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• Is it possible to map mouse coordinates to isometric tiles with this coordinate system?

  - by plukich

  I'm trying to implement mouse interaction in a 2D isometric game, but I'm not sure if it's possible given the coordinate system used for tile maps in the game. I've read some helpful things like this. However, this game's coordinate system is "jagged" (for lack of a better word), and looks like this: Is it even possible to map mouse coordinates to this successfully, since the y-axis can't be drawn on this tile-map as a straight line? I've thought about doing odd-y-value translations and even-y-value translations with two different matrices, but that only makes sense going from tile to screen.

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• Can I use one set of images to represent multiple sprites in Java?

  - by mal

  I've got a game that has 3 basic sprites, at the moment I'm loading 8 images into each sprite for animating. Each character class has a sprite object. if I've got 10 characters on screen at once then that's 80 images loaded in to memory. Can I make a central sprite class that only holds 8 images for each of the 3 sprites, then get the character objects to request the relevant images from the central sprite class, thereby massively reducing the memory required for the images?

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• How can I spawn a sprite based on a condition after the game starts?

  - by teddyweedy

  How do I spawn a sprite anytime later in the game when the game starts? I'm using FlashDevelop with Flixel. I did try it in override public function create(): void. It works only in the beginning. I try it using if (FlxG.score == 1) but it doesn't work. I also tried it in override public function update(): void. It works and it is moving but it leaves a sprite making it a multi-sprite. I also did try FlxGroup but to no avail.

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• Calculating Hit Accuracy score in a game

  - by N0xus

  I'm currently in the process of making a scoreboard for my game. One of things I would like to display is the players accuracy in the amount of hits they had in game. However, I have never done this before and I've no idea how to go about doing this. Is there a commonly used algorithm out there that can help me calculate this, or has someone found a way to calculate this fairly easily? Any help with this would be appreciated.

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• Farseer Physics: Ways to create a Body?

  - by EdgarT

  I want to create something similar to this using farsser and Kinect: https://vimeo.com/33500649 This is my implementation until now: http://www.youtube.com/watch?v=GlIvJRhco4U I have the outline vertices and the triangulation of the user. And following the Texture to Polygonmsample i used this line to create the shape, where farseerObject is a list of vertices of the triangles: _compound = BodyFactory.CreateCompoundPolygon(World, farseerObject, 1f, BodyType.Dynamic); But I have to update the body each frame (like 30 fps) and this is very slow. I get just 2 or 3 fps. There's another (faster) way to create the Body from a list of triangles or the contour vertices?

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• Better way to go up/down slope based on yaw?

  - by CyanPrime

  Alright, so I got a bit of movement code and I'm thinking I'm going to need to manually input when to go up/down a slope. All I got to work with is the slope's normal, and vector, and My current and previous position, and my yaw. Is there a better way to rotate whether I go up or down the slope based on my yaw? Vector3f move = new Vector3f(0,0,0); move.x = (float)-Math.toDegrees(Math.cos(Math.toRadians(yaw))); move.z = (float)-Math.toDegrees(Math.sin(Math.toRadians(yaw))); move.normalise(); if(move.z < 0 && slopeNormal.z > 0 || move.z > 0 && slopeNormal.z < 0){ if(move.x < 0 && slopeNormal.x > 0 || move.x > 0 && slopeNormal.x < 0){ move.y += slopeVec.y; } } if(move.z > 0 && slopeNormal.z > 0 || move.z < 0 && slopeNormal.z < 0){ if(move.x > 0 && slopeNormal.x > 0 || move.x < 0 && slopeNormal.x < 0){ move.y -= slopeVec.y; } } move.scale(movementSpeed * delta); Vector3f.add(pos, move, pos);

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• AndEngine GLES2 - getting Black screen on emulator 4.1

