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• Which K-factor should be used in case players have different K-factor values

  - by DmitryN

  I am implementing a ranking system based on the Elo rating and cannot get a point about the K-factor. If two players with different skills and, therefore, different K-factors are playing, which exactly K-factor should be used when changing their ratings? For example, player A has rating 2500 and K-factor 16 (probability ~75%) while player B has rating 2300 and K-factor 24 (probability ~25%). If player A wins, do I need to use 16 as K-factor for both players or 16 for player A and 24 for player B?

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• Multiple render targets and pixel shader outputs terminology

  - by Rei Miyasaka

  I'm a little confused on the jargon: does Multiple Render Targets (MRT) refer to outputting from a pixel shader to multiple elements in a struct? That is, when one says "MRT is to write to multiple textures", are multiple elements interleaved in a single output texture, or do you specify multiple discrete output textures? By the way, from what I understand, at least for DX9, all the elements of this struct need to be of the same size. Does this restriction still apply to DX11?

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• Monster's AI in an Action-RPG

  - by Andrea Tucci

  I'm developing an action rpg with some University colleagues. We've gotton to the monsters' AI design and we would like to implement a sort of "utility-based AI" so we have a "thinker" that assigns a numeric value on all the monster's decisions and we choose the highest (or the most appropriate, depending on monster's iq) and assign it in the monster's collection of decisions (like a goal-driven design pattern) . One solution we found is to write a mathematical formula for each decision, with all the important parameters for evaluation (so for a spell-decision we might have mp,distance from player, player's hp etc). This formula also has coefficients representing some of monster's behaviour (in this way we can alterate formulas by changing coefficients). I've also read how "fuzzy logic" works; I was fascinated by it and by the many ways of expansion it has. I was wondering how we could use this technique to give our AI more semplicity, as in create evaluations with fuzzy rules such as IF player_far AND mp_high AND hp_high THEN very_Desiderable (for a spell having an high casting-time and consume high mp) and then 'defuzz' it. In this way it's also simple to create a monster behaviour by creating ad-hoc rules for every monster's IQ category. But is it correct using fuzzy logic in a game with many parameters like an rpg? Is there a way of merging these two techniques? Are there better AI design techniques for evaluating monster's chooses?

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• Dealing with "jumping" sprites: badly centered?

  - by GigaBass

  Thing is, I've used darkFunction Editor as a way to get all the spriteCoordinates off a spriteSheet for each individual sprite, and parse the .xml it generates inside my game. It all works fine, except when the sprites are all similarly sized, but when a sprite changes from a small sprite into a big one, such as here: When from walking from some direction, to attacking, it starts "jumping", appearing glitchy, because it's not staying in the same correct position, only doing so for the right attacking sprite, due to the drawing being made from the lower left part of the rectangle. I think someone experienced will immediately recognize the problem I mean, if not, when I return home soon, I will shoot a little youtube video demonstrating the issue! So the question is: what possible solutions are there? I've thought that some sort of individual frame "offset" system might be the answer, or perhaps splitting, in this case, the sprite in 2: the sword, and the character itself, and draw sword according to character's facing, but that might be overly complex. Another speculation would be that there might be some sort of method in LibGdx, the library I'm using, that allows me to change the drawing center (which I looked for and didn't find), so I could choose from where the drawing starts.

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• What is the best practice to move sprites using mouse order in Tile games?

  - by Robin-Hood

  I am trying to make my first Tile-game using XNA. I have no problem drawing the map layers using TiledLib from codeplex, but, now I want to give sprite an (order) to move to a specific position on map, by selecting the sprite (left mouse click) and then right mouse click somewhere on the map to specify the target position. I don’t know what is the best practice to move sprite this way, considering that there may be collision objects in the direct path. what is the best practice to do this? Is there any demo covering this issue? thanks. BTW: I couldn’t upload snapshot because of my low score :(

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• This code is of chess game. What is represented by 'DISTANCE' in code? [closed]

