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• Sphere Texture Mapping shows visible seams

  - by AvengerDr

  As you can see from the above picture there is a visible seam in the texture mapping. The underlying mesh is a geosphere based on octahedron subdivisions. On that particular latitude, vertices have been duplicated. However there still is a visible seam. Here is how I calculate the UV coordinates: float longitude = (float)Math.Atan2(normal.X, -normal.Z); float latitude = (float)Math.Acos(normal.Y); float u = (float)(longitude / (Math.PI * 2.0) + 0.5); float v = (float)(latitude / Math.PI); Is this a problem in the coordinates or a mipmapping issue?

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• Playing a Song causing WP7 to crash on phone, but not on emulator

  - by Michael Zehnich

  Hi there, I am trying to implement a song into a game that begins playing and continually loops on Windows Phone 7 via XNA 4.0. On the emulator, this works fine, however when deployed to a phone, it simply gives a black screen before going back to the home screen. Here is the rogue code in question, and commenting this code out makes the app run fine on the phone: // in the constructor fields private Song song; // in the LoadContent() method song = Content.Load<Song>("song"); // in the Update() method if (MediaPlayer.GameHasControl && MediaPlayer.State != MediaState.Playing) { MediaPlayer.Play(song); } The song file itself is a 2:53 long, 2.28mb .wma file at 106kbps bitrate. Again this works perfectly on emulator but does not run at all on phone. Thanks for any help you can provide!

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• Kepler orbit : get position on the orbit over time

  - by Artefact2

  I'm developing a space-simulation related game, and I am having some trouble implementing the movement of binary stars, like this: The two stars orbit their centroid, and their trajectories are ellipses. I basically know how to determine the angular velocity at any position, but not the angular velocity over time. So, for a given angle, I can very easily compute the stars position (cf. http://en.wikipedia.org/wiki/Orbit_equation). I'd want to get the stars position over time. The parametric equations of the ellipse works but doesn't give the correct speed : { X(t) = a×cos(t) ; Y(t) = b×sin(t) }. Is it possible, and how can it be done?

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• Acceptable sound quality: stereo needed for an Android game?

  - by Thomas Calc

  I have various simple short sound effects (damage sound, dying sound, thunderbolt, fanfare, breaking) for a game that is developed for Android currently. I use OGG files: 96kbps VBR, 44.1KHz, 2 channels (that means stereo, right?). I read the other stackexchange topics about "acceptable sound quality", but they're too general, address too many things. My experience is that even with 80kbps, my effects sound OK. But I tested it on a limited number of Android devices (including a Sony Ericsson Xperia Neo and a HTC Desire HD). My questions: For mobile phones and tablets, generally, what parameters are recommended? Won't my 80kbps sounds be bad on a newer device (such as a modern tablet)? I don't hear any difference between stereo and mono (2 channels vs. 1 channel, right?), is there any noticeable difference at all for mobile phones / tablets? (in terms of the player experience) May it worth it at all? I assume that stereo sounds take much more in memory (when they're decoded to PCM), despite of the fact that the compressed OGG size is practically the same. Reacting to Roy T.'s great comment: Actually, I couldn't measure the PCM size (Android decodes OGG internally), but I thought that stereo will take more space than mono when uncompressed After throwing out one of the WAV channels in Audacity, and re-exporting it: The new WAV file size is half than before The OGG file size is practically the same as before The sound effects and game music was recorded by my friend who is an experienced hobby musician/composer, but he knows little about computers & software so he just gave me some high-quality WAV files generated via his hardware.These were stereo, but if I check them in Audacity, both channels appear to be exactly the same.Can I consider them the same (= moving to mono), or might there be some unnoticeable differences to the human eye?

