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• DOT implementation

  - by Denis Ermolin

  I have some DOT(damage over time) implementation problems. My game runs on 30 FPS speed. Current implementation is: let's say hero cast spell which make 1 damage per second. So on every frame i do (pseudo code): damage_done = getRandomDamage() * delta_time; I accumulate damage and when it becomes more then 0 then subtract rounded damage from current health and so on. With 30 FPS and 1 DPS it will be 1/33 = 0.05... We know that floats a not precise enough to sum 30 circulating decimals and have exact 1 in the end. But HP is discrete value and that's why 1 DPS will not have 1 damage after 1 second because value will be 0.9999..... It's not so big deal when you have 100000 DPS - +/- 1 damage will not be noticeable. But if i have 1, 5 DPS? How modern RPG's implemented DOT's?

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• Is there a way to prevent users from adjusting their gamma correction to 'cheat' their way out of a 'dark' area?

  - by Athix

  In almost every game I've come across that includes a dark situation designed to change the way a user interacts with the environment, there are always some players who turn up their monitor's gamma correction in order to negate the desired effect. Is there a way to prevent users from adjusting their gamma correction to 'cheat' their way out of a challenge? (the darkness) I'd imagine if you could reliably retrieve the current gamma correction of the user's monitor, you could use that to more or less prevent the advantage it would otherwise grant without causing the normal users any inconvenience.

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• Units issue when exporting from 3DS Max to XNA

  - by miguelSantirso

  I am working on a XNA game where we have defined that 1 XNA unit equals to 1 meter. Then, I set meters as system unit in 3DS Max and set to meters the units in the FBX exporter. However, when I export my models, they are much bigger in the game. Am I missing something? What should I do to avoid problems with my units? Investigating the FBX file, I noticed that I it has two values called UnitScaleFactor and OriginalUnitScaleFactor. They both are 100 when I export the files... And if I manually change UnitScaleFactor to 1, it works fine :S

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• Interactive Fiction engine and Tech Support - has anyone done this? [on hold]

  - by Larry G. Wapnitsky

  I've always been a big fan of Interactive Fiction and have been wanting to try my hand at it for a while. I have a need to create a decision tree for my tech support group (L1-L3) and feel as though presenting a decision tree in the form of an IF game would be rather interesting and helpful. I plan on using Inform7, but am curious if anyone has done anything like this in the past. If so, can you present examples, links to examples, opinions? Thanks, Larry

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• Multiple textures on a mesh created in blender and imported in xna

  - by alecnash

  I created a cube in blender which has multiple images applied to its faces. I am trying to import the model into xna and get the same results as shown when rendering the model in blender. I go through every mesh (for the cube its only one) and through every part but only the first image used in blender is displayed in every face. The code I am using to fetch the texture looks like that: foreach (ModelMesh m in model.Meshes) { foreach (Effect e in m.Effects) { foreach (var part in m.MeshParts) { e.CurrentTechnique = e.Techniques["Lambert"]; e.Parameters["view"].SetValue(camera.viewMatrix); e.Parameters["projection"].SetValue(camera.projectionMatrix); e.Parameters["colorMap"].SetValue(modelTextures[part.GetHashCode()]); } } m.Draw(); } Am I missing something?

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• How to achieve uniform speed of movement in cocos 2d?

  - by Andrey Chernukha

  I'm an absolute beginner in cocos2 , actually i started dealing with it yesterday. What i'm trying to do is moving an image along Bezier curve. This is how i do it - (void)startFly { [self runAction:[CCSequence actions: [CCBezierBy actionWithDuration:timeFlying bezier:[self getPathWithDirection:currentDirection]], [CCCallFuncN actionWithTarget:self selector:@selector(endFly)], nil]]; } My issue is that the image moves not uniformly. In the beginning it's moving slowly and then it accelerates gradually and at the end it's moving really fast. What should i do to get rid of this acceleration?

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• Computer Games Technolgy or Software Engineering?

  - by Suleman Anwar

  I'm in the last year of my college and going to university next year. Could you tell me what the difference between Software Engineering and Computer Games Technology is? I know a bit of both but don't know the actual difference. I'm kind off in a dilemma between these two. I want to be a programmer, I'd love to go into gaming but I heard getting a job within a computer games company is really hard.