  - by dizworld.com

  I'm new in andengine . I create following code public class MainActivity extends BaseGameActivity { static final int CAMERA_WIDTH = 800; static final int CAMERA_HEIGHT = 480; public Font mFont; public Camera mCamera; //A reference to the current scene public Scene mCurrentScene; public static BaseActivity instance; public EngineOptions onCreateEngineOptions() { instance = this; mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT); return new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera); } @Override public void onCreateResources(OnCreateResourcesCallback arg0) throws Exception { mFont = FontFactory.create(this.getFontManager(),this.getTextureManager(), 256, 256,Typeface.create(Typeface.DEFAULT, Typeface.BOLD), 32); mFont.load(); } @Override public void onCreateScene(OnCreateSceneCallback arg0) throws Exception { mEngine.registerUpdateHandler(new FPSLogger()); mCurrentScene = new Scene(); Log.v("Scene","enter"); mCurrentScene.setBackground(new Background(0.09804f, 0.7274f, 0.8f)); // return mCurrentScene; } @Override public void onPopulateScene(Scene arg0, OnPopulateSceneCallback arg1) throws Exception { // TODO Auto-generated method stub } } I got code on sites there is returning scene but in AndEngine GLES2 in method onCreateScene() there is no return scene ... so my First run is BLACK .. any suggestion :)

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• Any way to edit Warcraft MDX or MDL Animated models?

  - by Aralox

  I have been searching for a while for a way to get an animated mdl or mdx model into any 3D animating software (such as Blender), but so far have not had any success. I found a few methods of getting textured static mdx or mdl models into Blender/Milkshape/Hexagon, but no one seems to have written an importer that deals with the mdl/mdx model's keyframe animation. On that note, if anyone knows of a way of importing a keyframe-animated 3DS model into Blender, me and alot of people would appreciate it if you could let us know. Thanks for any help! :) PS: For anyone curious about static MDL or MDX - Blender, see here: http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/WarCraft_MDL

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• "Time Control" in a 2d Platformer

  - by Woody Zantzinger

  I am making a 2d platformer where the player can press a button, and restart the level, only their previous character will also run the level at the same time, like they are traveling back in time. I know other games have done this before, and the way I have thought of doing it is to make the game character have a set of actions (Idle, Jumping, Walking Left etc.) and then detect changes in those actions and log them into a list along with the game time. So then when I need the character to run the level again on its own, I can just go through the list changing its actions at the right time. Is this the best way to do it? Does anyone have any experience in this? Thanks.

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• When to use an Array vs When to use a Vector, when dealing with GameObjects?

  - by user32465

  I understand that from other answers, Arrays and Vectors are the best choices. Many on SE claim that Linked Lists and Maps are bad for video game programming. I understand that for the most part, I can use Arrays. However, I don't really understand exactly when to use Vectors over Arrays. Why even use Vectors? Wouldn't it be best if I simply always used an Array, that way I know how much memory my game needs? Specifically my game would only ever load a single "Map" area of tiles, such as Map[100][100], so I could very easily have an array of GameObjectContainer GameObjects[100][100], which would reserve an entire map's worth of possible gameobjects, correct? So why use a Vector instead? Memory is quite large on modern hardware.

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• bump mapping with 2 normal maps

  - by DorkMonstuh

  I was wondering if its actually possible to do bump mapping with 2 normal maps... I have tried doing it this way however I get a function overload on max and dot. uniform sampler2D n_mapTex; uniform sampler2D n_mapTex2; uniform sampler2D refTex; varying mediump vec2 TexCoord; varying mediump float vTime; void main() { mediump vec4 wave = texture2D(n_mapTex, TexCoord - vTime); mediump vec4 wave2 = texture2D(n_mapTex2, TexCoord + vTime); mediump vec4 bump = mix(wave2, wave, 0.5); //this extracts the normals from the combined normal maps mediump vec4 normal = normalize(bump.xyzw * 2.0 - 1.0); //determines light position mediump vec3 lightPos = normalize(vec3(0.0, 1.0, 3.0)); mediump float diffuse = max(dot(normal, lightPos),0.0); gl_FragColor = mix(texture2D(refTex, TexCoord), bump, 0.5); }

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• How to make image bigger than the screen to be slideable in the screen in monogame for windows phone 8?

