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• How to make rigid bodies collide with Apex Clothing in PhysX for Maya

  - by b1nary.atr0phy

  According to the [Apex] Clothing Overview section of the documentation: Colliding with Rigid Bodies Rigid bodies present in your scene will push clothing around roughly as you might expect. Well, I beg to differ. The Apex Cloth collides with the floor just fine, but that's about the only thing it collides with (unless I add ragdoll to the same skeleton that the cloth is attached to.) So for example, if I try to bounce a ball (dynamic rigid body) into the cloth, it simply bounces through it. If I try to walk an actor with ragdoll through it, he simply clips through it as well. Anyone have any insight on this?

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• Is there an algorithm for a pool game?

  - by Dmitri

  Hello! I am looking for algorithm to calculate direction and speed of balls in a pool game. I am sure there has to be some type of open source code for this since pool games are some of the oldest computer games I can remember. I mean, when one ball hits another, I need a algorithm to calculate direction of both of them. It will depend of exact angle of where they hit each other and on speed. I want to practice Java coding, so I am looking for java code or package that has this type of code.

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• How to implement Cache in web apps?

  - by Jhonnytunes

  This is really two questions. Im doing a project for the university for storing baseball players statitics, but from baseball data I have to calculate the score by year for the player who is beign displayed. The background is, lets say 10, 000 users hit the player "Alex Rodriguez", the application have to calculate 10, 000 the A-Rod stats by years intead of just read it from some where is temporal saved. Here I go: What is the best method for caching this type of data? Do I have to used the same database, and some temporal values on the same database, or create a Web Service for that? What reading about web caching so you recommend?

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• Google I/O 2010 - Keynote Day 1

  Google I/O 2010 - Keynote Day 1 Google I/O 2010 - Keynote Day 1 Video footage from Day 1 keynote at Google I/O 2010 Vic Gundotra, Engineering Vice President, Google Sundar Pichai, Vice President, Product Management, Google Charles Pritchard, Founder, MugTug Jim Lanzone, CEO, Clicker Mike Shaver, VP Engineering, Mozilla Corporation Håkon Wium Lie, CTO, Opera Software Kevin Lynch, CTO, Adobe Systems Terry McDonell, Editor, Sports Illustrated Group Lars Rasmussen, Manager, Google Wave David Glazer, Engineering Director, Google Paul Maritz, President & CEO, VMware Ben Alex, Senior Staff Engineer, SpringSource Division of VMware, Bruce Johnson, Engineering Director, Google Kevin Gibbs, Software Engineer, Google For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 2 1 ratings Time: 02:05:08 More in Science & Technology

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• Rotate sphere in Javascript / three.js while moving on x/z axes

  - by kaipr

  I have a sphere/ball in three.js which I want to "roll" arround on a x/z axis. For the z axe I could simply do this no matter what the current x and y rotation is: sphere.roll_z = function(distance) { sphere.position.z += distance; sphere.rotation.x += distance > 0 ? 0.05 : -0.05; } But how can I roll it along the x axe? And how could I properly do the roll_z? I've found a lot about quateration and matrixes, but I can't figure out how to use them properly to achieve my (rather simple) goal. I'm aware that I have to update multiple rotations and that I have to calculate how far to rotate the sphere to match the distance, but the "how" is the question. It's probably just lack of mathematical skills which I should train, but a working example/short explanation would help alot to start with.

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• Sprite not rotating around its centre after Scaling at its centre

  - by asma.farhat

  If I scale a sprite at its centre, then try to rotate it around its centre as well, the rotation does not occur around its centre. If you need to rotate, for example a scaled ball,the way its working it is set the scale center at the top left (0,0) set the scale that you want, and then set the rotation center to the middle of the scaled sprite, and then apply the rotation modifier. blaBloBliSprite.setScaleCenter(0, 0); blaBloBliSprite.setScale(0.667f); blaBloBliSprite.setPosition(557, CAMERA_HEIGHT / 2 - blaBloBliSprite.getHeightScaled() / 2); blaBloBliSprite.setRotationCenter(blaBloBliSprite.getWidthScaled() / 2, blaBloBliSprite.getHeightScaled() / 2); But I want to scale a sprite at its centre as well. Is there any way of doing it?

