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• How to update a mesh position base on a pressed key?

  - by steven166

  I have a mesh loaded from a file, like a tiger mesh. At the first time it locates at A position, then if I press a left key, it will moves to B position but the problem is if I press a left key one more time, it will move from B position to C position. It means that the amount I want to move the mesh will base on the current position instead of the first time rendering position. I can do it if I have a array vertices then I just update the vertex buffer, but a mesh loaded from a file does not have an array vertices, so how to do it? Anybody help me, please?

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• Whats the right program for me?

  - by andyphillips20

  I would like to learn C++ so I can get a job in the game industry, but there are so many options it a little confusing. I know most of you will say I should read up on C++ before attempting to program it but I learn best by doing things rather then reading. That being said I don't understand some of the thing suggested on other questions, because I've read a few trying to find whats right for me, so putting things in the simplest terms would be helpful. I've been making a couple of games 2d using gamemaker and if theres a C++ equivalent that would be perfect, but if not possible I would like an IDE that allows me to easily continue making 2d games, and is fairly simple to learn. Having a 2d sprite editor would be a nice plus but I can understand if its not every thing I want in one program

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• Basic Use of ApplyImpulse

  - by nycynik

  I am trying to apply a force to a bunch of b2_dynamicBodys, but it seems to only work for a random number of items and then stops with an error. //create some items to move bodyDef.type = b2Body.b2_dynamicBody; for(var i = 0; i < 5; ++i) { fixDef.shape = new b2PolygonShape; fixDef.shape.SetAsBox(1,1); fixDef.friction = 1; fixDef.restitution = .1; bodyDef.position.x = Math.random() * 10; bodyDef.position.y = Math.random() * 10; bodyDef.linearDamping=1; bodyDef.angularDamping=.8; itemsArray.push(world.CreateBody(bodyDef).CreateFixture(fixDef)); // store for later } then i try to apply a force later with: angle = 20; for (var xIdx=0; xIdx<itemArray.length; xIdx++) { itemsArray[xIdx].GetBody().ApplyImpulse(new b2Vec2(50*Math.cos(angle*Math.PI/180),50*Math.sin(angle*Math.PI/180));); } the error I receive is TypeError: 'undefined' is not an object (evaluating 'c.x') Is there something wrong with saving the items for later use when I am creating them? Does anyone know what is causing this.

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• Settlers-like terrain representation

  - by Olle

  Remember this beauty? I'm playing it now on my old Amiga 1200. My question is: How do you think they represented the terrain, data structure wise? Obviously it's some kind of points, with a height. Or hexagons. And how did they decide which dots were buildable? EDIT: I could rephrase the question to say "how do I achieve this kind of terrain", but I would still only be interested in how to do it on a machine with 1 MB of RAM and a 7 Mhz processor, because this is the machine i currently developing games for. If that seems like a vague or meaningless question to you, that's alright, but I'm still curious if someone has any knowledge about this.

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• Help me choose an engine

  - by Gjorgji

  So far i've been trying to make a RTS in pygame but, i feel like 2d is not enough and pygame has me do a lot of stuff that i would not like doing. What i would like doing is working on the AI gameplay and such and not worying too much about how to display stuff,physics and the like too much. So far Unity has boo which is supposed to be similar to python i wonder if that could work. How similar is it to python should i use this? Other options as far as i can see are ogre3d python bindings and UDK. Which would best suit my needs?

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• Any faster method?

  - by rajeshverma423

  Manhattan distance is used to the center in chess code that uses an 0x88 board . 0x88 board is 128 square. public static final byte DISTANCE[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 0, 0, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 3, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 4, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 5, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 6, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; Is there any other faster method instead of 0x88 to find distance?

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• Saving files with libgdx

  - by Rudy_TM

  Writing my game in libgdx, i arrived at the point when i need to save the player stats and the info of the levels, but in libgdx its not allowed to write the file inside folder of the application, only external (in the sd) is allowed, well, the point is that i want that my new file cat be seen by anyone, or if they see it how can i pass it to a binary file, so no one can see it. I just want to hide the file :P

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• Vector normalization gives very imprecise results

  - by Kipras

  When I normalize vectors I receive very strange results. The lengths of the normalized vectors range from 1.0 to almost 1.5. The functions are all written by me, but I just can't find a mistake in my algorithm. When I normalize I just divide all components of the vector by the vector's length. public double length(){ return Math.sqrt(x*x + y*y); } public void normalize(){ if(length() > 0){ x /= length(); y /= length(); } } Is this supposed to happen? I mean I can see the length ranging from 0.9 to 1.1 at worst, but this is just overwhelming. Cheers

