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• Why does my OpenGL ES iPhone game flicker when I first turn on the phone?

  - by MrDatabase

  I made a simple game for the iPhone using OpenGL ES. Everything works fine except for this problem: I turn the phone completely off, then back on, then launch my app and I get this wierd flickering! Every other frame is correct... the incorrect frames are just the same frame over and over again. If I quit the app, launch it again everything is fine. If I quit and restart 10 times in a row everything is fine every time. But if I turn the phone off, then back on, then launch the app I get the same flickering the first time I launch the app. Why is this happening?! Has anyone else had this problem? Cheers!

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• What is the easiest way to create a clickable grid for a game in C++?

  - by mangoman13

  I haven't used C++ in a while, so I decided to take on a small project to become familiar with it again. I am trying to make a chinese checkers game, but I have no experience with GUI design in C++. Is there a real simple way to just make grid (i.e. bitmap hexagons or something) that when clicked on, will give me the index number of the one I've clicked on? If someone has any examples of how to do this, even with just a 2D grid of squares, that would be helpful. Any help is appreciated, thanks!

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• Which language should I learn to create a sudoku game?

  - by Brandan

  I'd like to learn a new programming language, something besides all the scripting languages I've used for the past many years (Ruby, JavaScript, Perl, PHP, bash). I figured it might be interesting to make a sudoku game since there are plenty of documented algorithms and it only requires fairly simple data structures. It might start out as either a generator or a solver of puzzles, not necessarily both and not necessarily with a GUI. My goal is primarily to learn some new programming concepts beyond MVC and UI design, secondarily for this thing to be pretty fast. Is there a language that particularly shines for these sorts of constraint satisfaction problems? Is it suited to a functional language like Haskell or a highly concurrent language like Erlang (say for solving puzzles much larger than 9 x 9)? Or is this question mostly meaningless?

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• Flash CS4/AS3 Writing local file from local game without save dialog prompt?

  - by dragonridingsorceress

  I'm writing a game to be run locally, on the user's computer. NOT over the internet. I want to have a file that will hold the usernames and avatar indices (they're in an array). I want to know if there's a way to write to files through Flash with AS3. I'm using CS4. I'd also like to know if you can delete files through Flash, though that's just optional. Thanks in advance for any help you can give.

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• Is a text file with names/pixel locations something a graphic artist can/should produce? [on hold]

  - by edA-qa mort-ora-y

  I have an artist working on 2D graphics for a game UI. He has no problem producing a screenshot showing all the bits, but we're having some trouble exporting this all into an easy-to-use format. For example, take the game HUD, which is a bunch of elements laid out around the screen. He exports the individual graphics for each one, but how should he communicate the positioning of each of them? My desire is to have a yaml file (or some other simple markup file) that contains the name of each asset and pixel position of that element. For example: fire_icon: pos: 20, 30 fire_bar: pos: 30, 80 Is producing such files a common task of a graphic artist? Is is reasonable to request them to produce such files as part of their graphic work?

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• Significance of Bresenhams Line of Sight algorithm

  - by GamDroid

  What is the significance of Bresenhams Line of Sight algorithm in chasing and evading in games? As far as i know and implemented this algorithm calulates the straight line between two given points. However while implementing it in game development i stored the points calculated using this algorithm in an array.Then im traversing this array for chasing and evading purpose. This looks to be working good with some angles only.In an pixel based environment/tile based. What if there are some obstacles added in the paths of the two points? then this algorithm will not work right? How well can we use the Bresenhams Line algorithm in game development?

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• Collision detection with curves

  - by paldepind

  I'm working on a 2D game in which I would like to do collision detection between a moving circle and some kind of static curves (maybe Bezier curves). Currently my game features only straight lines as the static geometry and I'm doing the collision detection by calculating the distance from the circle to the lines, and projecting the circle out of the line in case the distance is less than the circles radius. How can I do this kind of collision detection in a relative straightforward way? I know for instance that Box2D features collision detection with Bezier curves. I don't need a full featured collision detection mechanism, just something that can do what I've described.

