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• How can I easily create cloud texture maps?

  - by EdwardTeach

  I am making 3d planets in my game; these will be viewed as "globes". Some of them will need cloud layers. I looked at various Blender tutorials for creating "earth", and for their cloud layers they use earth cloud maps from NASA. However I will be creating a fictional universe with many procedurally-generated planets. So I would like to use many variations. I'm hoping there's a way to procedurally generate cloud maps such as the NASA link. I will also need to create gas giants, so I will also need other kinds of cloud texture maps. If that is too difficult, I could fall back to creating several variations of cloud maps. For example, 3 for earth-like, 3 for gas giants, etc. So how do I statically create or programmatically generate such cloud maps?

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• Directory paths for resources and assets

  - by The Communist Duck

  If I have a file stucture for my final, released game something like: Main folder Media Images Other assets Sounds Executable List item And a different one for my 'in development' project, with the same Media folder but: Main Source and .obj, etc. Media with everything Bin folder with executable I obviously cannot hardcode file pathnames into this, like: "../Media/Image/evilguy.png" or "Media/Image/foo.jpg" because they wouldn't work with one of the builds and would require a lot of switching names. Instead, does it make sense for my resource manager, that loads everything, to have some kind of prefix path? Then, I can just do Get("foo.jpg") or Get("Sounds/boom.ogg") And simply switch out, for the final release, the ctr argument from the relative path for the development build to the release layout? If not, how have other people sorted these sorts of things out?

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• How can I test if a point lies between two parallel lines?

  - by Harold

  In the game I'm designing there is a blast that shoots out from an origin point towards the direction of the mouse. The width of this blast is always going to be the same. Along the bottom of the screen (what's currently) squares move about which should be effected by the blast that the player controls. Currently I am trying to work out a way to discover if the corners of these squares are within the blast's two bounding lines. I thought the best way to do this would be to rotate the corners of the square around an origin point as if the blast were completely horizontal and see if the Y values of the corners were less than or equal to the width of the blast which would mean that they lie within the effected region, but I can't work out

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• Creating a level editor event system

  - by Vaughan Hilts

  I'm designing a level editor for game, and I'm trying to create sort of an 'event' system so I can chain together things. If anyone has used RPG Maker, I'm trying to do similar to their system. Right now, I have an 'EventTemplate' class and a bunch of sub-classed 'EventNodes' which basically just contain properties of their data. Orginally, the IAction and IExecute interface performed logic but it was moved into a DLL to share between the two projects. Question: How can I abstract logic from data in this case? Is my model wrong? Isn't cast typing expensive to parse these actions all the time? Should I write a 'Processor' class to execute these all? But then these actions that can do all sorts of things need to interact with all sorts of sub-systems.

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• Break the object body

  - by Siddharth

  In my game, I want to break the object body creating slicing effect. After research I found that I have to use ray casting but I don't know how to use it. If some one know how to break the physics body then please provide information to me. EDIT : I don't have any logic how to do that in andengine. Only I have some link to do slicing http://www.emanueleferonato.com/2012/03/05/breaking-objects-with-box2d-the-realistic-way/ Yes I have to slice physics body into two parts. My physics body have 2d objects.

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• projected textures not appear on the "back" of the mesh as well?

  - by user975135

  I want to create blood wounds on my character's bodies by using projected textures. I've watched some commentaries on games like Left 4 Dead and they say they use projected textures for the blood. But the way projected textures work is that if you project a texture on a rigged character, say his chest, it will also appear on his back. So what's the trick? How to get projected textures appear only on one "side" of the mesh? I use the Panda3D game engine, if that will help.

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• Large resolution differences

  - by Robin Betka

  I want to develop a game on multiple devices such as PC, Android or IOS. Want it to be in 1080p, but that means a massive scale down for the smartphones. I know how to do that, just render everything on a 1080p rendertarget and then render it on the screen smaller. But what should I do so that the scalling down doesn't look bad and blury? I can't do it vector based or anything because the sprites simply need a specific size. Should I make the sprites power of two size to get some nice mipmapping? And which other settings can I do? Or should I rather go with a lower resolution but then having a little bit worse look PC version? The performance seems not to be a problem for me, so would be sad not using 1080p because of other problems.

