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• Transition Player Position

  - by Lycrios

  I'm currently working on a java MMO with a pretty solid start, but I've come across an issue I need a little help with. I'm working on player position's. Meaning there X/Y on the screen, if the PlayerA has a higher FPS(Frames Per Second) then other players, the resulting action will be that PlayerA will move faster than everyone else. I know the reasoning for this, it's because when the game draws I just use: x++; What would a better method be?

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• Is this a reliable method of parsing glGetShaderInfoLog()?

  - by m4ttbush

  I want to get a list of errors and their line numbers so I can display the error information differently from how it's formatted in the error string and also to show the line in the output. It looks easy enough to just parse the result of glGetShaderInfoLog(), look for ERROR:, then read the next number up to :, and then the next, and finally the error description up to the next newline. However, the OpenGL docs say: Application developers should not expect different OpenGL implementations to produce identical information logs. This makes me worry that my code may behave incorrectly on different systems. I don't need them to be identical, I just need them to follow the same format. So is there a better way to get a list of errors with the line number separate, is it safe to assume that they'll always follow the "ERROR: 0:123:" format, or is there simply no reliable way to do this?

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• How to detect and collide two elastic line segments?

  - by Tautrimas

  There are 4 moving physical nodes in 3D space. They are paired with two elastic line segments / strings (1 <- 2; 3 <- 4). Part I: How to detect the collision of two segments? Part II: On the moment of collision, fifth node is created at the intersection point and here you have the force-based graph. 5-th node (bend point) can slide among the strings as in a real world. Given the new coordinates of 4 nodes, how to calculate the position of the 5-th node on the next frame? I assume string force on the nodes to be F = -k * x where x is the string length. All I came up to is that the force between 5 and 1 equals 5 and 2 (the same with 3 and 4). What are the other properties?.

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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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• How do I render from one render target to another?

  - by Chaotikmind

  I have two render targets: a fake backbuffer; a special render target where I do all my rendering. a light render target; where I render my light fx. I'm sure I'm rendering correctly on both. The problem arises when I overlay the light render target onto the fake backbuffer by drawing a quad covering it: DxEngine.DrawSprite(0.0f, 0.0f, 0.0f, (float)DxEngine.GetWidth(), (float)DxEngine.GetHeight(), 0xFFFFFFFF, LightSurface->GetTexture()); Regardless of what's in the light target, nothing is rendered onto the other target. I tried clearing the light target with full-white or full-black, but still get nothing. Fake backbuffer created with Direct3dDev->CreateTexture(Width, Height, 1, D3DUSAGE_RENDERTARGET, D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, &Texture, nullptr); Light render target created with Direct3dDev->CreateTexture(Width, Height, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &Texture, nullptr); I also tried to create both with D3DFMT_A8R8G8B8, again without difference. Both targets have the same width and height. Only the fixed pipeline is used DirectX setup for rendering : Direct3dDev->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR ); Direct3dDev->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR ); Direct3dDev->SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_NONE ); Direct3dDev->SetSamplerState(0, D3DSAMP_ADDRESSU, D3DTADDRESS_WRAP ); Direct3dDev->SetSamplerState(0, D3DSAMP_ADDRESSV, D3DTADDRESS_WRAP ); Direct3dDev->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE); Direct3dDev->SetRenderState(D3DRS_LIGHTING, false); Direct3dDev->SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE); Direct3dDev->SetRenderState(D3DRS_ZWRITEENABLE,D3DZB_TRUE); Direct3dDev->SetRenderState(D3DRS_ZFUNC,D3DCMP_LESSEQUAL); Direct3dDev->SetRenderState(D3DRS_ALPHABLENDENABLE, true ); Direct3dDev->SetRenderState(D3DRS_ALPHAREF, 0x00000000ul); Direct3dDev->SetRenderState(D3DRS_ALPHATESTENABLE, true); Direct3dDev->SetRenderState(D3DRS_ALPHAFUNC,D3DCMP_GREATER); Direct3dDev->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA ); Direct3dDev->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA ); Direct3dDev->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE); Direct3dDev->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE); Direct3dDev->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE); Direct3dDev->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE); Direct3dDev->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE); Direct3dDev->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE); Direct3dDev->SetTextureStageState(0, D3DTSS_RESULTARG, D3DTA_CURRENT); Direct3dDev->SetTextureStageState(0, D3DTSS_TEXCOORDINDEX, D3DTSS_TCI_PASSTHRU); //ensure the first stage is not used for now Direct3dDev->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_DISABLE); How can I do this right?

