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  • Can i add friction in air?

    - by Diken
    I have issue regarding speed in air. When i jump and move simultaneously that time speed of player increase.For jump i am using impuls and for movement i am using force.I want to slow speed when player is in air. Thanks in advance Following is my update method ih HUDLayer -(void)update:(ccTime)dt :(b2Body *)ballBody :(CCSprite *)player1 :(b2World *)world { if (moveRight.active==YES) { ballBody->SetActive(true); b2Vec2 locationworld=b2Vec2(maxSpeed,0); double mass=ballBody->GetMass(); ballBody->ApplyForce(mass*locationworld, ballBody->GetWorldCenter()); // ballBody->SetLinearDamping(1.2f); } else if(moveLeft.active==YES) { ballBody->SetActive(true); b2Vec2 locationworld=b2Vec2(-10,0); double mass=ballBody->GetMass(); ballBody->ApplyForce(mass*locationworld, ballBody->GetWorldCenter()); // ballBody->SetLinearDamping(1.2f); } } Following is jump -(void)jump:(b2Body*)ballBody:(ccTime)dt:(BOOL)touch { if (touch) { if (jumpSprte.active==YES) { ballBody->SetActive(true); b2Vec2 locationWorld; //locationWorld=b2Vec2(0.0f,98.0f); locationWorld=b2Vec2(0,32); // double mass=ballBody->GetMass(); ballBody->ApplyLinearImpulse(locationWorld, ballBody->GetWorldCenter()); // ballBody->ApplyForce(mass*locationWorld, ballBody->GetWorldCenter()); ballBody->SetLinearDamping(1.2f); } } } So where i apply logic??

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  • Collision for mobile game

    - by zemiguel12
    I'm writing a little game in as3 using Starling, and I need to check collision between 2 boats that can rotate. I don't need the pixel perfect collision, but bounds collision is not enough too. The boat look more or less like this: I was thinking about create one square on the back of the boat and a triangle on the front, than for each boat, check if the square collide with the other boat square or triangle, and the same for the triangle. I just don't know how to do that, I don't know if it's possible with the Shape.hitTest, or if it's the best way to do that. What can I do?

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  • Java and Eclipse setup properly, how do I install JOGL or LWJGL?

    - by shadowprotocol
    I have my Java environment installed alongside Eclipse, and I was successfully able to create and run a new project (simple System.out.println("Yay I work!"); I have the OpenGL SuperBible, and I primarily want to code 3D things (I'll take my time using the book to learn how to draw shapes in 3D space, etc..) Can you help me get setup with OpenGL in Java? I dont really need LWJGL, although I WILL make games eventually. I just can't even figure out with all of these terrible (and old) tutorials floating around on the net how to install either JOGL or LWJGL. If you can give me a hand with that, I'd appreciate it. I'd like to feel I contributed by having this page show the answer to the question, so that other poor souls googling for this same information can benefit.

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  • C++ Database vs Reading Files

    - by Ohmages
    Ive been programing a C++ game/server for the past year. I have been using MYSQL for character logins, items, monsters, etc, etc. (im on windows). My question is, what are some of the databases that some big time developers use. IE. Battle.net, Diablo II, Diablo III, mythos, hellgate , etc, etc, etc. Do they have their own database they built? Or do they use an existing framework for logins, and character transfers. I do know that in diablo II, they use character files to to transfer characters into the game world. But what about the login into battle.net. Would it be wiser for me to stick with MYSQL, or is there something out there faster and more stable, or should I create a login type of system that looks through a file to see if you provided the correct password. Can't wait to get some replies. Thanks! PS. Currently the framework is much like battle.net, where you login into a lobby, create, and join games. The game server/lobby server are different servers too. So im just wondering about the lobby server for logins because I'm expecting several hundred thousand connections/logins.

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  • How to find collision detection side between two objects?

    - by user2362369
    I am using box2D and I have two objects, one is bouncy ball and the other one is block. I'd like to find which side of the block is collided with, so I can only make the ball bounce when it hits the top. I tried to implement many things like fixture data and by detecting position, using manifold but not get the accurate result. I also tried to calculate distance between two object but all went wrong.

