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• I need help with 3d shading/lighting.

  - by Xavier

  How do you guys handle shading in a 3d game? I have a directional light source that shades one side of a tree made of cubes. The remaining 3 sides all get ambient shading only. So the 3d effect is lost when looking at two ambient shaded sides. Am I missing something? Should I be shading the side furthest from the light source even darker? I tried looking at Fallout 3 and it kinda looks like this is what they do however Minecraft appears to shade a grass mound with two opposite sides light and the remaining two opposite sides dark kinda giving the effect that there are two directional lights for the two light shaded sides and ambient light for the dark shaded sides.

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• OpenGL 2D Depth Perception

  - by Stephen James

  I have a 2D RPG game written in Java using LWJGL. All works fine, but at the moment I'm having trouble deciding what the best way to do depth perception is. So , for example, if the player goes in front of the tree/enemy (lower than the objects y-coordinate) then show the player in front), if the player goes behind the tree/enemy (higher than the objects specific y-coordinate), then show the player behind the object. I have tried writing a block of code to deal with this, and it works quite well for the trees, but not for the enemies yet. Is there a simpler way of doing this in LWJGL that I'm missing?

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• Physics engine that can handle multiple attractors?

  - by brice

  I'm putting together a game that will be played mostly with three dimensional gravity. By that I mean multiple planets/stars/moons behaving realistically, and path plotting and path prediction in the gravity field. I have looked at a variety of physics engines, such as Bullet, tokamak or Newton, but none of them seem to be suitable, as I'd essentially have to re-write the gravity engine in their framework. Do you know of a physics engine that is capable of dealing with multiple bodies all attracted to one another? I don't need scenegraph management, or rendering, just core physics. (collision detection would be a bonus, as would rigid body dynamics). My background is in physics, so I would be able to write an engine that uses Verlet integration or RK4 (or even Euler integration, if I had to) but I'd much rather adapt an off the shelf solution. [edit]: There are some great resources for physics simulation of n-body problems online, and on stackoverflow

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• 3D rotation tool. How can I add simple extrusion?

  - by Gerve

  The 3D rotation tool is excellent but it only lets you rotate 2D objects, this means my object is wafer thin. Is there any way to add simple extrusion or depth to a symbol? I don't really want to use any 3rd party libraries like Away3D or Papervision, this is overkill for my simple 2D game. I only want to do this creating a couple motion tweens if possible. More Details: Below is what my symbol looks like (just with a bit more color). The symbol does a little 3D rotation and then flies away, it's just for something like a scoreboard within the app.

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• ContentManager in XNA cant find any XML

  - by user36385

  Im making a game in XNA 4 and this is the first time I'm using the Content loader to initialize a simple class with a XML file, but no matter how many guide I follow, or how simple or complicated is my XML File the ContentManager cant find the file; the Debug keep telling me: "A first chance exception of type 'Microsoft.Xna.Framework.Content.ContentLoadException' occurred in Microsoft.Xna.Framework.dll". I'm really confuse because I can load SpriteFonts and Texture2D without a problem ... I create the following XML (the most basic Xna XML): <?xml version="1.0" encoding="utf-8" ?> <XnaContent> <Asset Type="System.String">Hello</Asset> </XnaContent> and I try to load it in the LoadContent method in my main class like this: System.String hello = Content.Load<System.String>("NewXmlFile"); There is something I'm doing wrong? I really appreciate your help

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• xna networking, dedicated server possible?

  - by Jake

  Hi I want to release my xna game to the XBOX platform, but I'm worried about the networking limitations. Basically, I want to have a dedicated (authoritative) server, but it sounds like that is not possible. Which is why I'm wondering about: a.) Using port 80 web calls to php-driven database b.) Using an xbox as a master-server (is that possible?) I like the sound of [b] , because I could write my own application to run on the xbox, and I would assume other users could connect to it similar to the p2p architecture. Anyone able to expand on theory [b] above? or [a] as worst-case scenario?