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• Looking for feedback on design pattern for simple 2D environment

  - by Le Mot Juiced

  I'm working in iOS. I am trying to make a very simple 2D environment where there are some basic shapes you can drag around with your finger. These shapes should interact in various ways when dropped on each other, or when single-tapped versus double-tapped, etc. I don't know the name for the design pattern I'm thinking of. Basically, you have a bunch of arrays named after attributes, such as "double-tappable" or "draggable" or "stackable". You assign these attributes to the shapes by putting the shapes in the arrays. So, if there's a double-tap event, the code gets the location of it, then iterates through the "double-tappable" array to see if any of its members are in that location. And so on: every interactive event causes a scan through the appropriate array or arrays. It seems like that should work, but I'm wondering if there's a better pattern for the purpose.

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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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• What precaution should I take to hire online freelancer designers? [on hold]

  - by tomDev

  For quite some time my company is super busy with our apps, and a few days ago someone contacted me by email offering his services to help me as a graphic designer. He has a fair price, a flickr portfolio (with great stuff but not popular at all), same on Twitter. I was really considering in hiring him for some specific service, but the question is... what precaution should I take when hiring someone I have no idea who is? I can't even be sure I have his real name and his real country. How do I make a contract? How do I pay? How do I know he will not sue us after the graphics reach the App Store asking for more money? And of course, how do I know he will actually do the service and not steal from some stock service? Am I a bit paranoiac or is this a common deal with graphics designers? PS: if someone asks I can provide his flickr, but I think this is a general question and not specific for this designer.

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• Inversion of control in Unity?

  - by user3206275

  I am semi-experienced .NET developer who has just began working with Unity. I am trying to decide on how to make IoC work in Unity 4.X ( I have not yet tested anything), and I wonder what are the good ways of achieving it. This post and its answers states that Ninject won't work with Unity, however it is old. Is it still true? If yes, what are other means of achieving IoC in Unity ? Edit 1 : I am targeting mainly Windows platform. So I don't need platform interoperability, I just need it to work.

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• How do I do a game loop in c99?

  - by linitbuff

  I'm having trouble with how to structure a game using c99. I've seen a few tutorials on making a game loop, but they are all done with c++ and classes. My main problem seems to be moving data around between the functions without creating a mess, and what stuff to put in what header files etc. Do I just do something similar to the c++ loops, and create a class-like header with a structure containing all items needed by more than one of the functions, along with the prototypes of said functions, and include the header in each function's header file? Then, in the main function, instantiate the structure and pass a pointer to it to every function in the loop? Is this ok, or is there a better way to do it, and are there any good 'c' specific tutorials available? Cheers

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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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• Basic Android game loop having issues

