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• What's the difference between Pygame's Sound and Music classes?

  - by Southpaw Hare

  What are the key differences between the Sound and Music classes in Pygame? What are the limitations of each? In what situation would one use one or the other? Is there a benefit to using them in an unintuitive way such as using Sound objects to play music files or visa-versa? Are there specifically issues with channel limitations, and do one or both have the potential to be dropped from their channel unreliably? What are the risks of playing music as a Sound?

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• How do I find a unit vector of another in Java?

  - by Shijima

  I'm writing a Java formula based on this tutorial: 2-D elastic collisions without Trigonometry. I am in the section "Elastic Collisions in 2 Dimensions". Part of step 1 says: Next, find the unit vector of n, which we will call un. This is done by dividing by the magnitude of n. My below code represents the normal vector of 2 objects (I'm using a simple array to represent the normal vector). int[] normal = new int[2]; normal[0] = ball2.x - ball1.x; normal[1] = ball2.y - ball1.y; I am unsure what the tutorial means by dividing the magnitude of n to get the un. What is un? How can I calculate it with my Java array?

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• Shared pointers causing weird behaviour

  - by Setzer22

  I have the following code in SFML 2.1 Class ResourceManager: shared_ptr<Sprite> ResourceManager::getSprite(string name) { shared_ptr<Texture> texture(new Texture); if(!texture->loadFromFile(resPath+spritesPath+name)) throw new NotSuchFileException(); shared_ptr<Sprite> sprite(new Sprite(*texture)); return sprite; } Main method: (I'll omit most of the irrelevant code shared_ptr<Sprite> sprite = ResourceManager::getSprite("sprite.png"); ... while(renderWindow.isOpen()) renderWindow.draw(*sprite); Oddly enough this makes my sprite render completely white, but if I do this instead: shared_ptr<Sprite> ResourceManager::getSprite(string name) { Texture* texture = new Texture; // <------- From shared pointer to pointer if(!texture->loadFromFile(resPath+spritesPath+name)) throw new NotSuchFileException(); shared_ptr<Sprite> sprite(new Sprite(*texture)); return sprite; } It works perfectly. So what's happening here? I assumed the shared pointer would work just as a pointer. Could it be that it's getting deleted? My main method is keeping a reference to it so I don't really understand what's going on here :S EDIT: I'm perfectly aware deleting the sprite won't delete the texture and this is generating a memory leak I'd have to handle, that's why I'm trying to use smart pointers on the first place...

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• Is there any small linux distribution which comes with a complete C devleopment environment

  - by hits_lucky

  Hi, I have installed "Damn Small Linux" on my home computer for doing C development in unix. But the distribution doesn't by default come with the C development environment and I am facing some issues when trying to install the gcc. Is there any other small Linux distribution which by default has the required packages for the C development. And also I don't want additional software which takes up lot of space but still would like to have the graphical environment. Thanks

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• What is the primary use of Vertex Buffer Objects?

  - by sensae

  From what I've read, it seems VBOs are purely for performance. I'm working on a very rudimentary learning project in lwjgl and I'm just trying to figure out what more advanced features of the library I should be delving into, and what their use is. My understanding is that VBOs allow a person to keep vertexes in VRAM while they aren't currently being drawn in a scene. In my case, I'm just drawing quads and performance probably isn't a concern at all, but I'm trying to piece together what's happening under the hood. If I'm drawing quads directly, I'm drawing from the CPU memory, correct? Also, if I'm not doing any checks for visibility, does that mean I'm rendering absolutely everything in the "scene", regardless of whether its in view? Are VBOs a way to store objects and only render what's needed?

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• Multiple Kickstarter campaigns. Good? Bad? Ugly?

  - by BerickCook

  I've been toying with the idea of doing a Kickstarter for my game to help fund some good artists to replace the placeholder graphics I currently have. Just a small goal of $2k or so. Regardless of whether the campaign is successful this time, would it be considered a faux pas to do another, larger kickstarter once the game is looking better? Would the rewards need to be the same, or could I offer better rewards at lower donation levels for the first one as an "early adopter" bonus?

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• I need advice on creating 3D walk cycles in XNA

  - by Zetar

  I want to purchase a number of 3D models from TurboSquid and animate them in an XNA game. I wrote a lot of games from 1985-1999 and have recently become involved with XNA. Now I would like to port one of my old games to the XBOX. I do have a background in 3D animation; but that was years ago. What is the current method for animating a walk cycle with a 3D model and using it inside XNA? Is there a book, software or a tutorial that you can recommend? Thanks in advance and sorry for such a broad and currently naive question.

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• What kind of performance issues does multiple instances of the exact same object have on a game?

