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• XNA Octree with batching

  - by Alex

  I'm integrating batching in my engine. However I'm using an octree which is auto generated around my scene. Now batching renders a hole group at ones while an octree sorts out which objects that should be rendered within the camera frustum, therefore dividing the group. Batching and octree doesn't go along very well, right? Problem: The way I see it I have two options, either create batch groups based on objects who are close to one another within the octree or I can rebuild the batching matrixbuffer for the instances visible each frame. Which approach should I go with or does there exist another solution?

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• What are the semantics of glRotate and glTranslate's parameters?

  - by Zarkopafilis

  I have been trying to play with OpenGL after watching some tutorials and I don't understand how the glTranslatef and glRotatef functions work. I believe a simple picture would help me. I understand that glTranslatef changes the position of the "camera" (but does it change the position in wich the shapes are getting drawn)? However, I don't understand the rotation concept at all. If I do glRotatef(1,0,0,1) it makes my quad spin around. If I just do glRotatef(1,0,0,0) it makes the quad smaller (further away) but if I try to rotate around the X or Y axis, I get a black screen. I don't understand the angle either. Help would be appreciated.

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• UBUNTU 11.10 will not boot after succesfully installed on 8GB usb 3.0 pendrive

  - by Oldrifle

  UBUNTU 11.10 on 8GB USB 3.0 pendrive. Drive Partitioned using gparted. 4GB BASE 3GB Home 600MB swap Installation Ok. Restart blinking cursor. Installed another distro on another USB 3.0 stick. It boots OK. --------------- DEBUG -------------------------------------- Boot Other distro and check: I compare boot file with another linux. grub of ubuntu is 1.4mb contend is different. Taken photo with mobile camera but can not add here. Files has note(music) sign on it. Downloaded 11.10 desktop and Installed. Same result. Will download 12.x when ready and try. Ready to try any suggestion.

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• Kinect pour PC bientôt disponible ? Microsoft prépare une variante de son capteur pour ordinateur

  Kinect pour PC bientôt disponible ? Microsoft prépare une variante de son capteur pour ordinateur Microsoft va développer une variante de son capteur de mouvement Kinect, spécifiquement pour les PC. Cette version s'appuie sur le dispositif Kinect pour la Xbox 360 avec des optimisations de certains composants matériels, et des ajustements du firmware pour une prise en charge des PC. Le dispositif offrira les caractéristiques et fonctionnalités sur Windows du capteur dont les développeurs et les consommateurs ont besoin. La caméra de profondeur sera capable de voir des objets d'aussi près de 50 centimètres sans perte de précision, et soutiendra un mode « proche » pour les applicatio...

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• MVC? patterns for game development? [closed]

  - by davivid

  Possible Duplicate: MVC-like compartmentalization in games? I am thinking of the best way to structure my project and was thought a MVC style pattern would be appropriate. Would be correct having the model handle the majority and basically being the game engine? Are there any standardised patterns recommended for simple game development? Model / Game Engine Data: Level Design, Chat feeds, etc Game Status: Player status, Enemy status, World Status etc etc. Engine: Physics, Collisions, AI View 3D: Gameplay, Camera, Rendering... 2D: UI etc Controller: Player Input UI Input

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• Do I lose/gain performance for discarding pixels even if I don't use depth testing?

  - by Gajoo

  When I first searched for discard instruction, I've found experts saying using discard will result in performance drain. They said discarding pixels will break GPU's ability to use zBuffer properly because GPU have to first run Fragment shader for both objects to check if the one nearer to camera is discarded or not. For a 2D game I'm currently working on, I've disabled both depth-test and depth-write. I'm drawing all objects sorted by their depth and that's all, no need for GPU to do fancy things. now I'm wondering is it still bad if I discard pixels in my fragment shader?

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• How to patch libgphoto2 for preview pictures in Shotwell while importing?

  - by Erraticus

  Under some circumstances, Shotwell shows no photo thumbnails while importing. I was trying to download some pictures from my camera (Canon EOS 400D) with Shotwell and the program didn't show any preview for the pictures before downloading them (it just shows a "forbidden" snapshot). After importing them everything seems fine. I've found this bug report but no solution is given for now. It seems there could be a solution for EOS cameras, according to the last comment. This guy links to a patch, but it's not downloadable. Any ideas of where to obtain a deb package of this patch or of any other solution?

