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• 2D Ragdoll - should it collide with itself?

  - by Axarydax

  Hi, I'm working on a ragdoll fighting game as a hobby project, but I have one dilemma. I am not sure if my ragdoll should collide with itself or not, i.e. if ragdoll's body parts should collide. 2D world is somewhat different than 3D, because there are several layers of stuff implied (for example in Super Mario you jump through a platform above you while going up). The setup I'm currently most satisfied with is when only the parts which are joined by a joint don't collide, so head doesn't collide with neck, neck with chest, chest with upper arm etc, but the head can collide with chest, arms, legs. I've tried every different way, but I'm not content with either. Which way would recommend me to go?

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• Bouncing ball isssue

  - by user

  I am currently working on the 2D Bouncing ball physics that bounces the ball up and down. The physics behaviour works fine but at the end the velocity keep +3 then 0 non-stop even the ball has stopped bouncing. How should I modify the code to fix this issue? ballPos = D3DXVECTOR2( 50, 100 ); velocity = 0; accelaration = 3.0f; isBallUp = false; void GameClass::Update() { velocity += accelaration; ballPos.y += velocity; if ( ballPos.y >= 590 ) isBallUp = true; else isBallUp = false; if ( isBallUp ) { ballPos.y = 590; velocity *= -1; } // Graphics Rendering m_Graphics.BeginFrame(); ComposeFrame(); m_Graphics.EndFrame(); }

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• Units in tile world

  - by Vilzow

  I've started to make a 2D sidescroller, the camera and world rendering works as I expect, but now comes the physics part of world. What I need is that one tile in x direction (or y direction) should correspond to 1 meter. Since I have a variable time step (android mobile game), I can't figure it out, since the timing and velocity always will be dependent of the device. So, is there any good way to make one tile to correspond 1 meter? This would be good, otherwise the physics implementation would later be weird.

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• Ubuntu - Psychonauts - Camera involentarily listing to the right

  - by James

  I've recently purchased the Humble Bundle V and have been having an absolute riot with the games given. The one problem I'm running into though, is that whenever I launch Psychonauts and run a game, the Camera lists to the right slowly and I can't get it to stop. Strangely enough when I zoom in (with z), it lists to the left. I was wondering if anyone else had this problem and if there was a solution. Maybe it's even the mouse configs I currently have on the laptop that interacts strangely with 3D environments.

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• Is Adobe Flash 11.2 working with Nvidia hardware again in 12.04?

  - by Oranges

  I installed the newest Nvidia-Linux drivers version number 304.43 on 12.04 installation and all Flash Videos now show me "accelerated video rendering". Previous Nvidia drivers + Adobe Flash only rendered in software, at least since Adobe officially said they turned off "hardware acceleration" for Linux, because of unstable and unsecure drivers. Has this changed? Is hardware acceleration really back? Can anyone verify this as well? The Nvidia driver 304.43 patch notes said: Fixed a bug that caused VDPAU to hang when expanding the YouTube Flash Player. Hardware: Nvidia 8600M GT

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• krunner unreadable black text on black background. File a bug? Where?

  - by user52784

  I'm running Kubuntu 12.04 beta2 (up to date). Already tried to create a user from the scratch but the problem can still be replicated. I'll make it simple: with any of the available themes (air, air 4 netbooks, oxygen) whenever I disable desktop effects, KRunner instantly becomes black (with black fonts) rendering itself useless because of its unreadable text. Here is a screenshot I took: http://i42.tinypic.com/348sz7n.jpg The weird thing is that with effects enabled KRunner is "light gray" and perfectly functional. What can I do? Should I file a bug? If yes: where? On the KDE bug tracker or the Kubuntu one? Thanks in advance!

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• Les CPU monocoeur des smartphones et tablettes sont-ils assez puissants ? NVIDIA souhaite mettre plus de coeurs dans ces appareils

  Les CPU monocoeur des smartphones et tablettes sont-ils assez puissants ? Non répond Nvidia, qui souhaite implémenter plus de coeurs dans ces appareils Pour Nvidia, "les processeurs dual-core seront le standard en 2011, et les quad-core ne tarderont pas à suivre". L'entreprise trouve en effet que les appareil mobiles, actuellement équipés de puces à un seul coeur, ne sont pas assez puissants. Pourtant, on leur en demande toujours plus, notamment de nos jours avec l'arrivée des jeux en 3D ; qui sont plutôt gourmands. Face à cela, Nvidia propose d'ajouter des coeurs supplémentaires dans les circuits de ces machines. Les bénéfices ? Une durée de vie des batteries allongée, et l'e...

