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  • Jumping a sprite while moving in a Bezier action

    - by marcg11
    I'm creating a game and I need the sprite to jump (move up and down basically) while it's moving on a bezier path so it moves vertically while it still follows the path. If I do this while it's moving along the bezier path: [mySprite runAction:[CCJumpBy actionWithDuration:0.1 position:ccp(0,0) height:10 jumps:1]]; It jumps vertically but instantly it returns to the position on the path. What I want is to jump relative to the path. Anyone knows something about it? It would looks something like this: the curve is a sequence of CCBezierBy's by the way. Thanks.

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  • Best way to handle realtime melee AI in authoritative network environment

    - by PrimeDerektive
    So i've been working on a multiplayer game for a bit; it's a co-op action RPG with real-time combat. If you've seen or played TERA, I'd say it's comparable to that, but not an MMO, heh. I'm currently handling the AI units authoritatively, the server calculates their pathing, movement, and pursue/attack logic, and syncs the movement to the clients 15x per second, and the state changes when they happen. When I emulate 200ms ping, though, the client can perceive being out of range to an AI's attack, but still take the hit, because on the server he hadn't moved that far yet. This also plays hell with my real-time blocking. I don't really want to allow the clients to be allowed to say "that was out of range" or "I blocked that", but I'm not really sure how else to handle it.

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  • What are cons of usage only non-member functions and POD?

    - by Miro
    I'm creating my own game engine. I've read these articles and this question about DOD and there was written to not use member functions and classes. I also heard some criticism to this idea. I can write it using member functions or non-member functions it would be similar. So what are benefits/cons of that approach or when project grows, does any of these approaches give clearer and better manageable code? With POD & non-member functions I don't have to make struct members public I can still use object id outside of engine like OpenGL does with all it's stuff, so It's not about encapsulation. POD - plain old data DOD - data oriented design

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  • J2ME character animation with multiple sprite sheets

    - by Alex
    I'm working on a J2ME game and I want to have walking animations. Each direction of walking has a separate sprite sheet (i.e. one for walking up, one for walking right etc), I also have a static idle image for each direction held together in a single file. I've tried to hold an array of sprites in my player class and then just drawing the sprite corresponding to the current direction, but this doesn't seem to work. I'm aware that if I combine all the animations into one sprite sheet I could set up different animation sequences, but I want to be able to do it with separate images for each animation. Is there a way that anyone knows of to achieve this? And ideally without too much extra code (as opposed to combining the sprites into one sheet)

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  • What is the XACT API?

    - by EddieV223
    I wanted to use DirectMusic in my game, but it's not in the June 2010 SDK, so I thought that I had to use DirectSound. Then I saw the XAudio2.h header in the SDK's include folder and found that XAudio2 is the replacement for DirectSound. Both are low-level. During my research I stumbled across the XACT API, but can't find a good explanation on it. Is XACT to XAudio2 what DirectMusic was to DirectSound? By which I mean, is the XACT API a high-level, easier-to-use API for playing sounds that abstracts away the details of XAudio2? If not, what is it?

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  • Material, Pass, Technique and shaders

    - by Papi75
    I'm trying to make a clean and advanced Material class for the rendering of my game, here is my architecture: class Material { void sendToShader() { program->sendUniform( nameInShader, valueInMaterialOrOther ); } private: Blend blendmode; ///< Alpha, Add, Multiply, … Color ambient; Color diffuse; Color specular; DrawingMode drawingMode; // Line Triangles, … Program* program; std::map<string, TexturePacket> textures; // List of textures with TexturePacket = { Texture*, vec2 offset, vec2 scale} }; How can I handle the link between the Shader and the Material? (sendToShader method) If the user want to send additionals informations to the shader (like time elapsed), how can I allow that? (User can't edit Material class) Thanks!