  - by Moses Aprico

  (Idk if my title is correct, because when I google it, there is no related result I guess) I am not sure how to explain it correctly, but I am making a plain 2D, tile based, tactic game in windows phone 8 using monogame. I want to make my map is "slideable". With "slidable" I mean I can draw larger images (in total) than my screen and then slide it so I can view a certain area of the drawn images Example : I have a screen which dimension is 1280x720. I have a 1500x1500px image, which consists of 15 tiles, which is 100x100px each, which each tiles is redrawn each times the "Draw" is called. If the image is larger than the screen, the displayed area will be trimmed and of course, making a 220x780px area that is unseenable. The only way to see all of it is through "sliding" the screen around, so I can see all the area. My question is : How to make that happen? Because in default, the screen is unslideable and the image remains trimmed. Sorry if my question and explanation is not clear enough. Clarify it as much as you like. Thank you.

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• Geometry Shader : points + Triangles

  - by CmasterG

  I have different Shaders and for each Shader a instance of the ShaderClass class, which initializes the Shaders, Renders the Shaders, etc. I use most of the Shaderclasses without Geometry Shader, but in one Shader Class i also use a Geometry Shader. The problem is, that when I render one object with the Shaderclass that uses the Geometry shader, all other object are rendered with the same geometry that I create in the Geometry Shader. Can you help me? Is it possible that I have to use a Geometry Shader for each object, when I use one for one object? I use DirectX 11 with C++.

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• 2D Topdown Shooter - Player Movement Relative to Mouse

  - by Jarmo

  I'm trying to make a topdown 2D space game for my school project. I'm almost done but I just want to add a few little things to make the game more fun to play. if (keystate.IsKeyDown(Keys.W)) { vPlayerPos += Vector2.Normalize(new Vector2(Mouse.GetState().X - vPlayerPos.X, Mouse.GetState().Y - vPlayerPos.Y)) * 3; rPlayer.X = (int)vPlayerPos.X; rPlayer.Y = (int)vPlayerPos.Y; } if (keystate.IsKeyDown(Keys.S)) { vPlayerPos += Vector2.Normalize(new Vector2(Mouse.GetState().X - vPlayerPos.X, Mouse.GetState().Y - vPlayerPos.Y)) * -3; rPlayer.X = (int)vPlayerPos.X; rPlayer.Y = (int)vPlayerPos.Y; } This is what i use to move towards and away from my mouse crossair. I tried to make a somewhat similar function to make it strafe with "A" and "D". But for some reason I just couldn't get it done. Any thoughts?

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• How should I access frame buttons from a controller in an MVC approach?

  - by Loris

  I'm developing an italian card game using the mvc pattern. I have the class GameFrame that contains the view. The user's card are buttons (JButton objects). I have 3 controllers: GameController: to control the game in general. Contains the game loop. HumanPlayerController: to control the user input ComputerPlayerController: contains the AI of the computer PlayerController: is an interface with the makeTurn() method. It's implemented by HumanP.C. and ComputerP.C. HumanPlayerController implements ActionListener too. But what is the right way to access to the GameFrame buttons? I need it for understand which card was chosen. GameFrame and HumanPlayerController are in different packages. Should i make the JButtons public?

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• 2D Polygon Triangulation

  - by BleedObsidian

  I am creating a game engine using the JBox2D physics engine. It only allows you to create polygon fixtures up to 8 vertices, To create a body with more than 8 vertices, you need to create multiple fixtures for the body. My question is, How can I split the polygons a user creates into smaller polygons for JBox2D? Also, what topology should I use when splitting the polygons and why? (If JBox2D can have up to 8 vertices, why not split polygons into 8 per polygon)

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• Using normals in DirectX 10

  - by Dave

  I've got a working OBJ loader that loads vertices, indices, texture coordinates, and normals. As of right now it doesn't process texture coordinates or normals but it stores them in arrays and creates a valid mesh with the vertices and indices. Now I am trying to figure out how can I make the shader use the correct normal in the array for the current vertex if I can't setnormals() to my mesh. If I were to just use an index in my array of normals corresponding to the index in the vertices, how would I retrieve the current index the shader is processing? BTW: I am trying to write a blinn-phong shader technique. Also when I create the input layout and I've added the semantic NORMAL to it, how would I list the multiple semantics in that single parameter? Would I just separate it with a space? PS: If you need to see any code, just let me know.