  - by rajeshverma423

  package chess; public class Evaluate { public static final int PIECE_KING = 0; public static final int PIECE_QUEEN = 1; public static final int PIECE_ROOK = 2; public static final int PIECE_BISHOP = 3; public static final int PIECE_KNIGHT = 4; public static final int PIECE_PAWN = 5; public static final int FULL_BIT_RANK = 4080; public static final int LAZY_MARGIN = 100; public static final int ISOLATED_PENALTY = 10; public static final int DOUBLE_PENALTY = 4; public static final int[] PIECE_VALUE = { 0, 9, 5, 3, 3, 1 }; public static final int[] PASS_PAWN = { 0, 35, 30, 20, 10, 5 }; 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 };

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• How to sync the actions in a mutiplayer game?

  - by Wheeler

  I connect the clients with UDP (its a peer to peer connection on a multicast network) and the clients are sending their positions in every frame (in WP7 it means the default 30 FPS) to each other. This game is kinda a pong game, and my problem is the next: whenever the opponent hits the ball the angle will not be the same on both mobiles. I think its because the latency (1 pixel difference can cause a different angle). So my question is: how can I sync the hitting event?

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• How can I make OpenGL textures scale without becoming blurry?

  - by adorablepuppy

  I'm using OpenGL through LWJGL. I have a 16x16 textured quad rendering at 16x16. When I change it's scale amount, the quad grows, then becomes blurrier as it gets larger. How can I make it scale without becoming blurry, like in Minecraft. Here is the code inside my RenderableEntity object: public void render(){ Color.white.bind(); this.spriteSheet.bind(); GL11.glBegin(GL11.GL_QUADS); GL11.glTexCoord2f(0,0); GL11.glVertex2f(this.x, this.y); GL11.glTexCoord2f(1,0); GL11.glVertex2f(getDrawingWidth(), this.y); GL11.glTexCoord2f(1,1); GL11.glVertex2f(getDrawingWidth(), getDrawingHeight()); GL11.glTexCoord2f(0,1); GL11.glVertex2f(this.x, getDrawingHeight()); GL11.glEnd(); } And here is code from my initGL method in my game class GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glClearColor(0.46f,0.46f,0.90f,1.0f); GL11.glViewport(0,0,width,height); GL11.glOrtho(0,width,height,0,1,-1); And here is the code that does the actual drawing public void start(){ initGL(800,600); init(); while(true){ GL11.glClear(GL11.GL_COLOR_BUFFER_BIT); for(int i=0;i<entities.size();i++){ ((RenderableEntity)entities.get(i)).render(); } Display.update(); Display.sync(100); if(Display.isCloseRequested()){ Display.destroy(); System.exit(0); } } }

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• What is wrong with my Dot Product?

  - by Clay Ellis Murray

  I am trying to make a pong game but I wanted to use dot products to do the collisions with the paddles, however whenever I make a dot product objects it never changes much from .9 this is my code to make vectors vector = { make:function(object){ return [object.x + object.width/2,object.y + object.height/2] }, normalize:function(v){ var length = Math.sqrt(v[0] * v[0] + v[1] * v[1]) v[0] = v[0]/length v[1] = v[1]/length return v }, dot:function(v1,v2){ return v1[0] * v2[0] + v1[1] * v2[1] } } and this is where I am calculating the dot in my code vector1 = vector.normalize(vector.make(ball)) vector2 = vector.normalize(vector.make(object)) dot = vector.dot(vector1,vector2) Here is a JsFiddle of my code currently the paddles don't move. Any help would be greatly appreciated

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• Game Engine that allows for objects being placed in-game

  - by user185812

  I am looking for a game engine with multiplayer support that allows for players to place objects in the terrain. (eg. in TF2 one can place teleporters, etc...or in minecraft one can place blocks). I don't need the placeable objects to be interactive like in TF2, but I just need an engine that won't make me code this from scratch. I have decent knowledge of Python, PHP, HTML, C++ and C# (and a small knowledge of Lua scripting, although I have only been at it for a few months) so I should be able to handle most engines. So far I have looked at UDK and Cryengine, and wasn't thrilled with either.