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• Why should I consider using the Source Engine?

  - by dukeofgaming

  I've always been a Valve fan, but now that I have the opportuninty to choose a game engine for a project I'm not sure I want to choose the Source Engine after watching this wikipedia entry. My options essentially boiled down to an open source stack (Horde3D + Zoidcom + Spark + SFML + CEGUI, and well, not OSS but PhysX too), UDK and the Source Engine. My question is (because I really have no experience with it) why should any developer choose the Source Engine over any other open source or commercial option?, is the Source Engine really worth it as a game development tool or has it time already passed and it is obsolete against other solutions?. Thanks

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• Why should I consider using the Source Engine?

  - by dukeofgaming

  I've always been a Valve fan, but now that I have the opportuninty to choose a game engine for a project I'm not sure I want to choose the Source Engine after watching this wikipedia entry. My options essentially boiled down to an open source stack (Horde3D + Zoidcom + Spark + SFML + CEGUI, and well, not OSS but PhysX too), UDK and the Source Engine. My question is (because I really have no experience with it) what would be the technical reasons (not license or other) for any developer to choose the Source Engine over any other open source or commercial option ?, is the Source Engine really worth it as a game development tool or has it time already passed and it is obsolete against other solutions?. Thanks Edit: Precised my question a little more , I'm looking for technical reasons to choose the Source Engine.

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• MonoGame: PC + Mobile?

  - by ashes999

  I'm researching Monogame. Their goal is to allow "easy" porting of an existing XNA/Windows game to mobile. Does this mean you can have one solution (theoretically) with shared code, and it works on all three platforms (PC, Android, iPhone)? Or do you need to port your game from PC to Android, and then again to iPhone? I'm sure "write once, run anywhere" works 80% of the time, I'm not worried about that other 20% like support for GPS, acceleratometer, etc. which doesn't exist on all platforms.

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• 3DS Max MassFX -- Animation to XNA without bones/skins?

  - by AnKoe

  I made a model in which a number of cobble stones fall into a hole using the rigid bodies in 3DS Max 2012 MassFX. They are just editable polys, no skin, no bone. I want this to play (Take 001, 0-100 frames) when the game loads the mesh. I haven't found a way to get to the animation though. Does anyone have suggestions? All the tutorials for animated skinned models don't seem to work with a model set up like this? Do I really need to give each of 145 rocks a bone? If so, does anyone have a suggestion how to streamline that, or if there is an alternate solution to achieving this effect? The animation only needs to play once when the game starts, and that's it. Thanks.

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• A few meta questions about making flash games

  - by idan

  A few questions for a beginner game maker without an artist. Is there a site where flash game creators can download (and use) free art? I don't need character sprites but environments like trees, clouds, platforms, etc. Is there a site where a programmer can collaborate with an artist and a composer? (Even if so, the chances are low for a beginner with no portfolio to find an artist willing to collaborate, right?) Do you have recommended sites for asking action script questions (dedicated solely to flash?) Thanks!

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• Linux multiplayer server, need some help.

  - by Viktor

  I need to write a server for a game, which is closer to action type game, so needs fast communication. There must be only one server, I'll just split the world in zones, but this is not the question. Client will be written in java using jMonkeyEngine. In my opinion I should write the server in java. I don't want to implement any low level features such as communication, reliable udp, etc. Can you suggest any java libraries that already implement this? Or maybe there is more suitable languages to implement this project (must run on linux)?

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• Collision library for bullet hell in Python

  - by darkfeline

  I am making a bullet hell game in Python and am looking for a suitable collision library, taking the following into consideration: The library should do 2D polygon collision. It should be very fast. As a bullet hell game, I expect to do collision checks between hundreds, likely thousands of objects every frame at a consistent 60fps. Good documentation Permissive license (like MIT, not GPL) I am also considering writing my own library in C/C++ and wrapping with python ctypes in the event that no such library exists, though I do not have experience with collision detection algorithms, so I am not sure if this would be more trouble than it's worth. Could someone provide some guidance on this matter?

