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  • libgdx loading textures fails [duplicate]

    - by Chris
    This question already has an answer here: Why do I get this file loading exception when trying to draw sprites with libgdx? 4 answers I'm trying to load my texture with playerTex = new Texture(Gdx.files.internal("player.jpg")); player.jpg is located under my-gdx-game-android/assets/data/player.jpg I get an exception like this: Full Code: @Override public void create() { camera = new OrthographicCamera(); camera.setToOrtho(false, Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); batch = new SpriteBatch(); FileHandle file = Gdx.files.internal("player.jpg"); playerTex = new Texture(file); player = new Rectangle(); player.x = 800-20; player.y = 250; player.width = 20; player.height = 80; } @Override public void dispose() { // dispose of all the native resources playerTex.dispose(); batch.dispose(); } @Override public void render() { Gdx.gl.glClearColor(1, 1, 1, 1); Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); camera.update(); batch.setProjectionMatrix(camera.combined); batch.begin(); batch.draw(playerTex, player.x, player.y); batch.end(); if(Gdx.input.isKeyPressed(Keys.DOWN)) player.y -= 50 * Gdx.graphics.getDeltaTime(); if(Gdx.input.isKeyPressed(Keys.UP)) player.y += 50 * Gdx.graphics.getDeltaTime(); }

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  • NPOT texture and video memory usage

    - by Eonil
    I read in this QA that NPOT will take memory as much as next POT sized texture. It means it doesn't give any benefit than POT texture with proper management. (maybe even worse because NPOT should be slower!) Is this true? Does NPOT texture take and waste same memory like POT texture? I am considering NPOT texture for post-processing, so if it doesn't give memory space benefit, using of NPOT texture is meaningless to me. Maybe answer can be different for each platforms. I am targeting mobile devices. Such as iPhone or Androids. Does NPOT texture takes same amount of memory on mobile GPUs?

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  • Building (simple) stellar systems

    - by space borg
    hi I'm currently looking at how to simulate easily some stellar systems (meaning some central stars and then some planets with maybe satellites), in order to allow later some space based strategy game (hence with space ships moving around). This should all be based around time (so the state of each system differs through time) I'm quite struggling with the math behind this topic, like for example: - ellipse related math, - creating the path from planet A to B having time in mind (respective positions will change over time)... Do you know of any resources for that ? I wouldn't mind even buying books about it... thanks in advance best space borg side note: how to display all this stuff isn't a matter at this point in time, I'll simple plans for that (basically sticking to 2D and a "high level view" with no space ships/planets details, just markers)

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  • How can state changes be batched while adhering to opaque-front-to-back/alpha-blended-back-to-front?

    - by Sion Sheevok
    This is a question I've never been able to find the answer to. Batching objects with similar states is a major performance gain when rendering many objects. However, I've been learned various rules when drawing objects in the game world. Draw all opaque objects, front-to-back. Draw all alpha-blended objects, back-to-front. Some of the major parameters to batch by, as I understand it, are textures, vertex buffers, and index buffers. It seems that, as long as you are adhering to the above two rules, there's little to be done in regards to batching. I see one possibility to batch, while still adhering to the above two rules. Opaque objects can still be drawn out of depth-order, because drawing them front-to-back is merely a fillrate optimization, meanwhile state changes may very well be far more expensive than the overdraw of drawing out of depth-order. However, non-opaque objects, those that require alpha-blending at least, must be drawn back-to-front in order to avoid rendering artifacts. Is the loss of the fillrate optimization for opaques worth the state batching optimization?

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  • Managing many draw calls for dynamic objects

    - by codetiger
    We are developing a game (cross-platform) using Irrlicht. The game has many (around 200 - 500) dynamic objects flying around during the game. Most of these objects are static mesh and build from 20 - 50 unique Meshes. We created seperate scenenodes for each object and referring its mesh instance. But the output was very much unexpected. Menu screen: (150 tris - Just to show you the full speed rendering performance of 2 test computers) a) NVidia Quadro FX 3800 with 1GB: 1600 FPS DirectX and 2600 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 260 FPS in OpenGL Now inside the game in a test level: (160 dynamic objects counting around 10K tris): a) NVidia Quadro FX 3800 with 1GB: 45 FPS DirectX and 50 FPS on OpenGL b) Mac Mini with Geforce 9400M 256mb: 45 FPS in OpenGL Obviously we don't have the option of mesh batch rendering as most of the objects are dynamic. And the one big static terrain is already in single mesh buffer. To add more information, we use one 2048 png for texture for most of the dynamic objects. And our collision detection hardly and other calculations hardly make any impact on FPS. So we understood its the draw calls we make that eats up all FPS. Is there a way we can optimize the rendering, or are we missing something?

