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  • Importing Models from Maya to OpenGL

    - by Mert Toka
    I am looking for ways to import models to my game project. I am using Maya as modelling software, and GLUT for windowing of my game. I found this great parser, it imports all the textures and normal vectors, but it is compatible with .obj files of 3dsMAX. I tried to use it with Maya obj's, and it turned out that Maya's obj files are a bit different from former one, thus it cannot parse them. If you know any way to convert Maya obj files to 3dsMax obj files, that would be acceptable as well as a new parser for Maya obj files.

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  • Is knowledge of hacking mechanisms required for an MMO?

    - by Gabe
    Say I was planning on, in the future (not now! There is alot I need to learn first) looking to participating in a group project that was going to make a massively multiplayer online game (mmo), and my job would be the networking portion. I'm not that familiar with network programming (I've read a very basic book on PHP, MYSQL and I messed around a bit with WAMP). In the course of my studying of PHP and MYSQL, should I look into hacking? Hacking as in port scanning, router hacking, etc. In MMOs people are always trying to cheat, bots and such, but the worst scenario would be having someone hack the databases. This is just my conception of this, I really don't know. I do however understand networking fairly well, like subnetting/ports/IP's (local/global)/etc. In your professional opinion, (If you understand the topic, enlighten me) Should I learn about these things in order to counter the possibility of this happening? Also, out of the things I mentioned (port scanning, router hacking) Is there anything else that pertains to hacking that I should look into? I'm not too familiar with the malicious/Security aspects of Networking. And a note: I'm not some kid trying to learn how to hack. I just want to learn as much as possible before I go to college, and I really need to know if I need to study this or not.

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  • How do multi-platform games usually store save data?

    - by PixelPerfect3
    I realize this is a bit of a broad question, but I was wondering if there is a "standard" in the industry when it comes to storing save data for games (and is it different across platforms - Xbox/PS/PC/Mac/Android/iOS?) For example for a game like Assassin's Creed or The Walking Dead: They are on multiple platforms and they usually have to save enough information about the player and their actions. Do they use something like XML files, databases, or just straight binary dumps? How much does it differ from platform to platform? I would appreciate it if someone with experience in the game industry would answer this.

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  • How to make an arc'd, but not mario-like jump in python, pygame [duplicate]

    - by PythonInProgress
    This question already has an answer here: Arc'd jumping method? 2 answers Analysis of Mario game Physics [closed] 6 answers I have looked at many, many questions similar to this, and cannot find a simple answer that includes the needed code. What i am trying to do is raise the y value of a square for a certain amount of time, then raise it a bit more, then a bit more, then lower it twice. I cant figure out how to use acceleration/friction, and might want to do that too. P.S. - can someone tell me if i should post this on stackoverflow or not? Thanks all! Edit: What i am looking for is not mario-like physics, but a simple equation that can be used to increase then decrease height over the time over a few seconds.

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  • Ouya build experiencing odd graphical artifacts, screen half black

    - by Neeko
    I'm witnessing very odd graphical artifacts when I run my Unity game on Ouya. After the Unity splash screen, the game loads with the screen half black. This seemingly has started occurring out of the blue. It also doesn't occur in the editor or the standalone build, only on Ouya. I can't think of a single reason why this would be happening. If I open the Ouya menu screen and close it, the game returns to normal; somewhat, as there may be some artifacts lingering but the screen isn't half black like in the screen shot above. I know there's not much to go off of, but any insight into why this may be happening is greatly appreciated.

