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• Finding cubes in frustum

  - by salmonmoose

  Working with an infinite set of cubes, is there a way of detecting which cubes exist within a frustum? Most frustum culling seems to work along the lines of running through all objects and seeing if they intersect - this is ok with a finite set of objects, or something like Octrees. I'm currently finding all cubes within the frustum's bounding box - but that's far more than I really need. I could then test these all against it, but I was wondering if I could skip a step.

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• Cocos2D - Detecting collision

  - by Grace

  I am a beginner in cocos2d and im facing a problem with detecting collision for my coins. Sometimes it works sometimes it doesn't. So basically, im creating a game which the user (ship) have to avoid the obstacles and collect coins on the way. The collision of the obstacle works well but not for the coins. I was thinking maybe the loops for creating many coins is the problem but im not sure. Can anyone help? My codes: - (void)update:(ccTime)dt{ double curTime = CACurrentMediaTime(); if (curTime > _nextBridgeSpawn) { float randSecs = [self randomValueBetween:3.0 andValue:5.0]; _nextBridgeSpawn = randSecs + curTime; float randX = [self randomValueBetween:50 andValue:500]; float randDuration = [self randomValueBetween:8.0 andValue:10.0]; CCSprite *bridge = [_bridge objectAtIndex:_nextBridge]; _nextBridge++; if (_nextBridge >= _bridge.count) _nextBridge = 0; [bridge stopAllActions]; bridge.position = ccp(winSize.width/2, winSize.height); bridge.visible = YES; [bridge runAction:[CCSequence actions: [CCMoveBy actionWithDuration:randDuration position:ccp(0, -winSize.height)], [CCCallFuncN actionWithTarget:self selector:@selector(setInvisible:)], nil]]; this is where i declare my coins (continued from the update method) int randCoin = [self randomValueBetween:0 andValue:5]; _coin = [[CCArray alloc] initWithCapacity:randCoin]; for(int i = 0; i < randCoin; ++i) { coin = [CCSprite spriteWithFile:@"coin.png"]; coin.visible = NO; [self addChild:coin]; [_coin addObject:coin]; } float randCoinX = [self randomValueBetween:winSize.width/5 andValue:winSize.width - (border.contentSize.width *2)]; float randCoinY = [self randomValueBetween:100 andValue:700]; float randCoinPlace = [self randomValueBetween:30 andValue:60]; for (int i = 0; i < _coin.count; ++i) { CCSprite *coin2 = [_coin objectAtIndex:i]; coin2.position = ccp(randCoinX, (bridge.position.y + randCoinY) + (randCoinPlace *i)); coin2.visible = YES; [coin2 runAction:[CCSequence actions: [CCMoveBy actionWithDuration:randDuration position:ccp(0, -winSize.height-2000)], [CCCallFuncN actionWithTarget:self selector:@selector(setInvisible:)], nil]]; } } this is to check for collision (also in the update method) for (CCSprite *bridge in _bridge) { if (!bridge.visible) continue; if (CGRectIntersectsRect(ship.boundingBox, bridge.boundingBox)){ bridge.visible = NO; [ship runAction:[CCBlink actionWithDuration:1.0 blinks:5]]; } } } //this is the collision for coins which only work at times for (CCSprite *coin2 in _coin) { if (!coin2.visible) continue; if (CGRectIntersectsRect(ship.boundingBox, coin2.boundingBox)) { NSLog(@"Coin collected"); coin2.visible = NO; } } } Thank you.

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• Scalability of multi-threading in game server

  - by Taylor Hill

  What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• What's a good way to store a series of interconnected pipe and tank objects?

  - by mars

  I am working on a puzzle game with a 6 by 6 grid of storage tanks that are connected to up to 4 tanks adjacent to them via pipes. The gameplay is concerned with combining what's in a tank with an adjacent tank via the pipe than interconnects them. Right now I store the tanks in a 6x6 array, vertical pipes in a 5x6 array, and horizontal pipes in a 6x5 array. Each tank has a reference to the object that contains both tanks and pipes and when a pipe needs to be animated filling with liquid, the selected tank just calls a method on the container object telling it to animate the pipes it is connected to (subtract 1 from row or column to find connected pipes). This feels like the wrong way of doing it, as I've also considered just giving each tank references to the pipes connected to it to access directly.