  - by WillDaBeast509

  I've set up a very basic game loop that should draw a circle, run 100 times, then draw another. I also have a text field that should display how many times the loop has ran. However, the screen seems to not update. It displays a different value for the tick count (different each time the app is ran) and simply stays there. After exiting the app, I get an error saying "Unfortunately, MyApp has stopped." Here is the relevant code: DrawView public class DrawView extends SurfaceView implements SurfaceHolder.Callback { Paint p = new Paint(); MainThread thread; private int y=0; public DrawView(Context c) { super(c); thread = new MainThread(this, getHolder()); thread.running = true; getHolder().addCallback(this); setFocusable(true); } public void draw(Canvas c) { if(c==null) return; //super.onDraw(c); c.drawColor(Color.WHITE); p.setColor(Color.RED); p.setTextSize(32); p.setTypeface(Typeface.SANS_SERIF); c.drawCircle(getWidth()/2-100,getHeight()/2, 50, p); c.drawText("y = " + y, 50, 50, p); if(y>=100) { Log.i("DRAW", "drawing circle"); c.drawCircle(getWidth()/2+100,getHeight()/2, 50, p); } else y++; Log.i("INFO", "y = " + y); } @Override public boolean onTouchEvent(MotionEvent event) { return true; } public void onDraw(Canvas c){} public void surfaceCreated(SurfaceHolder p1) { thread.start(); } public void surfaceChanged(SurfaceHolder p1, int p2, int p3, int p4) { // TODO: Implement this method } public void surfaceDestroyed(SurfaceHolder p1) { thread.running = false; boolean retry = true; while (retry) { try { thread.join(); retry = false; } catch (InterruptedException e) { Log.i("EX", "cathing exception"); } } } } MainThread public class MainThread extends Thread { private DrawView page; private SurfaceHolder holder; public boolean running; public MainThread(DrawView p, SurfaceHolder h) { super(); page = p; holder = h; } @Override public void run() { while(running) { Canvas c = holder.lockCanvas(); page.draw(c); holder.unlockCanvasAndPost(c); } } } Here is an example log outupt: http://pastebin.com/tM9dUPuk It counts the number of ticks correctly and should draw the second circle, but the screen looks like its not updating. After closing the app, the log continues to run and keep outputting "y = 100 drawing circle" until it crashes and shows the error report. What is going on and how can I fix these two problems?

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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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• 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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• How do you set the movement speed of a sprite?

  - by rphello101

  I'm using Slick 2D/Java to play around with graphics. Getting an image to move is easy: Input input = gc.getInput(); if(input.isKeyDown(sprite.up)){ sprite.y--; }else if (input.isKeyDown(sprite.down)){ sprite.y++; }else if (input.isKeyDown(sprite.left)){ sprite.x--; }else if (input.isKeyDown(sprite.right)){ sprite.x++; } However, this is called on every update, so if you hold up, the sprite moves to the edge of the screen in a few hundred milliseconds. Since coordinates are integers, I can't add less than 1 to slow the sprite down. I'm assuming I must have to implement a timer of some sort or something. Any advice?

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• Toggle Fullscreen at Runtime

  - by sharethis

  Using the library GLFW, I can create a fullscreen window using this line of code. glfwOpenWindow(Width, Height, 8, 8, 8, 8, 24, 0, GLFW_FULLSCREEN); The line for creating a standard window looks like this. glfwOpenWindow(Width, Height, 8, 8, 8, 8, 24, 0, GLFW_WINDOW); What I want to do is letting the user switch between standard window and fullscreen by a keypress, let's say F11. It there a common practice of toggling fullscreen mode? What do I have to consider?

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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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• Android - Unity3D: setVisibility(View.VISIBLE) crashes

  - by Kazoeja

  I have a unity project and I use a Android (java) plugin to get camera data. I draw this on a TextureView. I want to hide/show this view when I press a button in unity. But my app crashes when I setVisibility onCreate UnityPlayer.currentActivity.addContentView(texView, new FrameLayout.LayoutParams(400, 400)); java: public void HideVideo() { //Hide view _TextureView.setVisibility(View.INVISIBLE); } Is there an extra function I need to call, or may I only call it on certain times? None of these thins work, they all make my app crash. _TextureView.setVisibility(View.INVISIBLE); _TextureView.setActivated(false); _TextureView.setAlpha(0); _TextureView.setTranslationY(-1000);

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• Moving two objects proportionally

  - by SSL

  I'm trying to move two objects away from each other at a proportional distance, but on different scales. I'm not quite sure how to do this. Object A can go from position 0.1 to 1. Object B has no limits. If object B is decreasing, then Object A should be decreasing at rate R. Likewise, if Object B is increasing, then Object A increases at rate R. How can I tie these two Object positions together so that in an update loop, they automatically update their positions? I tried using: ObjA.Pos += 0.001f * ObjB.VelocityY; //0.001f is the rate This works but there's an error each time it runs. ObjA starts off at its max position 1 but then the next time it will stop at 0.97, 0.94, 0.91 etc.. This is due to the 0.001f rate I put in. Is there a way to control the rate, yet not end up with the rounding error?

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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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• How do audio based games such as Audiosurf and Beat Hazard work?