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  • Changing the material on an object on click in unity

    - by user1509674
    Iam working on unity2d.I have six game object Object1,Object1,Object1,(these are images) ObjectImage1,ObjectImage2,ObjectImage3(these are images). I have arranged the object in the scene as a list one below another Object1 Object2 Object3 When I click the Object1 --- should change to ObjectImage1 Object2 ----should change to ObjectImage2, but the above image of object1(objectImage1) at present should change to Object1 Object3 ----? should change to ObjectImage3,but the above image on object2(objectImage2) should change to Object2 These is similar to selection.I have coded Like when I click of Object2 its changing to ObjectIamge2 but the first object is not changing to object1 from objectImage1.Can anybody help me coding it out. Edit: public GameObject newSprite; private Vector3 currentSpritePosition; void Start() { newSprite.renderer.enabled = false; currentSpritePosition = transform.position; //then make it invisible renderer.enabled = false; //give the new sprite the position of the latter newSprite.transform.position = currentSpritePosition; //then make it visible newSprite.renderer.enabled = true; } void OnMouseExit(){ //just the reverse process renderer.enabled = true; newSprite.renderer.enabled = false; } This is the code used to change the material: public GameObject newSprite; private Vector3 currentSpritePosition; void Start(){ newSprite.renderer.enabled = false; } void OnMouseEnter(){ //getting the current position of the current sprite if ever it can move; currentSpritePosition = transform.position; //then make it invisible renderer.enabled = false; //give the new sprite the position of the latter newSprite.transform.position = currentSpritePosition; //then make it visible newSprite.renderer.enabled = true; } void OnMouseExit(){ //just the reverse process renderer.enabled = true; newSprite.renderer.enabled = false; }

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  • Can I use DllImport/PInvoke in libraries loaded as Assets in Unity Free?

    - by sebf
    I am interested in using utilising third-party libraries in Unity Free. I know Unity can use managed libraries as Assets, but only the Pro version supports using native libraries. (DllImport within scripts). This thread however suggests that it is possible to import DLLs in the free version. I would like to utilise native libraries (as a hobbyist I cannot afford Pro), but want to do it the supported way so I don't have to worry about Unity 'fixing' this hole if that is what it is. Is there any supported way to use native libraries with Unity free? (i.e. does that thread suggest a workaround or is it a 'bug'? Is it supported to use DllImport/PInvoke in libraries loaded as assets? (could I create a wrapper myself?)

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  • How can I get six Xbox controllers to provide input to an HTML5 game?

    - by Daniel X Moore
    I'm creating a six player HTML 5 game designed to be played locally (Red Ice). I've previous set up handling 7 Wiimotes using something along the lines of Joy2Key to map each input for each player to a separate keyboard key, but Wiimotes are pretty hard on the hands for these types of games and not very ergonomic so I thought I'd try and get Xbox controller support. I don't believe that any simple key mapping solution will work due to the nature of the directional stick. My inclination is that this will require a browser plugin and if so I'd prefer to write the plugin for Google Chrome. How do I create a Chrome browser plugin to handle multiple Xbox controllers or is there some other way? Please do not answer this question saying it can't be done, because it absolutely can. EDIT: I don't believe any keymapping/mouse simulating solution will work unless it can reliably distinguish six axis of inputs, one per player.

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  • Displaying text letter by letter

