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• How should I organise classes for a space simulator?

  - by Peteyslatts

  I have pretty much taught myself everything I know about programming, so while I know how to teach myself (books, internet and reading API's), I'm finding that there hasn't been a whole lot in the way of good programming. I am finishing up learning the basics of XNA and I want to create a space simulator to test my knowledge. This isn't a full scale simulator, but just something that covers everything I learned. It's also going to be modular so I can build on it, after I get the basics down. One of the early features I want to implement is AI. And I want to take this into account as I'm designing my classes so I can minimize rewriting code. So my question: How should I design ship classes so that both the player and AI can use them? The only idea I have so far is: Create a ship class that contains stats, models, textures, collision data etc. The player and AI would then have the data for position, rotation, health, etc and would base their status off of the ship stats.

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• Outline Shader Effect for Orthogonal Geometry in XNA

  - by Griffin

  I just recently started learning the art of shading, but I can't give an outline width to 2D, concave geometry when restrained to a single vertex/pixel shader technique (thanks to XNA). the shape I need to give an outline to has smooth, per-vertex coloring, as well as opacity. The outline, which has smooth, per-vertex coloring, variable width, and opacity cannot interfere with the original shape's colors. A pixel depth border detection algorithm won't work because pixel depth isn't a 3.0 semantic. expanding geometry / redrawing won't work because it interferes with the original shape's colors. I'm wondering if I can do something with the stencil/depth buffer outside of the shader functions since I have access to that through the graphics device. But I don't believe I'm able to manipulate actual values. How might I do this?

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• [JOGL] my program is too slow, ho can i profile with Eclipse?

  - by nkint

  hi juys my simple opengl program is really toooo slow and not fluid i'm rendering 30 sphere with simple illumination and simple material. the only hard(?) computing stuffs i do is a collision detection between ray-mouse and spheres (that works ok and i do it only in mouseMoved) i have no thread only animator to move spheres how can i profile my jogl project? or mayebe (most probable..) i have some opengl instruction that i don't understand and make render particular accurate (or back face rendering that i don't need or whatever i don't know exctly i'm just entered in opengl world)

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• exact point oh a rotating sphere

  - by nkint

  I have a sphere that represents the heart textured with real pictures. It's rotating about the x axis, and when user click down it has to show me the exact place he clicked on. For example if he clicked on Singapore and the system should be able to: understand that user clicked on the sphere (OK, I'll do it with unProject) understand where user clicked on the sphere (ray-sphere collision?) and take into account the rotation transform sphere-coordinate to some coordinate system good for some web-api service ask to api (OK, this is the simpler thing for me ;-) some advice?

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• Passing an objects rotation down through its children

  - by MintyAnt

  In my topdown 2d game you have a player with a sword, like an old Zelda game. The sword is a seperate entity, and its collision box "rotates" around the player like an orbit, but always follows the player wherever he goes. The player and sword both have a vector2 heading. The sword is a weapon object that is attached to the character. In order to allow swinging in a direction, I have the following property inside sword (RotateCopy returns a copy of the mHeading after rotation) public Vector2 Heading { get { return mHeading.RotateCopy(mOwner.Rotation); } } This seems a bit messy to me, and slower than it could be. Is there a better way to "translate" the base/owner component rotations through to whatever component I am using, like this sword? Would using a rotation MATRIX be better? (Curretnly rotates by sin/cos) If so, how can I "add" up the matrices? Thank you.

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• Find Nearest Object

  - by ultifinitus

  I have a fairly sizable game engine created, and I'm adding some needed features, such as this, how do I find the nearest object from a list of points? In this case, I could simply use the Pythagorean theorem to find the distance, and check the results. I know I can't simply add x and y, because that's the distance to the object, if you only took right angle turns. However I'm wondering if there's something else I could do? I also have a collision system, where essentially I turn objects into smaller objects on a smaller grid, kind of like a minimap, and only if objects exist in the same gridspace do I check for collisions, I could do the same thing, only make the gridspace larger to check for closeness. (rather than checking every. single. object) however that would take additional setup in my base class and clutter up the already cluttered object. TL;DR Question: Is there something efficient and accurate that I can use to detect which object is closest, based on a list of points and sizes?