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• libgdx - removing the circle outline rendered on Box2d CircleShape

  - by Brett

  How can I remove the outline on the circleshape below.. CircleShape circle = new CircleShape(); circle.setRadius(1f); ... using ... batch.draw(textureRegion, position.x - 1, position.y - 1, 1f, 1f, 2, 2, 1, 1, angle); I use this to set the body for a Box2d collision but I get a silly circle shape around my texture in libGdx, i.e. my textured sprite (ball) has a circle over the top of it with a line running from center along the radius. Any ideas on how to remove the overlying circle lines?

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• Adding Bzr Launchpad PPA to Ubuntu Hardy

  - by Robery Stackhouse

  I've got TortoiseBazaar installed on my Windows laptop, and I was trying to branch a repository hosted on my VPS to another directory on my VPS, and I got this lovely error: bzr: ERROR: Unknown branch format: 'Bazaar Branch Format 7 (needs bzr 1.6) That lead me to this mailing-list archive: http://osdir.com/ml/bazaar/2009-06/msg00692.html Then I tried following the instructions here to add the Launchpad PPA to /etc/apt/sources.list, but they forgot to mention that you need to do this: sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com D702BF6B8C6C1EFD Which I found out about here after I got this error: GPG error: http://ppa.launchpad.net hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D702BF6B8C6C1EFD after modifying my /etc/apt/sources.list and running: sudo apt-get update Just thought I'd save someone else some pain. And of course, don't forget to uninstall the version of bzr that wouldn't play ball in the first place.

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• How to safely collect bank account from website?

  - by Alexandru Trandafir Catalin

  I want to collect bank account information from my customers on my website. I'd like to do that trough a form, then I will download it to a PC, print it, and then delete it from the website. Or eventually, send it somewhere external right after the user submitted the form so it never gets stored on the website. The goal is to recieve the payment information without having to ask the customer to print, fill manually, and send it over fax. And accomplish this without having to use an external payment gateway. Thank you, Alex.

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• How to customize system preferences settings for all users

  - by user3215

  Does anybody know how to apply a customized user settings to other existing or new users?. Something like a customized preferences settings for system wide so that everybody posses those settings and below will explain in clear what I actually ment. On every machine I will install the following: Eclipse Mysql Query Browser and Admin Mysql Workbench Oracle VirtualBox Thunderbird ----------- ----------- ----------- If I install them by apt, this will automatically create shortcuts in Applications but when I build them from source or extract the tar ball, I will have to add New Item at it's relevant place going to System-->Preferences-->Main Menu to make them available as a shortcuts and this settings are applied only for the account I login and perform them. How could I make this preferences settings for complete system wide which applies for all users? or if there is a way to apply a customized user settings to other users will also be ok. Any hint please? Thank you!

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• Component-based design: handling objects interaction

  - by Milo

  I'm not sure how exactly objects do things to other objects in a component based design. Say I have an Obj class. I do: Obj obj; obj.add(new Position()); obj.add(new Physics()); How could I then have another object not only move the ball but have those physics applied. I'm not looking for implementation details but rather abstractly how objects communicate. In an entity based design, you might just have: obj1.emitForceOn(obj2,5.0,0.0,0.0); Any article or explanation to get a better grasp on a component driven design and how to do basic things would be really helpful.

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• Breakout clone, how to handle/design for collision detection/physics between objects?

  - by Zolomon

  I'm working on a breakout clone, and I wish to create some realistic physics effects for collision - angles on the paddle should allow the ball to bounce, as well as doing curve balls etc. I could use per-pixel based collision detection, but then I thought it might be easier with line/circle intersection testing. So, then I naturally consider making a polygon class for the line-based objects and use the built-in circle class for the circular objects. That sounds like an OK approach, right? And then just check for collision using the specified algorithm based on the objects that might be within each other's range?