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• Actionscript - Dropping Multiple Objects Using an Array? [closed]

  - by Eratosthenes

  Possible Duplicate: Actionscript - Dropping Multiple Objects Using an Array? I'm trying to get these fireBalls to drop more often, im not sure if im using Math.random correctly also, for some reason I'm getting a null reference because I think the fireBalls array waits for one to leave the stage before dropping another one? this is the relevant code: var sun:Sun=new Sun var fireBalls:Array=new Array() var left:Boolean; function onEnterFrame(event:Event){ if (left) { sun.x = sun.x - 15; }else{ sun.x = sun.x + 15; } if (fireBalls.length>0&&fireBalls[0].y>stage.stageHeight){ // Fireballs exit stage removeChild(fireBalls[0]); fireBalls.shift(); } for (var j:int=0; j<fireBalls.length; j++){ fireBalls[j].y=fireBalls[j].y+15; if (fireBalls[j].y>stage.stageHeight-fireBall.width/2){ } } if (Math.random()<.2){ // Fireballs shooting from Sun var fireBall:FireBall=new FireBall; fireBall.x=sun.x; addChild(fireBall); fireBalls.push(fireBall); } }

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• Why doesn't this ContentLoader project (VS2010 e) recognize Microsoft.Build.dll?

  - by IAbstract

  I am working with an XNA content loader sample. In the references for the project (VS 2010 Express) there are: Microsoft.Build Microsoft.Build.Framework //as well as the standard XNA framework and graphics references To emulate this project, I am trying to first add a reference to Microsoft.Build.dll. But Visual Studio warns me that it cannot load the .dll. I looked at MSDN and the document referenced Microsoft.Build.Evaluation. This is suppose to be available in the Microsoft.Build.dll and then I'll have access to the Project class. Has anyone had any experience with this?

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• speed up the update of glutidle()

  - by CroCo

  I have a client that sends data at 1KHz (i.e. 0.001 sec) to a master over Internet using UDP protocol. In Master, I need to draw an object, but the problem is that the update of GLUT is slower than the client's update. I have tried to use glutTimerFunc(0,glutIdle, 0); but still slow. Is there a way to speed up the update rate of drawing? I need to update Display() every 0.001 sec. Any suggestions? I'm using windows 7.

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• Simulating water droplets on a window

  - by skyuzo

  How do I simulate water droplets realistically falling, gathering, and flowing down a window? For example, see http://www.youtube.com/watch?v=4jaGyv0KRPw. In particular, I want to simulate how smaller droplets merge together to form larger droplets that have enough weight to oppose the surface tension and flow downward, leaving a trail of water. I'm aware of fluid simulation, but how would it be applied in this situation?

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• Where can I find some Cocos2dx beginner tutorials?

  - by Skeith

  I have tried to start programing with Cocos2dx but I have no idea where to start and the tutorials are no very not very helpful. What I am looking for is some tutorials/guides on how to begin using cocos2dx for the total beginner. Things like how to setup a project and run it and how to do simple things like draw graphics on the screen, play sounds and get input. I am running on windows 7 and have been told by the Cocos2dx wiki that this may cause problems so if anyone has a solution to this that would also be helpful.

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• Random generation of interesting puzzle levels?

  - by monsterfarm

  I'm making a Sokoban-like game i.e. there's a grid that has some crates on it you can push and you have to get the crates on crosses to win the level (although I'm going to add some extra elements to it). Are there any general algorithms or reading material I can look at for how I could go about generating interesting (as in, not trivial to solve) levels for this style of game? I'm aware that random level generators exist for Sokoban but I'm having trouble finding the algorithm descriptions. I'm interested in making a game where the machine can generate lots of levels for me, sorted by difficulty. I'm even willing to constrain the rules of the game to make the level generation easier (e.g. I'll probably limit the grid size to about 7x7). I suspect there are some general ways to do level generation here as I've seen e.g. Traffic Jam-like games (where you have to move blocks around the free some block) with 1000s of levels where each one has a unique solution. One idea I had was to generate a random map in its final state (i.e. where all crates are on top of their crosses) and then the computer would pull (instead of push) these crates around to create a level. The nice property here is that we know the level is solvable. However, I'd need some heuristics to ensure the level was interesting.

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• cocos2dx beginner tutorials

  - by Skeith

  I have tried to start programing with coco2dx but i have no idea where to start and the tutorials are no very not very helpful. What i am looking for is some tutorials/guides on how to begin using cocos2dx for the total beginner. Things like how to setup a project and run it and how to do simple things like draw graphics on the screen, play sounds and get input. I am running on windows 7 and have been told by the cocos2dx wiki that this may cause problems so if anyone has a solution to this that would also be helpful.