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• Java applet game design no keyboard focus

  - by Sri Harsha Chilakapati

  THIS IS PROBABLY THE WRONG PLACE. POSTED ITHERE (STACKOVERFLOW) I'm making an applet game and it is rendering, the game loop is running, the animations are updating, but the keyboard input is not working. Here's an SSCCE. public class Game extends JApplet implements Runnable { public void init(){ // Initialize the game when called by browser setFocusable(true); requestFocus(); requestFocusInWindow(); // Always returning false GInput.install(this); // Install the input manager for this class new Thread(this).start(); } public void run(){ startGameLoop(); } } And Here's the GInput class. public class GInput implements KeyListener { public static void install(Component c){ new GInput(c); } public GInput(Component c){ c.addKeyListener(this); } public void keyPressed(KeyEvent e){ System.out.println("A key has been pressed"); } ...... } This is my GInput class. When run as an applet, it doesn't work and when I add the Game class to a frame, it works properly. Thanks

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• Why are textures always square powers of two? What if they aren't?

  - by Keavon

  Why are the resolution of textures in games always a power of two (128x128, 256x256, 512x512, 1024x1024, etc.)? Wouldn't it be smart to save on the game's file size and make the texture exactly fit the UV unwrapped model? What would happen if there was a texture that was not a power of two? Would it be incorrect to have a texture be something like 256x512, or 512x1024? Or would this cause the problems that non-power-of-two textures may cause?

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• Loading content (meshes, textures, sounds) in the background

  - by Boreal

  In my game, I am aiming for a continuous world, that is, a world where you can go anywhere without breaking the immersion through load times and "virtual seams". My world is broken up into regions, which are nodes in a graph. A region is considered adjacent to another if it can be travelled to or seen from that region. In order to keep this continuous, I want to preload the assets needed in the adjacent regions (such as world meshes, textures, and music) before they are actually used. As for actually loading the content, I use a manager that keeps at most one copy of each asset in memory at a time, accessible by its filename. When I try to access an asset, it loads it (if necessary) and then returns it. I can then unload any asset that is currently loaded to save memory. Clearly, I want to do this in the background so there are no hiccups. I assume I have to use threads in some way, but I'm not sure how.

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• What are the reasons for MMOs to have level caps [on hold]

  - by SamStephens

  In many MMOs players character progression is artificially capped, e.g. by level 60 or 90 or 100 or whatever. Why do MMOs have these level caps in the first place? Why not just allow characters to continue to arbitrary levels with a mathematically designed leveling system that keeps the leveling experience interesting and endless? Answers to this question may help us to see the reason behind the feature and decide if and how this should be implemented in our MMOs.

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• Bouncing ball slowing down over time

  - by user46610

  I use the unreal engine 4 to bounce a ball off of walls in a 2D space, but over time the ball gets slower and slower. Movement happens in the tick function of the ball FVector location = GetActorLocation(); location.X += this->Velocity.X * DeltaSeconds; location.Y += this->Velocity.Y * DeltaSeconds; SetActorLocation(location, true); When a wall gets hit I get a Hit Event with the normal of the collision. This is how I calculate the new velocity of the ball: FVector2D V = this->Velocity; FVector2D N = FVector2D(HitNormal.X, HitNormal.Y); FVector2D newVelocity = -2 * (V.X * N.X + V.Y * N.Y) * N + V; this->Velocity = newVelocity; Over time, the more the ball bounced around, the velocity gets smaller and smaller. How do I prevent speed loss when bouncing off walls like that? It's supposed to be a perfect bounce without friction or anything.

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• The how of a collision engine

  - by JXPheonix

  This is a very, very broad question - what is the general algorithm of how a collision engine works? No code in specific, but rather, just a general idea of how a collision engine does what it does, constantly refreshing the points of an object and comparing it to other objects? (see, I have the general gist of it here.) A collision engine is basically an engine used in games (generally) so that your player (call him Bob), whenever bob moves into a wall, Bob stops, Bob does not walk through the wall. They also generally handle the gravity in a game and environmental things like that.

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• Beggining OpenGL vs beggining DirectX and some question about the philosophical difference between them

  - by jokoon

  I'm begginning with Direct X at school, and my teacher said it was harder to begin with than OpenGL, but I read several things that in fact, Direct X was more advanced than OpenGL in terms of recent graphic cards features. Since I'm far from wanting to do top notch effects, which can already be implemented with existing engines and/or shaders, I wanted to know your opinion: Can OpenGL be considered like a more basic, KISS, hardware agnostic, graphic library to just do 3D with acceleration, and consider DirectX like a top notch, game-oriented graphic API that will always support the next-gen 3D chips ? Citation from wikipedia on http://en.wikipedia.org/wiki/Id_Tech_5 : John Carmack mentioned in his keynote at QuakeCon 2007 that the id Tech 5 engine will not be using the DirectX 10 API. I don't want to seem like I'm minding open source because Carmack does and because he is famous, it's just that android and iPhone are out there, and Direct X doesn't seems to me to be the necessary API to know, since Windows supports OpenGL, and since the 360 is just a console among other consoles.