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• Auto Save and Auto Load Game onto the Device's Storage Concept Question

  - by David Dimalanta

  I'm trying to make a simple app that will test the save and load state. Is it a good idea to make an app that has an auto save and load game feature only every time the newbies open the first app then continues it on the other day? I tried making a sprite that is moving, starting at the center. When I close and re-open the app, the sprite goes back to the center instead of the last coordinate where the sprite land on this part (i.e. at the top). The thing I want to know how the sequence of saving and loading goes like this: I open the app The starting sprite at the center. It displays a coordinate of the sprite plus number of times does the sprite move. I exit the app that automatically saves the game without notice. Finally, when I re-opened it, it automatically loads the game retaining the number of times the sprite move, coordinates, and the sprite's area landed. These steps above are similar, but not the sprite movement test app, to the sequence of saving and loading the game's level and record in Jewel Stackers for the Android app. And, by default, if there is no SD card in any tab or phone that runs on Android, does it automatically save/load onto the internal drive or the APK file itself? Is it also useful to use auto save and auto load feature for protecting and fetching informations (i.e. fastest time, last time where the sprite is located via coordinates, etc.)?

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• best way to compute vertex normals from a Triangle's list

  - by nkint

  hi i'm a complete newbie in computergraphics so sorry if it's a stupid answer. i'm trying to make a simple 3d engine from scratch, more for educational purpose than for real use. i have a Surface object with inside a Triangle's list. For now i compute normals inside Triangle class, in this way: triangle.computeFaceNormals() { Vec3D u = v1.sub(v3) Vec3D v = v1.sub(v2) Vec3D normal = Vec3D.cross(u,v) normal.normalized() this.n1 = this.n2 = this.n3 = normal } and when building surface: t = new Triangle(v1,v2,v3).computeFaceNormals() surface.addTriangle(t) and i think this is the best way to do that.. isn't it? now.. what about for vertex normals? i've found this simple algorithm: flipcode vertex normal but.. hei this algorithm has.. exponential complexity? (if my memory doesn't fail my computer science background..) (bytheway.. it has 3 nested loops.. i don't think it's the best way to do it..) any suggestion?

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• Workflow with Flash Pro CS6 and FlashDevelop: Using fla and swc to store assets

  - by Arthur Wulf White

  I am using this tutorial: http://www.flashdevelop.org/wikidocs/index.php?title=AS3:FlexAndFlashCS3Workflow In the past older versions of Flash Pro I was able to complete these steps: right-click on the symbol in the Library panel, select "Linkage..." dialog, check "Export for ActionScript" and fill in the symbol name (ie. MySymbol_design or assets.MySymbol_design), do not change the base class (ie. flash.display.MovieClip). Right now, I am stuck at that part. Any hints? What I wish to do is: Use fla for the artist to store assets. Publish to swc Extract the assets in FlashDevelop by creating an instance of their class. ... How is this done in CS6? To clear things up, this is what I see when I right click a Flash symbol:

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• How to fix bad Collada produced by FBX?

  - by David

  I tried to use the FBX SDK (2011.3.1) to load FBX files and save them as Collada files in order to be able to import FBX files in Panda3D. Unfortunately the resulting Collada files are not usable for several reasons, among them: There's a Maya specific extra technique diffuse <diffuse> <texture texture="Map__2-image" texcoord="CHANNEL0"> <extra> <technique profile="MAYA"> <wrapU sid="wrapU0">TRUE</wrapU> <wrapV sid="wrapV0">TRUE</wrapV> <blend_mode>ADD</blend_mode> </technique> </extra> </texture> </diffuse> It assigns a texcoord channel name that isn't referenced anywhere else in the file (in the previous code sample, no geometry uses "CHANNEL0"...) Every polygon is exported twice, a first time with a basic material (only diffuse color, specular color, etc.) and a second time with a textured material -- this doubles the number of polygons of each model without any valuable reason Anyway, the resulting Collada file cannot be opened correctly either with OpenCOLLADA or Panda3D's "dae2egg". Anyone has any experience on how to "fix" it and make it understandable by common and well-reputed Collada importers such as OpenCOLLADA?

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• Prototype experience: Unity3D vs UDK

  - by LukeN

  Has anyone yet prototyped a game in both Unity3D and UDK? If so, which features made prototyping the game easier or more difficult in each toolkit? Was one prototype demonstrably better than the other (given the same starting assets)? I'm looking for specific answers with regard to using the toolkit features, not a comparison of available features. E.g. Destructable terrain is easier in toolkit X for reasons Y and Z. I can code, so the limitations of the inbuilt scripting languages are not a problem.