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  • Developing an AI opponent for Monopoly

    - by Bernhard Zürn
    i want to develop an AI opponent for the Board Game Monopoly. I want to implement the whole Game with Prolog (XPCE). The probability for a field on the Board being hit, can be computed with Markov Chains. I already know some "best practices" like "after 50% of the playing time it does not make sense to buy out of jail because in jail you get renting fees for your fields but you don't have to pay for other fields as long as you stay in prison". The interesting question always is: buy a streetfield ? buy houses / hotels ? how much ? so i think i would have to compute some kind of future liquidity .. does anyone know how to pack that into an algorithm or how to translate it to prolog ?

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  • XNA - Obtaining depth from the scene's render target?

    - by user1423893
    I'm currently rendering my scene to a render target so it can be used for rendering methods such as post processing and order independent transparency. rtScene = new RenderTarget2D( GraphicsDevice, GraphicsDevice.PresentationParameters.BackBufferWidth, GraphicsDevice.PresentationParameters.BackBufferHeight, false, SurfaceFormat.Rgba64, DepthFormat.Depth24Stencil8, // Requires a depth format for objects to be drawn correctly (e.g. wireframe model surrounding model) 0, RenderTargetUsage.PreserveContents ); I am required to use RenderTargetUsage.PreserveContents so that the same render target can be rendered to multiple times, once for each of the draw methods below. DrawBackground DrawDeferred DrawForward DrawTransparent The problem is that DrawTransparent requires a copy of the scene's depth as a texture. Is there any way to obtain this from the scene render target above (rtScene)? I can't have more than one render target with RenderTargetUsage.PreserveContents as this causes problems on hardware such as the XBOX 360, so rendering the depth to a separate render target at the same time as I render the scene isn't possible as far as I can tell. Would I be able to get around this problem by "Ping-Ponging" two render targets (using the more compatible RenderTargetUsage.DiscardContents) and using the result for the depth texture?

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  • Model a chain with different elements in Unity 3D

    - by Alex
    I have to model, in unity 3D, a chain that is composed of various elements. some flexible, some rigid. The idea is to realize a human-chain where each person is linked to the other by their hands. I've not tried to implement it yet as i've no idea on what could be a good way to do it. In the game i've to manage a lot of chains of people... maybe also 100 chains composed of 11-15 people. The chain will be pretty simple and there won't be much interaction... Probabily some animation of the people one at time for each chain and some physic reaction (for example pushing a people in a chain should slightle flex the chain) the very problem of this work is that in the chain each object is composed by flexible parts (arms) and rigid parts (the body) and that the connection should remain firm... just like when people handshake... hands are firm and are the wrists to move. i can use C4D to model the meshes. i know this number may cause performance problems, but it's also true i will use low-poly versions of human. (for the real it won't be human, but very simple toonish characters that have harms and legs). So actually i'm trying to find a way to manage this in a way it can work, the performance will be a later problem that i can solve. If there is not a fast 'best-practiced' solution and you have any link/guide/doc that could help me in finding a way to realize this is, it would be very appreciated anyway if you post it. thanks

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  • Long running calculation on background thread

    - by SundayMonday
    In my Cocos2D game for iOS I have a relatively long running calculation that happens at a fairly regular interval (every 1-2 seconds). I'd like to run the calculation on a background thread so the main thread can keep the animation smooth. The calculation is done on a grid. Average grid size is about 100x100 where each cell stores an integer. Should I copy this grid when I pass it to the background thread? Or can I pass a reference and just make sure I don't write to the grid from the main thread before the background thread is done? Copying seems a bit wasteful but passing a reference seems risky. So I thought I'd ask.

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  • read object from compressed file that generate from actionscript3

    - by Last Chance
    I have made a simple game Map Editor, and I want to save a array that contain map tile info to a file, as below: var arr:Array = [.....2d tile info in it...]; var ba:ByteArray = new ByteArray(); ba.writeObject(arr); ba.compress(); var file:File = new File(); file.save(ba); now I had successful save a compressed object to a file. now the problem is my server side need to read this file and decompress get the arr out from file, then convert it as python list. is that prossible?

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  • Is it possible to give an animated GIF a transparent background?

    - by Phil
    I'm making a Fire Emblem-esque game. There are very cute 2D frames I made for each character, and, like a game like Fire Emblem, I want these characters to animate constantly. To circumvent the graphics programming involved I came up with a novel idea! I would make each character an animated gif, and only in special conditions ever halt their constant movement - in that case just change what image is being displayed. Simple enough. But I have a dilemma - I want the background of my .gifs to be transparent (so that the "grass" behind each character naturally shows, as per the screenshot - which has them as still images with transparent backgrounds). I know how to make a background transparent in numerous tools (GIMP, Photoshop). But it seems every .gif creator replaces the transparent background with something and I can't edit it back to transparent. Is it possible to have a .gif with a transparent "background"? Perhaps my knowledge of file formats is limiting me here.