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• Cocos2D: Upgrading from OpenGL 1.1 to 2.0

  - by Alex

  I have recently starting upgrading my ios game to the latest Cocos2D (2.0 rc), and I am having some difficulties upgrading my texture generation code to OpenGL 2.0. In the old version I generated images with this code: CCRenderTexture *rt = [CCRenderTexture renderTextureWithWidth:WIDTH height:HEIGHT]; [rt beginWithClear:bgColor.r g:bgColor.g b:bgColor.b a:bgColor.a]; glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(2, GL_FLOAT, 0, verts); glColorPointer(4, GL_FLOAT, 0, colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)nVerts); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); [rt end]; But since OpenGL 2.0 works differently this code won't work. What is the best way to use the new OpenGL?

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• How to get the blocks seen by the player?

  - by m4tx

  I'm writing a Minecraft-like game using Ogre engine and I have a problem. I must optimize my game, because when I try draw 10000 blocks, I have 2 FPS... So, I got the idea that blocks display of the plane and to hide the invisible blocks. But I have a problem - how do I know which blocks at a time are visible to the player? And - if you know of other optimization methods for such a game, write what and how to use them in Ogre.

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• Free vs. Paid: Picking a Financial Model

  - by ashes999

  I finally embarked upon my first "paid" game. What this means is that I will incorporate some sort of monetization strategy in my game. This may mean making the app pay-to-download, making it "freemium" with paid content, or something else. Having never done something like this, I'm at a complete loss as to how to figure out what I should do. I know a couple of models (pay to download, freemium, etc.) and I can brainstorm some ideas. But how do I figure out what strategy to use? Perhaps there's some body of research on this? (I recall reading that MMOs popular in Korea use a model where cosmetic changes only are pay-to-buy; everything else is free).

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• Points around a circumference C#

  - by Lautaro

  Im trying to get a list of vectors that go around a circle, but i keep getting the circle to go around several times. I want one circel and the dots to be placed along its circumference. I want the first dot to start at 0 and the last dot to end just before 360. Also i need to be able to calculate the spacing by the ammount of points. List<Vector2> pointsInPath = new List<Vector2>(); private int ammountOfPoints = 5; private int blobbSize = 200; private Vector2 topLeft = new Vector2(100, 100); private Vector2 blobbCenter; private int endAngle = 50; private int angleIncrementation; public Blobb() { blobbCenter = new Vector2(blobbSize / 2, blobbSize / 2) + topLeft; angleIncrementation = endAngle / ammountOfPoints; for (int i = 0; i < ammountOfPoints; i++) { pointsInPath.Add(getPointByAngle(i * angleIncrementation, 100, blobbCenter)); // pointsInPath.Add(getPointByAngle(i * angleIncrementation, blobbSize / 2, blobbCenter)); } } private Vector2 getPointByAngle(float angle, float distance, Vector2 centre) { return new Vector2((float)(distance * Math.Cos(angle) ), (float)(distance * Math.Sin(angle))) + centre ; }

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• Most effective marketing strategy to promote a casual iOS game?

  - by user1114968

  So I posted this on another forum yesterday but that forum got suspended for malware so gotta wait for the webmaster to fix the site. Here's the basics: We've released a press release through PRMac that included a video review. Submitted and followed up on all the big iOS review sites. None of them replied back with interest. A lot of them just told me that their editors are volunteers who will review games that are "interesting to their readers" and that they would put my app "into consideration" The only site that reviewed our app and promoted virally was iPhoneAppReview.com which we paid. We promoted on the top iOS forums We are now doing in-app advertising through inMobi and are integrating the SDK code into our app to start doing Tapjoy We posted up our gameplay videos on YouTube Any marketing strategies that anyone can suggest or recommend that we haven't used yet? If anyone wants to try out our game and give feedback on the game or the site or anything, that would be great! Our target countries are Japan, China, and the US.