  - by lggmonclar

  I'm fairly new to programming, and I've pretty much learned all the things I know on the go, while working on projects. The problem is that there some things that I just don't know where to begin searching. My question is about performance, and how can multiple instances of the same object affect it -- Specifically, I'm talking about XNA's "GraphicsDevice" class. I have it instanced on four different parts of my game, and in three of those, the object has the exact same values for all the attributes. So, in that case, should I be using the same instance of GraphicsDevice, passing it as a parameter, even if I use it in different classes? I apologize if the question seems redundant, but like I said, I've taught myself most of what I know, so there are quite a few "holes" in my learning process.

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• C++ unmanaged inside winform

  - by Gosso

  First: I am using C# and C++ on windows 7. I have created a basic rendering engine in c++ with directx 10. It works good as a stand alone application. But, when I sending the Form.Handle of a WinForm I want to render inside to the engine it crashes during D3D10CreateDeviceAndSwapChain with the following error: HRESULT: 0x887a0001 (2289696769) Name: DXGI_ERROR_INVALID_CALL I get the handle from the winform during loading of the form. unsafe { void *ptr=m_view.Handle.ToPointer(); uint v = (uint)ptr; lhandle = v.ToString(); };

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• How to Use Text in Unity3d

  - by ZiG-ZaG

  How Can i Create Text in Unity3D? I Use "3D Text" But Its Always on Top Of Everything! Can You Suggest Anything? I creating a 2D Game So its not Necessarily a 3D Text.. Edit: Because I Building a 2D Game My Scene is Full of Planes in Front of Camera And I want My Text to be Over One of the Planes and when plane is moving My Text appears behind it. But When I Use "3D Text" Its Always In Front of Everything. Sorry for My Bad English...

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• C# 2d array value check [duplicate]

  - by TLFTN

  This question already has an answer here: 3-in-a-row or more logic 4 answers I've managed to create a 2d array, then made it fill up with random numbers, like this: int[,] grid = new int[5, 5] ; Random randomNumber = new Random(); var rowLength = grid.GetLength(0); var colLength = grid.GetLength(1); for (int row = 0; row < rowLength; row++) { for (int col = 0; col < colLength; col++){ grid[row, col] = randomNumber.Next(5); Console.Write(String.Format("{0}\t", grid[row, col]));} Console.WriteLine(); } This results in an array with random values. Example: 3 0 0 3 3 1 3 3 3 2 0 0 2 0 4 3 3 2 0 3 4 0 3 3 0 Notice those three 3s which are connected to each other(in the second row), now how would I check if there's a match like this?

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• OpenGL : Keeping alpha in a render buffer

  - by Cyan

  In my current task, i need to render a texture into a render buffer, in order to work on it (apply special filters) there. The result is then considered a "new texture", which is later displayed. This works fine, except when the texture contains some transparent/semi-transparent parts. My current guess it that, within the render buffer, the texture is "merged" with a kind of "grey background". In this case, it obviously impacts the R,G,B color components of transparent pixels. I've yet to find a way around this. Even manually assigning alpha after the rendering process doesn't save the day for semi-transparent pixels, which RGB are "tainted" by the grey background.

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• Can a high FPS negatively affect how a program runs?

  - by rphello101

  Yeah I know this is a broad question and will get down rated, I'm just hoping for some answer before it gets closed. Anyway, I'm using Slick 2D/Java to play around with graphics. I'm having some trouble with trying to move an image. The weird thing is, the code works just fine on my laptop, but the image sporadically moves to (0,0) and stops on my desktop. The only difference between the two is that it says the FPS is about 500 on my laptop and 6600 on my desktop. Can that affect it or does someone have any ideas for what to check on?

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• Team seeks collaboration for 2D action adventure RPG

  - by AlchemicTempest

  not entirely sure if it's appropriate to post this here, but I'll try: We are looking for all kinds of game dev interested people for our 2D sci-fi action adventure rpg "Quantum Nucleus" This is voluntary collaboration. We are seeking programmers(Java), artists, designers, audio people and writers So basically all kinds of people. Please watch our video, for further information: Video Link Thanks ! :D http://www.Alchemic-Tempest.com

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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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• What kind of math should I be expecting in advanced programming?

  - by I_Question_Things_Deeply

  And I don't mean just space shooters and such, because in non-3D environments it's obvious that not much beyond elementary math is needed to implement. Most of the programming in 2D games is mostly going to involve basic arithmetic, algorithms for enemy AI and dimensional worlds, rotation, and maybe some Algebra as well depending on how you want to design. But I ask because I'm not really gifted with math at all. I get frustrated and worn out just by doing Pre-Algebra, so Algebra 2 and Calculus would likely be futile for me. I guess I'm not so "right-brained" when it comes down to pure numbers and math formulas, but the bad part is that I'm no art-expert either. What do you people here suppose I should do? Go along avoiding as much of the extremely difficult maths I can't fathom, or try to ease into more complex math as I excel at programming?