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• What is wrong with my Dot Product? [Javascript]

  - 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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• Good baseline size for an A* Search grid?

  - by Jo-Herman Haugholt

  I'm working on a grid based game/prototype with a continuous open map, and are currently considering what size to make each segment. I've seen some articles mention different sizes, but most of them is really old, so I'm unsure how well they map to the various platforms and performance demands common today. As for the project, it's a hybrid of 2D and 3D, but for path-finding purposes, the majority of searches would be approximately 2D. From a graphics perspective, the minimum segment size would be 64x64 in the XZ plane to minimize loaded segments while ensuring full screen coverage. I figure pathfinding would be an important indicator of maximum practical size.

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• What is a fast way to darken the vertices I'm rendering?

  - by Luis Cruz

  To make a lighting system for a voxel game, I need to specify a darkness value per vertex. I'm using GL_COLOR_MATERIAL and specifying a color per vertex, like this: glEnable(GL_COLOR_MATERIAL); glBegin(GL_QUADS); glColor3f(0.6f, 0.6f, 0.6f); glTexCoord2f(...); glVertex3f(...); glColor3f(0.3f, 0.3f, 0.3f); glTexCoord2f(...); glVertex3f(...); glColor3f(0.7f, 0.7f, 0.7f); glTexCoord2f(...); glVertex3f(...); glColor3f(0.9f, 0.9f, 0.9f); glTexCoord2f(...); glVertex3f(...); glEnd(); This is working, but with many quads it is very slow.. I'm using display lists too. Any good ideas in how to make vertices darker?

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• Setting effects variables in XNA

  - by Badescu Alexandru

  Hello ! I am currently reading a book named "3D Graphics with XNA Game Studio 4.0" by Sean James and have some questions to ask : If i create a effect parameter named lets say SpecularPower and have in my effect a variable named SpecularPower , if i do something like effect.Parameters["SpecularPower"].SetValue(3) That wil change the SpecularPower variable in my effect ? And a second question, not regarding the book : If i have a spaceship and i've created a "boost" functionality that speeds up my spaceship, what effects should i implement to create the impresion oh high speed ? I was thinking of making everything except my spaceship blurry but i think there would be something missing . Any ideas ? Regards, Alex Badescu

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• Orthographic Zooming with 0,0 at top/left

  - by Sean M.

  I'm trying to implement zooming on my 2D game. Since it's using orthographic projection, I thought it would be easy to implement zooming. After looking around the internet, I found a bunch of explanations and samples on how to do this if (0,0) is the center of the screen with the orthographic projection. The problem is, my ortho projection has (0,0) at the top-left (similar to XNA/Monogame, and a couple others). I could not find any examples about how to implement zooming to the center of the screen when the center is not (0,0). And help/links/code examples would be greatly appreciated.

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• Creating a python android application

  - by Harry

  I need help creating a android app on python. I'm creating an actual android game on python to use on my phone. I need suggestions of what app people would prefer. Anything you have have always wanted on your phone but no ones made it? Please post some suggestions below. I will start writing the code soon and will keep updating this post or creating a new ones asking new questions, so please keep an eye out. I also need help and software on how to start writing the code and how to test it. Thanks in advance.

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• Network Multiplayer in Flash

  - by shadowprotocol

  Flash has come a long way in the last decade, and it's a well-kept secret getting a flash game to connect to a multi-client server for chat and/or basic avatar movement in real time. Why has the industry as a whole not made this a common-knowledge type of thing yet? We keep pushing to the web but I am finding it incredibly difficult gathering learning material on this subject. Sure, I can find multi-client server socket tutorials in various languages (using select statements and/or threads to handle multiple socket connections), but in regards to Flash applications inside of a browser? NOPE! Can everyone please share what they know? :] It's a subject I'd really love to get into but I'm afraid I just honestly don't know enough about how to do it. Thanks!