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• Can you recommend a game server for a facebook board game?

  - by Yekmer Simsek

  I am seeking a game server that will scale well. All commercial and/or free software alternatives are welcome. Game will be a boardgame that is similar to poker. Some technical details are listed below. There will be a table which consists of 4 people, to send them message I need a channel manager. A table will be ready to play for at least 5 minutes. There should be a reliable channel manager. People will wait for some time(i.e.) and if they are not playing they will be kicked by server, so there will be a reliable timed task queue to execute some tasks. It should be quick enough to response and show the changes to all 4 people on that table simultaneously.To achive this server should have a powerfull I/O library. I think to use inmemory to have quick response times, but it comes with scalability problems. And some variables should be thread safe so a variable should be thread safe between multiple nodes. Flash(AS3) and Unity (.Net 2.0 C# mono) client API's should be available for socket connection. PS: I am using Reddwarf server, it lacks of documentation and multiple node.

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• Algorithm to zoom a plotted function

  - by astinx

  I'm making a game in android and I need plot a function, my algorithm is this: @Override protected void onDraw(Canvas canvas) { float e = 0.5f; //from -x axis to +x evaluate f(x) for (float x = -z(canvas.getWidth()); x < z(canvas.getWidth()); x+=e) { float x1,y1; x1 = x; y1 = f(x); canvas.drawPoint((canvas.getWidth()/2)+x1, (canvas.getHeight()/2)-y1, paintWhite); } super.onDraw(canvas); } This is how it works. If my function is, for example f(x)=x^2, then z(x) is sqrt(x). I evaluate each point between -z(x) to z(x) and then I draw them. As you can see I use the half of the size of the screen to put the function in the middle of the screen. The problem isn't that the code isn't working, actually plots the function. But if the screen is of 320*480 then this function will be really tiny like in the image below. My question is: how can I change this algorithm to scale the function?. BTW what I'm really wanting to do is trace a route to later display an animated sprite, so actually scale this image doesnt gonna help me. I need change the algorithm in order to draw the same interval but in a larger space. Any tip helps, thanks! Current working result Desired result UPDATE: I will try explain more in detail what the problem is. Given this interval [-15...15] (-z(x) to z(x)) I need divide this points in a bigger interval [-320...320] (-x to x). For example, when you use some plotting software like this one. Although the div where is contain the function has 640 px of width, you dont see that the interval is from -320 to 320, you see that the interval is from -6 to 6. How can I achieve this?

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• Using git (or any version control) regarding migration from one language to another [on hold]

  - by Max Benin

  I'm polishing an old project that i released some years ago, and the main purpose on that, is to arrange some folder structures and port the entire code from actionscript to haxe. All the game features, assets and design will remain the same. I have some doubts regarding versioning the project in this circumstance. Assuming that the only thing that will be drastically changed is the code migration, is it correct maintaining the new project changes on the same repository ? I was thinking in tagging it something like V1.1 or Branch the entire project. But i'm afraid that i'm gonna deviate from the versioning patterns. How can i use this version control issue in the best practice way ? Thanks.

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• Best way to solve the game 'bricolage'

  - by maggie

  I am trying to solve the following game http://www.hacker.org/brick/ using some kind of AI. The target of this game is to finally clear the board by clicking on groups of at least 3 bricks of the same color and removing them. If a group is disappearing the remaining bricks above will fall down or be moved left if a column got no bricks left. The higher the level - more colors and larger board. I already guessed that a pure bruteforce approach wont scale nice for higher levels. So i tried to implement a monte carlo like approach which worked ok for the first levels. But i am still not confident i will make the maximum level of 1052 with this. Currently i am stuck @~ level 100 :) The finding of the solution takes too much time... Hoping that there is a better way to do this i read some stuff about neural networks but i am really at the beginning of this. Before becoming obsessed by ANNs i want to be sure it is the right way for my problem. So my question is: Does it make any sense to apply an ANN to this game? Any suggestions?

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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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• What could cause a sudden stop in Box2D?