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• WinTV-HVR-1900 no picture in VLC

  - by nLinked

  I've connected a Hauppauge WinTV-HVR-1900 to my Ubuntu 10.10 PC and used the instructions here to install the firmware and test that it is detected using dmesg. Detection is successful. The WinTV is connected to my TV using component connections. I run this command to enable the component interface: v4l2-ctl -i 1. Then I use cat /dev/video0 test.mpg, and that file is created and plays perfectly with video and sound. However, when I try to play /dev/video0 in VLC Player (and other players), I just get a black screen. I also try the v4l2-ctl -i 1 command before I try it in VLC, but I still get a black screen, and when I use v4l2-ctl -I, it shows it has connection 0 again (Television), so it reverts back to connection 0 instead of connection 1 (component). So I'm a little stuck with getting VLC to get a picture, even though the CAT command works fine. Anything I can try?

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• QuadTree: store only points, or regions?

  - by alekop

  I am developing a quadtree to keep track of moving objects for collision detection. Each object has a bounding shape, let's say they are all circles. (It's a 2D top-down game) I am unsure whether to store only the position of each object, or the whole bounding shape. If working with points, insertion and subdivision is easy, because objects will never span multiple nodes. On the other hand, a proximity query for an object may miss collisions, because it won't take the objects' dimensions into account. How to calculate the query region when you only have points? If working with regions, how to handle an object that spans multiple nodes? Should it be inserted in the nearest parent node that completely contains it, even if this exceeds the node's capacity? Thanks.

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• My wireless/WiFi connection does not work. What can I do?

  - by Wild Man

  Your situation You have successfully installed Ubuntu. You have just downloaded and booted Ubuntu live media. The latest LTS (see also HWE) or latest non-LTS release are preferred. See the list of Ubuntu releases that are currently supported.) You upgraded your Ubuntu installation to the latest release that the software updater offered you. WiFi worked before, but not now on the new release. You migrated your existing Ubuntu installation to new hardware. Your problem The wireless of your laptop or dekstop is not working. You tried switching the wireless switch off and on and you tried rebooting several times, but you don't see any WiFi access points. You can see your wireless access point, but you cannot establish a connection. You want to analyze the problem, but you don't know where to start or what information you can provide. Related questions I have a hardware detection problem, what logs do I need to look into?

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• Sega lance des jeux vidéos dirigés par les jets d'urine, dont les consoles sont installées dans les urinoirs

  Sega lance des jeux vidéos dirigés par des jets d'urine, dont les consoles sont installées dans les urinoirs Ras-le-bol des jeux vidéos conventionnels ? Pas tenté par les nouvelles consoles à détection de mouvements comme le Kinect ? Sega a pensé à vous. La firme vient en effet de lancer un nouveau concept qui est actuellement testé à Tokio, dans quatre stations de métro. Cette nouvelle console de jeux s'appelle Toylets et, comme son nom l'indique, elle s'utilise dans les urinoirs. Pas de manettes, mais des capteurs de pression mesurant l'intensité du jet de votre urine. Pour diriger votre personnage, modifiez la direction de votre émission de liquide, comme dans le "Vent du Nord&qu...

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• exact point on a rotating sphere

  - by nkint

  I have a sphere that represents the Earth textured with real pictures. It's rotating around the x axis, and when user click down it has to show me the exact place he clicked on. For example if he clicked on Singapore the system should be able to: understand that user clicked on the sphere (OK, I'll do it with unProject) understand where user clicked on the sphere (ray-sphere collision?) and take into account the rotation transform sphere-coordinate to some coordinate system good for some web-api service ask to api (OK, this is the simpler thing for me ;-) some advice?

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• Tips for building an AI for a 2D racing game

  - by declique

  I have a school project to build an AI for a 2D racing game in which it will compete with several other AIs (no collision). We are given a black and white bitmap image of the racing track, we are allowed to choose basic stats for our car (handling, acceleration, max speed and brakes) after we receive the map. The AI connects to the game's server and gives to it several times a second numbers for the current acceleration and steering. The language I chose is C++, by the way. The questions are: What is the best strategy or algorithm (since I want to try and win)? I currently have in mind some ideas found on the net and one or two of my own, but I would like before I start to code that my perspective is one of the best. What good books are there on that matter? What sites should I refer to?