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• Determine corners of a specific plane in the frustum

  - by Takumi

  I'm working on a game with a 2D view in a 3D world. It's a kind of shoot'em up. I've a spaceship at the center of the screen and i want that ennemies appear at the borders of my window. Now i don't know how to determine positions of the borders of the window. For example, my camera is at (0,0,0) and looking forward (0,0,1). I set my spaceship at (0,0,50). I also know the near plane (1) and the far plane(1000). I think i'd have to find the 4 corners of the plane in the frustum whose z position is 50, and with these corner i can determine borders. But i don't know how to determine x and y.

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• Server-side Input

  - by Thomas

  Currently in my game, the client is nothing but a renderer. When input state is changed, the client sends a packet to the server and moves the player as if it were processing the input, but the server has the final say on the position. This generally works really well, except for one big problem: falling off edges. Basically, if a player is walking towards an edge, say a cliff, and stops right before going off the edge, sometimes a second later, he'll be teleported off of the edge. This is because the "I stopped pressing W" packet is sent after the server processes the information. Here's a lag diagram to help you understand what I mean: http://i.imgur.com/Prr8K.png I could just send a "W Pressed" packet each frame for the server to process, but that would seem to be a bandwidth-costly solution. Any help is appreciated!

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• Keeping rotation between two objects

  - by user99

  In my XNA game I have two objects that collide. When the first object collides with the other it is able to latch on to it and move it about the world. I am having a problem with the math here (Math isn't my strong point). I currently have the second object latch on to the first and move around with it, but I cannot get it to keep it's original direction. So, if the object is facing up it should keep this direction relative to how it is being rotated with the original item. Any tips on how I could best to achieve this?

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• Calculating an orbit and approach velocties

  - by Mob

  I have drones in my game that need to approach and orbit a node and shoot at it. Problem is I want to stay away from a real physics simulation, meaning I don't want to give the node and drone a mass and the drone's thrusters' a force. I just want to find the best way to approach and then enter orbit. There was a pretty good answer about using bezier curves and doing it that way, but that is essentially a tween between two fixed points. The nodes are also moving as the drones enter orbit.

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• 2D Tile-based terrian generation

  - by a240

  As a summer project I decided it would be fun to make a flash game. Right now I'm going for something like the look of http://www.terraria.org/. It's been a lot of fun, but today I've hit a snag. I need a way to generate my worlds. I've read up Perlin Noise ( http://freespace.virgin.net/hugo.elias/models/m_perlin.htm ) as a possibility, but I my attempts have given me sporadic looking results. What are some techniques used to generate these 2D tile-based worlds? Ideally I would like to be able to generate mountains, plains, and caves.

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• Sanity checks vs file sizes

  - by Richard Fabian

  In your game assets do you make room for explicit sanity checks, or do you have some generally expected bounds which you assert? I've been thinking about how we compress data and thought that it's much better to have the former, and less of the latter. If your data can exceed your normal valid ranges, but if it does it's an error, then surely that implies you're not compressing the data well enough? What do you do to find out if your data is compressed as far as it can be, and what do you use to ensure your data isn't corrupted and ensure it's an official release? EDIT I'm not interested in sanity checking the file size, but instead, how you manage your sanity checks and whether you arrange the excess size caused by the opportunity to do sanity checks by using explicit extra data, or through allowing the data enough file space (data member size) to be out of valid range and thus able to be checked merely by looking at the asset in memory after loading.

