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  • Managing game objects/components

    - by Xeon06
    Good day everyone, By far the biggest problem that has always dawned on my when programming games is how to structure my code. It just becomes an incredible mess after a while. The reason for that is because I have no idea how different classes should interact with each other. Let's have an example. Say I have a class Player, a class PlayerInput and a class Map. The player class contains information as to the location of the player, whereas the player input class handles changing that location, but by first making sure it's within a walkable area from the map class. How to structure this? My usual approach is to pass those components as parameters in the constructors of the parameters that need them, like so: var map = new Map(); var player = new Player(); var input = new PlayerInput(player, map); The problem with that is that it quickly gets messy, when you add new components you have to go through your constructors and update them, and it doesn't work well if you have mirroring references: var physics = new Physics(input); //Oops, doesn't work var input = new Input(physics); So, how do you guys usually manage this? Thanks.

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  • What kind of performance issues does multiple instances of the exact same object have on a game?

    - by lggmonclar
    I'm fairly new to programming, and I've pretty much learned all the things I know on the go, while working on projects. The problem is that there some things that I just don't know where to begin searching. My question is about performance, and how can multiple instances of the same object affect it -- Specifically, I'm talking about XNA's "GraphicsDevice" class. I have it instanced on four different parts of my game, and in three of those, the object has the exact same values for all the attributes. So, in that case, should I be using the same instance of GraphicsDevice, passing it as a parameter, even if I use it in different classes? I apologize if the question seems redundant, but like I said, I've taught myself most of what I know, so there are quite a few "holes" in my learning process.

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  • Where can I get a list or data base of light reflectance values for different materials?

    - by mikidelux
    I'm implementing lighting for a WebGL app but I'm not an artist so I don't know how to generate or where to obtain a list of materials with its values (diffuse, specular, ambient and shininess). I've been searching a lot but with no luck. Is there any list or DB I might have overlooked? Any common repository or something similar? Thanks in advance. Note: English is not my main language, let me know if you don't understand something and I'll try to rephrase it.

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  • Scaling sprite velocity / co-ordinatesin Android

    - by user22241
    I'm trying to find the answer to a question that I've had for a long time, but am having trouble finding it! I hope someone can help :-) I'm trying to find information on how to scale sprite velocity / movement / co-ordinates. What I mean by this is how do I get a sprite to move at the same speed relative to the screen size / DPI so that it takes the same amount of real-time to get from one side of the screen to the other? All of the posts pertaining to sprite scaling that I can find on the various forums relate to the size of the sprite, but this part of it I'm OK with so far, it's just that when I move a sprite, it kind of gets there at different speed depending on the dpi / resolution of the device. I hope I'm making sense. This is the code I have so far, instead of using explicit amounts, like 1, I'm using something like the following: platSpeedFloat= (1 * (dpi/160)); //Use '1' so on an MDPI screen, the sprite will move by 1 physical pixel Then basically what I'm doing is something like this: (all varialble previously declared) platSpeedSave+=platSpeedFloat; //Add the platSpeedFloat value to the current platSpeedSave value platSpeed=(int) platSpeedSave; //Cast to int so it can be checked in the following statement if (platSpeed==platSpeedSave) //Check the casted int value to float value stored previoiusly {floorY=floorY-platSpeed; //If they match then change the Y value platSpeedSave=0;} //Reset Would be grateful if someone could assists - hope I'm making sense. The above doesn't seems to work the sprite moves 'faster' on lower DPI screens. Thanks

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  • How to find 2D grid cells swept by a moving circle?

    - by Nevermind
    I'm making a game based on a 2D grid, with some cells passable and some not. Dynamic objects can move continuously, independent of the grid, but need to collide with impassable cells. I wrote an algorithm to trace a ray against the grid, that gives me all cells that ray intersects. However, actual object are not point-sized; I'm currently representing them as circles. But I can't figure out an effective algorithm to trace a moving circle. Here's a picture of what I need: The numbers show in what order the circle collides with grid cells. Does anybody know the algorithm to find these collisions? Preferably in C#. Update The circle can be bigger than a single grid cell.