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• La fabrication de l'iPad 2 plus fin et léger que le modèle précédent serait déjà en cours, d'après le Wall Street Journal

  La fabrication de l'iPad 2 serait déjà en cours d'après le Wall Street Journal Les rumeurs vont bon train sur le net depuis quelques mois concernant la prochaine tablette d'Apple. Le Wall Street Journal dans un article vient confirmer quelque une de ces rumeurs. Le journal, des sources proches du projet a annoncé qu'Apple aurait déjà commencé avec la production de l'iPad 2. La nouvelle tablette d'Apple sera beaucoup plus fine et plus légère que la précédente. Elle comprendra un processeur plus rapide, une plus grande mémoire, une caméra intégrée pour la vidéoconférence et un écran analogue au modèle actuel (Les rumeurs faisaient état d'un nouvel écran Retina). Le...

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• Comment les constructeurs répartissent-ils leurs dépenses pour les composants de leurs smartphones ? Un tableau interactif le montre

  Comment les firmes répartissent-elles leurs dépenses pour les composants de leurs smartphones ? Un tableau interactif le montre La firme américaine Tableau Software propose un tableau interactif qui permet d'en savoir plus sur les dépenses des firmes pour la fabrication de leurs smartphones. Si le prix moyen de la conception est assez semblable d'un modèle à l'autre, en revanche la façon dont les entreprises répartissent leurs dépenses varie de l'un à l'autre, et en fonction des composants. Par exemple, Apple fait les plus grosses dépenses pour les coques de ses téléphones ; Nokia ne compte pas lorsqu'il s'agit d'objectif caméra, etc. Source :

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• Install Ubuntu on iMac 21.5" (mid 2011)

  - by Mystic Mark le Maverick

  I has a dual boot system with MacOSX 10.8.2 and Microsoft Windows 7 Home Premium x64. I would like to install Ubuntu alongside the two existing operating systems for cross platform development purposes. My System specs are listed below. iMac 21.5-inch (mid 2011) Intel Core i7 @2.80GHz AMD Radeon HD 6770M Facetime HD Internet Camera Thunderbolt port Wireless Airport adapter card Apple 8x Superdrive Apple Magic Mouse and wired keyboard with numeric keypad Will rEFIt install properly on my machine too? Thanks you very much for the help.

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• What techniques can I use to render very large numbers of objects more efficiently in OpenGL?

  - by Luke

  You can think of my application as drawing a very large ball-and-stick diagram (or graph). At times, this graph can get very large, where the number of elements even outnumbers the pixels on the screen. Currently I am simply passing all of my textures (as GL_POINTS) and lines to the graphics card using VBO's. When the number of elements outnumbers the number of pixels, is this the most efficient way to do this? Or should I do some calculations on the CPU side before handing everything over to the GPU? If it matters, I do use GL_DEPTH_TEST and GL_ALPHA_TEST. I do some alpha blending, but probably not enough to make a huge performance difference. My scene can be static at times, but the user has control over a typical arc-ball camera and can pan, rotate, or zoom. It is during these operations that performance degradation is noticeable.

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• How can I stop pixel seams appearing in adjacent mesh boundaries due to floating point imprecision?

  - by ufomorace

  Graphics cards are mathematically imprecise. So when some meshes are joined by their borders, the graphics card often makes mistakes and decides that some pixels at the seam represent neither object, and unwanted pixels appear. It's a natural behaviour on all graphics cards. How are such worries avoided in Pro Games? Batching? Shaders? Different tangent vectors? Merging? Overlaping seams? Dark backgrounds? Extra vertices at borders? Z precision? Camera distance tweaks? Screencap of a fix that ended up not working:

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• How do professional games avoid showing pixel seams in adjacent mesh boundaries due to decimal imprecision?

  - by ufomorace

  Graphics cards are mathematically imprecise. So when some meshes are joined by their borders, the graphics card often makes mistakes and decides that some pixels at the seam represent neither object, and unwanted pixels appear. It's a natural behaviour on all graphics cards. How are such worries avoided in Pro Games? Batching? Shaders? Different tangent vectors? Merging? Overlaping seams? Dark backgrounds? Extra vertices at borders? Z precision? Camera distance tweaks? Screencap of a fix that ended up not working:

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• Using PhysX, how can I predict where I will need to generate procedural terrain collision shapes?

  - by Sion Sheevok

  In this situation, I have terrain height values I generate procedurally. For rendering, I use the camera's position to generate an appropriate sized height map. For collision, however, I need to have height fields generated in areas where objects may intersect. My current potential solution, which may be naive, is to iterate over all "awake" physics actors, use their bounds/extents and velocities to generate spheres in which they may reside after a physics update, then generate height values for ranges encompassing clustered groups of actors. Much of that data is likely already calculated by PhysX already, however. Is there some API, maybe a set of queries, even callbacks from the spatial system, that I could use to predict where terrain height values will be needed?

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• Windows Phone 8 : Nokia dégaine ses Lumia 920 et 820 pour contrer l'iPhone 5 et le Galaxy SIII, suffisant ?