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  • XNA: SpriteFont question

    - by Zukki
    Hi everyone, I need some help with the SpriteFont. I want a different font for my game, other than Kootenay. So, I edit the SpriteFont xml, i.e: <FontName>Kootenay</FontName> or <FontName>Arial</FontName> No problem with Windows fonts, or other XNA redistributable fonts pack. However, I want to use other fonts, that I downloaded and installed already, they are TTF or OTF, both supported by XNA. My problem is, I cant use them, I got this error: The font family "all the fonts i tried" could not be found. Please ensure the requested font is installed, and is a TrueType or OpenType font. So, checking at the windows fonts folder, I check the properties and details of the fonts, I try all the names they have, and but never works. Maybe I need some kind of importing or installing in order to use them, I dont know, and I hope you guys can help me, thanks!

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  • How do I find the closest points(thereby forming a polygon) enclosing a particular point?(see image)

    - by nilspin
    I am working with a game engine, and my task is to add code for simulating fracture of rigid meshes. Right now I'm only working on breaking a cube. I am using Voronoi's algorithm to make a (realistic)fractured shard and I am using the half-plane method to generate a voronoi cell. Now the way I do this is for every seed point, I make planes that are perpendicular bisector planes(the straight black lines in the image) with rest of the seed points and I calculate the intersections of all these planes to give me distinct points(all the orange dots). I've gotten this far. Out of all these calculated intersection points, I only need the ones that are closest and enclosing the seed point(the points encircled in red) and I need to discard all the rest. Information that I have : 1) Plane equations of all planes(defined by normalized normal vectors and their distance from origin) 2) Points of intersection(that I've calculated) Can anybody help me find out how I can find the points encircled in red? Thanks.

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  • Simpler alternative to AngelScript

    - by Vee
    I want to give players the ability to create and share bullet patterns for a shoot'em up. The pattern scripts should have all the common programming stuff like loops, if/else, variables, and so on. But in the end, I just want them to call a "spawn bullet at X, Y with Z angle and A speed" in the C++ game. To spawn a circle of bullets, the user should only have to write a script with a for loop that goes from 0 to 360 and calls the spawn bullet function on every iteration. I tried integrating AngelScript, but I am getting nowhere - it looks way to complex for a simple task like this one. Is there an easy to integrate library that can solve my problem? Thanks.

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  • How do I tackle top down RPG movement?

    - by WarmWaffles
    I have a game that I am writing in Java. It is a top down RPG and I am trying to handle movement in the world. The world is largely procedural and I am having a difficult time tackling how to handle character movement around the world and render the changes to the screen. I have the world loaded in blocks which contains all the tiles. How do I tackle the character movement? I am stumped and can't figure out where I should go with it. EDIT: Well I was abstract with the issue at hand. Right now I can only think of rigidly sticking everything into a 2D array and saving the block ID and the player offset in the Block or I could just "float" everything and move about between tiles so to speak.

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  • Custom mesh format - yea or nay?

    - by Electro
    In the process of writing my game prototype, I have found the OBJ format to be insufficient for my needs - it does not support any sort of animation, it doesn't support triangle strips (I'm targeting my ancient hardware). MD2 wouldn't fit the bill because it doesn't have support for named model pieces. MD3 would probably work, but like OBJ, it doesn't have support for triangle strips. Considering the limitations of the formats above, I've come to the conclusion that it may be necessary to write my own format to accommodate my requirements, but that feels like reinventing the wheel. So, I need a format which can specify indexed tri-strips, supports textures, UV-mapping, collision data, can have multiple named segments and supports animations (have I forgotten anything?). Is there any format like that which already exists, or do I have to write my own?

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  • Render a 3D scene in multiple windows - extended panoramic view

    - by teodron
    Is there any resource location on how to view a 3D scene from an application or a game on multiple windows or monitors? Each window should continue drawing from where the neighbouring one left off (in the end, the result should be a mosaic of the scene). My idea is to use a camera for each window and have a reference position and orientation for a meta-camera object that is used to correctly offset the other camera. Since there are quite some elements to consider (window specs, viewport properties, position-orientation of each render camera), what is the correct way to update the individual cameras considering the position and orientation of the central, meta-camera? I currently cannot make the cameras present the scene contiguously (and I am reluctant in working out the transformations without checking whether this is the actual way of doing things).