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• How to add a printer in gnome-shell

  - by artfulrobot

  I'm using Gnome Shell (although I'm not sure whether the "Printers" app is part of that or just part of Gnome). I go to "Printers" from the overview, click the + button on the bottom left, choose network and then see a message "FirewallD is not running. Network printer detection needs services mdns, ipp, ipp-client and samba-client enabled on firewall.". It's not auto detected anything. There's an Address box and a Search by Address tickbox, but neither seem to do anything. I'm frustrated because I know all the details of the printer, but have nowhere to put them in. Automation is supposed to make things easier, no? For example I know the printer is at lpd://10.67.5.3/lp1 but I can't put this in anywhere. Is there a GUI that works, or have I misunderstood how to use it?

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• How to implement the setup rules like Clash of Clan?

  - by user25959

  Now I'm already implement the setup build rules which the building could move by unit grid width and height. But the validation detection is poor efficiency. The algorithm cost me 10~12(ms) in average when I move the building. Here is my approach to that: 1.Basic Grid, it is a two dimensional array. Grid[row][column], so that I can save info for each grid. Like whether is it in occupied or excluded. 2.Exclude Space, this is a space which limit same building numbers in space.

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• How do you go about checking your open source libraries for keystroke loggers?

  - by asd

  A random person on the internet told me that a technology was secure(1), safe to use and didn't contain keyloggers because it is open source. While I can trivially detect the key stroke logger in this open source application, what can developers(2) do to protect themselves against rouge committers to open source projects? Doing a back of the envelope threat analysis, if I were a rogue developer, I'd fork a branch on git and promote it's download since it would have twitter support (and a secret key stroke logger). If it was an SVN repo, I'd create just create a new project. Even better would be to put the malicious code in the automatic update routines. (1) I won't mention which because I can only deal with one kind of zealot at a time. (2) Ordinary users are at the mercy of their virus and malware detection software-- it's absurd to expect grandma to read the source of code of their open source word processor's source code to find the keystroke logger.

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• Code snippets in interview

  - by Maddy

  Hi All, Recently I went to an interview for a C development position. Instead of asking me questions, they just gave me 20 code snippets to find out two logical errors on each one. I just couldn't complete all of the 20 since it took me time to go through each of these code snippets. My question is: Is this the right way to judge a candidate? If yes, how can I improve over my error detection skills so that I don't need to waste a lot of time in the next interview? If possible, please, suggest me some links where I could find lots of samples of such questions (mainly in C). Thanks and regards, Maddy

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• No idea of how to simulate car crashes

  - by user2332868

  I have a simple car game with all the basic collision detection and movement in Unity with C#. But when I was building the "engine" for the game I didn't include a detail I later decided to include. I want the possibility so that cars can get damaged and so that the model can change. For example the car looked like it was new and after a crash it looks like a wreck. Please help me by pointing to some resources or by telling me approximate ways of implementing this new feature. Thanks!

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• Detect Open Space in Farseer

  - by Tom G

  I'm working on a 2D platformer using XNA and Farseer. I would like the player's character to be able to grab and climb up ledges. Detecting a collision between the player and the side of a wall is simple enough with the OnCollision delegate, but I have to admit I'm a bit stumped on how to detect that there's enough clearance for the PC to mount the ledge. Essentially, I want to ensure there's an appropriately sized rectangle above and to the left or right of the PC (depending on their direction) and I'm not sure how I would check for such a space. Any suggestions on how to determine there is nothing in the simulated world within some bounding rectangle?

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• Working out of a vertex array for destrucible objects

  - by bobobobo

  I have diamond-shaped polygonal bullets. There are lots of them on the screen. I did not want to create a vertex array for each, so I packed them into a single vertex array and they're all drawn at once. | bullet1.xyz | bullet1.rgb | bullet2.xyz | bullet2.rgb This is great for performance.. there is struct Bullet { vector<Vector3f*> verts ; // pointers into the vertex buffer } ; This works fine, the bullets can move and do collision detection, all while having their data in one place. Except when a bullet "dies" Then you have to clear a slot, and pack all the bullets towards the beginning of the array. Is this a good approach to handling lots of low poly objects? How else would you do it?