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• What is realism?

  - by eversor

  Beyond the obvious something that seams real, realism in games is a hard feature to hit. In some cases, things that are completely impossible in real life are seen as realistic by gamers. For instance, in some FPS you can survive being hit by a fair amount of bullets when in real life one is enough, Newton-defying car drifts, etc. So, in some cases, reductions of life-like actions or consequences implies a bigger sense of realism. The root of this pseudo-philosophical question lies in: I am going to create a engine for battles in an online (browser-based) strategic game. Browser-based means that the battle would not be seen. And i do not know how to approach this realism issue.

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• UDK: Toggle Material on Brushes?

  - by user50300

  I'm attempting to change / toggle the material that's applied to a BSP brush. I've seen where it's possible on static meshes, but I can't seem to get it to work on brushes. Below is an example scenario. The ground (BSP Brush) is covered in a stone material The player hits a trigger. A new "moss" material is applied to the brush, removing the old stone material. Any assistance you could offer would be greatly appreciated.

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• CCMoveBy values on update()

  - by Jose M Pan

  Hope you can help me. This is my problem: I have a scheduled update, here I track the movements of my objects (sprites), I move them with CCMoveBy, and I need to constantly update the zOrder. For setting the zOrder I've made a setZOrder(), which it takes the actual position of the sprite. And here is the problem, I get all the X and Y values AFTER the object is in the target. I know I get the values after the object is in the new position because I've made a CCLog. I can read all the values from the sprite, only when it's in the new position, so everything is well sorted only when the objects are not moving. How can I get the CCMoveBy values on every tick update? (or how can I get the CCMoveBy values in "real-time"?) Thanks a lot in advance, Here is an idea of my code. this->schedule(schedule_selector(Game::update)); void Game::update(float dt) { setZOrder(); moveObjects(); } void Game::setZOrder() { //This function takes the X and Y position and the row and column where the sprite is. Is working good. But I'm getting the "move" action values, after the object is in place. } void Game::moveObjects() { for (i=0; i < numChildren; i++) { CCActionInterval* move = CCMoveBy::create(targetPoint, time); object[i]->runAction(move); } }

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• What is the best way to manage large 3d worlds (i.e minecraft style)?

  - by SomeXnaChump

  After playing minecraft I was marvelling a bit at their large worlds but at the same time finding it extremely slow to navigate, even with a quad core and meaty graphics card. Now I assume its fairly slow because: A) Its written in Java, and as most of the actual spatial partitioning and other memory management activities happen in there it would be slower than a native C++ version. B) They are not partitioning their world very well I could be wrong on both assumptions, however it got me thinking about the best way to manage large worlds. As it is more of a true 3d world, where a block can exist in any part of the world, it is basically a big 3d array [x][y][z], where each block in the world has a type (i.e BlockType.Empty = 0, BlockType.Dirt = 1 etc). Now I am assuming to make this sort of world performant you would need to: a) Use a tree of some variety (oct/kd/bsp) to split all the cubes out, it seems like an oct/kd would be the better option as you can just partition on a per cube level not a per triangle level. b) Use some algorithm to work out if the blocks within the scene can currently be seen, as blocks closer to the user could obfuscate the blocks behind, making it pointless to render them. c) Keep the block object themselves lightweight, so it is quick to add and remove them from the trees I guess there is no right answer to this, but I would be interested to see peoples opinions on the subject.

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• Attach my sprite with Box2d