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• Kinect office demo ideas

  - by Tedd Hansen

  I'm thinking of placing a Kinect (connected to a PC) in the office and have something fun on it. Just a small thing people can interact with. Basically I get a depthmap (image) and a color image from the Kinect which I can analyze and do stuff with. My limited imagination came up with: Count people passing by. Measure average width of people passing by. Some ball with physics people can play with. Audible alert when someone is walking too fast. Anyone have any good ideas? :)

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• GameplayScreen does not contain a definition for GraphicsDevice

  - by Dave Voyles

  Long story short: I'm trying to intergrate my game with Microsoft's Game State Management. In doing so I've run into some errors, and the latest one is in the title. I'm not able to display my HUD for the reasons listed above. Previously, I had much of my code in my Game.cs class, but the GSM has a bit of it in Game1, and most of what you have drawn for the main screen in your GameplayScreen class, and that is what is causing confusion on my part. I've created an instance of the GameplayScreen class to be used in the HUD class (as you can see below). Before integrating with the GSM however, I created an instance of my Game class, and all worked fine. It seems that I need to define my graphics device somewhere, but I am not sure of where exactly. I've left some code below to help you understand. public class GameStateManagementGame : Microsoft.Xna.Framework.Game { #region Fields GraphicsDeviceManager graphics; ScreenManager screenManager; // Creates a new intance, which is used in the HUD class public static Game Instance; // By preloading any assets used by UI rendering, we avoid framerate glitches // when they suddenly need to be loaded in the middle of a menu transition. static readonly string[] preloadAssets = { "gradient", }; #endregion #region Initialization /// <summary> /// The main game constructor. /// </summary> public GameStateManagementGame() { Content.RootDirectory = "Content"; graphics = new GraphicsDeviceManager(this); graphics.PreferredBackBufferWidth = 1280; graphics.PreferredBackBufferHeight = 720; graphics.IsFullScreen = false; graphics.ApplyChanges(); // Create the screen manager component. screenManager = new ScreenManager(this); Components.Add(screenManager); // Activate the first screens. screenManager.AddScreen(new BackgroundScreen(), null); //screenManager.AddScreen(new MainMenuScreen(), null); screenManager.AddScreen(new PressStartScreen(), null); } namespace Pong { public class HUD { public void Update(GameTime gameTime) { // Used in the Draw method titleSafeRectangle = new Rectangle (GameplayScreen.Instance.GraphicsDevice.Viewport.TitleSafeArea.X, GameplayScreen.Instance.GraphicsDevice.Viewport.TitleSafeArea.Y, GameplayScreen.Instance.GraphicsDevice.Viewport.TitleSafeArea.Width, GameplayScreen.Instance.GraphicsDevice.Viewport.TitleSafeArea.Height); } } } class GameplayScreen : GameScreen { #region Fields ContentManager content; public static GameStates gamestate; private GraphicsDeviceManager graphics; public int screenWidth; public int screenHeight; private Texture2D backgroundTexture; private SpriteBatch spriteBatch; private Menu menu; private SpriteFont arial; private HUD hud; Animation player; // Creates a new intance, which is used in the HUD class public static GameplayScreen Instance; public GameplayScreen() { TransitionOnTime = TimeSpan.FromSeconds(1.5); TransitionOffTime = TimeSpan.FromSeconds(0.5); } protected void Initialize() { lastScored = false; menu = new Menu(); resetTimer = 0; resetTimerInUse = true; ball = new Ball(content, new Vector2(screenWidth, screenHeight)); SetUpMulti(); input = new Input(); hud = new HUD(); // Places the powerup animation inside of the surrounding box // Needs to be cleaned up, instead of using hard pixel values player = new Animation(content.Load<Texture2D>(@"gfx/powerupSpriteSheet"), new Vector2(103, 44), 64, 64, 4, 5); // Used by for the Powerups random = new Random(); vec = new Vector2(100, 50); vec2 = new Vector2(100, 100); promptVec = new Vector2(50, 25); timer = 10000.0f; // Starting value for the cooldown for the powerup timer timerVector = new Vector2(10, 10); //JEP - one time creation of powerup objects playerOnePowerup = new Powerup(); playerOnePowerup.Activated += PowerupActivated; playerOnePowerup.Deactivated += PowerupDeactivated; playerTwoPowerup = new Powerup(); playerTwoPowerup.Activated += PowerupActivated; playerTwoPowerup.Deactivated += PowerupDeactivated; //JEP - moved from events since these only need set once activatedVec = new Vector2(100, 125); deactivatedVec = new Vector2(100, 150); powerupReady = false; }

