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• How to calculate shot angle and velocity to hit a moving target?

  - by Guen

  I am developing a 2D Android game and I am making an aiming algorithm for AI projectiles to hit enemies either following a path, or free moving. At the moment it just calculates where the target will be after a distance and fires a projectile to meet it at that distance. Of course this means varying the projectile speed to meet the target. Does anyone have any tips for a simple-ish algorithm (optimal-ish) to calculate when the projectile needs to fire and where it needs to aim if it can only travel at a constant velocity? Say the projectile goes twice the speed of the target? The only way I can think of involves searching and seems quite large.

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• Rotate an object given only by its points?

  - by d33tah

  I was recently writing a simple 3D maze FPP game. Once I was done fiddling with planes in OpenGL, I wanted to add support for importing Blender objects. The approach I used was triangulization of the object, then using Three.js to export the points to plaintext and then parsing the result JSON in my app. The example file can be seen here: https://github.com/d33tah/tinyfpp/blob/master/Data/Models/cross.txt The numbers represent x,y,z,u,v of a single vertex, which combined in three make a triangle. Then I rendered such an object triangle-by-triangle and played with it. I could move it back and forth and sideways, but I still have no idea how to rotate it by some axis. Let's say I'd like to rotate all the points by five degrees to the left, how would a code doing it look like?

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• Assigning a different texture based on picking(XNA)

  - by Thomas Carmichael

  I'm making a game using XNA. I have some simple objects like cube and sphere, and I would like to change the texture of one face of these objects based on picking. That is, when the cursor is over one face, it turns red. The only way I've seen to do this is to overload the content processor as here: http://xbox.create.msdn.com/en-US/education/catalog/sample/picking_triangle but it seems like it shouldn't be this complicated. I'm using .x models, and would like to be able to implement this for more complex models in the future beyond cubes/spheres/etc. Is this the best/only way to go about it? I'll figure that out if that's what is necessary, but it seems that there would be a simpler solution to load a different texture to a face than I've seen, I just don't know what it is.

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• How can I make a character move forward in a certain direction?

  - by Shaun Wild

  I have an entity class which is updated every game tick. Let's just assume said entity moves forward constantly. What i want to know is, how can i make it so that i can give an angle to a function and it will make my entity move in that direction. let's say for example moveForward(90); Would make my character move to the right, or for example declaring my rotation as a global Integer: moveForward(rotation); rotation++; Would make my entity move around in a small circle, I assume this includes some kind of vector math, which I haven't done any studying on so a brief explanation of that if it's necessary would be nice. I would appreciate a small code snippet and an explanation I can analyze, thanks in advanced :)

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• Best way to develop a level from Top down image using 3dmax

  - by fire'fly

  I have to create a game level from a top down view of an area. I used a plane converted to an editable poly to do the job. I used edges to create the top view of roads, walkways and parks so that i can extrude/edit them later. My problem is the curves in the road look blocky I tried appying mesh smooth modifier on the final model but that interfered with material mapping. Again i tried it on the plane without the extrusions and still the modifier does not work(The roads loose their shape). I know one way to solve the problem is to add more vertices on the curve and transform their location to create a more natural curve but i have a lot of curves so before doing it manually i need to know if there is a tool that refines the curves. Also i need to know if there is a better or proper way of doing the task.

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• How to create a 2D map?

  - by Kaizer

  I'm new to game development and I want to try it out, like many others amongst us :) I need to create a gridmap. The map needs to be divided in squares. Each square represents a location. For example: x:10 - y:10 The width and height of the square should be able to be set. And offcourse also the amount of squared. I will develop in MVC .NET Can someone show me the right direction ? kind regards PS: Some nice tutorial links are always welcome :)

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• Libgdx change color of Texture at runtime [on hold]