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• What are the GPU requirements for XNA 4.0?

  - by Nate Koppenhaver

  I tried to build a sample application using XNA, but I got an error saying that Pixel Shader 1.1 was required, so I got a used Radeon X300 GPU that supports Pixel Shader. I tried to build it again, but I got another error saying that "Your current graphics card does not support the XNA HiDef profile" and would not build. Since that card seems to not be compatible, I guess I need to buy another one. What features should I look for to make sure that it's compatible with XNA?

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• Help finding time of collision

  - by WannaBe

  I am making a simple game right now and am struggling with collision response. My goal is to someday be able to turn it into a 2D platformer but I have a long way to go. I am currently making this in JavaScript and using the canvas element so (0,0) is in the top left and positive X is to the right and positive Y is down. I read a helpful post on StackExchange that got me started on this but I can't seem to get the algorithm 100% correct. How to deal with corner collisions in 2D? I can detect the collision fine but I can't seem to get the response right. The goal is to detect which side the player hit first since minimum displacement doesn't always work. The X response seems to work fine but the Y only works when I am far from the corners. Here is a picture showing what happens Here is the code var bx = box.x; var by = box.y; var bw = box.width; var bh = box.height; var boxCenterX = bx + (bw/2); var boxCenterY = by + (bh/2); var playerCenterX = player.x + player.xvel + (player.width/2); var playerCenterY = player.y + player.yvel + (player.height/2); //left = negative and right = positve, 0 = middle var distanceXin = playerCenterX - boxCenterX; var distanceYin = playerCenterY - boxCenterY; var distanceWidth = Math.abs(distanceXin); var distanceHeight = Math.abs(distanceYin); var halfWidths = (bw/2) + (player.width/2); var halfHeights = (bh/2) + (player.height/2); if(distanceWidth < halfWidths){ //xcollision if(distanceHeight < halfHeights){ //ycollision if(player.xvel == 0){ //adjust y if(distanceYin > 0){ //bottom player.y = by + bh; player.yvel = 0; }else{ player.y = by - player.height; player.yvel = 0; } }else if(player.yvel == 0){ //adjust x if(distanceXin > 0){ //right player.x = bx + bw; player.xvel = 0; }else{ //left player.x = bx - player.width; player.xvel = 0; } }else{ var yTime = distanceYin / player.yvel; var xTime = distanceXin / player.xvel; if(xTime < yTime){ //adjust the x it collided first if(distanceXin > 0){ //right player.x = bx + bw; player.xvel = 0; }else{ //left player.x = bx - player.width; player.xvel = 0; } }else{ //adjust the y it collided first if(distanceYin > 0){ //bottom player.y = by + bh; player.yvel = 0; }else{ player.y = by - player.height; player.yvel = 0; } } } } } And here is a JSFiddle if you would like to see the problem yourself. http://jsfiddle.net/dMumU/ To recreate this move the player to here And press up and left at the same time. The player will jump to the right for some reason. Any advice? I know I am close but I can't seem to get xTime and yTime to equal what I want every time.

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• Alternative to pyGame ?

  - by stighy

  Hi, i'm learning something about game programming from a book about "pyGame". pyGame is simple, but... python is a little complex and different from my previous knoweledge about programming. I know "classical" language: C# (also C/C++), Java ... I know a lot of people love Python but for me is a little harder to learn! So i'm looking something like "pyGame" but for java or for c# ... A library with which i can do almost the same thing i can do with pygame (so .. do more with less code ... and headhace). Thank you Ps: excuse my "poor" english!