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  • how to use string::find to look for a word rather each character seperately

    - by RubyKing
    Hello how would I look through a string for a word rather then each character in that word. I have my code here and it always seems to find everything that is .obj even if its o or b or j or "." is there anyway to get passed this here is my code? I checked the docuementation here link but nothing returned any results I craved so hard string &str = *it; if(it->find(".obj")) { cout << "Found .Obj" << endl; } I also tried to use string::compare but that failed :(

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  • How can I make a collection of mini-games in XNA where the user can download packs of minigames and the main .exe can run them without being altered?

    - by Pyroka
    I'm currently making a PC game in XNA. It's actually a collection of mini-games (there's 3 mini-games at the moment) however I plan to make and add more, in downloadable 'packs'. My question is, what's the best way to achieve this? Currently my thoughts are: Create a 'game' interface Build games to this interface but create them as .dlls Have the main .exe file scan a directory and load in the .dlls at runtime. I've not messed around with the idea much, but I know there are applications at-least that use this plug-in approach (Notepad++ seems to), but I'm not sure of any games that do (although I'm sure they must exist). However it seems that this is a problem that has been solved previously, so I'm wondering if there's any form of established best-practice.

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  • How do I detect if sprite should be going up or down?

    - by Geore Shg
    I use the following code to detect if a sprite should be going up or down: If (pos.Y + 100) >= Sprite.BottomY Then Going_up = True pos.Y = Sprite.BottomY - 130 End If If pos.Y <= Sprite.TopY Then Going_up = False pos.Y = Sprite.TopY - 1 Vel.Y = 3 End If Then my response code: If Going_up Then Vel.Y -= CSng(gameTime.ElapsedGameTime.TotalMilliseconds / 40) pos.Y -= Vel.Y Else Vel.Y += CSng(gameTime.ElapsedGameTime.TotalMilliseconds / 40) pos.Y += Vel.Y End If Sprite.velocity = Vel Sprite.position = pos But it's pretty terrible. It only works when the sprite starts at the top, and when I want to change the BottomY and TopY, it just starts glitching. What is a better to detect if the sprite should be going up or down?

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  • HTML5 Canvas A* Star Path finding

    - by Veyha
    I am trying to learn A* Star Path finding. Library I am using this - https://github.com/qiao/PathFinding.js But I am don't understand one thing how to do. I am need find path from player.x/player.y (player.x and player.y is both 0) to 10/10 This code return array of where I am need to move - var path = finder.findPath(player.x, player.y, 10, 10, grid); I am get array where I am need to move, but how to apply this array to my player.x and player.y? Array structure like - 0: 0 1: 0 length: 2, 0: 1 1: 0 length: 2, ... I am very sorry for my bad English language. Thanks.

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  • C++ Framework for iOS [closed]

    - by myrkos
    I am looking for a simple and easy C++ framework for iOS. Specifically, what I want it to wrap in a C++ API: Simple GUI system 2D Graphics User touch input and accelerometer Networking (UDP sockets) What I'm trying to do is port a multiplayer game to the iOS. I've seen cocos2d-x, but I don't know how stable it is and I don't think it supports networking. Oh, and I want it to be free and open source if possible. Android support is a plus but definitely not required.

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  • 3D RTS pathfinding

    - by xcrypt
    I understand the A* algorithm, but I have some trouble doing it in 3D to suit the needs of my RTS Basically, in the game I'm making, there will be agents with different sizes of OBB collision boxes. I can use steering behaviours for avoiding other agents, so I don't need complete dynamic pathfinding. However, there is a problem because different agents have different collision geometry, and structures can be placed in almost any place. This means that there might be a gap between two structures where some agents can go through and some can't. A solution I have found to this problem is to do a sweep of the collision geometry of the agent from start node of the edge the pf algorithm is currently testing, to the end node of that edge. But this is probably a bit overkill since every edge the algorithm tests would also have to create and test with a collision geometry sweep. What are some reasonable approaches to this problem? I should mention that I'd prefer not to use navmeshes, I prefer waypoints because my entire system is based on it atm.

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  • Unity: Render 2D textures on a 3D object's face

    - by www.Sillitoy.com
    I am not familiar with 3D graphics and I'd like to know what is the right way to render some 2D figures on different points of a wider face of a 3D object. My 3D object is just a cube representing a poker table. I have 2D png for players placeholders and I'd like to render these figures on the 3D object where needed. An alternative solution would be to render the whole face with a big picture containing all the placeholders figures. However it would be a waste of memory and thus less efficient. What do you suggest me?