  - by Springrbua

  i allready asked this on Stackoverflow, but i think this question may belong here. In a Libgdx game i have some Animations for my Player. All the Frames for this Animation are inside a TextureAtlas. The Player Textures show a human, with a white T-Shirt. The T-Shirt is the only white part of the Player. Now i want to be able to replace the white color with red for Player1, with green for Player2 and so on. How can i do that, without loosing the advantage of the TextureAtlas (Texture switching)? Ofc 1 way would be to store 4 versions of every Frame, for 4 different Players (colors). But there are games out there, where you can fully customize the Player, give him a blue hat, red pants and pink shirts and so on. How can this be done? Thanks a lot! EDIT: The question on Stackoverflow

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• Physics for moving blocks

  - by Gabson

  I'm working on a 2D game for windows phone where the player moves blocks around to bounce a laser beams. I need to create some simple physics for moving the blocks. For the moment I have a simple collision class, telling me if two rectangles collide. But that's not enough because when I'm moving a block the rectangle/rectangle function doesn't work. By Doesn't work i mean,I manage the collision but I don't how to stop the block mooving while the user sliding the block. The collision response for the block I want is if the user tries to slide it on another object, the block should slide up against the other object and not overlap. How would I go about implementing this functionality?

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• 2d engine with WebGL

  - by Philipp

  I am currently developing a HTML5 canvas game with a sprite-based 2d engine. The engine is working well so far, but now I thought that I could maybe add some cool graphic effects when I would re-implement the whole engine with WebGL. The whole graphic engine would stay strictly two-dimensional (think of it as a 3d world where the z coordinate of all vertices is 0.0). What I hope to gain from this is the ability to use pixel shaders to create special effects. I also think that the performance could improve. What do you think about that plan?

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• Splashing Liquid Using Cocos2d

  - by Maverick

  I am new to game development in iOS. My problem is that I want to give a water splash effect on the screen as like someone has just randomly thrown water from any corner of the screen. I will be grateful to know any tutorials, or libraries that wil help me achieving this effect. Thanks in advance. Edit: Sample Liquid Simulation I wanted to simulate the behavior like this IMAGE. Like a liquid is poured in glass. I hope it clears what I asked. Thanks for your precious time.

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• Placing items randomly in a dynamically generated terrain

  - by Programlocura

  I'm currently working on a 'Tiny wings' like game. I've already asked about the angle of the items in curved lines and i solved (thank you for responses),i'm currently placing the items in random positions, but the terrain it's dynamically and i don't get this working. I've a vector with the points of the terrain, and i'm doing something similar to this (Iterating trough vector): if( _SPManager && i % 15 == 0 && i != 0 ) { if ( _settings.specialPoints && _currentPoints < _settings.specialPoints ) { _SPManager.addPoint( _hillsPosition[i].x , _hillsPosition[i].y ); _currentPoints++; } } But it isn't working as i expected. It isn't displaying the right number of items (Always shows less than i specified). How do i should place the items? Thanks :)

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• How do I render an entire frame to a Texture2D?

  - by redcodefinal

  I asked a question here: C# XNA Make rendered screen a texture2d But, I ended up not getting the exact result I was looking for since I didn't ask the question right. In a game I am writing, I render an extremely large city out of objects, this can cause lag when moving the camera to view things that are off screen. I need a way to render then ENTIRE city, even the stuff that is off screen, and make it into a Texture2D. The answer I chose for the last one didn't work entirely right because it only gets what is on screen, not what is off.

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• Matrix camera, movement concept

  - by NoFace

  I was talking to some guy. He said that my movement concept in game is bad. When left or right arrow is pressed I'm scrolling background what makes you feel that player is moving (player's X remains same). So... he told me something about matrix view. I should create all walls and platforms static and scroll only the camera and move player's rectangle. I did a little research in Google, but nothing found. Can you tell me anything about it? How to start? Maybe links, books and resources? My programming language is Java (2d). Thank you!