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• Box Collider isn't rotating with Game Object

  - by pek

  I have a method that creates a room by instantiating a prefab, places it in a grid and the re-sizes the collider based on a room definition (location in grid, rotation, width and height). Here is the method: public void CreateRoom(RoomAction action) { GameObject roomGameObject = Instantiate(this.roomPrefab, Vector3.zero, action.RoomPrefab.transform.rotation) as GameObject; roomGameObject.transform.parent = this.transform; roomGameObject.transform.localPosition = new Vector3(action.MansionOffsetX, 0, -action.MansionOffsetY) * this.blockSize; roomGameObject.transform.localPosition += new Vector3((action.Room.Width * this.blockSize) / 2, 0, -((action.Room.Height * this.blockSize) / 2)); BoxCollider roomCollider = roomGameObject.GetComponent<BoxCollider>(); roomCollider.isTrigger = true; roomCollider.center = new Vector3(0, this.height / 2, 0); roomCollider.size = new Vector3(action.Room.Width * this.blockSize, this.height, action.Room.Height * this.blockSize); roomGameObject.transform.RotateAroundLocal(roomGameObject.transform.up, Mathf.Deg2Rad * -90 * action.Rotation); } The problem I'm having is that, while the room rotates correctly, but for some reason, the collider isn't rotating with the game object. Here is a screenshot: Any idea on what am I doing wrong?

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• Slick2D + LWJGL collision system

  - by Connor W

  So I've been learning java for a while and have explored slick and lwjgl before but went away from using Slick for a while. But I've recently gone back to using it (as I'm making a platformer and Tiled will be really helpful). But here's where my problems begin: collision. I have a player polygon and I check to see if it's colliding with my tiled map with this method: public static boolean playerCollisionWith() { for(int i = 0; i < Blockmap.entities.size(); i++) { Block entity1 = (Block) Blockmap.entities.get(i); if(playerPoly.intersects(entity1.poly)) { return true; } } return false; } This would work normally but I'm using a different method for movement. Instead of just adding a speed variable to the player's x axis. I move like this: if(Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) { speedX = Math.min(5, speedX + 1); moving = true; playerPoly.setX(x); if(playerCollisionWith()) { speedX = -5; playerPoly.setX(x); } } That Math.min call is what is messing me up =. I can't just call speedX = -5, because when I do the player "bounces" when the right mouse button is down and it's colliding. Bounces as in flashes back and forth REALLY quickly. But I don't really know how I would make it so that collisions on the y axis would work either, whether the player is jumping or not. So if I could get some help with how to fix this problem that would be great. Thank you for the help!

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• Keeping Aspect Screen Ratio While Stays in Center

  - by David Dimalanta

  I sqw and I tried this suggestion on PISTACHIO BRAINSTORMIN* on how to make a good and adaptive screen ration. For every different screen size, let's say I put the perfect circle as a Texture in LibGDX and played it on screen. Here's the blueberry image example and it's perfectly rounded: When I played it on the Google Nexus 7, the circle turn into a slightly oblonng shape, resembling as it was being flatten a bit. Please observe this snapshot below and you can see the blueberry is almost but slightly not perfectly rounded: Now, when I tried the suggested code for aspect ratio, the perfect circle retained but another problem is occured. The problem is that I expecting for a view on center but instead it's been moved to the right offset leaving with a half black screen. This would be look like this: Here is my code using the suggested screen aspect ratio code: Class' Field // Ingredients Needed for Screen Aspect Ratio private static final int VIRTUAL_WIDTH = 720; private static final int VIRTUAL_HEIGHT = 1280; private static final float ASPECT_RATIO = ((float) VIRTUAL_WIDTH)/((float) VIRTUAL_HEIGHT); private Camera Mother_Camera; private Rectangle Viewport; render() // Camera updating... Mother_Camera.update(); Mother_Camera.apply(Gdx.gl10); // Reseting viewport... Gdx.gl.glViewport((int) Viewport.x, (int) Viewport.y, (int) Viewport.width, (int) Viewport.height); // Clear previous frame. Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); show() Mother_Camera = new OrthographicCamera(VIRTUAL_WIDTH, VIRTUAL_HEIGHT); Was this code useful for screen aspect ratio-proportion fixing or it is statically dependent on actual device's width and height? *see http://blog.acamara.es/2012/02/05/keep-screen-aspect-ratio-with-different-resolutions-using-libgdx/#comment-317

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• What algorithm can I use to detect simple shapes in a 4x4 matrix?