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  • Learning C++ but wanting to develop iOS Apps

    - by DiscreteGenius
    I'm a computer engineering student and taking my second programming class. I'm learning C++ using "C++ Primer Plus" 5th edition by Prata. I want to develop for iOS. I understand the main language for Xcode is Objective-C. Am I hurting myself by learning C++ before any other language (notably before my desired lang Objective-C)? There's got to be a reason the university requires C++ to learn as a basis language. Please offer any helpful guidance or how I should go about this. Thanks//

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  • Creating meaningful and engaging quests

    - by user384918
    Kill X number of monsters. Gather Y number of items (usually by killing X number of monsters). Deliver this NPC's package to this other NPC who is far far away. etc. Yeah. These quests are easy to implement, easy to complete, but also very boring after the first few times. It's kind of disingenuous to call them quests really; they're more like chores or errands. What ideas for quests have people seen that were well designed, immersive, and rewarding? What specific things did the developers do that made it so? What are some ideas you would use (or have used) to make quests more interesting?

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  • C++ Directx 11 D3DXVECTOR3 doesn't allow me to devide it

    - by Miguel P
    If i have a simple vector3 like this: D3DXVECTOR3 inversevector = D3DXVECTOR3( (pos+lookat_pos)); It works perfect! But let's say i wanted to multiply it by: Speed*(float) timeHandler.GetDelta() So: D3DXVECTOR3 inversevector = D3DXVECTOR3( (pos+lookat_pos) * Speed*(float) timeHandler.GetDelta()); Now this fails completely, i've used this snippet before, but for some wierd reason it simply won't work( The vector somehow leads x,y,z to 0 or almost, no idea why). Do you have any idea why?

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  • Problem with SAT collision detection overlap checking code

    - by handyface
    I'm trying to implement a script that detects whether two rotated rectangles collide for my game, using SAT (Separating Axis Theorem). I used the method explained in the following article for my implementation in Google Dart. 2D Rotated Rectangle Collision I tried to implement this code into my game. Basically from what I understood was that I have two rectangles, these two rectangles can produce four axis (two per rectangle) by subtracting adjacent corner coordinates. Then all the corners from both rectangles need to be projected onto each axis, then multiplying the coordinates of the projection by the axis coordinates (point.x*axis.x+point.y*axis.y) to make a scalar value and checking whether the range of both the rectangle's projections overlap. When all the axis have overlapping projections, there's a collision. First of all, I'm wondering whether my comprehension about this algorithm is correct. If so I'd like to get some pointers in where my implementation (written in Dart, which is very readable for people comfortable with C-syntax) goes wrong. Thanks! EDIT: The question has been solved. For those interested in the working implementation: Click here

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  • Converting a WIndows Store App to Android

    - by pm_2
    I cross posted this from SO I'm very new to Xamarin. I have a few published Windows Store apps and want to convert them to Android. I'm attempting to use Xamarin for this. I'm just using the free version of Xamarin. Here's where I am so far: I am trying two apps - one was build with Monogame and one is just build on the WinRT framework. I have managed to get them both into Xamarin studio, basically by hacking the csproj files. I'm getting build errors because it's missing references. There does appear to be some equivalent Mono / .Net4 libraries, but things like Microsoft.Xna.Framework seem to be missing. So, my question is: am I going about this the right way and, if so, am I missing a step ("convert dependencies" or something)? If I'm not going about this the right way then how should I be doing this (I found very few online resources on this subject)?

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  • Does Windows 8 still support DirectX 9?

    - by SullY
    Is Windows 8 supporting DirectX 9? Because I was looking through some samples written in C++ and DirectX 9 made for Windows 8. It wasn't that, like I know it ( look here http://directxtutorial.com/Lesson.aspx?lessonid=111-4-2 ). E.g. Inizialising DirectX with COM: ComPtr<ID3D11Device1> dev; ComPtr<ID3D11DeviceContext1> devcon; It's just weird because I know it with the old way: ID3D11Device *dev; ID3D11DeviceContext *devcon; ( I hope you understand what I want to tell ) I hope it hasn't change completely due the released their new OS.

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  • Drawing flaming letters in 3d on OpenGL ES 2.0

    - by Chiquis
    I am a bit confused about how to achieve this. What i want is to "draw with flames". I have achieved this with textures successfully, but now my concern is about doing this with particles to achieve the flaming effect. Am I supposed to have a Path in where i should add many particle emitters along the path that will "be emitting flames"? I understand the concept for 2d, but for 3d are the particles (that are quads) always supposed to be facing the user? Edit: Something else im worried about is the performance hit that will occur by having that many particle emitters, because there can be many letters and drawings at the same time. And each of these elements will have many particle emitters.

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