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  • I want to begin in this world, where can i meet information,help and people to start? [on hold]

    - by SYNOXYS
    So like the question says, I really want to begin to create something,or help creating something. I mess around with some 2d and 3d softwares like unity,gamemaker,UE... and tried to modelate (maya,3dmax),I use them a little,nothing professional, but all i've got is the sensation that i can't go really far. I feel like i am learning really slow, even having the will and some basics knows. But I want to change that, i want to really learn, to progress. I think that a good idea is meeting people like me, and start a non-commercial project or something. Thanks for your time,really. Greetings, SYNOXYS.

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  • Entity System and rendering

    - by hayer
    Okey, what I know so far; The entity contains a component(data-storage) which holds information like; - Texture/sprite - Shader - etc And then I have a renderer system which draws all this. But what I don't understand is how the renderer should be designed. Should I have one component for each "visual type". One component without shader, one with shader, etc? Just need some input on whats the "correct way" to do this. Tips and pitfalls to watch out for.

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  • SDK mouse relative motion, weird results

    - by zaftcoAgeiha
    I have a simple SDL application that tracks the relative change in mouse position But for some reason, the motion.xrel and motion.yrel give back massive numbers! my code: SDL_WM_GrabInput(SDL_GRAB_ON); SDL_ShowCursor(false); while(!quit){ // Draw the scene if (invalidated == 1){ on_render(); invalidated = 0; } // And poll for events SDL_PumpEvents(); SDL_Event event; while ( SDL_PollEvent(&event) ) { switch (event.type) { case SDL_KEYDOWN: case SDL_KEYUP: on_key(event.key); break; case SDL_MOUSEMOTION: std::cerr << event.motion.xrel << ":" << event.motion.yrel << std::endl; invalidated = 1; break; ... and the printed results are ridiculous: 400:300 -11297:1705 -11215:1268 -10969:940 -10314:-43 -9986:-698 -9331:-1681 -9003:-2227 -8593:-2664 -8020:-3538 -7774:-3647 -7365:-4193 -7283:-4302 -7119:0 any idea why?? System is Ubuntu 12 running in virtual box

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  • Is it legal to develop a game usung some version of D&D, something similar to Baldurs Gate?

    - by Max
    For a while now I've been thinking about trying my hand at creating a game similar in spirit and execution to Baldurs Gate, Icewind Dale and offshoots. I'd rather not face the full bulk of work in implementing my own RPG system - I'd like to use D&D rules. Now, reading about the subject it seems there is something called "The License" which allows a company to brand a game as D&D. This license seems to be exclusive, and let's just say I don't have the money to buy it :p. Is it still legal for me to implement and release such a game? Commercially or open-source? I'm not sure exactly which edition would fit the best, but since Baldurs Gate is based of 2nd edition, could I go ahead an implement that? in short: what are the issues concerning licensing and publishing when it comes to D&D? Also: Didn't see any similar question...

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  • How can I implement smooth rotation from one direction to another?

    - by user1759052
    I'm having a problem with animating rotations with 1Matrix.CreateRotationY() with my basic 3D game. Based on where you click the mouse, I want the 3D object to rotate to that direction and then move. I am using this to determine the target direction: float rot = (float)(Math.Atan2(X, Z)); It gives me the correct value, but I am not sure how to handle the rotation animation from current direction to new direction. I've tried a few things, but to no avail. Do you guys know of any good ways of solving this issue?

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  • How to create a map-like (clouds) texture [duplicate]

    - by user16547
    This question already has an answer here: How do you generate tileable Perlin noise? 9 answers If you place a map of the world on a sphere, it will look like the image is continuous. Basically the left end of the image is sort of a continuation of the right end. You won't be able to see any cuts. I'm trying to create a clouds texture to add to my planet such that it will seem it has clouds. I managed to create the clouds in GIMP, however, I can't figure out how to make sure the left end of my image is a smooth continuation of the right end. For example if you were to map the below image to your sphere (I removed transparency to make it clearer), there would be a very obvious transition from the right end of the image back to the left end on your sphere. How would I create a texture such that I get rid of that? Sorry for my lack of terminology.