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• Skeletal Animation - Automatically apply skeleton to model

  - by Randomman159

  Looking at websites such as mixamo.com or some game's development systems such as the animation editor for Overgrowth (http://www.youtube.com/watch?v=-RpqbC5-Z0E), i see that the skeleton in these situations is automatically being applied to the models. I really don't expect (though wouldn't mind) code that does this, but i really am looking for some sort of pointer in the direction, or how they go about this. If any of you have done this, or know how to, please do reply, i don't want to spend the next week trying to crack it, then another to actually code it :P Thanks all :) Just for a bit more information, i am in C# working with OpenTK with my own custom model loader, etc. but i can easily adjust any given code / concept to fit with mine :)

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• Curiosity on any Smartphones that Run on Android 2.3.3 with Different Screen Reoslution

  - by David Dimalanta

  I have a question regarding about any smartphones that run only in Android 2.3.3. Is the size of screen or the screen resolution is always HVGA or does it have capable of running this OS (Android 2.3.3) on big screen size (4" to 5") at about 720x1280? I'm thinking of the game's compatibility depending on the version of the Android OS and the screen resolution, which affects the change of coordinates especially for assigning touch buttons and drag-n-drop at exact location, before I'm gonna decide to make one. My program works on the Android 4 ICS and Jellybean, however, will that work on Android 2.3.3 in spite of precise touch coordinate or just dependent on the screen resolution (regardless how large it is) as the X and Y coordinate? And take note, I'm using Eclipse IDE for Java developers.

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• Tiny Wings - Placing items

  - by Federico

  I'm currently developing a Flash game like 'Tiny Wings'. I have a lot of work done, but i'm currently working on placing the items ( coins and obstacles ) on the terrain. My player it is moving on a auto-generated terrain (based on Emanuele Feronato's tutorials) so every time the player's x position is greater than (screenWidth + x) another hill is generated and so on. I'm currently having problems placing the items in a correct angle and put 5 or more items together on a hill. Could you please help me with this? Thanks, Regards. PS: This is the URL to the Emanuele Feronato post and the code to make the hills http://www.emanueleferonato.com/2011/10/04/create-a-terrain-like-the-one-in-tiny-wings-with-flash-and-box2d-%E2%80%93-adding-more-bumps/

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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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• Target tracking with a small delay (actionscript 3.0)

  - by John Dodson

  I'm having trouble thinking of a good method to track my character with an enemy attack. Of course, I don't want the attack to track my character's current position; I want it to track where the character was about 1 second before (so you can move around and make the attack miss and loop around you sort of a thing). The general structure of my game uses a timer to update all of my events. I have a timer going off every 25 milliseconds that updates everything, including my player's position and the enemies position. Right now I just have the enemy attack directly targeting my character....which works fine except that it's impossible to escape =p. Let me know if I didn't supply enough details. My approach was going to basically be get my character's position from about 1 second ago, then have the enemy target that position, the only problem is I can't think of a good way to get my character's position from previous times. Thanks for the help!

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• Super-quick MIDI generator with nonrestrictive license?

  - by Ricket

  I'm working on my Ludum Dare entry and trying to figure out how in the world I'm ever going to get background music. I found WolframTones, but the license is too restrictive: Unless otherwise specified, this Site and content presented on this Site are for your personal and noncommercial use. You may not modify, copy, distribute, transmit, display, perform, reproduce, publish, license, create derivative works from, transfer, or sell any information or content obtained from this Site. For commercial and other uses, contact us. But I really like the interface! It's a lot like sfxr - click a genre and download a song. That's so cool. Is there another program that does this same sort of thing but without a restrictive license, so that I can generate a bgm and use it in my game?

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• Obtain rectangle indicating 2D world space camera can see

  - by Gareth

  I have a 2D tile based game in XNA, with a moveable camera that can scroll around and zoom. I'm trying to obtain a rectangle which indicates the area, in world space, that my camera is looking at, so I can render anything this rectangle intersects with (currently, everything is rendered). So, I'm drawing the world like this: _SpriteBatch.Begin( SpriteSortMode.FrontToBack, null, SamplerState.PointClamp, // Don't smooth null, null, null, _Camera.GetTransformation()); The GetTransformation() method on my Camera object does this: public Matrix GetTransformation() { _transform = Matrix.CreateTranslation(new Vector3(-_pos.X, -_pos.Y, 0)) * Matrix.CreateRotationZ(Rotation) * Matrix.CreateScale(new Vector3(Zoom, Zoom, 1)) * Matrix.CreateTranslation(new Vector3(_viewportWidth * 0.5f, _viewportHeight * 0.5f, 0)); return _transform; } The camera properties in the method above should be self explanatory. How can I get a rectangle indicating what the camera is looking at in world space?