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• Corona sdk events dispatched with dispatchEvent() are handled directly upon call. Why so?

  - by Amoxus

  I noticed to my surprise that an event created with dispatchEvent(event) gets handled directly when called, and not together with other events at a specific phase of the frame loop. Two main reasons of having an event system are: so that you can call code B from code A, but still want to prioritize code A. to make sure there are no freaky loopedy loops where code A calls code B calls code A ... I wonder what Ansca's rationale behind having events being handled directly this way is. And does Corona handle loopedy loops and other such pitfalls gracefully? The following code demonstrates dispatchEvent(): T= {} Z = display.newRect(100,100,100,100) function T.doSomething() print("T.doSomething: begun") local event = { name="myEventType", target=T } Z:dispatchEvent( event ) print("T.doSomething: ended") end function Z.sayHello(event) print("Z.sayHello: begun and ended") end Z:addEventListener("myEventType", Z.sayHello) print("Main: begun") T.doSomething() print("Main: ended") However Ansca claims the contrary at http://developer.coronalabs.com/reference/index/objectdispatchevent Can anyone clear this up a little? ( Using Corona simulator V 2012.840 )

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• Crash due to removal of Elements like CCSprite from NSMutableArray

  - by mayuur

  So, here's how it goes. I am currently working on Cocos2d game, which consists of many Obstacles. One obstacle gets added on the screen at an interval of 10 seconds like this. ObstacleSprite* newObstacle = [ObstacleSprite spriteWithFile:@"Obstacle.png" rect:CGRectMake(0, 0, 20, 20)]; newObstacle.position = ccp(mainPlayer1.position.x,10); [self addChild:newObstacle]; [self.arrayForObstacles addObject:newObstacle]; Now, I insert these obstacles into the arrayForObstacles because I also want to keep checking whether the Obstacles and MainPlayer don't collide. I check it with the help of this function. - (void) checkCollisionWithObstacle { if(mainPlayer1.playerActive) { for(int i = 0; i < [self.arrayForObstacles count]; i++) { ObstacleSprite* newObstacle = [self.arrayForObstacles objectAtIndex:i]; if(newObstacle != nil) { if(CGRectIntersectsRect([mainPlayer1 boundingBox], [newObstacle boundingBox])) { mainPlayer1.livesLeft--; } } } } } THE ISSUE Problem is when I get to certain score, one of the Obstacles gets deleted. Removal of Obstacles works as in First In-First Out (FIFO) mode. So, to delete obstacles, I write the following method : - (void) keepUpdatingScore { //update new score mainPlayer1.score+=10; //remove obstacle when score increases by 5k if(mainPlayer1.score > 5000 && mainPlayer1.score > 0) { mainPlayer1.playerActive = NO; if([self.arrayForObstacles count] > 0) { CCLOG(@"count is %d",[self.arrayForObstacles count]); ObstacleSprite* newObstacle = [self.arrayForObstacles objectAtIndex:0]; [self.arrayForObstacles removeObjectAtIndex:0]; [self removeChild:newObstacle cleanup:YES]; CCLOG(@"count is %d",[self.arrayForObstacles count]); } } else { } } It crashes when score crosses 5000 mark! UPDATE Crash happens when it again goes to the method checkCollisionWithObstacle. This is the THREAD Look. THis is the line Which crashes.

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• How to implement the setup rules like Clash of Clan?

  - by user25959

  Now I'm already implement the setup build rules which the building could move by unit grid width and height. But the validation detection is poor efficiency. The algorithm cost me 10~12(ms) in average when I move the building. Here is my approach to that: 1.Basic Grid, it is a two dimensional array. Grid[row][column], so that I can save info for each grid. Like whether is it in occupied or excluded. 2.Exclude Space, this is a space which limit same building numbers in space.

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