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  • Placing items randomly in a dynamically generated terrain

    - by Programlocura
    I'm currently working on a 'Tiny wings' like game. I've already asked about the angle of the items in curved lines and i solved (thank you for responses),i'm currently placing the items in random positions, but the terrain it's dynamically and i don't get this working. I've a vector with the points of the terrain, and i'm doing something similar to this (Iterating trough vector): if( _SPManager && i % 15 == 0 && i != 0 ) { if ( _settings.specialPoints && _currentPoints < _settings.specialPoints ) { _SPManager.addPoint( _hillsPosition[i].x , _hillsPosition[i].y ); _currentPoints++; } } But it isn't working as i expected. It isn't displaying the right number of items (Always shows less than i specified). How do i should place the items? Thanks :)

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  • C++ game programming

    - by UnTraDe
    Until now I have been using C# with XNA for 2d and a little bit of 3d games, althought I dont remember that I finished any of them I want to start working with C++. I have a very very little exprience with C++ and my question is where to start? I plated a little bit with SFML and I encountered some problems with performance when I started to build a tile based game. I'm pretty sure that the problem is my code and not the library itself. Is there anything similiar to XNA for C++? I should keep try and work with SFML? Sorry for my bad english! Thanks in advance!

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  • Make the player run onto stairs smoothly

    - by misiMe
    I have a 2D Platform game, where the player Always runs to the right, but the terrain isn't Always horizontal. Example: I implemented a bounding-box collision system that just checks for intersections with player box and the other blocks, to stop player from running if you encounter a big block, so that you have to jump, but when I put stairs, I want him to run smoothly just like he is on the horizontal ground. With the collision system you have to jump the stairs in order to pass them! I thought about generating a line between the edges of the stairs, and imposing the player movement on that line... What do you think? Is there something more clever to do?

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  • Basic/research RTS engine/model

    - by XTF
    Does a basic/research RTS engine/model exist that can be used as a basis for further experimentation/research? I'd like to avoid reinventing the wheel if possible. I'm aware of Spring Engine and Stratagus, but those are real game engines and may not be the best to experiment with and learn from. Ideally the docs for the model would answer questions like: How exactly do units move? (constant velocity? constant acceleration? constant force?) How is pathfinding handled? Does every grid cell become an A* graph node (may be expensive)? Does it consider threats? How are groups handled? (w.r.t pathfinding and movement) How is combat handled? I'm mostly interested in the low-level model details (for now), not the graphics etc. I've read a lot of the other quesions (and answers/references) tagged RTS but I haven't found my answer yet.

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  • Scene or Activity Animation

    - by Siddharth
    My game require an animation when one activity finishes and next started because I have develop game with multiple activity not as multiple scene per game. I have to show animation at the time of activity creation and activity destroy. I have trying to create basic animation that was supported by android. And all that xml file I have to post it into the anim folder but the loading of resource was so much high so any type of animation I provide using android method does not work for me it look weird. If scene class has some functionality for animation that please know me then I try to load different type of animation using scene. I have not create multiple scene because I have no awareness about how to manage multiple scene in andengine though I have a working experience of 8 months in andengine. So this help also provide me a great help. Basically I want to create animation like one activity slide out at the same time the other activity slide in. So at a time user can see the transition of activity. Thanks in advance.

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  • Which optional features would you recommend for a raytracer? [closed]

    - by locks
    I'm developing a basic triangle mesh raytracer on a short deadline. This means I can't implement every feature I come across, so I'm looking for some feedback about which features you think are most important, taking into consideration the performance of the feature and how much punch it packs. I'm especially looking for optimization techniques that allow for a faster rendering and simple techniques that make a big impact on the final scene quality. Is there any chance of making it fast enough to run in realtime? Here are some example of features I've read about: Anti-aliasing Bounding box Sky box

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  • android application that visualize real time data

    - by matarsak
    I want to build and android app that visualize real time data , I set up a UDP channel that get the data , now I want to visualize it . I now that I can use openGL ES. but I have now back ground and in a few weeks I dont think that i'm able to learn that . what about android processing ? could it be used for extensive visualization task like this? or it's limited ? I heard it's not hard to learn that. any other option ?