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• Make the player run onto stairs smoothly

  - by misiMe

  I have a 2D Platform game, where the player Always runs to the right, but the terrain isn't Always horizontal. Example: I implemented a bounding-box collision system that just checks for intersections with player box and the other blocks, to stop player from running if you encounter a big block, so that you have to jump, but when I put stairs, I want him to run smoothly just like he is on the horizontal ground. With the collision system you have to jump the stairs in order to pass them! I thought about generating a line between the edges of the stairs, and imposing the player movement on that line... What do you think? Is there something more clever to do?

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• Sound Delay With AVAudio Player

  - by Will Youmans

  I'm using the following code in my viewDidLoad to load a sound: NSURL * url = [NSURL fileURLWithPath: [NSString stringWithFormat:@"%@/Moto - Hit Sound.mp3", [[NSBundle mainBundle] resourcePath]]]; NSError * error; hitSoundPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:url error:&error]; hitSoundPlayer.numberOfLoops = 0; Then I'm using this in a void method to play the sound: if(CGRectIntersectsRect(main.frame, enemy1.frame)){ [hitSoundPlayer play]; } This does seem to work, however the first time the sound is played there is a lot of lag and the game stops temporarily. I'm using this same method for when in an IBAction and it works fine, it must be the fact that it's also detecting a collision that makes the sound lag. If I want to be able to play sounds quickly and on the spot without any sort of lag am I doing the right thing? Do I want to use another method? I'm not using any frameworks like cocos2d. If you need to see any more code just ask.

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• Can not export JARS in lwjgl!

  - by NerdyLegend

  I did it before but for some reason it's doing the stupid problem again. I want to export as a regular Jar file, not a folder full of files. I export it like in Oskar Veerhoak. cmd says Exception in thread "main" java.lang.RuntimeException: Resource not found: res/F lubberFlap.png at org.newdawn.slick.util.ResourceLoader.getResourceAsStream(ResourceLoa der.java:69) at com_FlubberSpace.MainFS.main(MainFS.java:118) I tested it out with my other project with the same code pretty much. This is how I load my Textures wood = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("res/wood.png")); of course it works fine in eclipse but not after export. I havn't tried giving the previous game its' own project, I have it in a package. Can someone record how to export properly? I want a jar file that you just double click to start it. I also want it so nobody can extract the files and see my classes and res.

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• 3D Location Handling

  - by tgrosinger

  I am thinking about making a simulator type game that will involve having lots of small objects in a 3D space. What is the typical solution for handling these objects? The first thing that comes to mind is a 3D Array, but I can't help but think there is a more efficient solution. Another idea that comes to mind is objects having possession of smaller items. For example a House possesses a Table which possesses a Cup and Bowl. The final way I can think of handling this is just having an array of "objects" that each have an x, y, z value. While this would make storing them easy I do not understand how you would detect collisions without just looking at every possible object and checking to see if it is in the way. Are there other ways of holding onto these objects that is more efficient?

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• How can I implement smooth rotation from one direction to another?

  - by user1759052

  I'm having a problem with animating rotations with 1Matrix.CreateRotationY() with my basic 3D game. Based on where you click the mouse, I want the 3D object to rotate to that direction and then move. I am using this to determine the target direction: float rot = (float)(Math.Atan2(X, Z)); It gives me the correct value, but I am not sure how to handle the rotation animation from current direction to new direction. I've tried a few things, but to no avail. Do you guys know of any good ways of solving this issue?

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• I finished "Beginning Android Games", should I use its framework?

  - by orod

  I've worked through Mario Zechner's "Beginning Android Games" and have made my own pong and asteroids game using the framework used in the book. I have also downloaded the source code for Replica Island and am able to run that. I like Replica Island's framework over the one I made from reading the book. Some differences are that Replica Island uses different activities for each screen instead of Zechner's Screen class and that Replica Island can use a lot of textures and isn't limited to textures with dimensions of powers of 2. If I'm serious about writing games and apps for Android should I learn Replica Island's framework and use that instead of the one I made while reading Zechner's book?