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• Dynamic Memory Allocation and Memory Management

  - by Bunkai.Satori

  In an average game, there are hundreds or maybe thousands of objects in the scene. Is it completely correct to allocate memory for all objects, including gun shots (bullets), dynamically via default new()? Should I create any memory pool for dynamic allocation, or is there no need to bother with this? What if the target platform are mobile devices? Is there a need for a memory manager in a mobile game, please? Thank you. Language Used: C++; Currently developed under Windows, but planned to be ported later.

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• Hide collision layer in libgdx with TiledMap?

  - by Daniel Jonsson

  I'm making a 2D game with libgdx, and I'm using its TileMapRenderer to render my map which I have made in the map editor Tiled. In Tiled I have a dedicated collision layer. However, I can't figure out how I'm supposed to hide it and its tiles in the game. This is how a map is loaded: TiledMap map = TiledLoader.createMap(Gdx.files.internal("maps/map.tmx")); TileAtlas atlas = new TileAtlas(map, Gdx.files.internal("maps")); tileMapRenderer = new TileMapRenderer(map, atlas, 32, 32); Currently the collision tiles are rendered on top of everything else, as I see them in the map editor.

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• How do I set a touch listener in a child scene in AndEngine?

  - by Siddharth

  In my game, I want to implement touch listener for my child scene objects. Basically I tried all the possible way to implement this that I have usually done for my normal scenes, but those methods do not work here. Could somebody provide some guidance for setting touch area listener in child scene? Here is my code: menuScene.setTouchAreaBindingEnabled(true); menuScene.registerTouchArea(resumeButtonSprite); menuScene.registerTouchArea(retryButtonSprite); menuScene.registerTouchArea(exitButtonSprite); menuScene.setOnAreaTouchListener(new IOnAreaTouchListener() { @Override public boolean onAreaTouched(TouchEvent pSceneTouchEvent, ITouchArea pTouchArea, float pTouchAreaLocalX, float pTouchAreaLocalY) { System.out.println("Touch"); return true; } }); In this code, menuScene was a child scene activity. Also after research I found that my engine was stopped while the child scene was activated so the touch event is not detected. I want to implement a pause menu in my game so any desirable solution for a pause menu implementation would help.

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• How do I break an image into 6 or 8 pieces of different shapes?

  - by Anil gupta

  I am working on puzzle game, where the player can select an image from iPhone photo gallery. The selected image will save in puzzle page and after 3 second wait the selected image will be broken into 6 or 8 parts of different shapes. Then player will arrange these broken parts of images to make the original image. I am not getting idea how to break the image and merged so that player arrange the broken part. I want to break image like this below frame. I am developing this game in cocos2d.

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• How to achieve highly accurate car physics such as Liveforspeed?

  - by Kim Jong Woo

  Liveforspeed is a racing simulator, there is amazing amount of realistic physics. for example, tires get warm, tire actually deforms when you turn corners. You need to play this game with a mouse at the minimum because it almost drives like the real thing. Anyhow, how does one achieve that level of physics simulation? Are there off-the-shelf solutions out there? If not, how does one start with simulating real world physics as close as possible. I would love to be able to work on an opensource car physics focused game. Imagine, more passionate developers, it could keep things going.

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• XNA - Drawing 2D Primitives (Boxes) and Understanding Matrices in Computer Graphics

  - by MintyAnt

  I have two issues which I wish to solve by creating 2D primitives in XNA. In my game, I wish to have a "debug mode" which will draw a red box around all hitboxes in the game (Red outline, transparent inside). This would allow us to see where the hitboxes are being drawn AND still have the sprite graphics being drawn. I wish to further understand how matrices work within computer graphics. I have a basic theoretical grasp of how they work, but I really just want to apply some of my knowledge or find a good tutorial on it. To do this, I wish to draw my own 2D primitives (With Vertex3's) and apply different transormation matrices to them. I was trying to find a tutorial on drawing primitives using Direct3D, but most tutorials are only for c++, and just tell me to use XNA's Spritebatch. I wish to have more control over my program than just with Spritebatch. Any Help on using Direct3D or any other suggestions would greatly be appreciated. Thank you.