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  • Retrieve the coordinates of the *occluding* (closest/drawn) pixels during 3D overlap, using OpenGL?

    - by Big Rich
    Hi, Sorry if the question is not worded well, I'm a new to both 3D and OpenGL. How could I go about obtaining the 3D coordinates of the occluding object, at the point where occlusion is happening (i.e. the 'intersection' of the object in front/closest to the screen)? Just to offer a [very] rudimentary, visual, example, if you were to form an index-finger cross, with your right hand closest to your face, I'd like to know the coordinates of the part of your right finger which obscures the other finger (obviously back within the OpenGL context - no jokers ;-) ). If there is a way to find out both about the occluder (hider) and the occluded (hidden) objects in OpenGL, then that would be of great use, also. Cheers Rich

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  • Farseer circle hangs where it's spawned

    - by necrosmash
    I'm currently trying to simply spawn a circle in Farseer. However, it's stuck wherever I spawn it! The game is updating fine, as I can see the circle spinning in place when I spawn it because of how I currently have gravity set up (following code from Game1.cs): // Initialise the screen center for use with // the Level class screenCenter = new Vector2(graphics.GraphicsDevice.Viewport.Width / 2f, graphics.GraphicsDevice.Viewport.Height / 2f); world = new World(new Vector2(20, 20)); currentLevel = new Level1(screenCenter, circleSprite, groundSprite, ref world); Level1 constructor: public Level1(Vector2 screenCenter, Texture2D circleSprite, Texture2D groundSprite, ref World world) { player = new Player(ref world, screenCenter, circleSprite); ground = new Ground(ref world, screenCenter, groundSprite); listLevelItems = new List<LevelItem>(); listLevelItems.Add(player); listLevelItems.Add(ground); } Player constructor: public Player(ref World world, Vector2 screenCenter, Texture2D sprite) { setSprite(sprite); setPosition((screenCenter / MeterInPixels) + new Vector2(0f, 0f)); playerBody = BodyFactory.CreateCircle(world, 96f / (2f * MeterInPixels), 1f, playerPosition); getBody().BodyType = BodyType.Dynamic; // Ball bounce and friction getBody().Restitution = 0.3f; getBody().Friction = 0.5f; } If I use a breakpoint and change the playerBody position while the game is halted, the ball does move, but stays fixed in its new location. Any help would be greatly appreciated.

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  • Why are prefab customizations being applied to only a single character? [on hold]

    - by m0rgul
    I've built my (networked) game to the point where I have a room, some characters and a character customization screen. In the character customization screen I get to chose gender, chose from three different wardrobe options and assign custom colors to these wardrobe items. Then I use a custom object to store these options, serialize them and store them in PlayerPrefs, then load the next scene and apply them to my chosen character in this scene. Then I go and spawn some more characters, customize them, etc. The problem is that my character is always customized, but all other characters in the scene are default copies of the prefab. The prefabs themselves are a generic male and a generic female, both with three different wardrobes to chose from (they are included in the prefab). When I spawn my character, I go to the saved options in PlayerPrefs, destroy the two discarded wardrobes, apply color to my chosen wardrobe and then spawn the character. How would it be possible to make the other characters also show up in their customized form rather than just the generic prefab (which shows all three wardrobes at the same time)?

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  • does glBindAttribLocation silently ignore names not found in a shader?

    - by rwols
    Does glBindAttribLocation silently ignore names that are not found? For example, in a shader: // Some vertex shader in vec3 position; in vec3 normal; // ... And in some set up code: // While setting up shader GLuint program = glCreateProgram(); glBindAttribLocation(program, 0, "position"); glBindAttribLocation(program, 1, "normal"); glBindAttribLocation(program, 2, "color"); // What about this one? glLinkProgram(program);

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  • glutPostRedisplay() does not update display