    - by Evi
    I am planing to Write a Text adventure and I don't know how to make the text draw letter by letter in any other way than changing the variable from h to he to hel to hell to hello That would be a terrible amount of work since there are tons of dialogue. Here is the source code so far { /// <summary> /// This is the main type for your game /// </summary> public class Game1 : Microsoft.Xna.Framework.Game { GraphicsDeviceManager graphics; SpriteBatch spriteBatch; Texture2D sampleBG; Texture2D TextBG; SpriteFont defaultfont; KeyboardState keyboardstate; public bool spacepress = false; public bool mspress = false; public int textheight = 425; public int rowspace = 40; public string namebox = "(null)"; public string Row1 = "(null)"; public string Row2 = "(null)"; public string Row3 = "(null)"; public string Row4 = "(null)"; public int Dialogue = 0; public Game1() { graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content"; graphics.PreferredBackBufferHeight = 600; graphics.PreferredBackBufferWidth = 800; IsMouseVisible = true; } /// <summary> /// Allows the game to perform any initialization it needs to before starting to run. /// This is where it can query for any required services and load any non-graphic /// related content. Calling base.Initialize will enumerate through any components /// and initialize them as well. /// </summary> protected override void Initialize() { // TODO: Add your initialization logic here base.Initialize(); } /// <summary> /// LoadContent will be called once per game and is the place to load /// all of your content. /// </summary> protected override void LoadContent() { // Create a new SpriteBatch, which can be used to draw textures. spriteBatch = new SpriteBatch(GraphicsDevice); // TODO: use this.Content to load your game content here sampleBG = Content.Load <Texture2D>("SampleBG"); defaultfont = Content.Load<SpriteFont>("SpriteFont1"); TextBG = Content.Load<Texture2D>("textbg"); } /// <summary> /// UnloadContent will be called once per game and is the place to unload /// all content. /// </summary> protected override void UnloadContent() { // TODO: Unload any non ContentManager content here } /// <summary> /// Allows the game to run logic such as updating the world, /// checking for collisions, gathering input, and playing audio. /// </summary> /// <param name="gameTime">Provides a snapshot of timing values.</param> protected override void Update(GameTime gameTime) { KeyboardState keyboardstate = Keyboard.GetState(); MouseState mousestate = Mouse.GetState(); // Changes Dialgue by pressing Left Mouse Button or Space #region Dialogue changer if (mousestate.LeftButton == ButtonState.Pressed && mspress == false) { mspress = true; Dialogue = Dialogue + 1; } if (mousestate.LeftButton == ButtonState.Released && mspress == true) { mspress = false; } if (keyboardstate.IsKeyDown(Keys.Space) && spacepress == false) { spacepress = true; Dialogue = Dialogue + 1; } if (keyboardstate.IsKeyUp(Keys.Space) && spacepress == true) { spacepress = false; } #endregion // ------------------------------------------------------ // Dialgue Content #region Dialgue if (Dialogue == 1) { Row1 = "Input Text 1 Here."; Row2 = "Input Text 2 Here."; Row3 = "Input Text 3 Here."; Row4 = "Input Text 4 Here."; } if (Dialogue == 2) { Row1 = "Text 1"; Row2 = "Text 2"; Row3 = "Text 3"; Row4 = "Text 4"; } #endregion // ------------------------------------------------------ base.Update(gameTime); } /// <summary> /// This is called when the game should draw itself. /// </summary> /// <param name="gameTime">Provides a snapshot of timing values.</param> protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.CornflowerBlue); // TODO: Add your drawing code here spriteBatch.Begin(); spriteBatch.Draw(sampleBG, new Rectangle(0, 0, 800, 600), Color.White); spriteBatch.Draw(TextBG, new Rectangle(0, 400, 800, 200), Color.White); spriteBatch.DrawString(defaultfont, Row1, new Vector2(10, (textheight + (rowspace * 0))), Color.Black); spriteBatch.DrawString(defaultfont, Row2, new Vector2(10, (textheight + (rowspace * 1))), Color.Black); spriteBatch.DrawString(defaultfont, Row3, new Vector2(10, (textheight + (rowspace * 2))), Color.Black); spriteBatch.DrawString(defaultfont, Row4, new Vector2(10, (textheight + (rowspace * 3))), Color.Black); spriteBatch.End(); base.Draw(gameTime); } } }

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  • Game Formula/Mechanic

    - by Georgiadis Abraam
    i am trying to design a game for a project i have, The main idea is a 3 Type of Heroes 3 Stat per Hero There are no levels involved so the differences must be located on Stats. Flogic)The logic of fight is that type1hero has good chances winning type2hero, type2hero has good chances type3hero and type3hero has good chances winning type1hero. For over a week i am trying to find a stats based formula that will allow me to fix this but i cant, i was meddling with numbers yesterday and it was decent but i cant extract the formula out of it. Could you plz guide me or give me hints on how should i start creating formulas on a Non lvl game that fulfills the fLogic?

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  • Load order in XNA?