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• Breakout... Getting the ball reflection X angle when htitting paddle / bricks

  - by Steven Wilson

  Im currently creating a breakout clone for my first ever C# / XNA game. Currently Ive had little trouble creating the paddle object, ball object, and all the bricks. The issue im currently having is getting the ball to bounce off of the paddle and bricks correctly based off of where the ball touches the object. This is my forumala thus far: if (paddleLocation.Intersects(ballLocation)) { position.Y = paddleLocation.Y - texture.Height; motion.Y *= -1; // determine X motion.X = 1 - 2 * (ballLocation.X - paddleLocation.X) / (paddleLocation.Width / 2); } The problem is, the ball goes the opposite direction then its supposed to. When the ball hits the left side of the paddle, instead of bouncing back to the left, it bounces right, and vise versa. Does anyone know what the math equation is to fix this?

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• Pixel perfect collision with paths (Android)

  - by keysersoze

  Hi I'm writing a game and I'm trying to do some pixel perfect collisions with paths. The player's character has a bitmask which looks for example like this: Currenly my code that handles player's collision with path looks like this: private boolean isTerrainCollisionDetected() { if(collisionRegion.op(player.getBounds(), terrain.getBottomPathBounds(), Region.Op.INTERSECT) || collisionRegion.op(player.getBounds(), terrain.getTopPathBounds(), Region.Op.INTERSECT)) { collisionRegion.getBounds(collisionRect); for(int i = collisionRect.left; i < collisionRect.right; i++) { for(int j = collisionRect.top; j < collisionRect.bottom; j++) { if(player.getBitmask().getPixel(i - player.getX(), j - player.getY()) != Color.TRANSPARENT) { return true; } } } } return false; } The problem is that collisions aren't pixel perfect. It detects collisions in situations like this: The question is: what can I do to improve my collision detection?

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• Simulating Smartphones on PC with Unity

  - by Cengiz Frostclaw

  I want to make a game that depends on the phone orientation (changing shoot direction with tilt), however I need to test this on PC. So is there any tool I can use to simulate the orientation of the phone with mouse or keyboard of my PC? Something like joysticks on the screen. Thanks for any help! Edit : Thanks to @jhocking for his suggestion of Unity Remote. I, however still can accept a solution with using only PC, since I'm afraid of shortening my phone's battery life, for some reason.

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• Basic AI FSM - Handling state transition

  - by Galvanize

  I'm starting to study on how to implement game AI, and it seems to me that a very simple FSM for my Pong demo would be a nice way to start. My vision on implementing this would be to have a basic state interface and a class for each state, then the NPC would have an instance of the current state. The class should have an update method and directions on wich state to go next, depending on the event received. The question is: How do I handle this event? Should I have a regular addEventListener and a costum event system? Or should I check on update for the things that could change the current state? I'm feeling a bit lost, I feel I have a good grasp on the FSM concept but a good implementation seems tricky, thanks in advance.

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• Android frame by frame PNG animation

  - by Trick

  I am new at Android game development. I have done some apps before, but none of them are games :) So, I wanted to do a frame-by-frame animation of PNGs. I tried with AnimationDrawable, but OutOfMemory error comes quickly (I have a lot of PNGs). So I came upon SurfaceView. But I am stuck, because I really don't find any useful tutoirals/examples. What is the best way to make an animation like this? Here there already is a great answer to almost the same question, but all the links there don't work anymore. I would really like to here suggestions how to make an animation frame-by-frame with PNGs in Android and if you have any tutorials or examples, I will be really happy :)

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