    - by A D
    I am currently drawing a rectangle to the screen and would like to move it by using the arrow keys. However, when I press an arrow key the vertex data changes but the display does refresh to reflect these changes, even though I am calling glutPostRedisplay(). Is there something else that I must do? My code: #include <GL/glew.h> #include <GL/freeglut.h> #include <GL/freeglut_ext.h> #include <iostream> #include "Shaders.h" using namespace std; const int NUM_VERTICES = 6; const GLfloat POS_Y = -0.1; const GLfloat NEG_Y = -0.01; struct Vertex { GLfloat x; GLfloat y; Vertex() : x(0), y(0) {} Vertex(GLfloat givenX, GLfloat givenY) : x(givenX), y(givenY) {} }; Vertex left_paddle[NUM_VERTICES]; void init() { glClearColor(1.0f, 1.0f, 1.0f, 0.0f); left_paddle[0] = Vertex(-0.95f, 0.95f); left_paddle[1] = Vertex(-0.95f, 0.0f); left_paddle[2] = Vertex(-0.85f, 0.95f); left_paddle[3] = Vertex(-0.85f, 0.95f); left_paddle[4] = Vertex(-0.95f, 0.0f); left_paddle[5] = Vertex(-0.85f, 0.0f); GLuint vao; glGenVertexArrays( 1, &vao ); glBindVertexArray( vao ); GLuint buffer; glGenBuffers(1, &buffer); glBindBuffer(GL_ARRAY_BUFFER, buffer); glBufferData(GL_ARRAY_BUFFER, sizeof(left_paddle), NULL, GL_STATIC_DRAW); GLuint program = init_shaders( "vshader.glsl", "fshader.glsl" ); glUseProgram( program ); GLuint loc = glGetAttribLocation( program, "vPosition" ); glEnableVertexAttribArray( loc ); glVertexAttribPointer( loc, 2, GL_FLOAT, GL_FALSE, 0, 0); glBindVertexArray(vao); } void movePaddle(Vertex* array, GLfloat change) { for(int i = 0; i < NUM_VERTICES; i++) { array[i].y = array[i].y + change; } glutPostRedisplay(); } void special( int key, int x, int y ) { switch ( key ) { case GLUT_KEY_DOWN: movePaddle(left_paddle, NEG_Y); break; } } void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glDrawArrays(GL_TRIANGLES, 0, 6); glutSwapBuffers(); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(500,500); glutCreateWindow("Rectangle"); glewInit(); init(); glutDisplayFunc(display); glutSpecialFunc(special); glutMainLoop(); return 0; }

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  • How do I build a matrix to translate one set of points to another?

    - by dotminic
    I've got 3 points in space that define a triangle. I've also got a vertex buffer made up of three vertices, that also represent a triangle that I will refer to as a "model". How can I can I find the matrix M that will transform vertex in my buffer to those 3 points in space ? For example, let's say my three points A, B, C are at locations: A.x = 10, A.y = 16, A.z = 8 B.x = 12, B.y = 11, B.z = 1 C.x = 19, C.y = 12, C.z = 3 given these coordinates how can I build a matrix that will translate and rotate my model such that both triangles have the exact same world space ? That is, I want the first vertex in my triangle model to have the same coordinates as A, the second to have the same coordinates as B, and same goes for C. nb: I'm using instanced rendering so I can't just give each vertex the same position as my 3 points. I have a set of three points defining a triangle, and only three vertices in my vertex buffer.

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  • Question about design

    - by lukeluke
    Two fast questions about two design decisions: Suppose that you are checking collisions between game elements. When you find a collision between object 1 and object 2, do you play immediately a sound effect or do you insert it in a list and, in a later a stage, do you process all sound effects? Same question as above for user input. When the user presses key 'keypad left' do you insert the event in a queue and process it later or do you update character position immediately? Thx

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  • Client and Server game update speed