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• Animations not accepted in animator

  - by Lautaro

  In the official Unity Animator State Machine tutorial video animation clips are dragged out from the assets folder into the animator and dropped. I have a 3D model that i bought online to experiment with that comes with animations. I added a custom made animation as well. These all work well in my demo project. But when i add a animator to the assets and try to drag and drop animations onto it it doesnt work. I get a forbidden-sign as a mouse pointer. I try to add animations through the inspector but that does not work either. The tutorials makes it seem so easy and does not talk anything about what animations can be used. What am i doing wrong?

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• Good resources for learning about graphics hardware

  - by Ken

  I'm looking for some good learning resources for graphics hardware (and associated low level software). Basically I want to learn more about what goes on underneath the opengl/direcx API layers in terms of how things are implemented. I familiar with what happens in principle during the various stages of the rendering pipeline (viewing, projection, clipping, rasterization etc). My goal is to be able to make better and more informed decisions about tradeoffs and potential optimisations when graphics/shader programming with respect to the following kinds of issues; batching view culling occlusions draw order avoiding state changes triangles vs pointsprites texture sampling etc Basically whatever the graphics programmer needs to know about modern graphics hardware in order to become more effective. I'm not really looking for specific optimisation techniques, rather I need more general knowledge so that I will naturally write more efficient code.

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• What animation technique is used in 'Dont Starve'?

  - by Bugster

  While playing a few games in my personal time off development I've stumbled across a survival 2D/3D survival game. The game was apparently made in SDL and GLUT (Dont starve) but what really amazed me was the animations in the game. The animations are extremely smooth and fluent. There is no distortion while animating, what usually happens in hand-made animations is that pixels get removed, animations are jaggy and they simply aren't as smooth. That got me thinking on how they managed to accomplish such a quality of animations. Were they really handmade (If they were, then it must've taken a very talented artist), is it bone animation or are they using another technique?

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• How does a collison engine work?

  - by JXPheonix

  Original question: Click me How exactly does a collision engine work? This is an extremely broad question. What code keeps things bouncing against each other, what code makes the player walk into a wall instead of walk through the wall? How does the code constantly refresh the players position and objects position to keep gravity and collision working as it should? If you don't know what a collision engine is, basically it's generally used in platformer games to make the player acutally hit walls and the like. There's the 2d type and the 3d type, but they all accomplish the same thing: collision. So, what keeps a collision engine ticking?

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• Move Camera Freely Around Object While Looking at It

  - by Alex_Hyzer_Kenoyer

  I've got a 3D model loaded (a planet) and I have a camera that I want to allow the user to move freely around it. I have no problem getting the camera to orbit the planet around either the x or y axis. My problem is when I try to move the camera on a different axis I have no idea how to go about doing it. I am using OpenGL on Android with the libGDX library. I want the camera to orbit the planet in the direction that the user swipes their finger on the screen.

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• Can various browsers be assumed to maintain predictible state accurately in multiplayer online gaming?

  - by Nikos

  With many games it is said that server will assume that clients keep track of the world accurately. Assuming this is true, for a browser based multiplier space invaders game you would only tell the client when new bullets or the players ship moves and everything that behaves in a predetermined manner in the js client. It would be expected that positions would be the same in the browsers. Do you think you could trust browsers to do this? I feel that timings could differ between rendering loops and cause positions to get out of sync and might just get the server to maintain all the positions to make sure.

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• unit testing on ARM

  - by NomadAlien

  We are developing application level code that runs on an ARM processor. The BSP (low level code) is being delivered by a 3d party so our code sits just on top of this abstraction layer (code is written in c++). To do unit testing, I assume we will have to mock/stub out the BSP library(essentially abstracting out the HW), but what I'm not sure of is if I write/run the unit test on my pc, do I compile it with for example GCC? Normally we use Realview compiler to compile our code for the ARM. Can I assume that if I compile and run the code with x86 compiler and the unit tests pass that it will also pass when compiled with RealView compiler? I'm not sure how much difference the compiler makes and if you can trust that if the x86 compiled code pass the unit tests that you can also be confident that the Realview compiled code is ok.