    - by marc wellman
    I am wondering whether the is a mechanism to manually control the call-order of void Game.LoadContent() as it is the case with void Game.Draw(GameTime gt) by setting int DrawableGameComponent.DrawOrder ? except the order that results from adding components to the Game.Components container and maybe there exists something similar with Game.Update(GameTime gt) ? UPDATE To exemplify my issue consider you have several game components which do depends to each other regarding their instantiation. All are inherited from DrawableGameComponent. Now suppose that in one of these components you are loading a Model from the games content pipeline and add it to some static container in order to provide access to it for other game components. public override LoadContent() { // ... Model m = _contentManager.Load<Model>(@"content/myModel"); // GameComponents is a static class with an accessible list where game components reside. GameComponents.AddCompnent(m); // ... } Now it's easy to imagine that this components load method has to precede other game components that do want to access the model m in their own load method.

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  • GLSL, is it possible to offsetting vertices based on height map colour?

    - by Rob
    I am attempting to generate some terrain based upon a heightmap. I have generated a 32 x 32 grid and a corresponding height map - In my vertex shader I am trying to offset the position of the Y axis based upon the colour of the heightmap, white vertices being higher than black ones. //Vertex Shader Code #version 330 uniform mat4 modelMatrix; uniform mat4 viewMatrix; uniform mat4 projectionMatrix; uniform sampler2D heightmap; layout (location=0) in vec4 vertexPos; layout (location=1) in vec4 vertexColour; layout (location=3) in vec2 vertexTextureCoord; layout (location=4) in float offset; out vec4 fragCol; out vec4 fragPos; out vec2 fragTex; void main() { // Retreive the current pixel's colour vec4 hmColour = texture(heightmap,vertexTextureCoord); // Offset the y position by the value of current texel's colour value ? vec4 offset = vec4(vertexPos.x , vertexPos.y + hmColour.r, vertexPos.z , 1.0); // Final Position gl_Position = projectionMatrix * viewMatrix * modelMatrix * offset; // Data sent to Fragment Shader. fragCol = vertexColour; fragPos = vertexPos; fragTex = vertexTextureCoord; } However the code I have produced only creates a grid with none of the y vertices higher than any others.

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  • Physics in carrom like game using cocos2d + Box2D

    - by Raj
    I am working on carrom like game using cocos2d + Box2D. I set world gravity(0,0), want gravity in z-axis. I set following values for coin and striker body: Coin body (circle with radius - 15/PTM_RATIO): density = 20.0f; friction = 0.4f; restitution = 0.6f; Striker body (circle with radius - 15/PTM_RATIO): density = 25.0f; friction = 0.6f; restitution = 0.3f; Output is not smooth. When I apply ApplyLinearImpulse(force,position) the coin movement looks like floating in the air - takes too much time to stop. What values for coin and striker make it look like real carrom?

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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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  • Island Generation Library

    - by thatguy
    Can anyone recommend a tile map generator (written in Java is a plus), where one can control some land types? For example: islands, large continents, singe large continent, archipelago, etc. I've been reading through many posts on the subject, it almost seems like many are just rolling their own. Before creating my own, I'm wondering if there's already an open source implementation that I might not be finding. If not, it seems like using Perlin Noise is a popular choice. Some articles I've been reading: http://simblob.blogspot.com/2010/01/simple-map-generation.html Generate islands/continents with simplex noise https://sites.google.com/site/minecraftlandgenerator/

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  • Artifacts when using SamplerState.LinearClamp in SpriteBatch

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

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  • Trying to setup first DirectX project (don't understand the error) [on hold]

    - by user1157885
    I've just started learning DirectX with the book "3D Game Programming with DirectX". I just finished setting up all the paths and adding the code to the project which I think I did correctly, but I get this massive error which I don't really understand and is hard to google. Could someone tell me what it means and how to fix it? Error 1 error TRK0002: Failed to execute command: ""C:\Program Files (x86)\Microsoft DirectX SDK (June 2010)\Utilities\bin\x64\fxc.exe" /nologo /Emain /Fo "C:\Desktop\DirectX 11 Projects\box\Win32Project2\Debug\color.cso" /Od /Zi "....\Book Files\3DGameProg\DVD\Code\Chapter 6 Drawing in Direct3D\Box\FX\color.fx"". The handle is invalid.