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  • iOS persistant storage with update function

    - by jernej
    im developing a game which has different levels and i need to store all levels and its elements (position, image, sounds,..) into a file/database. The levels will be updated so i need a function that checks online for a update and downloads a database dump and additional files. I was planing to store all the persistent data into a SQLLite database, but not quite sure how to do the update part - to pack the database dump and the files together (in a .zip or with a xml). Can this be done any other way (as secure as possible)? thanks!

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  • Texture artifacts on iPad

    - by MrDatabase
    I'm porting an iPhone game to the iPad. When I move textures "quickly" (5.0 pixels every update at a rate of 60 Hz) I start to see little "artifacts" or remnants of where the texture used to be. I'm not sure if I know the correct terminology for this... imagine a texture at some location on the screen... then next to it is the same texture but faded a bit... then the same texture again just faded a bit more. I'm using CADisplayLink to drive my update loop if that helps. Also I didn't see this issue on the 3G or the iPhone 4. Any ideas? Cheers!

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  • Wheel Joint Implementation in AndEngine

    - by Siddharth
    I am currently developing car game in AndEngine. In which I was using revolute joint for car wheel and chassis attachment. But my friend suggest me that use wheel joint for that purpose for better behavior of the car. In AndEnginen I didn't found the wheel joint implementation. So what I have to do for wheel joint implementation. I think I have to manually update the box2d library for this purpose but I don't know how many things get updated. Please suggest me some guidance on achieving better car behavior in AndEngine.

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  • Detecting a ledge in Box2D

    - by DormoTheNord
    I'm making a 2D platformer with Box2D. The player needs to be able to grab onto a ledge and pull him/herself up. Right now I have a sensor that extends in every direction from the upper half of the player's body. The logic seems simple enough: if there are tiles inside the sensor and empty space above them, then it's a ledge and the game should act accordingly. The problem is that I can't figure out how to implement that logic with Box2D. Anyone have any ideas?

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  • Collision Detection fails with AI cars

    - by amit.r007
    I am making a car parking game in flash and AS3 wherein I drive my car along with other AI traffic cars moving along a specified path using Guidelines. I am using CDK for collision detection. The collision detection works fine with few AI cars, but doesn't seems to be working as required for few AI cars. When an AI car is moving on a path in a straight line it works fine.... but when the AI Car turns at 90 degress..... my car goes into the AI car (Overlapping) and it hits at the center of that AI car and then collision is Detected.... ..... I made a New path and used a new Sprite for AI car... but still the problem pursues....

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  • How was collision detection handled in The Legend of Zelda: A Link to the Past?

    - by Restart
    I would like to know how the collision detection was done in The Legend of Zelda: A Link To The Past. The game is 16x16 tile based, so how did they do the tiles where only a quarter or half of the tile is occupied? Did they use a smaller grid for collision detection like 8x8 tiles, so four of them make one 16x16 tile of the texture grid? But then, they also have true half tiles which are diagonally cut and the corners of the tiles seem to be round or something. If Link walks into tiles corner he can keep on walking and automatically moves around it's corner. How is that done? I hope someone can help me out here.

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  • How to model interentity membership in entity-component architecture?

    - by croxis
    I'm falling in love with simple grace of entity-component design, although I still have issues breaking from MVC and OOP practices. Some of my game entities have membership relationships with each other (ex: a player is a member of a city, a city is a member of a nation), and I am unsure on the best way to implement it. My initial reaction is to have a a MemberOfCity component that points to the appropriate city component, but components are suppose to have no references to each other. My other option is to have a System do it, but that would require the system to persist data outside of a component. Is there a clean way to do this in an entity-component design, or am I trying to use a hammer on a screw and should use a hybrid/another approach?

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  • Collision detection with entities/AI

    - by James Williams
    I'm making my first game in Java, a top down 2D RPG. I've handled basic collision detection, rendering and have added an NPC, but I'm stuck on how to handle interaction between the player and the NPC. Currently I'm drawing out my level and then drawing characters, NPCs and animated tiles on top of this. The problem is keeping track of the NPCs so that my Character class can interact with methods in the NPC classes on collision. I'm not sure my method of drawing the level and drawing everything else on top is a good one - can anyone shed any light on this topic?