  - by user919496

  I'm coding Javascript(HTML5) with Box2D. And I want to ask how to attach Sprite with Box2D. This is function My sprite: function My_Sprite() { this.m_Image = new Image(); this.m_Position = new Vector2D(0,0); this.m_CurFrame = 0; this.m_ColFrame = 0; this.m_Size = new Vector2D(0,0); this.m_Scale = new Vector2D(0,0); this.m_Rotation = 0; } My_Sprite.prototype.constructor = function (_Image_SRC) { this.m_Image.src = _Image_SRC; } My_Sprite.prototype.constructor = function (_Image_SRC,_Size,_Col) { this.m_Image.src = _Image_SRC; this.m_Size = _Size; this.m_ColFrame = _Col; this.m_Scale = new Vector2D(1, 1); } My_Sprite.prototype.Draw = function (context) { context.drawImage(this.m_Image, this.m_Size.X * (this.m_CurFrame % this.m_ColFrame), this.m_Size.Y * parseInt(this.m_CurFrame / this.m_ColFrame), this.m_Size.X, this.m_Size.Y, this.m_Position.X, this.m_Position.Y, this.m_Size.X * this.m_Scale.X, this.m_Size.Y * this.m_Scale.Y ); } and this is function Object : function Circle(type, angle, size) { // Circle.prototype = new My_Object(); // Circle.prototype.constructor = Circle; // Circle.prototype.parent = My_Object.prototype; this.m_den = 1.0; this.m_fri = 0.5; this.m_res = 0.2; fixDef.density = this.m_den; fixDef.friction = this.m_fri; fixDef.restitution = this.m_res; fixDef.shape = new b2PolygonShape; bodyDef.type = type; bodyDef.angle = angle; bodyDef.userData = m_spriteCircle; fixDef.shape = new b2CircleShape( Radius / SCALE //radius ); this.m_Body = world.CreateBody(bodyDef); this.m_Body.CreateFixture(fixDef); m_spriteCircle = new My_Sprite(); this.Init(); } Circle.prototype.Init = function () { m_spriteCircle.constructor("images/circle.png", new Vector2D(80, 80), 1); m_spriteCircle.m_CurFrame = 0; } Circle.prototype.Draw = function (context) { m_spriteCircle.Draw(context); } and I draw it : var m_Circle = new Circle(); m_Circle.Draw(context);

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• How do I make a Java gave without a JFrame?

  - by kullalok

  I am working on an arcade-like game, and so far, I have been using JFrame. All the action occurs in the JFrame basically. However, I've noticed that a lot of games that you install on a computer don't have a frame. When you play them on Windows, the game covers the entire screen (the start bar disappears and you can't access any other application on your computer). I'd like to do that for my game. Is it possible to do so with Java? If so, how would I do this?

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• have a problem with my 2nd quad bottom left vertex position ? weirdd

  - by RubyKing

  Hey all I'm just trying to add another quad to my frustum and when doing so I get this weird little error. What happens is the bottom left side of my quad seems to stick to the center point for no apparent reason that I can think of and or figure out from. has anyone else experienced this issue and knows a solution or would you like more information please do ask. here is my main.cpp file http://pastebin.com/g9q8uAsd I think its because of 2 different quad vertex array data is in the same array.

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• Charakter coding / programming

  - by Jery

  lately I tryed a few times to create charakters for some games, but at some certain point (especially when collision detection came in) everything became messy and the interaction between chars, the world and certain items had a lot of bugs. So here is my question, how do you ussualy keep track of actions that your charakter is allowed to do, or more in general do you have some links / advices how to set up a char efficiantly? I´m working on a char right now, who should at least be able to run, jump, pick items up and use different fighting animations. Most ideas I came up with until now use some kind of action.priority / action.duration system to determain whats possible and what not, or a "action-manager" which defines for every action what is possible from that action on but it all doesnt work that well together =\ thx in advance for some input

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• Showing range on hexagonal grid

  - by user23673

  Here is the situation. I have hexagonal board,and a unit on it,with speed or move value 4.Diffrent terrain has a diffrent cost.When i click on the unit,game should show me a move range. My solution was to check each hex in range of 4,with A* pathfinding,and if path cost was less than 4 then this hex was in range.Finally game nicely show me range of that unit. My question is: Is there other solution to search for range on hex grids or square grid,because even if i am really proud of what i did in my solution,i think,it is a little to exaggerated?:)) What make me ask this question?I noticed that when unit speed is 4 or 6 or even 8,time to computing range for my computer was really good,but when speed was 10 and more i noticed that i needed to wait few second to compute.Well in real games i rather dont see something like this and my A* pathfinding is rather well optimized,so im thinking that my solution is wrong. Thanks for any replies.

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• What kind of math should I be expecting in advanced programming?

  - by I_Question_Things_Deeply

  And I don't mean just space shooters and such, because in non-3D environments it's obvious that not much beyond elementary math is needed to implement. Most of the programming in 2D games is mostly going to involve basic arithmetic, algorithms for enemy AI and dimensional worlds, rotation, and maybe some Algebra as well depending on how you want to design. But I ask because I'm not really gifted with math at all. I get frustrated and worn out just by doing Pre-Algebra, so Algebra 2 and Calculus would likely be futile for me. I guess I'm not so "right-brained" when it comes down to pure numbers and math formulas, but the bad part is that I'm no art-expert either. What do you people here suppose I should do? Go along avoiding as much of the extremely difficult maths I can't fathom, or try to ease into more complex math as I excel at programming?

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