  - by alexanderpine

  I'm using Box2d for a game, and I have a bug that's driving me nuts. I've simplified the situation down to a square player sliding back and forth frictionlessly on top of a floor composed of a series of square tiles, driven by the left and right keys (which apply a horizontal force). Works great, sliding back and forth across the whole floor. Except... Every once in a while, the player will suddenly stick at the edge of one of the tiles as if it is hitting a (nonexistent) wall. Further pushes in the same direction it was traveling will fail, but as soon as I push backwards once in the opposite direction, I can push forwards past the sticking point again. The sticking point seems to be random, except for being on the edge of a tile. Happens while going left or right. For debugging purposes, I keep the Positions/velocity values for the previous two update ticks and print them out when this stop occurs. As an example, here you see the player moving right, decelerating slightly; pos2 should be about 8.7, but it stops dead instead. tick0: pos= 8.4636 vel= 7.1875 tick1: pos= 8.5816 vel= 7.0833 tick2: pos= 8.5816 vel= 0.0000 So, as the player is 0.8 and the tiles 1.0 wide, the player is stopping just as it is about to cross onto the next tile (8.5816 + 0.8/2 = 8.9816). In fact, I get a collision message (which I ignore except noting that it happened). It only seems to happen at x.5816 (or -x.4184) while moving right, and x.4167 (or -x.5833) while moving left I said that it's like hitting a wall, but in fact, when it hits a wall, the numbers look more like: tick0: pos0= 12.4131 vel2= 8.4375 tick1: pos1= 12.5555 vel1= 8.5417 tick2: pos2= 12.5850 vel0= 0.0000 so it moves further right on the last tick, which puts it in contact with the wall. Anyone seen anything like this. Any suggestion on how I could be causing this behavior.

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• Should I drawing directly on CCLayer or CCSprite?

  - by einverne

  Now I am a little confused in my cocos2d-x cpp project. I want to draw lines with user's finger touch. Following the screenshot of a CCScene: In the screen, there are two squares. I want show an animation in the first square and let the second one draw lines with user touch. Now these two squares are CCSprite. And I can draw dots in the second one on the CCLayer. But I am little confused that I should draw lines on the Sprite or on the Layer. Or are there other ways to organize the code?

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• Game 30% done on HTML5. Maybe it was a bad idea. Should I change to Unity3d? [on hold]

  - by Dokkat

  I'm creating a 3d game on HTML5. It's 30% complete and the hard part is already coded. The server is on node.js.Now I'm realizing that maybe it was not a wise choice. This is because I realized: Three.js still has many bugs. I don't see the same thing on every machine. Each browser, OS, can give different results. I'm afraid my clients will have a great stress installing my game properly. I have tons of sprites and models on my game. I wonder if my clients will have to load all them again everytime they want to play? I wonder if a Node.js server will be fast enough to handle it, and I'm afraid it won't be scalable. What would you advise me? Should I continue and finish the game on HTML5 or is it better to remake it on something else, like Unity3d for the client and (what?) for the server?

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• Confusing Callbacks

  - by SullY

  I'm trying to programm now a "game", and started with the EmptyProject that's provided by the DirectX SDK. The problem is that the Callbacks are confusing me. Can please someone explain me? Edit: DXUTSetCallbackD3D9DeviceAcceptable( IsD3D9DeviceAcceptable ); // not sure but I think that's the caps? DXUTSetCallbackD3D9DeviceLost( OnD3D9LostDevice ); DXUTSetCallbackDeviceChanging( ModifyDeviceSettings ); DXUTSetCallbackFrameMove( OnFrameMove );

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• where can i learn to make 3d games in java from scratch?

  - by dfhgdfnhgfn

  Just wondering if anyone knows of anything i can read or watch that explains 3D graphics. i do not want to use any game engine like jogl etc. but i am looking for a way i can learn in detail how 3D works. preferably in java. I have used some game engines but would prefer to learn to make for myself. I would also like to do it without the java3d library. I have also watched some tutorials on 3d games in java, but would like to learn in more detail. Thanks.

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• Change density of the body dynamically

  - by Siddharth

  In my game, I want to change density of my body object when it collide with other objects. I found something like following to change density but further I could not able to find any hint for this. So someone please help. Fixture fixture = goldenBoxArrayList.get(i) .getGoldenBoxBody() .getFixtureList().get(0); fixture.setDensity(0.5f); After setting fixture data I could not able to set it to the body.

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• What are milestones for a game developer to gauge their progress?