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• The death of Kodak digital

  - by Ken Hortsch

  Months ago Kodak announced that it was discontinuing its digital video to focus on “significant opportunities for profitable growth”.  Three years ago I picked up the little Kodak Zi6 (pronounced Zix) for the kids for Christmas.  It is an HD pocket video camera with a nice 3” LCD all built into a something a bit longer than an deck of cards.  It is low tech and great!  The kids have had a ball with it, and for around $100 it was perfect.  It comes with 2 AA rechargeable batteries and the recharger.  You can add an SD card, but don’t need to, and the USB is not a cable but a pop-out dongle so everything is right in the one package.  Too many companies look for the next big thing and fail to see the stuff that is good enough, and right in front of their eyes.

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• Smartassembly 5: it lives! Early Access builds now available

  - by Bart Read

  I'm pleased to announce that, late last week, we put out the first early access build for Smartassembly 5, Red Gate's fantastic code protection and error reporting tool, which we acquired last September. You can download it via: http://www.red-gate.com/messageboard/viewforum.php?f=116 It's obviously pretty early days, so please do not try to use this to protect a production application, but we've already done a lot of work in some key areas: We're simplifying and streamlining the licensing model (you won't see this yet, but a lot of the work on this has already been done). We've improved usability of the product, with a better menu, reordering of project settings, and better defaults. We've also fixed a load of bugs, which I'll let Alex blog about in more detail. On a slightly more trivial level, the curly braces are also no more. Over the coming weeks, we'll be adding more improvements, and starting usability tests. If you're interested in getting involved in the latter, please drop an email to [email protected].

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• Split a text file by its entries

  - by Alexx Hardt

  Hi, I'm trying to analyze an enormous text file (1.6GB), whose data lines look like this: 20090118025859 -2.400000 78.100000 1023.200000 0.000000 20090118025900 -2.500000 78.100000 1023.200000 0.000000 20090118025901 -2.400000 78.100000 1023.200000 0.000000 I don't even know how many lines there are. But I'm trying to split the file by date. The left number is a time stamp (these lines are from 2009, January 18th). How can I split this file into pieces according to the date? Everything I know would be to grep file '20090118*' > data20090118.dat , but there sure is a way to do all the dates at once, right? The number of entries per date differ, so using split with a constant number won't work. Thanks in advance, Alex

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• Question about component based design: handling objects interaction

  - by Milo

  I'm not sure how exactly objects do things to other objects in a component based design. Say I have an Obj class. I do: Obj obj; obj.add(new Position()); obj.add(new Physics()); How could I then have another object not only move the ball but have those physics applied. I'm not looking for implementation details but rather abstractly how objects communicate. In an entity based design, you might just have: obj1.emitForceOn(obj2,5.0,0.0,0.0); Any article or explanation to get a better grasp on a component driven design and how to do basic things would be really helpful.