    - by user20686
    I am working on a simple two player networked asteroids game using XNA and the Lidgren networking library. For this set up I have a Lidgren server maintaining what I want to be the true state of the game, and the XNA game is the Lidgren client. The client sends key inputs to the server, and the server process the key inputs against game logic, sending back updates. (This seemed like a better idea then sending local positions to the server.) The client also processes the key inputs on its own, so as to not have any visible lag, and then interpolates between the local position and remote position. Based on what I have been reading this is the correct way to smooth out a networked game. The only thing I don’t get is what value to use as the time deltas. Currently every message the server sends it also sends a delta-time update with it, which is time between the last update. The client then saves this delta time to use for its local position updates, so they can be using roughly the same time deltas to calculate position updates. I know the XNA game update gets called 60 times a second, so I set my server to update the game state at the same speed. This will probably only work as long as the game is working on a fixed time step and will probably cause problems if I want to change that in the future. The server sends updates to clients on another thread, which runs at 10 updates per second to cut down on bandwidth. I do not see noticeable lag in movement and over time if no user input is received the local and remote positions converge on each other as they should. I am also not currently calculating for any latency as I am trying to go one step at a time. So my question is should the XNA client be using its current game time to update the local game state and not being using time deltas sent by the server? If I should be using the clients time delta between updates how do I keep it in-line with how fast the server is updating its game state?

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  • Fog with Blend in OpenGL

    - by MhdAljobory
    I want to add fog in my scene which contain transparent textures made by Blend , when i enable the fog the transparent textures appear white From a distance but when i disable it the textures appear well. What is the solution to the problem of whiteness? Fog Code: GLfloat fogColor[4]= {0.5f, 0.5f, 0.5f, 1.0f}; glClearColor(0.5f,0.5f,0.5f,1.0f); glFogi(GL_FOG_MODE, GL_LINEAR); glFogfv(GL_FOG_COLOR, fogColor); glFogf(GL_FOG_DENSITY, 0.35f); glHint(GL_FOG_HINT, GL_DONT_CARE); glFogf(GL_FOG_START, 1.0f); glFogf(GL_FOG_END, 1000.0f); glEnable(GL_FOG); Screenshot

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  • Determining whether two fast moving objects should be submitted for a collision check

    - by dreta
    I have a basic 2D physics engine running. It's pretty much a particle engine, just uses basic shapes like AABBs and circles, so no rotation is possible. I have CCD implemented that can give accurate TOI for two fast moving objects and everything is working smoothly. My issue now is that i can't figure out how to determine whether two fast moving objects should even be checked against each other in the first place. I'm using a quad tree for spacial partitioning and for each fast moving object, i check it against objects in each cell that it passes. This works fine for determining collision with static geometry, but it means that any other fast moving object that could collide with it, but isn't in any of the cells that are checked, is never considered. The only solution to this i can think of is to either have the cells large enough and cross fingers that this is enough, or to implement some sort of a brute force algorithm. Is there a proper way of dealing with this, maybe somebody solved this issue in an efficient manner. Or maybe there's a better way of partitioning space that accounts for this?

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  • System Requirement Checking

    - by gl3829
    I am working on a game and want to strengthen its requirement checking to ensure that it can run successfully. Therefore, I am looking for information on what is useful to check before starting the game. As a simple example, Why check for a specific amount of memory? Should I as a game developer ensure a minimum amount of memory? I feel this information is usually skipped in many books and resources but is critical to be able to deliver a game that will run on many machines. I would appreciate if you answered with what you check in the system, why you check it and if you have a good resource about it, please include. Just to be a bit more specific, I'm developing in Windows.

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  • Existent js libs for tileset / map loading and rendering?

    - by ylluminate
    I'm building an rts style overhead tileset game with JavaScript (particularly using Ember.js framework as a base). The map is so large that I'd very much like to be able to load and render the board and layered items in a Google Maps'esque. I'm curious as to whether there are existing libs that would be helpful and already well thought out in these regards vs trying to reinvent the wheel. Are there any such libraries or code examples that would be useful in this area of board / map management?

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  • Error when updating enumerated value?

    - by igrad
    Once upon a time, there was a Player class (simplified version) enum animState{RUNNING,JUMPING,FALLING,IDLING}; class Player { public: Player(int x, int y); void handle(); void show(); ~Player(); private: int m_x; int m_y; animState playerAnimState; } There was also a "handle" function-member, which took care of all movement and collisions for the player: #include "player.h" void Player::handle() { if(/*Player presses 'D' key*/) { m_x++; playerAnimState = RUNNING; } //Other stuff that is just there to look nice Through lots of experimentation with "//" and "/**/", I've found that I consistently get an error at "playerAnimState = RUNNING." Have I broken some enumeration rule? Does my laptop really suck that bad? I hate to post a "fix my code for me" question, but I'm not very seasoned with enums.