  Windows Phone 8 : Nokia dégaine ses Lumia 920 et 820 Pour contrer l'iPhone 5 ou le Galaxy SIII, suffisant ? C'est peut dire que l'attente était grande, une semaine après la présentation du Samsung Ativ S et une semaine avant celle de l'iPhone 5. Les premiers Lumias de Nokia sous Windows Phone 8 devaient être annoncés. Les rumeurs parlaient de terminaux avec des batteries rechargeables sans fil. D'autres, d'écrans de 4.3 et de 4.5 pouces, de processeurs Dual Cores cadencés à 1.5GHz, et 1GB of RAM. On parlait également d'un APN/Caméra à 8 megapixels (décliné de la technologie PureView de Nokia à 41 Megapixels...

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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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• How to access the SD card through my Sony Ericsson Xperia Arc Phone?

  - by user16364

  I have a Sony Ericsson Xperia Arc phone and I cannot access its SD card through the USB cable provided. I have set the USB connection mode to MSC yet when I connect the phone to my computer I cannot see the SD card (or anything for that matter). The Disk Utility however, does see an SEMC Mass Storage device but it says that no media was detected. I have validated that the SD card works as I removed it from the camera and plugged it into a card reader and saw all the photos and files stored on it. I have validated that the phone works as I have connected it (in MSC mode) to my wife's Windows 7 computer. Can anyone please tell me how I can access the SD card on my phone.

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• Logitech C310 webcam problems

  - by haggai_e

  I've just installed a Logitech C310 webcam on my Ubuntu Oneiric machine, and I've got several problems. When I use cheese, if I set it to use the higher resolutions, the picture contain shadows and has distorted colors. Only with lower resolutions the picture looks okay. The above photos were taken with cheese. In addition, the camera's internal microphone didn't always work. When using it through pulseaudio, the sounds were fast and with high pitch. When using it directly through alsa it sounded fine. Any ideas?

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• How to access the SD card through my Sony Ericsson Xperia Arc Phone?

  - by user16364

  I have a Sony Ericsson Xperia Arc phone and I cannot access its SD card through the USB cable provided. I have set the USB connection mode to MSC yet when I connect the phone to my computer I cannot see the SD card (or anything for that matter). The Disk Utility however, does see an SEMC Mass Storage device but it says that no media was detected. I have validated that the SD card works as I removed it from the camera and plugged it into a card reader and saw all the photos and files stored on it. I have validated that the phone works as I have connected it (in MSC mode) to my wife's Windows 7 computer. Can anyone please tell me how I can access the SD card on my phone.

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• how do I upload photos from shotwell?

  - by Mags

  I only started using Ubuntu a couple months ago. I've been able to get pictures from my camera onto the machine. The system is very different for me and I'm trying to work it out on my own, but I have a homework assignment that requires me to upload JPG files of photos I take and I'm having a problem. When I click the button on the page to choose a file, I go into the different photo files and nothing shows up, but the screen where files would be turns a very faint orange, just a tint. I've tried putting the named photos on my desktop, but the upload screen doesn't recognize it at all. How can I use this software to upload my pictures? Thanks.

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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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• 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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• Kinect Fusion bientôt accessible au public, le système de numérisation 3D temps réel sera intégré au prochain SDK Kinect pour Windows

  Kinect Fusion bientôt accessible aux développeurs le système de numérisation 3D temps réel sera intégré dans le prochain SDK Kinect pour Windows La prochaine mise à jour du SDK de Kinect pour Windows intégrera Kinect Fusion. Kinect Fusion utilise un capteur Kinect mobile qui permet de capter des données de profondeur et de créer des modèles 3D de haute qualité, comme par exemple la modélisation d'une pièce et de son contenu. L'implémentation s'appuie sur le GPU pour le suivi de la caméra. Quant à la reconstruction de surfaces, elle fonctionne en interactif et en temps réel pour permettre la mise en oeuvre d'applications en réalité augmentée ou l'interaction homme-machine. K...

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• Three20 TTLauncherView Tutorial?

  - by Graeme

  Hi, I'm attempting to use TTLauncherView from the Facebook Three20 project in my app, but I'm not having much luck (I'm a bit of a newbie at this). Does anyone have any good tutorials at using it that I could read? FYI basically I need to pull images that a user chooses from the iPhone camera album, and display them as icons that when pressed lead to another view. Thanks.

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• RED 5 video server on Android mobile phone... Is there any Open Source port?

  - by Ole Jak

  RED 5 video server on Android mobile phone... Is there any Open Source port project? So like simple opensource live Camera Video \ Audio encoding to FLV... I need such Opensource project to create Android live video streaming client for my server (I want to encode video on clients into FLV)

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