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• Developing a long pannable, sprite-animated Windows Store app

  - by Groo

  I am creating my first Windows Store app in XAML, and I cannot seem to find a proper example for the requirements I have (I have spent a couple of days fiddling around, so I apologize if I missed something obvious). Basic idea of the app is to have a large scrollable canvas which would lazily start animating visible parts of the view as soon as user stops panning over a certain content (with some audio played also): My original idea was to use a StackPanel to add a bunch of custom controls, each of which would then animate itself once visible (with a short delay), but I have a couple of concerns: If the entire canvas is ~50 screen widths wide, is it feasible to load all content at the beginning, or do I need to plan doing some lazy loading during scrolling? For example, when I select a certain region in the Bing Travel app, it seems to lazily load tiles as I scroll it towards the end. Since content is stretched 100% vertically, and these animations are vectorized to be resolution independent, I am not sure if XAML (CompositionTarget) will be able to handle this, or I have to go for DirectX (MonoGame or C++) to get rid of flicker. Even better, is there an example for Windows 8 which uses a 100% vertically sized GridView with custom animated controls inside?

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• FloodFill Algorithm for Game of Go

  - by Jackson Borghi

  I'm having a hell of a time trying to figure out how to make captured stones disappear. I've read everywhere that I should use the FloodFill algorithm, but I havent had any luck with that so far. Any help would be amazing! Here is my code: package Go; import static java.lang.Math.; import static stdlib.StdDraw.; import java.awt.Color; public class Go2 { public static Color opposite(Color player) { if (player == WHITE) { return BLACK; } return WHITE; } public static void drawGame(Color[][] board) { Color[][][] unit = new Color[400][19][19]; for (int h = 0; h < 400; h++) { for (int x = 0; x < 19; x++) { for (int y = 0; y < 19; y++) { unit[h][x][y] = YELLOW; } } } setXscale(0, 19); setYscale(0, 19); clear(YELLOW); setPenColor(BLACK); line(0, 0, 0, 19); line(19, 19, 19, 0); line(0, 19, 19, 19); line(0, 0, 19, 0); for (double i = 0; i < 19; i++) { line(0.0, i, 19, i); line(i, 0.0, i, 19); } for (int x = 0; x < 19; x++) { for (int y = 0; y < 19; y++) { if (board[x][y] != YELLOW) { setPenColor(board[x][y]); filledCircle(x, y, 0.47); setPenColor(GRAY); circle(x, y, 0.47); } } } int h = 0; } public static void main(String[] args) { int px; int py; Color[][] temp = new Color[19][19]; Color[][] board = new Color[19][19]; Color player = WHITE; for (int i = 0; i < 19; i++) { for (int h = 0; h < 19; h++) { board[i][h] = YELLOW; temp[i][h] = YELLOW; } } while (true) { drawGame(board); while (!mousePressed()) { } px = (int) round(mouseX()); py = (int) round(mouseY()); board[px][py] = player; while (mousePressed()) { } floodFill(px, py, player, board, temp); System.out.print("XXXXX = "+ temp[px][py]); if (checkTemp(temp, board, px, py)) { for (int x = 0; x < 19; x++) { for (int y = 0; y < 19; y++) { if (temp[x][y] == GRAY) { board[x][y] = YELLOW; } } } } player = opposite(player); } } private static boolean checkTemp(Color[][] temp, Color[][] board, int x, int y) { if (x < 19 && x > -1 && y < 19 && y > -1) { if (temp[x + 1][y] == YELLOW || temp[x - 1][y] == YELLOW || temp[x][y - 1] == YELLOW || temp[x][y + 1] == YELLOW) { return false; } } if (x == 18) { if (temp[x - 1][y] == YELLOW || temp[x][y - 1] == YELLOW || temp[x][y + 1] == YELLOW) { return false; } } if (y == 18) { if (temp[x + 1][y] == YELLOW || temp[x - 1][y] == YELLOW || temp[x][y - 1] == YELLOW) { return false; } } if (y == 0) { if (temp[x + 1][y] == YELLOW || temp[x - 1][y] == YELLOW || temp[x][y + 1] == YELLOW) { return false; } } if (x == 0) { if (temp[x + 1][y] == YELLOW || temp[x][y - 1] == YELLOW || temp[x][y + 1] == YELLOW) { return false; } } else { if (x < 19) { if (temp[x + 1][y] == GRAY) { checkTemp(temp, board, x + 1, y); } } if (x >= 0) { if (temp[x - 1][y] == GRAY) { checkTemp(temp, board, x - 1, y); } } if (y < 19) { if (temp[x][y + 1] == GRAY) { checkTemp(temp, board, x, y + 1); } } if (y >= 0) { if (temp[x][y - 1] == GRAY) { checkTemp(temp, board, x, y - 1); } } } return true; } private static void floodFill(int x, int y, Color player, Color[][] board, Color[][] temp) { if (board[x][y] != player) { return; } else { temp[x][y] = GRAY; System.out.println("x = " + x + " y = " + y); if (x < 19) { floodFill(x + 1, y, player, board, temp); } if (x >= 0) { floodFill(x - 1, y, player, board, temp); } if (y < 19) { floodFill(x, y + 1, player, board, temp); } if (y >= 0) { floodFill(x, y - 1, player, board, temp); } } } }