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• HedgeWar code confusion

  - by BluFire

  I looked at an open source project(HedgeWars) that was built using many programming languages such as C++ and Java. While I was looking through the code, I couldn't help noticing that all the math and physics were gone from the Java code. HedgeWars I imported the project file called "SDL-android-project" which was a sub folder to "android build" and project files. My question is where is all the math and physics inside the code? Do I have to look at the C++ code in order to see it? I think Hedgewars was originally programmed in C++ but the files are confusing be because of its size and the fact that it has several programming languages inside.

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• Best way to detect if vec3 is between vec3(x) and vec3(y) in glsl

  - by elect

  As titled I am sampling from a texture and if the color is somehow gray [vec3(.8), vec3(.9)] and an uniform is 1 I need to substitute that color with another one I am not a glsl veteran but I am pretty sure there is a more elegant and compact (without mentioning faster) way than this: vec3 textureColor = texture(texture0, oUV); if(settings.w == 1 && textureColor.r > .8 && textureColor.r < .9 && textureColor.g > .8 && textureColor.g < .9 && textureColor.b > .8 && textureColor.b < .9)

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• What are good JS libraries for game dev?

  - by acidzombie24

  If I decide to write a simple game both text and graphical (2d) what libraries would I use? (Assume we are using a HTML5 compatible browser) The main things I can think of Rendering text on screen Animating sprites (using images/css) Input (capturing the arrow keys and getting relative mouse positions) Perhaps some preloading resource or dynamically loading resources and choosing order Sound (but I am unsure how important this will be to me at first). Perhaps with mixing and chaining sounds or looping forever until stop. Networking (low priority) to connect a user to another or to continuously GET data without multiple request (I know this exist but I don't know how easy it is to setup or use. But this isn't important to me. Its for the question).

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• 2D Platform Game Jumping

  - by Bradley Kreuger

  I'm currently writing a game in XNA for fun which uses C#. I have got my sprites loaded and when the character moves right he looks like he is running right and when he moves left he looks like he is running left. I been looking everywhere for a good coding example for how to create a jumping ability. I have read all the physics stuff that I can stand and it doesn't help when I can't figure out how to use say space bar to jump yet can't keep them from using space just jump again until they land.

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• Math > Logic for a Logarithmic Score Meter

  - by oodavid

  I'm trying to implement a score meter whereby I specify a maximum value (say 15,000) and I can render values on it in a logarithmic manner ie: +------+---+--+-++ +------+---+--+-++ |== | |====== | +------+---+--+-++ +------+---+--+-++ 200 pts 1,000 pts +------+---+--+-++ +------+---+--+-++ |============= | |================| +------+---+--+-++ +------+---+--+-++ 5,000 pts 15,000 pts + The upper bound needs to be variable, and need to be able to convert a score to a percentage, using the above mockup as an example: score2pct(15000, 200) = 0.2 score2pct(15000, 1000) = 0.4 score2pct(15000, 5000) = 0.8 score2pct(15000, 15000) = 1 Does anyone have any pointers for me?

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• Point[] and Tri not "could not be found"

  - by Craig Dannehl

  Hi I'm trying to learn how to load a .obj file using OpenTK in windows Forms. I have seen a lot of examples out there, but I do see almost everyone uses List, and Point[]. Code example show these highlighted like there IDE know what these are; for example List<Tri> tris = new List<Tri>(); but mine just returns "The type or namespace name 'Tri' could not be found" is there an include I need to add or a using I am missing. Currently have this using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Drawing; using OpenTK; using OpenTK.Graphics; using OpenTK.Graphics.OpenGL;

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• Having troubles with LibNoise.XNA and generating tileable maps

  - by Jon

  Following up on my previous post, I found a wonderful port of LibNoise for XNA. I've been working with it for about 8 hours straight and I'm tearing my hair out - I just can not get maps to tile, I can't figure out how to do this. Here's my attempt: Perlin perlin = new Perlin(1.2, 1.95, 0.56, 12, 2353, QualityMode.Medium); RiggedMultifractal rigged = new RiggedMultifractal(); Add add = new Add(perlin, rigged); // Initialize the noise map int mapSize = 64; this.m_noiseMap = new Noise2D(mapSize, perlin); //this.m_noiseMap.GeneratePlanar(0, 1, -1, 1); // Generate the textures this.m_noiseMap.GeneratePlanar(-1,1,-1,1); this.m_textures[0] = this.m_noiseMap.GetTexture(this.graphics.GraphicsDevice, Gradient.Grayscale); this.m_noiseMap.GeneratePlanar(mapSize, mapSize * 2, mapSize, mapSize * 2); this.m_textures[1] = this.m_noiseMap.GetTexture(this.graphics.GraphicsDevice, Gradient.Grayscale); this.m_noiseMap.GeneratePlanar(-1, 1, -1, 1); this.m_textures[2] = this.m_noiseMap.GetTexture(this.graphics.GraphicsDevice, Gradient.Grayscale); The first and third ones generate fine, they create a perlin noise map - however the middle one, which I wanted to be a continuation of the first (As per my original post), is just a bunch of static. How exactly do I get this to generate maps that connect to each other, by entering in the mapsize * tile, using the same seed, settings, etc.?