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  • PCF shadow shader math causing artifacts

    - by user2971069
    For a while now I used PCSS for my shadow technique of choice until I discovered a type of percentage closer filtering. This method creates really smooth shadows and with hopes of improving performance, with only a fraction of texture samples, I tried to implement PCF into my shader. This is the relevant code: float c0, c1, c2, c3; float f = blurFactor; float2 coord = ProjectedTexCoords; if (receiverDistance - tex2D(lightSampler, coord + float2(0, 0)).x > 0.0007) c0 = 1; if (receiverDistance - tex2D(lightSampler, coord + float2(f, 0)).x > 0.0007) c1 = 1; if (receiverDistance - tex2D(lightSampler, coord + float2(0, f)).x > 0.0007) c2 = 1; if (receiverDistance - tex2D(lightSampler, coord + float2(f, f)).x > 0.0007) c3 = 1; coord = (coord % f) / f; return 1 - (c0 * (1 - coord.x) * (1 - coord.y) + c1 * coord.x * (1 - coord.y) + c2 * (1 - coord.x) * coord.y + c3 * coord.x * coord.y); This is a very basic implementation. blurFactor is initialized with 1 / LightTextureSize. So the if statements fetch the occlusion values for the four adjacent texels. I now want to weight each value based on the actual position of the texture coordinate. If it's near the bottom-right pixel, that occlusion value should be preferred. The weighting itself is done with a simple bilinear interpolation function, however this function takes a 2d vector in the range [0..1] so I have to convert my texture coordinate to get the distance from my first pixel to the second one in range [0..1]. For that I used the mod operator to get it into [0..f] range and then divided by f. This code makes sense to me, and for specific blurFactors it works, producing really smooth one pixel wide shadows, but not for all blurFactors. Initially blurFactor is (1 / LightTextureSize) to sample the 4 adjacent texels. I now want to increase the blurFactor by factor x to get a smooth interpolation across maybe 4 or so pixels. But that is when weird artifacts show up. Here is an image: Using a 1x on blurFactor produces a good result, 0.5 is as expected not so smooth. 2x however doesn't work at all. I found that only a factor of 1/2^n produces an good result, every other factor produces artifacts. I'm pretty sure the error lies here: coord = (coord % f) / f; Maybe the modulo is not calculated correctly? I have no idea how to fix that. Is it even possible for pixel that are further than 1 pixel away?

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  • GLM Velocity Vectors - Basic Maths to Simulate Steering