  - by The Communist Duck

  Note: I am not asking how to make a clone of one of these. I am asking about how they work. I'm sure everyone's seen the games where you use your own music files (or provided ones) and the games produce levels based on them, such as Audiosurf and Beat Hazard. Here is a video of Audiosurf in action, to show what I mean. If you provide a heavy metal song, you would get a completely different set of obstacles, enemies, and game experience from something like Vivaldi. What does interest me is how these games work. I do not know much about audio (well, data-side), but how do they process the song to understand when it is settling down or when it's speeding up? I guess they could just feed the pitch values (assuming those sorts of things exist in audio files) to form a level, but it wouldn't fully explain it. I'm either looking for an explanation, some links to articles about this sort of thing (I'm sure there's a term or terms for it), or even an open-source implementation of this kind of thing ;-) EDIT: After some searching and a little help, I found out about FFT (Fast Fourier Transform). This maybe a step in the right direction, but it is something that does not make any sense to me..or fits with my physics knowledge of waves.

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• 3D Mesh Collision Help

  - by BlackAfricano

  I am new to XNA (I have only been working in it for a countable number of weeks) as well as to these forums (I have only made 1-2 other posts), so this may seem like a strange request, but I am wondering if anybody knows about more advanced collision in XNA. So far I have only been able to figure out BoundingSphere's which seem to be the simplest of the methods, and I was thinking of looking more into BoundingBoxes because the game I have is a 2-3D platformer. The problem I realized was that if I wanted to get any more advanced than stages in the shape of a box, I would face some immediate dilemmas. I was hoping somebody here was knowledgeable on the subject and could inform me where I could get started learning how to do something like this: https://www.youtube.com/watch?v=ekMD_Gtt8d4 Although the game in this video isn't very pretty, the mesh collision looks like what I'm looking for. I am hoping for the most complete solution, if possible.

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• Farseer Physics Samples and Krypton how to reference game

  - by Krell

  I'm sure this is totally simple and yes I am new at this. I am trying to set up Krypton inside farseer. 1. create a new Krypton engine in my sub screen aka AdvancedDemo1 : PhysicsGameScreen, IDemoScreen Via this.krypton = new KryptonEngine(this, "KryptonEffect"); The problem is the KryptonEngine(this wants reference to Game game, I cant seem to reference it from FarseerPhysicsGame : Game So how would I do that? or 2. I can put it directly in FarsserPhysicsGame but again I cant seem to figure out how to reference FarseerPhysicsGame in AdvancedDemo1. or 3. I can put it inside the public FarseerPhysicsGame() and do Componenets.Add(krypton) [which works] HOWEVER I cant figure out how to reference the compoenet once it is added. You should be able to stop reading here , but for more detail I simply took the Farseer XNA Samples went into FarseerPhysicsGame.cs and deleted all the screens and menus except AdvancedDemo1 so there is one option and I just click that to load into the advancedDemo1 and thats where I want to put the lights from krypton. Thanks. Edit: Figured out 1 solution though I am still curious about others. Solution 1 I was able to use ScreenManager.Game(not sure why it was there but Ill try to figure it out later)

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• Knockback enemy based off of direction sprite is facing

  - by pengume

  Hey Everyone, Today I am trying to make it so if I hit the enemy then the enemy well be knocked backwards in the direction the sprite is facing. I am rotating the sprite around 360 degrees using a joystick on the screen and wanted to know the best practice or ways to accomplish this. I have come up with a few ideas but none of them make use of the sprites angle he is facing just a check to see if I hit the bottom then move him upward and so forth. I am just stumped on how to apply the sprites angle to the enemies x and y coordinate and move him accordingly. Has anyone tried this and have suggestions or things to look for? Thanks in advance.

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• Base on User Drawing Create Polygon Body as well Image

  - by Siddharth

  In my game, I want to provide a user with drawing feature. By free hand drawing user create a polygon shape. So in my game implementation I have to create body for all found vertices and I have to generate image based on that polygon shape. So my problem is how to create image that match the user provided vertices. In cocos2d I listen that there is an implementation of something like Image Masking. But I don't understand how that thing I implement in andengnine. Please provide any guidance on how to create image same as user generated polygon shape.

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