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• Detecting End of Animation

  - by Will

  So I am making a death animation for a game. enemy1 is a UIImageView, and what I'm doing is when an integer is less than or equal to zero, it calls this deathAnimation which only happens once. What I want to do is use a CGPointMake right when the animation is finished being called. Note that before the deathAnimation is called, there is another animation that is constantly being called 30 times a second. I'm not using anything like cocos2d. if (enemy1health <= 0) { [self slime1DeathAnimation]; //How can i detect the end of this animation } This is how the animation is done -(void)slime1DeathAnimation{ enemy1.animationImages = [[NSArray alloc] initWithObjects: [UIImage imageNamed:@"Slime Death 1.png"], [UIImage imageNamed:@"Slime Death 2.png"], [UIImage imageNamed:@"Slime Death 3.png"], [UIImage imageNamed:@"Slime Death 4.png"], [UIImage imageNamed:@"Slime Death 5.png"], nil]; enemy1.animationDuration = 0.5; enemy1.animationRepeatCount = 1; [enemy1 startAnimating]; } If you need more code just ask

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• Direction of the bullet - how to have something else than left, right, top, bottom

  - by Florian Margaine

  I'm making a simple shooter game using canvas and javascript. The current code can be seen here. To know which way I want the bullet to be shot, I simply have a direction property that can have 4 values (left, right, bottom, top), and I can then calculate the next position of the bullet easily. However, I'd like to move the bullet to the mouse position, but I don't really see how to do this. How do I calculate the next position? I'm guessing there is some formula to calculate the line between two positions (the player's and the mouse's), but I don't have much idea yet. So there is no obstacle, but I don't see how to calculate this, and be able have the next position of the bullet at each frame.

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• How to use lemodev highscore plugin for unity?

  - by user3889649

  I am trying to add a server-sided highscore system to my game in unity. I have downloaded the free lemodev highscore plugin from the asset store but I cant figure out how to use it. I know where to put my server info and so on but other what are you supposed to do ? I added the main camera prefab that came with the package to my scene but other than adding an additional camera it did precisely nothing ( at least it seems that way ). Could anyone look into it and tell me how to use it ? The developer's website seems to have no information on the subject.

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• Poor mobile performance when running from Eclipse

  - by Yajirobe_LOL

  So after weeks of thinking my rendering code was bad, I accidentally discovered the following: Running my game on a Nexus S From Eclipse (Debug as - Android application): 12fps From the device while still attached to USB (getting log info in Eclipse still): 24fps From the device while not attached via USB: 56fps I was wondering if anyone else has issues like this? I mean, the problem really isn't a problem since the final release build will likely have good performance, but for the time being I don't want to have to keep (un)plugging my device in and out when testing code all day long. Is there some remedy for this or does anyone have any input/advice? Thanks.

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• Performance tracking/monitoring in games

  - by vitaliy kotik

  Let's say I have an online game with a downloadable client / browser plugin. I want to track performance of my software and automatically send summary to the server. Let it be fps, latency, load time, physics step calc. time, whatever... I also want tools to perform data analysis: per session stats, per hardware stats, avgs, totals, diagrams, etc. So that I could see what are the real world hotspots / bottlenecks. Is there any common out-of-the-box / SaS solution?

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• Development platform for 2D web and mobile games

  - by Robert Vella

  Is there a game development platform -- similar to Torque, or Unity -- which can be used to deploy 2D games on the following platforms: Web iOs Android Xbox Live Arcade (Preferred but not required) And which has an integrated or mature physics engine? Perhaps, even a built in editor? I've looked at the following possibilities but I've found something missing in each one. Of course in each case I may be guilty of misconception. Corona SDK (No web deployment, no windows support) Torque 2D (No web deployment) Flash + Flash Punk or Flixel (No native android deployment, and I'm not sure if it is stable on mobile platforms) Unity + SpriteManager2 (Not really optimised for 2D games, and I haven't seen enough advanced 2D examples -- like say platformers -- to really have any confidence in using it for something like this) Has anyone had any luck with this?