  - by user16710

  I know actually completing a game is a massive milestone, a complete polished, holistic experience. Something that I've not yet been able to commit to. There are of course classes and degrees to earn in several fields that will help gain experience, but how would one judge their own progress and strive to progress further? The yellow brick road to "Rock Star Game Programmer" is very cloudy. At this point I think it may be closer to an ocean, drifting along until you wake up one day at your destination.

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• Vectors with Circles Physics -java

  - by Joe Hearty

  This is a problem I've been having, When making a set number of filled circles at random locations on a JPanel and applying a gravity (a negative change in the y), each of the circles collide. I want them to have collision detection and push in the opposite direction using vectors but i don't know how to apply that to my scenario could someone help? public void drawballs(Graphics g){ g.setColor (Color.white); //displays circles for(int i = 0; i<xlocationofcircles.length-1; i++){ g.fillOval( (int) xlocationofcircles[i], (int) (ylocationofcircles[i]) ,16 ,16 ); ylocationofcircles[i]+=.2; //gravity if(ylocationofcircles[i] > 550) //stops gravity at bottom of screen ylocationofcircles[i]-=.2; //Check distance between circles(i think..) float distance =(xlocationofcircles[i+1]-xlocationofcircles[i]) + (ylocationofcircles[i+1]-xlocationofcircles[i]) ; if( Math.sqrt(distance) <16)

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• Installing Windows Platform SDK Problem [on hold]

  - by user1879097

  I cannot seem to install the windows platform sdk when i have visual studio 2010 installed,i followed the error code the sdk was getting and it said i need to unistall the 2010 redistribute runtimes,i did that and it has still not fixed the problem,this is very anoying as i have tried different things and been at it for atleast 5 hours now,did anyone else get this problem and know a work around? This is the order i tried install vs 2010, remove redis runtimes, install platform sdk (failed), install redis x86/x64, install service pack 1 for vs Thanks

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• How can I track a falling ball with a camera?

  - by Jason

  I have been trying to get my camera to follow a falling ball but with no success. here is the code float cameraY = (FrustumHeight / 2)+((ball.getPosition().y) /2) - (FrustumHeight /2); if (cameraY < FrustumHeight/2 ) cameraY = FrustumHeight/2; camera.position.set(0f,cameraY, 0f); Gdx.app.log("test",camera.position.toString()); camera.update(); camera.apply(Gdx.gl10); batch.setProjectionMatrix(camera.combined); batch.begin(); batch.draw(backgroundRegion, camera.position.x - FrustumWidth / 2, -cameraY - (FrustumHeight/2) , 320, 480); batch.draw(ballTexture, (camera.position.x - FrustumWidth / 2) + ball.getPosition().x,-cameraY + ball.getPosition().y - (FrustumHeight/2) , 32, 32); I'm sure I am doing this completely wrong - what is the correct way to do this?

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• SDL: How would I add tile layers with my area class as a singleton?

  - by Tony

  I´m trying to wrap my head around how to get this done, if at all possible. So basically I have a Area class, Map class and Tile class. My Area class is a singleton, and this is causing some confusion. I´m trying to draw like this: Background / Tiles / Entities / Overlay Tiles / UI. void C_Application::OnRender() { // Fill the screen black SDL_FillRect( Surf_Screen, &Surf_Screen->clip_rect, SDL_MapRGB( Surf_Screen->format, 0x00, 0x00, 0x00 ) ); // Draw background // Draw tiles C_Area::AreaControl.OnRender(Surf_Screen, -C_Camera::CameraControl.GetX(), -C_Camera::CameraControl.GetY()); // Draw entities for(unsigned int i = 0;i < C_Entity::EntityList.size();i++) { if( !C_Entity::EntityList[i] ) { continue; } C_Entity::EntityList[i]->OnRender( Surf_Screen ); } // Draw overlay tiles // Draw UI // Update the Surf_Screen surface SDL_Flip( Surf_Screen); } Would be nice if someone could give a little input. Thanks.

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• IndexOutOfRangeException on World.Step after enabling/disabling a Farseer physics body?

