space to tangent-space, in order to transform the lights and eye direction vectors into tangent space, so that the vectors from the normal map may be used directly in place of those passed through from the vertex shader. What I do not understand though, is why we cannot just use the normalised sum of the sampled-normal vector, and the surface-normal? (assuming we already transform and pass through the surface normal for the existing lighting functions) Take the diagram below; the normal is simply the deviation from the 'reference normal' for any given coordinate system, correct? And transforming the surface normal of a mapped surface from world space to tangent space makes it equivalent to the tangent space 'reference normal', no? If so, why do we transform all lighting vectors into tangent space, instead of simply transforming the sampled tangent once in the pixel shader?

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• How to flip a BC6/BC7 texture?

  - by postgoodism

  I have some code to load DDS image files into OpenGL textures, and I'd like to extend it to support the BC6 and BC7 compressed formats introduced in D3D11. Since DirectX and OpenGL disagree about whether a texture's origin is in the upper-left or lower-left corner, my DDS loader flips each image's pixels along the Y axis before passing the pixels to OpenGL. Flipping compressed textures presents an additional wrinkle: in addition to flipping each row of 4x4-pixel blocks, you also need to flip the pixels within each block. I found code here to flip BC1/BC2/BC3 blocks, and from the block diagrams on MSDN it was easy to adapt the BC3-flipping code to handle BC4 and BC5. The BC6 and BC7 formats look significantly more intimidating, though. Is there a similar bit-twiddling trick to flip these formats, or would I have to fully decompress and recompress each block?

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• Avoid if statements in DirectX 10 shaders?

  - by PolGraphic

  I have heard that if statements should be avoid in shaders, because both parts of the statements will be execute, and than the wrong will be dropped (which harms the performance). It's still a problem in DirectX 10? Somebody told me, that in it only the right branch will be execute. For the illustration I have the code: float y1 = 5; float y2 = 6; float b1 = 2; float b2 = 3; if(x>0.5){ x = 10 * y1 + b1; }else{ x = 10 * y2 + b2; } Is there an other way to make it faster? If so, how do it? Both branches looks similar, the only difference is the values of "constants" (y1, y2, b1, b2 are the same for all pixels in Pixel Shader).

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• OpenGL ES Basic Fragment Shader help with transparency

  - by Chris

  I have just spent my first half hour playing with the shader language. I have modified the basic program I have which renders the texture, to allow me to colour the texture. varying vec2 texCoord; uniform sampler2D texSampler; /* Given the texture coordinates, our pixel shader grabs the corresponding * color from the texture. */ void main() { //gl_FragColor = texture2D(texSampler, texCoord); gl_FragColor = vec4(0,1,0,1)*vec4(texture2D(texSampler,texCoord).xyz,1); } I have noticed how this affects my transparent textures, and I believe I am loosing the alpha channel which would explain why previously transparent area's appear totally black. If I use the following line instead, I am shown the transparent area's gl_FragColor = vec4(0,1,0,1)*vec4(texture2D(texSampler,texCoord).aaa,1); How can I retain the transparency after this modification to the colour? I have seen various things about a .w property, and also luminous, but my tweaks with those and the .aaa property are not working XD

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• Determine percentage of screen covered by an object without using frustum culling

  - by Meltac

  On the CPU-side of an 3D first-person / ego perspective game I need to check whether what the players currently sees on screen is the inside of a box object defined by world space coordinates (the player might be outside of that box but on screen sees only/mostly the inside of the box, or vice-versa, looks from within the box to the outside). The "casual" way of performing such a check would incorporate frustum culling but such an approach would be hard to achieve with my given set of engine parameters which I'd like to avoid if there is a simpler way. What I actually have at the point where I would like to do the check (high-level script on CPU, not GPU side): Camera world position Camera direction Camera FOV Two Box corner world coordinates (left-bottom-front, right-top-back) What I do not have right away: View frustrum definition (near/far plane or say 6 planes defining frustum) Any specific pixel information (uv, view space position, depth or the like) What I would like to calculate: Percentage of screen "covered" by box. Any hints on how to perform such calculation?

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• Artifacts when using SamplerState.LinearClamp in SpriteBatch

  - by Raymond Holmboe

  I'm using XNA 4.0 and VS2010 Express for Windows Phone and Windows Phone SDK 7.1. This is a platform game and I have a map made up of 16x16 textures that is drawn dynamically, tile by tile. When using SpriteBatch to draw my map with LinearClamp, I get artifacts that looks like blurry thin lines. They become visible when the camera moves from one pixel to another and when the camera is still, the artifacts disappear. Here's a small sample of what I mean: Here's how I draw with the spritebatch: SBWorld.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied, SamplerState.LinearClamp, DepthStencilState.Default, RasterizerState.CullNone, null, camera.View); When using SamplerState.PointClamp the game just plays horribly (IMHO), so I cannot use that. Why do these lines appear and how do I get rid of those?

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• 12.04 Dual Monitor Configuration changes to "Mirrored" automatically

  - by Josef

  After installing 12.04 on my Samsung X120 Notebook (with Intel GMA 4500 internal graphics card) i have a Problem with the configuration off my 2nd monitor. Its a 22" with 1680 * 1050 Pixel connected via HDMI. I use the display configuration and set internal display=off and external display=main display. That works fine. After rebooting i still have that configuration, but after a while (often when i press a button on the keyboard), the configuration automatically changes to "Mirror Screen" and the internal display switches on. Both displays then have a bad resolution. When i do the manual display configuration again, everything is fine for the duration of that session. What could be the problem, that this display configuration gets lost / resets?

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