    - by Reanimation
    UPDATE - Code updated below but still need help adjusting my math. I have a cube rendered on the screen which represents a car (or similar). Using Projection/Model matrices and Glm I am able to move it back and fourth along the axes and rotate it left or right. I'm having trouble with the vector mathematics to make the cube move forwards no matter which direction it's current orientation is. (ie. if I would like, if it's rotated right 30degrees, when it's move forwards, it travels along the 30degree angle on a new axes). I hope I've explained that correctly. This is what I've managed to do so far in terms of using glm to move the cube: glm::vec3 vel; //velocity vector void renderMovingCube(){ glUseProgram(movingCubeShader.handle()); GLuint matrixLoc4MovingCube = glGetUniformLocation(movingCubeShader.handle(), "ProjectionMatrix"); glUniformMatrix4fv(matrixLoc4MovingCube, 1, GL_FALSE, &ProjectionMatrix[0][0]); glm::mat4 viewMatrixMovingCube; viewMatrixMovingCube = glm::lookAt(camOrigin, camLookingAt, camNormalXYZ); vel.x = cos(rotX); vel.y=sin(rotX); vel*=moveCube; //move cube ModelViewMatrix = glm::translate(viewMatrixMovingCube,globalPos*vel); //bring ground and cube to bottom of screen ModelViewMatrix = glm::translate(ModelViewMatrix, glm::vec3(0,-48,0)); ModelViewMatrix = glm::rotate(ModelViewMatrix, rotX, glm::vec3(0,1,0)); //manually turn glUniformMatrix4fv(glGetUniformLocation(movingCubeShader.handle(), "ModelViewMatrix"), 1, GL_FALSE, &ModelViewMatrix[0][0]); //pass matrix to shader movingCube.render(); //draw glUseProgram(0); } keyboard input: void keyboard() { char BACKWARD = keys['S']; char FORWARD = keys['W']; char ROT_LEFT = keys['A']; char ROT_RIGHT = keys['D']; if (FORWARD) //W - move forwards { globalPos += vel; //globalPos.z -= moveCube; BACKWARD = false; } if (BACKWARD)//S - move backwards { globalPos.z += moveCube; FORWARD = false; } if (ROT_LEFT)//A - turn left { rotX +=0.01f; ROT_LEFT = false; } if (ROT_RIGHT)//D - turn right { rotX -=0.01f; ROT_RIGHT = false; } Where am I going wrong with my vectors? I would like change the direction of the cube (which it does) but then move forwards in that direction.

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  • Move model forward base on model orientation

    - by ChocoMan
    My model rotates on it's own Y-axis regardless of where it is in the world. Here are the controls for the left ThumbStick: UP (move model forward on Z-Axis) DOWN (move model backward on Z-Axis) LEFT & RIGHT (strafe to either side) The problem is adjusting the direction the model's orientation UP and DOWN if the player should also rotate the player while moving forward or backwards. An example what Im trying to achieve would be a car doing donuts. The car is always facing the current direction that it interprets as forward (or rear as backwards) in relation to it's local rotation. Here is how Im calling the movement: // Rotate model with Right Thumbstick along X-Axis modelRotation -= pController.ThumbSticks.Right.X * mRotSpeed; // Move Forward if (pController.IsButtonDown(Buttons.LeftThumbstickUp)) { modelPosition.Z -= -pController.ThumbSticks.Left.Y * speed; } // Move Backward if (pController.IsButtonDown(Buttons.LeftThumbstickDown)) { modelPosition.Z += pController.ThumbSticks.Left.Y * speed; } // Strafe Left if (pController.IsButtonDown(Buttons.LeftThumbstickLeft)) { modelPosition.X += -pController.ThumbSticks.Left.X * speed; } // Strafe Right if (pController.IsButtonDown(Buttons.LeftThumbstickRight)) { modelPosition.X -= pController.ThumbSticks.Left.X * speed; } // DeadZone if (!pController.IsButtonDown(Buttons.LeftThumbstickUp) && !pController.IsButtonDown(Buttons.LeftThumbstickDown) && !pController.IsButtonDown(Buttons.LeftThumbstickLeft) && !pController.IsButtonDown(Buttons.LeftThumbstickRight)) { }

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  • Shader optimization - cg/hlsl pseudo and via multiplication

    - by teodron
    Since HLSL/Cg do not allow texture fetching inside conditional blocks, I am first checking a variable and performing some computations, afterwards setting a float flag to 0.0 or 1.0, depending on the computations. I'd like to trigger a texture fetch only if the flag is 1.0 or not null, for that matter of fact. I kind of hoped this would do the trick: float4 TU0_atlas_colour = pseudoBool * tex2Dlod(TU0_texture, float4(tileCoord, 0, mipLevel)); That is, if pseudoBool is 0, will the texture fetch function still be called and produce overhead? I was hoping to prevent it from getting executed via this trick that usually works in plain C/C++.

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  • isometric drawing order with larger than single tile images - drawing order algorithm?