  - by WilHall

  Earlier, I posted a question asking how to swap fixtures on the fly in a 2D side-scroller using Farseer Physics Engine. The ultimate goal being that the player's physical body changes when the player is in different states (I.e. standing, walking, jumping, etc). After reading this answer, I changed my approach to the following: Create a physical body for each state when the player is loaded Save those bodies and their corresponding states in parallel lists Swap those physical bodies out when the player state changes (which causes an exception, see below) The following is my function to change states and swap physical bodies: new protected void SetState(object nState) { //If mBody == null, the player is being loaded for the first time if (mBody == null) { mBody = mBodies[mStates.IndexOf(nState)]; mBody.Enabled = true; } else { //Get the body for the given state Body nBody = mBodies[mStates.IndexOf(nState)]; //Enable the new body nBody.Enabled = true; //Disable the current body mBody.Enabled = false; //Copy the current body's attributes to the new one nBody.SetTransform(mBody.Position, mBody.Rotation); nBody.LinearVelocity = mBody.LinearVelocity; nBody.AngularVelocity = mBody.AngularVelocity; mBody = nBody; } base.SetState(nState); } Using the above method causes an IndexOutOfRangeException when calling World.Step: mWorld.Step(Math.Min((float)nGameTime.ElapsedGameTime.TotalSeconds, (1f / 30f))); I found that the problem is related to changing the .Enabled setting on a body. I tried the above function without setting .Enabled, and there was no error thrown. Turning on the debug views, I saw that the bodies were updating positions/rotations/etc properly when the state was changes, but since they were all enabled, they were just colliding wildly with each other. Does Enabling/Disabling a body remove it from the world's body list, which then causes the error because the list is shorter than expected? Update: For such a straightforward issue, I feel this question has not received enough attention. Has anyone else experienced this? Would anyone try a quick test case? I know this issue can be sidestepped - I.e. by not disabling a body during the simulation - but it seems strange that this issue would exist in the first place, especially when I see no mention of it in the documentation for farseer or box2d. I can't find any cases of the issue online where things are more or less kosher, like in my case. Any leads on this would be helpful.

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• Help with collision detection method [on hold]

  - by derek jones

  I was wondering if any of you could spare me some time to go over some collision detection on my platform engine. i tried XNA a few years back but for reasons i wont go into online could not continue, my health is now at a state where i am ready to try again but due to my current circumstances (and age) schooling is out of the question so i turn to you guys for help. Whilst i can adapt the MS sample ok and have some great features, you will agree modifying code is not really learning. So i have spent the last couple of week going over my old MS code and lots of stuff online and decided on what i want and have ported most of it over to code that i understand 90% of. I have my player class that moves about, jumps with gravity, has animations and a bounding box that follows it around. I have my map & basic level class to load levels from text files. Its just how i handle the collisions that i am struggling with as i will want per pixel collision on some tiles(i have code for this in a pong game i made so that should be ok). I'm pretty clear in my mind on what i need to do its just putting it in code and in the right place, here's what i was thinking. I was going to do it all in layers, have a tile layer, a collision layer & an item layer this way i could make a nice map editor in Win Forms at some point. Anyway i need to read in the collision layer the assign each tile a rectangle and collision property, and this is where i get me. Would any of you be able to spare some time and go over this with me ? I will post some code later Regards Del

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• Is the "impossible object" possible in computer graphics?

  - by CPP_Person

  This may be a silly question but I want to know the answer to it. I saw this thing called the "impossible object", while they're many different images of this online, it's suppost to be impossible geometry. Here is an example: Now as far as logic goes, I know you don't have to obey it in games, such as a flying cow, or an impossible object. So that's out of the way, but what stands in my way is whether or not there is a way to draw this onto a 3D scene. Like is there a way to represent it as a 3D object? Thanks!

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• What precaution should I take to hire online freelancer designers? [on hold]

  - by tomDev

  For quite some time my company is super busy with our apps, and a few days ago someone contacted me by email offering his services to help me as a graphic designer. He has a fair price, a flickr portfolio (with great stuff but not popular at all), same on Twitter. I was really considering in hiring him for some specific service, but the question is... what precaution should I take when hiring someone I have no idea who is? I can't even be sure I have his real name and his real country. How do I make a contract? How do I pay? How do I know he will not sue us after the graphics reach the App Store asking for more money? And of course, how do I know he will actually do the service and not steal from some stock service? Am I a bit paranoiac or is this a common deal with graphics designers? PS: if someone asks I can provide his flickr, but I think this is a general question and not specific for this designer.

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• Dropping multiple objects using an array in Actionscript?

  - by Eratosthenes

  I'm trying to get these fireBalls to drop more often, I'm not sure if I'm 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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