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• How to pause and unpause the animation of a sprite?

  - by user1609578

  My game has a sprite representing a character. When the character picks up an item, the sprite should stop moving for a period of time. I use CCbezier to make the sprite move, like this: sprite->runaction(x) Now I want the sprite to stop its current action (moving) and later resume it. I can make the sprite stop by using: sprite->stopaction(x) but if I do that, I can't resume the movement. How can I do that?

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• Java - Finding distance between player and tile in array

  - by Corey

  What is the best way performance wise to do this? When I click a tile I want it to get the distance and if I am close enough I can interact with the tile. One way would be to find the tile by doing mouse / tile width when I click correct? But then how would I get that tiles position? I know how to find the distance I just don't know how to get a certain tiles position from the array when I click it

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• XNA - How do I change the texture of a 2D object?

  - by Adorjan

  I am on to make a table game, I successfully figured out how to make the arraw and to move the cursor on it (by tiles). Now I wanna find out how to make that if I hit the Enter key the tile's texture change to another. I tryed like this: if (input.KeyPressed(Keys.Enter)) { cell[X,Y].Cell_texture = tile_texture; } but it doesn't really work. Hope you can help. :) Thanks!

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• Saving files with libgdx

  - by Rudy_TM

  Writing my game in libgdx, i arrived at the point when i need to save the player stats and the info of the levels, but in libgdx its not allowed to write the file inside folder of the application, only external (in the sd) is allowed, well, the point is that i want that my new file cat be seen by anyone, or if they see it how can i pass it to a binary file, so no one can see it. I just want to hide the file :P

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• fast 3d point -> cuboid volume intersection test

  - by user1130477

  Im trying to test whether a point lies within a 3d volume defined by 8 points. I know I can use the plane equation to check that the signed distance is always -1 for all 6 sides, but does anyone know of a faster way or could point me to some code? Thanks EDIT: I should add that ideally the test would produce 3 linear interpolation parameters which would lie in the range 0..1 to indicate that the point is within the volume for each axis (since I will have to calculate these later if the point is found to be in the volume)

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• What's the best way to handle slopes for a platfomer game using Box2D

  - by songokuhd

  I would like to know if there is any known solution for handling the player's movement on slopes using Box2D engine. I tried to do it using a circle as the player. Everything was fine until I tried to walk on slopes, the main problem is that due to gravity, the circle does not stop on the slope. Please if somebody has tried this before I'll appreciate it. If you have a better solution without the physics engine would be fine for me too. Thank you.

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• Limiting the speed of a dragged sprite in Cocos2dx

  - by Frozsht

  I am trying to drag a row of sprites using ccTouchesMoved. By that I mean that there is a row of sprites (they are colored squares) lined up next to each other and if I grab one with a touch the rest follow it. However, if the sprite that is selected by touch moves too fast it creates a slight gap between it and the following sprites. How do I go about limiting the speed that I can drag the sprite with ccTouchesMoved? This is the only solution I could think of to my problem. If anyone has another suggestion to prevent this sprite gap from happening I would appreciate it.

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• (Canvas/JS) Getting strange results with moving the view and fillRect, not sure what the problem is

  - by AngerAlone

  I'm really new to JS and have been banging my head against this problem all day. Here's a jsfiddle: http://jsfiddle.net/4ShH4/1/ AND fullscreen: http://jsfiddle.net/4ShH4/1/embedded/result/ I'm getting this weird tearing/elongation of the drawn elements when I move the screen with WASD. I have no idea whats causing the problem. I've put comments on the fiddle to explain my code. Any help would be greatly appreciated.

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• C++ Parallel Asynchonous task

  - by Doodlemeat

  I am currently building a randomly generated terrain game where terrain is created automatically around the player. I am experiencing lag when the generated process is active, as I am running quite heavy tasks with post-processing and creating physics bodies. Then I came to mind using a parallel asynchronous task to do the post-processing for me. But I have no idea how I am going to do that. I have searched for C++ std::async but I believe that is not what I want. In the examples I found, a task returned something. I want the task to change objects in the main program. This is what I want: // Main program // Chunks that needs to be processed. // NOTE! These chunks are already generated, but need post-processing only! std::vector<Chunk*> unprocessedChunks; And then my task could look something like this, running like a loop constantly checking if there is chunks to process. // Asynced task if(unprocessedChunks.size() > 0) { processChunk(unprocessedChunks.pop()); } I know it's not far from easy as I wrote it, but it would be a huge help for me if you could push me at the right direction. In Java, I could type something like this: asynced_task = startAsyncTask(new PostProcessTask()); And that task would run until I do this: asynced_task.cancel();

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