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• Rendering of 2d water

  - by luke

  Suppose you have a nice way to move your 2D particles in order to simulate a fluid (like water). Any ideas on how to render it? Consider the fact that the game is a 2D game. The perspective is like this (the first image i have found): an example of 2d water. The water will be contained in boxes that can be broken in order to let it fall down and interact with other objects. The most simple way that comes to my mind is to use a small image for each particle. I am interested in hearing more ways of rendering water. Thank you.

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• Sharing the effect

  - by Mohammad Ahmed

  my problem is : If I load 2 models ( the same model zombie ) and give them the same effect I got the following error : for(int i =0 ; i<2 ; i++) { dwarfModel[i].model = Content.Load<Model>("Models//dwarf//dwarfmodel"); dwarfModel[i].effect = Content.Load<Effect>("Models//dwarf//skinFX"); dwarfModel[i].setEffect(camera , game); dwarfModel[i].setModelAnimationStatus(game); dwarfModel[i].intializeChrachterController(new Vector3(0, 0, 0), 20, 10, 2000, 2000, 80, 40); space.Add(dwarfModel[i].chrachterController); dwarfModels.Add(dwarfModel); } enter code here

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• How to achieve a Gaussian Blur effect for shadows in LWJGL/Slick2D?

  - by user46883

  I am currently trying to implement shadows into my game, and after a lot of searching in the interwebs I came to the conclusion that drawing hard edged shadows to a low resolution pass combined with a Gaussian blur effect would fit best and make a good compromise between performance and looks - even though theyre not 100% physically accurate. Now my problem is, that I dont really know how to implement the Gaussian blur part. Its not difficult to draw shadows to a low resolutions buffer image and then stretch it which makes it more smooth, but I need to add the Gaussian blur effect. I have searched a lot on that and found some approachs for GLSL, some even here, but none of them really helped it. My game is written in Java using Slick2D/LWJGL and I would appreciate any help or approaches for an algorithm or maybe even an existing library to achieve that effect. Thanks for any help in advance.

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• Stats on Screen Size for Flash Games

  - by ashes999

  I'm working on a Flash game after many, many years. I'm trying to figure out size to make my application run (eg. 600x800). Because it's a tall (not wide) game, I'm confused. I know about (and love) the Steam hardware stats. However, for Flash gaming, I have two nit-picks with their survey sample: 1) Caters to more hardcore gamers with better hardware (overall) 2) Captures only a subset of Flash gamers. Doesn't capture people who play at school, work, etc. or not netbooks and lighter machines. Are there any sort of statistics I can use to determine which size to use? Ideally, I would like to know something like: 800x600 will fit 94% of users screens 1024x768 will fit 74% of users screens 1200x960 will fit 53% of users screens etc.

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• How can I generate a 2d navigation mesh in a dynamic environment at runtime?

  - by Stephen

  So I've grasped how to use A* for path-finding, and I am able to use it on a grid. However, my game world is huge and I have many enemies moving toward the player, which is a moving target, so a grid system is too slow for path-finding. I need to simplify my node graph by using a navigational mesh. I grasp the concept of "how" a mesh works (finding a path through nodes on the vertices and/or the centers of the edges of polygons). My game uses dynamic obstacles that are procedurally generated at run-time. I can't quite wrap my head around how to take a plane that has multiple obstacles in it and programatically divide the walkable area up into polygons for the navigation mesh, like the following image. Where do I start? How do I know when a segment of walk-able area is already defined, or worse, when I realize I need to subdivide a previously defined walk-able area as the algorithm "walks" through the map? I'm using javascript in nodejs, if it matters.

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