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  • How to emulate Mode 13h in a modern 3D renderer?

    - by David Gouveia
    I was indulging in nostalgia and remembered the first game I created, which used Mode 13h. This mode was really simple to work with, since it was essentially just an array of bytes with an element for each pixel on the screen (using an indexed color scheme). So I thought it might be fun to create something nowadays under these restrictions, but on modern hardware. The API could be as simple as: public class Mode13h { public byte[] VideoMemory = new byte[320 * 200]; public Color[] Palette = new Color[256]; } Now I'm wondering what would be the best way to get this data on the screen, using something like XNA / DirectX / OpenGL. The only solution I could think of was to create a texture with the same size as the VideoMemory array, write the contents of VideoMemory to it every frame, then render that texture in a full screen quad with the correct aspect ratio and using point texture filtering for that retro look. Is there a better way?

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  • Pokemon Yellow wrap transitions

    - by Alex Koukoulas
    So I've been trying to make a pretty accurate clone of the good old Pokemon Yellow for quite some time now and one puzzling but nonetheless subtle mechanic has puzzled me. As you can see in the uploaded image there is a certain colour manipulation done in two stages after entering a wrap to another game location (such as stairs or entering a building). One easy (and sloppy) way of achieving this and the one I have been using so far is to make three copies of each image rendered on the screen all of them with their colours adjusted accordingly to match each stage of the transition. Of course after a while this becomes tremendously time consuming. So my question is does anyone know any better way of achieving this colour manipulation effect using java? Thanks in advance, Alex

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  • Render 3d object to 2d surface (embedded system)

    - by Martin Berger
    i am working on an embedded system of a sort, and in some free time i would like to test its drawing capabilities. System in question is ARM Cortex M3 microcontroller attached to EasyMX Stellaris board. And i have a small 320x240 TFT screen :) Now, i have some free time each day and i want to create rotating cube. Micro C PRO for ARM doesnt have 3d drawing capabilities, which means it must be done in software. From the book Introduction to 3D Game Programming with DirectX 10 i know matrix algebra for transformations but that is cool when you have DirectX to set camera right. I gues i could make 2d object to rotate, but how would i go with 3d one? Any ideas and examples are welcome. Although i would prefer advices. I'd like to understand this.

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  • Numerical stability in continuous physics simulation

    - by Panda Pajama
    Pretty much all of the game development I have been involved with runs afoul of simulating a physical world in discrete time steps. This is of course very simple, but hardly elegant (not to mention mathematically inaccurate). It also has severe disadvantages when large values are involved (either very large speeds, or very large time intervals). I'm trying to make a continuous physics simulation, just for learning, which goes like this: time = get_time() while true do new_time = get_time() update_world(new_time - time) render() time = new_time end And update_world() is a continuous physical simulation. Meaning that for example, for an accelerated object, instead of doing object.x = object.x + object.vx * timestep object.vx = object.vx + object.ax * timestep -- timestep is fixed I'm doing something like object.x = object.x + object.vx * deltatime + object.ax * ((deltatime ^ 2) / 2) object.vx = object.vx + object.ax * deltatime However, I'm having a hard time with the numerical stability of my solutions, especially for very large time intervals (think of simulating a physical world for hundreds of thousands of virtual years). Depending on the framerate, I get wildly different solutions. How can I improve the numerical stability of my continuous physical simulations?

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  • PHP city-sim castle layout

    - by Gert
    I am currently contemplating the layout system for my php based game but i've run into a couple of worries. So my idea is a 9X9 grid where the center 3X3 are inner castle. The inner castle will be 6X6 if you enter it(click on it). and with the option to expand the inner castle converting one of the 9X9 tiles to a 4X4 inner castle tile. So here is my question: What is the best way to tackle this type of layout? my original idea was a 18X18 grid and saving it in the db as (idCastle, Y, X) where X is a string of 18 numbers long telling me if the tile is an inner/outer tile or a inner/outer building. but i am not really fond of this idea and would like to hear some other ideas on how to tackle this. Thanks in Advance, Gert

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