    - by Roger Smith
    I have an isometric map over which I place various images. Most images will fit over a single tile, but some images are slightly larger. For example, I have a bed of size 2x3 tiles. This creates a problem when drawing my objects to the screen as I get some tiles erroneously overlapping other tiles. The two solutions that I know of are either splitting the image into 1x1 tile segments or implementing my own draw order algorithm, for example by assigning each image a number. The image with number 1 is drawn first, then 2, 3 etc. Does anyone have advice on what I should do? It seems to me like splitting an isometric image is very non obvious. How do you decide which parts of the image are 'in' a particular tile? I can't afford to split up all of my images manually either. The draw order algorithm seems like a nicer choice but I am not sure if it's going to be easy to implement. I can't solve, in my head, how to deal with situations whereby you change the index of one image, which causes a knock on effect to many other images. If anyone has an resources/tutorials on this I would be most grateful.

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  • Eculidean space and vector magnitude

    - by Starkers
    Below we have distances from the origin calculated in two different ways, giving the Euclidean distance, the Manhattan distance and the Chebyshev distance. Euclidean distance is what we use to calculate the magnitude of vectors in 2D/3D games, and that makes sense to me: Let's say we have a vector that gives us the range a spaceship with limited fuel can travel. If we calculated this with Manhattan metric, our ship could travel a distance of X if it were travelling horizontally or vertically, however the second it attempted to travel diagonally it could only tavel X/2! So like I say, Euclidean distance does make sense. However, I still don't quite get how we calculate 'real' distances from the vector's magnitude. Here are two points, purple at (2,2) and green at (3,3). We can take two points away from each other to derive a vector. Let's create a vector to describe the magnitude and direction of purple from green: |d| = purple - green |d| = (purple.x, purple.y) - (green.x, green.y) |d| = (2, 2) - (3, 3) |d| = <-1,-1> Let's derive the magnitude of the vector via Pythagoras to get a Euclidean measurement: euc_magnitude = sqrt((x*x)+(y*y)) euc_magnitude = sqrt((-1*-1)+(-1*-1)) euc_magnitude = sqrt((1)+(1)) euc_magnitude = sqrt(2) euc_magnitude = 1.41 Now, if the answer had been 1, that would make sense to me, because 1 unit (in the direction described by the vector) from the green is bang on the purple. But it's not. It's 1.41. 1.41 units is the direction described, to me at least, makes us overshoot the purple by almost half a unit: So what do we do to the magnitude to allow us to calculate real distances on our point graph? Worth noting I'm a beginner just working my way through theory. Haven't programmed a game in my life!

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  • Extra fire simulation on iPad device

    - by Nezam
    I have with me an iOS app for iPad which creates a few fire simulations over a png.Well,its working well exactly how we wanted it but when we are testing it on a device,we get an extra fire simulation.Heres the screen: iPad Simulator: This is how it should display (iPad Simulation) iPad Device: This is how its displaying (iPad Device) M ready to share whichever portion of my code which gets me to my solution once someone gets hit here.Thanks in advance

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  • How do I make time?

    - by SystemNetworks
    I wanted to output a text for a certain amount of time. One way is to use threads. Are there any other ways? I can't use threads for slick2d. This is my code when I use threads for slick: package javagame; import org.newdawn.slick.GameContainer; import org.newdawn.slick.Graphics; import org.newdawn.slick.Image; import java.util.Random; import org.newdawn.slick.Input; import org.newdawn.slick.*; import org.newdawn.slick.state.*; import org.lwjgl.input.Mouse; public class thread1 implements Runnable { String showUp; int timeLeft; public thread1(String s) { s = showUp; } public void run(Graphics g) { try { g.drawString("%s is sleeping %d", 500, 500); Thread.sleep(timeLeft); g.drawString("%s is awake", 600,600); } catch(Exception e) { } } @Override public void run() { // TODO Auto-generated method stub run(); } } It auto generates a new run() And also when I call it to my main class it has stack overflow!

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