  - by ion

  I'm working on a simple multiplayer game that receives a random 4x4 matrix from a server and extracts a shape from it. For example: XXOO OXOO XXOX XXOO XOOX and XOOO XXXX OXXX So in the first matrix the shape I want to parse is: oo o oo and the 2nd: oo oo ooo I know there must be an algorithm for this because I saw this kind of behavior on some puzzle games but I have no idea how to go about to detecting them or even where to start. So my question is: How do I detect what shape is in the matrix and how do I differentiate between multiple colors? (it doesn't come only in X and O, it comes in a maximum of 4). Additionally, the shape must be a minimum of 4 blocks.

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• Separate shaders from HTML file in WebGL

  - by Chris Smith

  I'm ramping up on WebGL and was wondering what is the best way to specify my vertex and fragment shaders. Looking at some tutorials, the shaders are embedded directly in the HTML. (And referenced via an ID.) For example: <script id="shader_1-fs" type="x-shader/x-fragment"> precision highp float; void main(void) { // ... } </script> <script id="shader_1-vs" type="x-shader/x-vertex"> attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; // ... My question is, is it possible to have my shaders referenced in a separate file? (Ideally as plain text.) I presume this is straight forward in JavaScript. Is there essentially a way to do this: var shaderText = LoadRemoteFileOnSever('/shaders/shader_1.txt');

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• Literature for Inverse Kinematics: Joint Limits and beyond

  - by Jeff

  Recently I've been playing around with Inverse Kinematics and have been pretty impressed with the results. Naturally I want to take it further, but have no clue where to start. In particular, I would like to introduce joint limits (ie for a prismatic joint how far it can move, hinge joint what angles it has to be between, etc etc). Currently I understand how to produce the Jacobian matrix for the various joint types. I am particularly looking for literature (preferably free, and preferably easy to understand) on various ways to implement joint limits. Also I would like to find out different ideas on how inverse kinematics can be used.

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• Unity3d: Box collider attached to animated FBX models through scripts at run-time have wrong dimension

  - by Heisenbug

  I have several scripts attached to static and non static models of my scene. All models are instantiated at run-time (and must be instantiated at run-time because I'm procedural building the scene). I'd like to add a BoxCollider or SphereCollider to my FBX models at runtime. With non animated models it works simply requiring BoxCollider component from the script attached to my GameObject. BoxCollider is created of the right dimension. Something like: [RequireComponent(typeof(BoxCollider))] public class AScript: MonoBehavior { } If I do the same thing with animated models, BoxCollider are created of the wrong dimension. For example if attach the script above to penelopeFBX model of the standard asset, BoxCollider is created smaller than the mesh itself. How can I solve this?

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• Best practice settings Effect parameters in XNA

  - by hichaeretaqua

  I want to ask if there is a best practice settings effect parameters in XNA. Or in other words, what exactly happens when I call pass.Apply(). I can imagine multiple scenarios: Each time Apply() is called, all effect parameters are transferred to the GPU and therefor it has no real influence how often I set a parameter. Each time Apply() is called, only the parameters that got reset are transferred. So caching Set-operations that don't actually set a new value should be avoided. Each time Apply() is called, only the parameters that got changed are transferred. So caching Set-operations is useless. This whole questions is bootless because no one of the mentions ways has any noteworthy impact on game performance. So the final question: Is it useful to implement some caching of Set-operation like: private Matrix _world; public Matrix World { get{ return _world;} set { if(value == world)return; _effect.Parameters["xWorld"].SetValue(value); _world = value; } Thanking you in anticipation