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• xrandr shows VGA1 as disconnected

  - by Felix

  I have a Thinkpad W520 with Nvidia Optimus graphics. I have disabled the Nvidia card in BIOS (by selecting "integrated graphics"), so I'm running only on the integrated Intel graphics. I get full 3D acceleration, which would suggest the drivers are properly installed. However, I'm not able to use an external monitor. With the external monitor connected and turned on, running xrandr always gives: $ xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1920x1080 60.0*+ 59.9 50.0 1680x1050 60.0 59.9 1600x1024 60.2 1400x1050 60.0 1280x1024 60.0 1440x900 59.9 1280x960 60.0 1360x768 59.8 60.0 1152x864 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) What gives? It sees the VGA1 port (to which the external display is connected), but it appears disconnected. I have tried forcing a resolution as per these instructions, but when I do that X becomes unresponsive and I have to Ctrl-Alt-F1 and restart it.

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• Mobile My Oracle Support 6.3 Release is live!

  - by JanSyss

  We have released Mobile My Oracle Support 6.3 last Saturday (13-Oct-2012), including 10 enhancements and almost 40 bug fixes. Mobile My Oracle Support is My Oracle Support's webapplication optimized for mobile devices to manage your Service Requests, your On Demand Requests for Change (RFCs), search over Support's Knowledge Base, Bug database or Sun System Handbook, and to manage your pending user requests (CUA). You can find the application at http://support.oracle.mobi  or get redirected from http://support.oracle.com when using a mobile device. Overall Several UI optimizations in different screens. Service Request Area Show the platinum icon for Platinum SRs and the restore status for Platinum Sev 1s. Email send with Share functionality now contains links to Mobile MOS and Full Site. Knowledge Management Area Ability in Advanced Search to search the Sun System Handbook (cfr. screenshot below) Better rendering of the KB documents to avoid where possible horizontal scrolling. Don't hesitate to share your feedback and comments or even requests.

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• System hangs at glReadPixel call with GL_TEXTURE_2D_ARRAY for texturing

  - by Roshan

  I am calling glReadPixel after glDrawArray call. I am rendering a geometry with 3D texture on it as a target GL_TEXTURE_2D_ARRAY. My systems hangs at glreadpixel call. When i use target as GL_TEXTURE_3D the issue does not occurs and it correctly reads the framebuffer contents. glReadPixels(0, 0, GetViewportWidth(), GetViewportHeight(), GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)rendered_pixels); I am using SNORM textures with GL_byte data in glTeximage3D call and I am not calling glPixelStorei, is it because of this? What should be the parameter for pixelstore call?

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• How would I go about implementing a globe-like "ballish" map?

  - by rFactor

  I am new to 3D development and I have this idea of having the game world like our globe is - a ball. So, there would be no corners in the map and the game is top-down RTS game. I would like the camera to go on and on and never stop even though you are moving the camera to the same direction all the time. I am not sure if this is even possible, but I would really like to build a globe-like map without borders. Can this be done, and how exactly? I am using XNA, C#, and DirectX. Any tutorials or links or help is greatly appreciated!

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• How do you start modding a game without an editor?

  - by Protector one

  I often come across very impressive mods for PC games that don't have an official editor, other development tools or its source code publicly available. (Take this amazing Multiplayer mod for Just Cause 2, for example.) How do you go about creating mods for such games? I'm not talking about replacing the odd texture or 3D model—that sort of thing seems fairly easy given tools to pry them out of game files and put them back in—but more along the lines of adding game behavior. (Tweaking settings files also doesn't count.) Note that I'm not asking "how to create a mod", I just want to know where to start or where to go to learn.

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• Is it a bad practice to include all the enums in one file and use it in multiple classes?

  - by Bugster

  I'm an aspiring game developer, I work on occasional indie games, and for a while I've been doing something which seemed like a bad practice at first, but I really want to get an answer from some experienced programmers here. Let's say I have a file called enumList.h where I declare all the enums I want to use in my game: // enumList.h enum materials_t { WOOD, STONE, ETC }; enum entity_t { PLAYER, MONSTER }; enum map_t { 2D, 3D }; // and so on. // Tile.h #include "enumList.h" #include <vector> class tile { // stuff }; The main idea is that I declare all enums in the game in 1 file, and then import that file when I need to use a certain enum from it, rather than declaring it in the file where I need to use it. I do this because it makes things clean, I can access every enum in 1 place rather than having pages openned solely for accessing one enum. Is this a bad practice and can it affect performance in any way?