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• Questions about XNA

  - by Maik Klein

  I've read tons of different threads about XNA, but I still have some questions. First of all: I have 2 years of experience programming and C# is my main language, so XNA would fit perfectly for me, but I have some concerns. People mentioned that C# has a performance loss compared to C++. Is this true? XNA only supports DirectX 9. I found the ANX framework which is pretty similar to XNA but it is capable of DirectX 11. Would this be a good alternative ? Because I'm worried about the performance loss of C#, I searched for a C++ framework and found SFML. It's based on C++ but can be integrated into C#. I already have some experience with UDK, but I am really interested in creating more by myself ( lighting physics etc ). I didn't start yet, what would you recommend me to use / learn ? I am going to create a first person shooter (3D) and I have plenty of time for this. My aim is realtime lighting, realtime global illumination, image-based reflections etc. I want to develop for Windows. Edit: I found something interesting: OpenTK. It supports the latest version of OpenGL which is on the same level as DX11 (if my knowledge is correct). It makes use of mono.

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• Implement Negascout Algorithm with stack

  - by Dan

  I'm not familiar with how these stack exchange accounts work so if this is double posting I apologize. I asked the same thing on stackoverflow. I have added an AI routine to a game I am working on using the Negascout algorithm. It works great, but when I set a higher maximum depth it can take a few seconds to complete. The problem is it blocks the main thread, and the framework I am using does not have a way to deal with multi-threading properly across platforms. So I am trying to change this routine from recursively calling itself, to just managing a stack (vector) so that I can progress through the routine at a controlled pace and not lock up the application while the AI is thinking. I am getting hung up on the second recursive call in the loop. It relies on a returned value from the first call, so I don't know how to add these to a stack. My Working c++ Recursive Code: MoveScore abNegascout(vector<vector<char> > &board, int ply, int alpha, int beta, char piece) { if (ply==mMaxPly) { return MoveScore(evaluation.evaluateBoard(board, piece, oppPiece)); } int currentScore; int bestScore = -INFINITY; MoveCoord bestMove; int adaptiveBeta = beta; vector<MoveCoord> moveList = evaluation.genPriorityMoves(board, piece, findValidMove(board, piece, false)); if (moveList.empty()) { return MoveScore(bestScore); } bestMove = moveList[0]; for(int i=0;i<moveList.size();i++) { MoveCoord move = moveList[i]; vector<vector<char> > newBoard; newBoard.insert( newBoard.end(), board.begin(), board.end() ); effectMove(newBoard, piece, move.getRow(), move.getCol()); // First Call ****** MoveScore current = abNegascout(newBoard, ply+1, -adaptiveBeta, -max(alpha,bestScore), oppPiece); currentScore = - current.getScore(); if (currentScore>bestScore){ if (adaptiveBeta == beta || ply>=(mMaxPly-2)){ bestScore = currentScore; bestMove = move; }else { // Second Call ****** current = abNegascout(newBoard, ply+1, -beta, -currentScore, oppPiece); bestScore = - current.getScore(); bestMove = move; } if(bestScore>=beta){ return MoveScore(bestMove,bestScore); } adaptiveBeta = max(alpha, bestScore) + 1; } } return MoveScore(bestMove,bestScore); } If someone can please help by explaining how to get this to work with a simple stack. Example code would be much appreciated. While c++ would be perfect, any language that demonstrates how would be great. Thank You.