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• Formula for three competing heroes, each has one they can beat and one they're beaten by

  - by Georgiadis Abraam

  I am trying to design a game for a project I have, The main idea is: 3 Types of heroes 3 Stats per hero There are no levels involved so the differences must be located on stats. Fight logic - The logic of fight is that type1hero has good chances winning type2hero, type2hero has good chances type3hero and type3hero has good chances winning type1hero. For over a week I am trying to find a stats based formula that will allow me to fix this but I can't, I was meddling with numbers yesterday and it was decent but I can't extract the formula out of it. Could you please guide me or give me hints on how should I start creating formulas on a Non lvl game that fulfills the fight logic?

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• Starting out with OpenGL when most tutorials are out of date

  - by AUTO

  I'm sure there are already a bunch of questions like this asked, but the constant updating of the OpenGL library throws them all away, and in a month or two, the answers here will be worthless again. I am ready to start programming in OpenGL using C++. I've got a working compiler (DevCpp; do NOT ask me to switch to VC++, and don't ask me why). Now I'm just looking for a solid tutorial on how to program with OpenGL. My assistant found the tutorial provided by NeHe Productions, but as I've come to find out, it's WAY OUT OF DATE! (although I did pull together a basic window to support an OpenGL canvas) Then I went online, and found the OpenGL SuperBible, which apparently uses freeglut? But what I'd like to know is whether or not SuperBible 5th edition is up to date any longer. The suggestion to freeglut I found said the latest version was 2.6.0 but now it's 2.8.0! Is the OpenGL SuperBible still a good, and fairly up-to-date place to start? Is there a better place to go to learn OpenGL? Am I allowed to simply store freeglut in the DevCpp include directory (maybe in GL), or is there some important procedure? Are there any comments or suggestions that I didn't think to ask since I'm only just beginning? @dreta cleared some things up for me, so now I have a better idea of what to ask: I think I'd like to start out with OpenGL using a wrapper library instead of directly accessing OpenGL.I just think that, for a beginner, it would be easier for me to program and get good results, while I don't yet have to understand all the grimy details (as @stephelton mentioned). The problem is, I can't find any library that doesn't have undefined references to no longer supported functions. Freeglut sounds operational, but it still uses GLU.Does anyone know what I can do?Also, I tried compiling the first SuperBible's source, but I got errors since GLAPI is not being defined as a type, the error originating in the GLU library. I'd like to use the SuperBible, but I don't know how to fix this.

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• Drawing an outline around an arbitrary group of hexagons

  - by Perky

  Is there an algorithm for drawing an outline around around an arbitrary group of hexagons? The polygon outline drawn may be concave. See the images below, the green line is what I am trying to achieve. The hexagons are stored as vertices and drawn as polygons. Edit: I've uploaded images that should explain more. I want to favour convex hulls because it's conveys an area of control more quickly. Each hexagon is stored in a multidimensional array so they all have x and y coordinates, I can easily find adjacent hexagons and the opposite vertex, i.e. adjacentHexagon = getAdjacentHexagon( someHexagon, NORTHWEST ) if there isn't a hexagon immediately adjacent it will continue to search in that direction until it finds one or hits the map edges.

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• Unity3D : Retry Menu (Scene Management)

  - by user3666251

  I'm making a simple 2D game for Android using the Unity3D game engine. I created all the levels and everything but I'm stuck at making the game over/retry menu. So far I've been using new scenes as a game over menu. I used this simple script: #pragma strict var level = Application.LoadLevel; function OnCollisionEnter(Collision : Collision) { if(Collision.collider.tag == "Player") { Application.LoadLevel("GameOver"); } } And this as a 'menu': #pragma strict var myGUISkin : GUISkin; var btnTexture : Texture; function OnGUI() { GUI.skin = myGUISkin; if (GUI.Button(Rect(Screen.width/2-60,Screen.height/2+30,100,40),"Retry")) Application.LoadLevel("Easy1"); if (GUI.Button(Rect(Screen.width/2-90,Screen.height/2+100,170,40),"Main Menu")) Application.LoadLevel("MainMenu"); } The problem stands at the part where I have to create over 200 game over scenes, obstacles (the objects that kill the player) and recreate the same script over 200 times for each level. Is there any other way to make this faster and less painful?

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