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• Efficient skeletal animation

  - by Will

  I am looking at adopting a skeletal animation format (as prompted here) for an RTS game. The individual representation of each model on-screen will be small but there will be lots of them! In skeletal animation e.g. MD5 files, each individual vertex can be attached to an arbitrary number of joints. How can you efficiently support this whilst doing the interpolation in GLSL? Or do engines do their animation on the CPU? Or do engines set arbitrary limits on maximum joints per vertex and invoke nop multiplies for those joints that don't use the maximum number? Are there games that use skeletal animation in an RTS-like setting thus proving that on integrated graphics cards I have nothing to worry about in going the bones route?

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• Cocos2dx- Draw primitives(polygons) on Update

  - by Haider

  In my game I'm trying to draw polygons on on each step i.e. update method. I call draw() method to draw new polygon with dynamic vertices. Following is my code: void HelloWorld::draw(){glLineWidth(1);CCPoint filledVertices[] = {ccp(drawX1,drawY1),ccp(drawX2,drawY2), ccp(drawX3,drawY3), ccp(drawX4,drawY4)};ccDrawSolidPoly( filledVertices, 4, ccc4f(0.5f, 0.5f, 1, 1 ));} I call the draw() method from the update(float dt) method. The engine is behaving inconsistently i.e. sometimes it displays the polygons and on other occasions it does not. Is it the right approach to do such a task? If not what is the best way to display large number of primitives?

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• Kepler orbit : get position on the orbit over time

  - by Artefact2

  I'm developing a space-simulation related game, and I am having some trouble implementing the movement of binary stars, like this: The two stars orbit their centroid, and their trajectories are ellipses. I basically know how to determine the angular velocity at any position, but not the angular velocity over time. So, for a given angle, I can very easily compute the stars position (cf. http://en.wikipedia.org/wiki/Orbit_equation). I'd want to get the stars position over time. The parametric equations of the ellipse works but doesn't give the correct speed : { X(t) = a×cos(t) ; Y(t) = b×sin(t) }. Is it possible, and how can it be done?

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• Xna Loading Screens

  - by Cyral

  I'm making a 2D XNA game. I'd like to implement loading screens when stuff has to load for a while. Like when I login to an account, connect to the server, and generate worlds. I'm pretty sure it needs to be multithreaded, because I want to be able to do something like "Generating World 10%...11%...". GenerateWorld() { //Call StartLoading("Generating World"); or something //Starter generating, Updating progress... //End loading screen and fade into world } Help appreciated, I'm new.

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• Rotate view matrix based on touch coordinates

  - by user1055947

  I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing origin. I have succeeded in moving the camera through rotation left or right, up or down based on the user dragging the finger, but my problem is obviously that after I drag my finger up/down and rotate say 90 degrees so my intial position of -z is now +y and still facing origin, if I drag my finger left/right I want to rotate from +y to +x, but what happens is it rotates around the pole +y. This is to be expected as I am mapping 2D touch drag coords to 3D space, but I dont know where to start trying to do what I want. Perhaps someone can point me in the right direction, I've been googling for a while now but I don't know what I want to do is called! Edit __ What I was looking for is called an ArcBall, google it for lots of info on it.

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• Level selection view - similiar to Angry Bird's

  - by Piotr

  I am making game and need to prepare view for level selection. Could you recommend me some opensource library which could I use? I need icons to vibrate after long pressing one of them, some callbacks after choosing them, possibility to prepare custom icon's view, page control and horizontal scrolling. I was trying to use OpenSpringBoard but weirdly couldn't see scrollview and pagecontrol working in this project - it seems that there's possibility to use only one page. On the other hand, myLauncher(https://github.com/dlinsin/myLauncher) isn't so easy to include in project, as I need a seperate view with some delegate methods. I need to be compatible with iOS 4.2

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