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• Game Components, Game Managers and Object Properties

  - by George Duckett

  I'm trying to get my head around component based entity design. My first step was to create various components that could be added to an object. For every component type i had a manager, which would call every component's update function, passing in things like keyboard state etc. as required. The next thing i did was remove the object, and just have each component with an Id. So an object is defined by components having the same Ids. Now, i'm thinking that i don't need a manager for all my components, for example i have a SizeComponent, which just has a Size property). As a result the SizeComponent doesn't have an update method, and the manager's update method does nothing. My first thought was to have an ObjectProperty class which components could query, instead of having them as properties of components. So an object would have a number of ObjectProperty and ObjectComponent. Components would have update logic that queries the object for properties. The manager would manage calling the component's update method. This seems like over-engineering to me, but i don't think i can get rid of the components, because i need a way for the managers to know what objects need what component logic to run (otherwise i'd just remove the component completely and push its update logic into the manager). Is this (having ObjectProperty, ObjectComponent and ComponentManager classes) over-engineering? What would be a good alternative?

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• How can I place a ProgressBar in Android using Cocos 2d?

  - by Laxmipriya

  I want to place a horizontal progress bar in my Android application and I want to change its progress color. I used the following code, but the progress bar is not being displayed. CCProgressTimer progressBar = CCProgressTimer.progress("progressbar.png"); progressBar.setType(kCCProgressTimerTypeHorizontalBarLR); progressBar.setScale(5); progressBar.setAnchorPoint(CGPoint.ccp(0, 0)); progressBar.setPosition(CGPoint.ccp(0,0)); addChild(progressBar);

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• Where can I find a good tutorial to replicate Game Maker's surfaces and blend modes in XNA?

  - by Fred Dufresne

  I know Game Maker's surfaces exist in XNA (It's more the othe way around, XNA's surfaces exist in Game Maker), same thing for blend modes, since (I think) they both use DirectX. This is the question: "Where can I find a good tutorial to replicate Game Maker's surfaces and blend modes in XNA?" I'm using XNA 4.0 and Game Maker 8.1 Pro. Background I'm slowly moving from Game Maker to... Something else. I've learned some good C++ but DirectX is hardcore and OpenGL needs some pretty good understanding of the language to be able to use it correctly. XNA and C# together seemed like a good middle but the documentation is hard to understand for a newb like me. In the end, I chose to focus on XNA.

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• How do I set a touch listener in a child scene in AndEngine?

  - by Siddharth

  In my game, I want to implement touch listener for my child scene objects. Basically I tried all the possible way to implement this that I have usually done for my normal scenes, but those methods do not work here. Could somebody provide some guidance for setting touch area listener in child scene? Here is my code: menuScene.setTouchAreaBindingEnabled(true); menuScene.registerTouchArea(resumeButtonSprite); menuScene.registerTouchArea(retryButtonSprite); menuScene.registerTouchArea(exitButtonSprite); menuScene.setOnAreaTouchListener(new IOnAreaTouchListener() { @Override public boolean onAreaTouched(TouchEvent pSceneTouchEvent, ITouchArea pTouchArea, float pTouchAreaLocalX, float pTouchAreaLocalY) { System.out.println("Touch"); return true; } }); In this code, menuScene was a child scene activity. Also after research I found that my engine was stopped while the child scene was activated so the touch event is not detected. I want to implement a pause menu in my game so any desirable solution for a pause menu implementation would help.

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• Importing an object from Blender into a scene, rotation on X axis?

  - by Arne

  This is my situation: I save the scene with blender no export with any processing steps. Blender has x right y up -z into the scene for the view coordinates (OpenGL) I have x right y up -z into the scene for the view coordinates (OpenGl) Bleneder has x/y plane and z up as world coordinates I have x/y plane and z up as world coordinates I load the mesh with assimp directly from the blend file with absolutely no post processing. The object is rotated abount p/2 on the x-axis. Why?