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• Managing shots of the player

  - by Bitbridge

  I'm currently developing a 2D Jump'n'Run and the situation is the following: The player has different weapons he can collect and is then able to shoot the weapon's projectiles (laser, rockets, whatever). In my previous game (space shooter) I just had a manager class for all the weapon-shots, it stored them in a container and then updates and draws every single one. When the "shoot-event" occurred, the "ProjectileManager" was notified and it added the wanted projectile. The input for player action is handled in the player-class, so the player would have to know the manager to call the function of the manager. I also have a collisionManager, that checks for collisions between, for example, enemies and the projectiles and then notifies these objects. However, I somehow have the feeling, that I shouldn't use this approach and that there might be a better way to handle this. I know, the question is a bit vague, I'm pretty much just looking for input and ideas to improve my design.

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• Color based collision detection

  - by user1486826

  I am making a game where you fly a ship around some randomly generated planets. Since I am using a for loop to draw over 5000 planets, using the rectangle class or an oval-type class for this is not an option, since creating many objects will severely affect performance. Bitmasking each planet will likely result in performance issues too, so the only candidate is color based collision detection, because I don't need to apply some sort of object to everything I want to check for collisions. Is any way to check the perimeter around the ship for a certain color?

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• Action Script 3.0 datatype to match C++ iterator? (Code convertion)

  - by user919496

  I am developing a game with Action Script 3.0 using Starling Framework, converting it from C++ C++ Code : for (std::vector<MyObject*>::iterator i = m_listEnemy->begin();i!= m_listEnemy->end();) { (*i)->update(dt); if ( (*i)->m_Hp <=0 ) { (*i)->release(); i = m_listEnemy->erase(i); continue; } i++; } MyObject is the class. What Action Script 3.0 data type matches the C++ iterator? Also , how can I convert this C++ code to Action Script 3.0 code? Thanks in advance!

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• XNA tempory pause

  - by Marivs

  I need to do a temporary pause. If I do a collision with an enemy I want to pause the game for 1.5 seconds. Take a look here to my code: bool tPause; float timer; public ovveride Update(GameTime gameTime) { if(!tPause) { //... if(enemy.rectangle.Intersects(player.rectangle)) { timer+=(float)gameTime.ElapsedGameTime.TotalMilliseconds; tPause=true; if(timer>1500) { tPause=false; timer=0; } } //... } } It doesn't function.

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• Disposing of ContentManager increases memory usage

  - by Havsmonstret

  I'm trying to wrap my head around how memory management works in XNA 4.0 I've created a screen management test and when I close a screen, the ContentManager created by that screen is unloaded. I have used ANTS Memory Manager to look at how the memory usage is altered when I do this, and it gives me some results which makes me scratch my head. The game starts with loading two textures (435kB and 48,3kB) which puts the usage at about 61MB. Then, when I delete the screen and runs Unload on the ContentManager, the memory usage drops to 56,5MB but instantly after goes up to 64,8MB. Am I doing something wrong or is this usual for XNA games? Do I have to dispose of everything the ContentManager loads seperatly or do I need to do something more to the ContentManager? Thanks in advance!

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• Unused frame(window) management

  - by Serhiy

  Hey guys, I'm rewriting my game now using software designing patterns and want to do the code, most correct I can. While implementing MVC(Model View Controller) I got a question which I would like to discuss or to hear some opinions of experts. The question is about management of unused frames... For example next sequence of windows: ResourceLoadingWindow - LoginWindow - GameWindow Definetly that I don't want to reuse ResourceLoadingWindow , since I'm using Java Applet and I don't see any situation when I will need to reuse it. The different story is about LoginWindow, which can be reused a lot of times, because some player would want to Logout and come back again in few minutes for example. I would like to know, following the MVC structure, should I destroy window, removing it from ContentPane or just hide? Maybe I need to unregister it from controller or I shouldn't do so? Thanks in adavance.

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