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• Mozilla rend son outil de vérification des plug-ins compatible avec les autres navigateurs, pour plu

  Mise à jour du 24.03.2010 par Katleen Mozilla rend son outil de vérification des plug-ins compatible avec les autres navigateurs Après s'être occupé de patcher en urgence son navigateur Firefox suite à la détection d'une faille de sécurité critique, Mozilla travaille sur un outil permettant de sécuriser les navigateurs concurrents. La fondation devrait en effet ce jour rendre disponible une version cross-browser de cette fonctionnalité (qui est embarquée par défaut dans Firefox 3.6), compatible avec Internet Explorer 7 et 8, Chrome 4, Safari 4 et Opera 10.5. Son utilité ? Vérifier si les add-ons importants sont à jour. les hackers profitent souvent de plug-ins périmés pour s'int...

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• Ubuntu Server Installer does not detect usb device

  - by Peter

  For some time now I am struggling with the 12.04 Ubuntu Server installer. I am trying to execute a clean, CD based install with the mentioned version onto an SD card. For the sake of the simplicity I have taken out the HDD. However, I had to recognise that the "disk detection" phase simply can not find the SDCARD. It says "No disk drive was detected. If you know the name of the driver needed by your disk drive, you can select from the list." What is really strange that I have tried the older Ubuntu Server installer (11.04) and this is simply recognising the sdcard... Does anyone have any idea? Many thanks, Peter

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• Efficient way of detecting a touched object in a game?

  - by Pin

  Imagine a Sims-like 2D game for a touch based mobile phone where one can interact with virtually any object in the scene. How can I efficiently detect which object is being touched by the player? In my short experience, looping through all the visible objects in the scene and checking if they're touched has so far done the job, but when there may be many many moving objects in the screen that sounds kind of inefficient isn't it? Keeping the visible moving objects list can consume time in itself as one may have to loop through all of them each frame. Other solutions I've thought are: Spatial hashing. Divide the screen as a grid and place the visible objects in the corresponding bucket. Detection of the clicked object is fast but there's additional overhead for placing the objects in the correct bucket each frame. Maintaining a quad-tree. Moving objects have to be rearranged all the time, the previous solution looks better. What is usually done in this case?

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• Best practices on separating Update and Draw on game loop

  - by Galvanize

  I've been working on my first HTML5 prototype and I found a good model that uses the regular Update and Draw loop we see in game dev. My question is, where does one end and the other begins? The question popped when I wanted to rotate and draw an Image, and I kept wondering if the work of changing the tranformation matrix (that I presume would be a bit expensive since it works on the whole pixel array of an image) and calculating the right position do draw it would characterize drawing work, or maybe not, since after that I may need to check for collision or something similar. Thinkig of it, seems like a silly question, but I would like some advice from more experienced developers. Where does does update ends and draw starts? Thanks in advance.

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• Making a new instantiated prefab as a child for existing GameObject

  - by Akari

  I've been searched about how to make these fruit to move as the basket movement if it collided with it, and I've been found that if I want to perform this I've to let these fruit to be a child to the basket game object .. for example : banana.transform.parent = basket.transform; banana and basket each of them of type "GameObject" ... BUT unfortunately this way didn't work !! and I don't know why ?? So now I need to know if it is possible to destroy the banana if a collision with the basket happened and instantiate a new banana in the basket as a child at run time ?!! I need to try this stupid way because I've tried all the other ways and nothing worked :(

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• How do I implement a selectable world map?

  - by Clay

  I want to have a selectable map of the world, preferably zoomable, in a cocos2d project. When I tap on a country, I want that country to be selected so that I can perform some other operations with it. It seems that the best approach would be to use a vector world map, but I'm unsure how to implement this with cocos2d. Other options include using map tiles, but it seems that still would require the implementation of country polygons for tap/click detection. Depending on user input, I want to add icons to various countries on the map. What is a good way to approach the implementation of this type of map?

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