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• Android in-game pause screen

  - by Max

  Right now Im calling a new activity with an xml-view when I pause my game, but Since I do this I need to use context in my real-time code, and this is causing a memory leak. Is there any preffered way to pause the game? By pause I mean if game is over, if I die, or if I press pause-button. Would a custom dialog work just aswell? this would mean I wont have to leave my main-activity while im in-game.

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• Problems with Level Architect, Citrus Engine, Flash

  - by Idan

  I am using the Citrus Engine to make a Flash game, and the Level Architect doesn't work well for me. Firstly, when I first launch it and open my project and my level, nothing is shown, no assets and not anything I have previously done with my level. To fix it, I open another project. The other project works fine, meaning I can see the assets and the level. Then I go back to the actual project I am working on, and the problem is fixed, only it does not fix the second problem: I can't add my own assests. I follow the manual and add tags like this: [Property(value="0")] But it doesn't change a thing in the level architect window (even after I close and reopen it). Any ideas? Thanks! Here's the code of the class I want to be shown in the Level Architect: package { import com.citrusengine.objects.PhysicsObject; import com.citrusengine.objects.platformer.Sensor; import flash.utils.clearTimeout; import flash.utils.setTimeout; /** * @author Aymeric */ public class Teleporter extends Sensor { [Property(value="0")] public var endX:Number=0; [Property(value="0")] public var endY:Number=0; public var object:PhysicsObject; [Property(value="0")] public var time:Number = 0; public var needToTeleport:Boolean = false; protected var _teleporting:Boolean = false; private var _teleportTimeoutID:uint; public function Teleporter(name:String, params:Object = null) { super(name, params); } override public function destroy():void { clearTimeout(_teleportTimeoutID); super.destroy(); } override public function update(timeDelta:Number):void { super.update(timeDelta); if (needToTeleport) { _teleporting = true; _teleportTimeoutID = setTimeout(_teleport, time); needToTeleport = false; } _updateAnimation(); } protected function _teleport():void { _teleporting = false; object.x = endX; object.y = endY; clearTimeout(_teleportTimeoutID); } protected function _updateAnimation():void { if (_teleporting) { _animation = "teleport"; } else { _animation = "normal"; } } } }

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• Texture mapping on gluDisk

  - by Marnix

  I'm trying to map a brick texture on the edge of a fountain and I'm using gluDisk for that. How can I make the right coordinates for the disk? My code looks like this and I have only found a function that takes the texture along with the camera. I want the cubic texture to be alongside of the fountain, but gluDisk does a linear mapping. How do I get a circular mapping? void Fountain::Draw() { glPushMatrix(); // push 1 this->ApplyWorldMatrixGL(); glEnable(GL_TEXTURE_2D); // enable texturing glPushMatrix(); // push 2 glRotatef(90,-1,0,0); // rotate 90 for the quadric // also drawing more here... // stone texture glBindTexture(GL_TEXTURE_2D, texIDs[0]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glPushMatrix(); // push 3 glTranslatef(0,0,height); // spherical texture generation // this piece of code doesn't work as I intended glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP); glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP); glEnable(GL_TEXTURE_GEN_S); glEnable(GL_TEXTURE_GEN_T); GLUquadric *tub = gluNewQuadric(); gluQuadricTexture(tub, GL_TRUE); gluDisk(tub, radius, outerR, nrVertices, nrVertices); gluDeleteQuadric(tub); glDisable(GL_TEXTURE_GEN_S); glDisable(GL_TEXTURE_GEN_T); glPopMatrix(); // pop 3 // more drawing here... glPopMatrix(); // pop 2 // more drawing here... glPopMatrix(); // pop 1 } To refine my question a bit. This is an image of what it is at default (left) and of what I want (right). The texture should fit in the border of the disk, a lot of times. If this is possible with the texture matrix, than that's fine with me as well.

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