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• SDL to SFML simple question

  - by ultifinitus

  Hey! I've been working on a game in c++ for about a week and a half, and I've been using SDL. However, my current engine only needs the following from whatever library I use: enable double buffering load an image from path into something that I can apply to the screen apply an image to the screen with a certain x,y enable transparency on an image (possibly) image clipping, for sprite sheets. I am fairly sure that SFML has all of this functionality, I'm just not positive. Will someone confirm my suspicions? Also I have one or two questions regarding SFML itself. Do I have to do anything to enable hardware accelerated rendering? How quick is SFML at blending alpha values? (sorry for the less than intelligent question!)

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• Traffic estimation for a multiplayer flash game

  - by Steve Addington

  hey, i want to know if my rough traffic estimations are right, it would be for a pretty simple realtime flashgame in the style of haxball (but not as a soccer game) heres a video of it http://www.youtube.com/watch?v=z_xBdFg1RcI So here comes my estimation, i dont know if they are realistic! i hope someone can help me. consider the packet attached as a typical one sent every 200ms, its 148bytes + 64 bytes of header will make around a 200bytes packet. The server will receive 200bytes x 6 players x 5 times a sec=6000bytes/s=5.85Kbytes/s=46.9kbit/s plus he has to send all back to the players, so at this point are 94Kbit/s.The server received all the information, perform the definitive calculation and send the new position to all players, in a bigger packet of around 900bytes that have to be delivered to the others 6, which makes 900bytes x 6 players x 5 times a sec=27000bytes/s=26Kbytes/s=210kbit/s. overall that would be 26kbyte per second. thats like 130mb traffic per hour for a 6player room. but somehow i think the numbers are too high? that would be really much traffic for such a simple game. did i calculate something wrong?

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• xna download website source code

  - by Emre Canbazoglu

  I have to download the html code of a web site during the game. I am taking the poster url of a movie from the imdb web site by scrapping the html ( also other informations ). I have to do the download process many times during the game for different movies. I can download and scrap the html but downloading the html takes too much time and it causes the game to slow down(freeze while downloading). How can I solve this problem? My one approach is to download and scrap all the information and store them in a database before the game and during the game access this information from the database. I think this will work properly but that is not what I exactly want. It would be better if it is dynamic. I also thought of using multi-threading but I am a bit confused about how to implement threading in xna. I read some articles about it but it is not so clear. I mean when should I start the thread and what about the update function etc. I need your help guys

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• Mixing XNA and silverlight gives wierd graphics

  - by Mech0z

  I making a small 3dgame which is made as a Silverlight and XNA app, but when I draw the sprites the graphics becomes all wierd. All my primitive types are rendered correctly, but my 3d models are just wierd My Draw is like this when silverlight is set to draw private void OnDraw(object sender, GameTimerEventArgs e) { // Render the Silverlight controls using the UIElementRenderer elementRenderer.Render(); // Clear the screen to a solid color SharedGraphicsDeviceManager.Current.GraphicsDevice.Clear(Color.CornflowerBlue); switch (gameState) { case GameState.ChooseStarter: TextBlockStatus.Text = "Find Starting Player"; break; case GameState.PlaceBrick: TextBlockPlayer.Text = (playerTurn == PlayerTurn.PlayerOne) ? "Player One" : "Player Two"; TextBlockState.Text = "Place Brick"; foreach (IGraphicObject obj in _3dObjects) { obj.Draw(cameraPosition, e); } break; case GameState.GiveBrick: TextBlockState.Text = "Give Brick"; break; } spriteBatch.Begin(); // Using the texture from the UIElementRenderer, // draw the Silverlight controls to the screen spriteBatch.Draw(elementRenderer.Texture, cameraProjection, Color.White); spriteBatch.End(); } This gives me this output If I comment the spritebatch lines out I get the correct output, except the silverlight text is of course not shown I am not entirely sure what to look for except that zero vector I am giving to the spritebatch, but if thats the source I have no idea what I am supposed to set it as epspecially when its a 2d vector

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• Open Source AI Bot interfaces