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• GDD-BR 2010 [1H] VC Panel: Entrepreneurship, Incubation and Venture Capital

  GDD-BR 2010 [1H] VC Panel: Entrepreneurship, Incubation and Venture Capital Speakers: Don Dodge, Eric Acher, Humberto Matsuda, Alex Tabor Track: Panels Time slot: H [17:20 - 18:05] Room: 1 Startups can be built and funded anywhere in the world, not just Silicon Valley. Venture Capital investors are investing in startups globally, and funding incubators to hatch their future investments. Find out how you can get into an incubator, or funded by a Venture Capitalist or Angel Investors. Learn from examples in the USA and hear from local VC investors in this panel discussion. Get your questions answered by real investors. From: GoogleDevelopers Views: 6 0 ratings Time: 37:39 More in Science & Technology

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• Are all languages basically the same?

  - by Anirudh

  Recently, i had to understand the design of a small program written in a language i had no idea about (ABAP, if you must know). I could figure it out without too much difficulty. I realize that mastering a new language is a completely different ball game, but purely understanding the intent of code (specifically production standard code, which is not necessarily complex) in any language is straight forward, if you already know a couple of languages (preferably one procedural/OO and one functional). Is this generally true? Are all programming languages made up of similar constructs like loops, conditional statements and message passing between functions? Are there non-esoteric languages that a typical Java/Ruby/Haskell programmer would not be able to make sense of? Do all languages have a common origin?

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• "make" and "make install" never work

  - by Nirmik

  I have been trying it from a long time now and this time it got my nerves... The commands make and make install used to install a program from an extracted tar ball never work for some reason... The make command gives me the error- make: *** No targets specified and no makefile found. Stop. and the make install command gives me the error make: *** No rule to make target `install'. Stop. Why are these commands not executing? What should I do to solve this issue?

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• Why didn't IE8 support border-radius, evil or ignorance?

  - by Mark Rogers

  When I think back to the time of the release of IE7, I was surprised that there wasn't border-radius support. It seems like an obviously great idea to have a css-property name for rounded corners, which can potentially make a site look less like it came from the computer stone-age. Finally, today we have IE9 and Microsoft finally decided to play ball with the rest of the world. But the question remains, why didn't Microsoft bother to support border-radius in IE8? The problem probably became obvious to the company as the growing chorus of complaints from web developers got louder after the release of IE7. Was the company so isolated or in group-think mode that they were blind for that many years? Or did Microsoft have some additional motive to suppress the border-radius property?

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• Adding 'swerve' to a direction

  - by Skoder

  Hey. I'm not much of a maths expert, so this is probably quite straight forward. I was playing a soccer flash game where you take free kicks. You provide Power, Swerve and Direction. I'm reading up on vectors and such so I can use the direction and power information to shoot the ball with the correct velocity. What I don't understand is how the 'Swerve' information is used. What formula connects the Swerve information with the Direction and Power? (This is all in 2D) Thanks for any advice.

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• Design documents as part of Agile

  - by syrion

  At my workplace, we face a challenge in that "agile" too often has meant "vague requirements, bad acceptance criteria, good luck!" We're trying to address that, as a general improvement effort. So, as part of that, I am proposing that we generate design documents that, above and beyond the user story level, accurately reflect the outcome of preliminary investigations of the effect of a given feature within the system and including answers to questions that we have asked the business. Is there an effective standard for this? We currently face a situation where a new feature may impact multiple areas in our "big ball of mud" system, and estimates are starting to climb due to this technical debt. Hopefully more thoughtful design processes can help.

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• Google I/O 2012 - Advanced Design for Engineers

  Google I/O 2012 - Advanced Design for Engineers Alex Faaborg, Christian Robertson Design isn't black magic, it's a field that people can learn. In this talk two elite designers from Google will give you an advanced crash course in interactive and visual design. Topics will include mental models, natural mappings, metaphors, mode errors, visual hierarchies, typography and gestalt principles. Correctly applied this knowledge can drastically improve the quality of your work. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 158 9 ratings Time: 55:50 More in Science & Technology

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