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  • background animation algorithm for single screen

    - by becool_max
    I’m writing simple strategy game (in xna), and would like to have an animated background. In my game all the actions happens inside one screen and thus standard parallax effect does not look appropriate. However, I found a video of a game with suitable background animation for my game http://www.youtube.com/watch?v=Vcxdbjulf90&feature=share&list=PLEEF9ABAB913946E6 (from 3 to 6s, while main character stays at the same place). What is the algorithm to do this stuff? It would be nice if someone can provide a reference for a similar example (language is not important).

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  • Wait for Unity 4.3? [on hold]

    - by RoarG
    We are currently in a pre-production of developing a 2d game in Unity but with the arrival of Unity 4.3 around the corner we were contemplating waiting for the release 4.3 instead of starting on 4.2, mainly since 4.3 got native 2d support. Is this something to be worried about, or do we need to start over to take use of the advantages that 4.3 brings, or does it matter at all? What benefits does one get in Unity 4.3, considering developing a 2d game? and is it a lot of tweaking to rework if we start the project before 4.3 release?

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  • What is "top new free" on GooglePlay

    - by Lumis
    On Android Market i.e. GooglePlay, there used to be a page with the latest new games. So every game had a chance to get noticed and make its way up especially if it was good. But now I see "top new free" page and no more the latest apps. I don't understand how can be "top new" Anybody knows how this works? If there are no more pages with the very latest uploaded games then the new apps will be barely seen to exist even if they are excellent, and new programmers have very little chance of getting noticed. Any good advice how to promote a new Android app these days?

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  • How to detect and collide two elastic line segments?

    - by Tautrimas
    There are 4 moving physical nodes in 3D space. They are paired with two elastic line segments / strings (1 <- 2; 3 <- 4). Part I: How to detect the collision of two segments? Part II: On the moment of collision, fifth node is created at the intersection point and here you have the force-based graph. 5-th node (bend point) can slide among the strings as in a real world. Given the new coordinates of 4 nodes, how to calculate the position of the 5-th node on the next frame? I assume string force on the nodes to be F = -k * x where x is the string length. All I came up to is that the force between 5 and 1 equals 5 and 2 (the same with 3 and 4). What are the other properties?.

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  • Android real time multiplayer over LAN

    - by Heigo
    I've developed several games for the android platform and now planning to create my first multiplayer game. What I have in mind is basically just a 2-player game witch you can play with 2 phones over local area connection/WiFi. Both phones need to be able to pass 3 integer values to the other phone in real time. So far I have considered using Socket's, but before I dig into it too deep I wanted to ask if there might be a better approach? Thanks!

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  • Android Java: Way to effectively pause system time while debugging?

    - by TheMaster42
    In my project, I call nanoTime and use that to get a deltaTime which I pass to my entities and animations. However, while debugging (for example, stepping through my code), the system time on my phone is happily chugging along, so it's impossible to look at, say, two sequential frames of data in the debugger (since by the time I'm done looking at the first frame, the system time has continued to move ahead by seconds or even minutes). Is there a programming practice or method to pause the system clock (or a way for my code to intercept and fake my deltaTime) whenever I pause execution from the debugger? Additional Information: I'm using Eclipse Classic with the ADT plugin and a Samsung SII, coding in Java. My code invoking nanoTime: http://pastebin.com/0ZciyBtN I do all display via a Canvas object (2D sprites and animations).

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  • Is it safe to run multiple XNA ContentManager instances on multiple threads?

    - by Boinst
    My XNA project currently uses one ContentManager instance, and one dedicated background thread for loading all content. I wonder, would it be safe to have multiple ContentManager instances, each in it's own dedicated thread, loading different content at the same time? I'm prompted to ask this question because this article makes the following statement: If there are two textures created at the same time on different threads, they will clobber the other and you will end up with some garbage in the textures. I think that what the author is saying here, is that if I access one ContentManager simultaneously on two threads, I'll get garbage. But what if I have separate ContentManager instances for each thread? If no-one knows the answer already from experience, I'll go ahead and try it and see what happens.

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