  - by David Young

  What are some open source AI Bot interfaces? Similar to Pogamut 3 GameBots2004 for custom Unreal Tournament bots or Brood Wars API for Starcraft bots etc. If you could please post one AI bot interface per answer (make sure to provide a link) and give a brief summary as to the content of the blog posts. Please include what type of bot interface structure it is, client/server, server/server, etc e.g. BWAPI is client/server which emulates a real player

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• Combine Two Shader Program

  - by Siddharth

  For my android application, I want to apply brightness and contrast shader on same image. At present I am using gpuimage plugin. In that I found two separate program for brightness and contrast as per the following. Contrast shader: varying highp vec2 textureCoordinate; uniform sampler2D inputImageTexture; uniform lowp float contrast; void main() { lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate); gl_FragColor = vec4(((textureColor.rgb - vec3(0.5)) * contrast + vec3(0.5)), textureColor.w); } Brightness shader: varying highp vec2 textureCoordinate; uniform sampler2D inputImageTexture; uniform lowp float brightness; void main() { lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate); gl_FragColor = vec4((textureColor.rgb + vec3(brightness)), textureColor.w); } Now applying both of the effects I write following code varying highp vec2 textureCoordinate; uniform sampler2D inputImageTexture; varying highp vec2 textureCoordinate2; uniform sampler2D inputImageTexture2; uniform lowp float contrast; uniform lowp float brightness; void main() { lowp vec4 textureColorForContrast = texture2D(inputImageTexture, textureCoordinate); lowp vec4 contastVec4 = vec4(((textureColorForContrast.rgb - vec3(0.5)) * contrast + vec3(0.5)), textureColorForContrast.w); lowp vec4 textureColorForBrightness = texture2D(inputImageTexture2, textureCoordinate2); lowp vec4 brightnessVec4 = vec4((textureColorForBrightness.rgb + vec3(brightness)), textureColorForBrightness.w); gl_FragColor = contastVec4 + brightnessVec4; } Doesn't able to get desire result. I can't able to figure out what I have to do next? So please friends help me in this. What program I have to write?

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• Demystifying "chunked level of detail"

  - by Caius Eugene

  Just recently trying to make sense of implementing a chunked level of detail system in Unity. I'm going to be generating four mesh planes, each with a height map but I guess that isn't too important at the moment. I have a lot of questions after reading up about this technique, I hope this isn't too much to ask all in one go, but I would be extremely grateful for someone to help me make sense of this technique. 1 : I can't understand at which point down the Chunked LOD pipeline that the mesh gets split into chunks. Is this during the initial mesh generation, or is there a separate algorithm which does this. 2 : I understand that a Quadtree data structure is used to store the Chunked LOD data, I think i'm missing the point a bit, but Is the quadtree storing vertex and triangles data for each subdivision level? 3a : How is the camera distance usually calculated. When reading up about quadtree's, Axis-aligned bounding box's are mentioned a lot. In this case would each chunk have a collision bounding box to detect the camera or player is nearby? or is there a better way of doing this? (raycast maybe?) 3b : Do the chunks calculate the camera distance themselves? 4 : Does each chunk have the same "resolution". for example at top level the mesh will be 32x32, will each subdivided node also be 32x32. Example below:

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• How to deal with D3DX .dll hell?

  - by bluescrn

  There's a large number of versions of the D3DX dll, from each SDK update, each version having a unique name (http://www.toymaker.info/Games/html/d3dx_dlls.html). All-too-often, people have versions missing. So even though they have a compatible version of DirectX, your D3D-based project won't run on their machine. I want to be able to distribute games (little spare-time projects, game jam entries, etc) as a simple zip file, without the need for an installer. But a significant percentage of users run into missing D3DX .dll errors. And without an installer, Microsoft's official solution (the DirectX web installer/updater) isn't really much of a solution. Unfortunately, Microsoft still won't give us the option of static linking to D3DX (which would be a nice clean solution). And avoiding using D3DX isn't very practical, especially if you're working with shaders (and no, I'm not switching to OpenGL, at least for now) Does anyone have clever solutions to avoiding this DLL hell?

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