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  • How to handle class dependency with interfaces and implementatons

    - by lealand
    I'm using ObjectAid with Eclipse to generate UML class diagrams for my latest Java project, and I currently have a handful of situations like this, where I have a dependency between two interfaces, as well as one of the implementations of one of the interfaces. Here, foo is the graphics library I'm using. In the previous example, FooCanvas draws ITexture objects to the screen, and both FooCanvas and its interface, ICanvas, take ITexture objects as arguments to their methods. The method in the canvas classes which cause this dependency is the following: void drawTexture(ITexture texture, float x, float y); Additionally, I tried a variation on the method signature using Java's generics: <T extends ITexture> void drawTexture(T texture, float x, float y); The result of this was a class diagram where the only dependencies where between the interfaces and the implementing classes, and no dependency by a canvas object on a texture. I'm not sure if this is more ideal or not. Is the dependency of both the interface and implementation on another interface an expected pattern, or is it typical and/or possible to keep the implementation 'isolated' from its interfaces dependencies? Or is the generic method the ideal solution?

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  • Intuitive "Take Screenshot" key mapping used by games?

    - by Hatoru Hansou
    I recently had a problem testing my game on Linux Ubuntu. The Print key is intercepted by the desktop environment and It never reaches the game. Rather than fighting this, I will simply use any other key or key combination to trigger the screen capture functionality. Now, using the PRINT key is very intuitive because people already expect this behavior. What other keys are a good idea to use to take screenshots? And if possible elaborate why, have other apps/games used that key?

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  • How should game objects with fixed positions in the world be positioned?

    - by mars
    I have some game objects that are always at the same position in my game world as they make up some of the scenery of my puzzle game. At the moment, their positions are sort of hard coded in and some of their positions are calculated relative to the hard coded positions of other objects at the time of game initialization. This has been hard to maintain because whenever I've decided to change the position of these scenery objects as the game design evolved, I have to go and rewrite parts of the code that place the created objects and calculate their positions in the world. Is there a more maintainable way of handling the positioning of fixed game objects?

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  • STL for games, yea or nay?

    - by munificent
    Every programming language has its standard library of containers, algorithms, and other helpful stuff. With languages like C#, Java, and Python, it's practically inconceivable to use the language without its standard lib. Yet, on many C++ games I've worked on, we either didn't use the STL at all, used a tiny fraction of it, or used our own implementation. It's hard to tell if that was a sound decision for our games, or one simply made out of ignorance of the STL. So... is the STL a good fit or not?

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  • Implementing hitbox polygon

    - by Delusional Logic
    I'm creating a shooter, it's still very early, but i'm implementing some polygon hitboxes. So far i have created a polygon class, and i'm looking into how i can hook it onto my player. I'm trying to stay away from having a Tick() function in my polygon class, and I would rather not update the position every tick (it would clutter up my tick functions). At the same time I would really like to have the positions in there somehow (it has a drawing function, and i will be using it for hit detection) How would i go about implementing this polygon object into my entities?

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  • Saving to a file in C# [on hold]

    - by user36322
    If I use this code: using (StreamWriter streamWriter = new StreamWriter("Content/player.txt", true)) { streamWriter.Write("Hello!"); streamWriter.Close(); } The program will not actually add "Hello!" to the file. However, if I use this code: using (StreamWriter streamWriter = new StreamWriter("C:/Users/Michael/Documents/Visual Studio 2010/Projects/PuzzleGame/PuzzleGame/PuzzleGameContent/player.TXT", true)) { streamWriter.Write("Hello!"); streamWriter.Close(); } The program will work as intended and add "Hello!" to the save file. Is there any way I can do this without hardcoding the path?

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  • Game programming and quantity of timers

    - by andresjb
    I've made a simple 2D game engine using C# and DirectX and it's fully functional for the demo I made to test it. I have a Timer object that uses QueryPerformanceCounter and I don't know what's the better choice: use only one timer in the game loop to update everything in the game, or an independent timer in every object that needs one. My worry is that when I try to implement threads, what will happen with timers? What happens with the sync?

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