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• Premultiplying matrices with Perspective destroys them

  - by Shadows In Rain

  If I apply world_to_camera, perspective and camera_to_screen to my mesh, everything is okay. But if I premultiply given matrices (i.e. transform = world_to_camera * perpective * camera_to_screen) before applying, then it seems like only perspective has effect. If it is important... My 3d framework was written from scratch (test project for job interview). But it works flawlessly, or at least I think so. So, question. This is expected behaviour, or my implementation is wrong?

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• Acer Extensa 5620 - Graphic unknown!

  - by Nycxzon

  I install Ubuntu 12.04 Beta 2, I found out the my graphic driver is "Unknown" and experience is "Standard". Please help me know how to install my graphic driver. as per my laptop specs: Mobile Intel GM965 Express Chipset with integrated 3D graphics, featuring Intel Graphics Media Accelerator (GMA) X3100 with up to 358/3845 MB of Intel Dynamic Video Memory Technology 4.0 (8 MB of dedicated system memory, up to 350/3765 MB of shared system memory), supporting Microsoft DirectX 9. Hope you can help me! Thanks in advance! Noob @ Ubuntu :) Updates! ______________ I found a solution! I found a site where I ask how to check the graphic of my system. by using terminal command "glxinfo" command ask me to install mesa-utils! and update. After that, My graphic driver is listed! Thanks for your continues support! :)

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• Do I need the 'w' component in my Vector class?

  - by bobobobo

  Assume you're writing matrix code that handles rotation, translation etc for 3d space. Now the transformation matrices have to be 4x4 to fit the translation component in. However, you don't actually need to store a w component in the vector do you? Even in perspective division, you can simply compute and store w outside of the vector, and perspective divide before returning from the method. For example: // post multiply vec2=matrix*vector Vector operator*( const Matrix & a, const Vector& v ) { Vector r ; // do matrix mult r.x = a._11*v.x + a._12*v.y ... real w = a._41*v.x + a._42*v.y ... // perspective divide r /= w ; return r ; } Is there a point in storing w in the Vector class?

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• How to set sprite source coordinates?

  - by ChaosDev

  I am creating own sprite drawer with DX11 on C++. Works fine but I dont know how to apply source rectangle to texture coordinates of rendering surface(for animation sprite sheets) //source = (0,0,32,64); //RECT D3DXVECTOR2 t0 = D3DXVECTOR2( 1.0f, 0.0f); D3DXVECTOR2 t1 = D3DXVECTOR2( 1.0f, 1.0f); D3DXVECTOR2 t2 = D3DXVECTOR2( 0.0f, 1.0f); D3DXVECTOR2 t3 = D3DXVECTOR2( 0.0f, 1.0f); D3DXVECTOR2 t4 = D3DXVECTOR2( 0.0f, 0.0f); D3DXVECTOR2 t5 = D3DXVECTOR2( 1.0f, 0.0f); VertexPositionColorTexture vertices[] = { { D3DXVECTOR3( dest.left+dest.right, dest.top, z),D3DXVECTOR4(1,1,1,1), t0}, { D3DXVECTOR3( dest.left+dest.right, dest.top+dest.bottom, z),D3DXVECTOR4(1,1,1,1), t1}, { D3DXVECTOR3( dest.left, dest.top+dest.bottom, z),D3DXVECTOR4(1,1,1,1), t2}, { D3DXVECTOR3( dest.left, dest.top+dest.bottom, z),D3DXVECTOR4(1,1,1,1), t3}, { D3DXVECTOR3( dest.left , dest.top, z),D3DXVECTOR4(1,1,1,1), t4}, { D3DXVECTOR3( dest.left+dest.right, dest.top, z),D3DXVECTOR4(1,1,1,1), t5}, };

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• Most supported/easiest to get started gamedev language?

  - by user1009013

  In what language are the most libraries/frameworks (like lwjgl for Java, XNA for C#)? What language is the easiest to start making a game (very easy to get a 3D-environment rendered)? What language has the friendliest learning curve? Say I want to make a game and I don't know any programming languages, I want to develop for any platform(so don't give the answer "the one you know best/the platform you are working on"), then what is the best language to start with. I get this question a lot "I have this and that ideas for a game and want to make it, what language should I use"(mostly asked by beginning programmers), but I don't know how to answer that. The answer "use the one you are most familiar with", because sometimes they don't even know a language yet... I am not asking for someone's personal opinion, but an objective list of what languages are the easiest/most supported/have the most/best libraries/frameworks to get started with gamedevelopment.

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