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• Confusion on HLSL Samplers. Can I Set Samplers Inside Functions?

  - by Kyle Connors

  I'm trying to create a system where I can instance a quad to the screen, however I've run into a problem. Like I said, I'm trying to instance the quad, so I'm trying to use the same geometry several times, and I'm trying to do it in one draw call. The issue is, I want some quads to use different textures, but I can't figure out how to get the data into a sampler so I can use it in the pixel shader. I figured that since we can simply pass in the 4 bytes of our IDirect3DTexture9* to set the global texture, I can do so when passing in my dynamic buffer. (Which also stores each objects world matrix and UV data) Now that I'm sending the data, I can't figure how to get it into the sampler, and I really want to assume that it's simply not possible. Is there any way I could achieve this?

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• What is a good practice for 2D scene graph partitioning for culling?

  - by DevilWithin

  I need to know an efficient way to cull the scene graph objects, to render exclusively the ones in the view, and as fast as possible. I am thinking of doing it the following way, having in each object a local boundingbox which holds the object bounds, and a global boundingbox which holds the bounds of the object and all children. When a camera is moved, the render list is updated by traversing the global boundingboxes. When only the object is being moved, it tries to enlarge or shrink the ancestors global boundingboxes, and in the end updating or not the renderlist. What do you think of this approach? Do you think it will provide a fast and efficient culling? Also, because the render list is a contiguous list, it could accelerate the rendering, right? Any further tips for a 2D scene graphs are highly appreciated!

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• Identify "non-secure" content IE warns about [on hold]

  - by Doug Harris

  As many know, if you serve a page over https and the content loads resources (images, stylesheets, js, SWF objects, etc) over http, older versions of Internet Explorer will show the user a warning saying "This page contains both secure and non-secure items". This is discomforting to many non-technical users. Usually, I can look at the HTML source and identify which item(s) are triggering this error. Sometimes a Flash object will load something else or some embedded javascript will put a new object in the DOM and trigger this. What tools are good for quickly tracking down the source of the warning?

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• Dynamic navigation mesh changes

  - by Nairou

  I'm currently trying to convert from grids to navigation meshes for pathfinding, since grids are either too coarse for accurate navigation, or too fine to be useful for object tracking. While my map is fairly static, and the navigation mesh could be created in advance, this is somewhat of a tower defense game, where objects can be placed to block paths, so I need a way to recalculate portions of the navigation mesh to allow pathing around them. Is there any existing documentation on good ways to do this? I'm still very new to navigation meshes, so the prospect of modifying them to cut or fill holes sounds daunting.

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• User Already Exists in the Current Database - SQL Server

  - by bullpit

  I was moving a lot of databases from one SQL Server to another, and my applications were giving me errors saying "Login failed for <user>". The user was already in the database with appropriate rights to allowed objects in the database. I tried mapping the user to the database and that's when I got this message: "User Already Exists in the Current Database"... I googled and found this very useful post about orphaned users when moving databases. These are the steps you should take to fix this issue: First, make sure that this is the problem. This will lists the orphaned users: EXEC sp_change_users_login 'Report' If you already have a login id and password for this user, fix it by doing: EXEC sp_change_users_login 'Auto_Fix', 'user' If you want to create a new login id and password for this user, fix it by doing: EXEC sp_change_users_login 'Auto_Fix', 'user', 'login', 'password'

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• What causes the iOS OpenGLES driver to allocate extra memory?

  - by Martin Linklater

  I'm trying to optimize the memory usage of our iOS game and I'm puzzled about when/why the iOS GLES driver allocates extra memory at runtime... When I run our game through Instruments with the OpenGL ES Driver instrument the gartUsedBytes value can fluctuate quite wildly. We preload all our textures and build the buffer objects up front, so it's not the game engine requesting extra memory from GL. Currently we are manually requesting around 50MB of GL memory, yet the gartUsedBytes value sits at around 90MB most of the time, peaking at 125MB from time to time. It seems to be linked to what you are rendering that frame - our PVS only submits VBO's for visible meshes. Can anyone shed some light on what the driver is doing in the background ? Like I said earlier, all our game engine allocations are done on level load, so in theory there shouldn't be any fluctuation on GL memory usage while the level is running. Thanks.

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• Difference between Sound and Music

  - 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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• The how of a collision engine

  - by JXPheonix

  This is a very, very broad question - what is the general algorithm of how a collision engine works? No code in specific, but rather, just a general idea of how a collision engine does what it does, constantly refreshing the points of an object and comparing it to other objects? (see, I have the general gist of it here.) A collision engine is basically an engine used in games (generally) so that your player (call him Bob), whenever bob moves into a wall, Bob stops, Bob does not walk through the wall. They also generally handle the gravity in a game and environmental things like that.

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• Debugging-Setting Consoles in Games

  - by ShrimpCrackers

  Right now I have the graphical and input portions of a console for my game (command parsing hasn't been implemented yet). I was wondering how you would go about making changes to properties in game objects. For example, if I typed in the console: skeletonMonster maxHP 20 That would change all of the existing in-game skeletons' max hit points to 20. After you parse this information what are some ways to change the value? How can I change the variable(s) without violating information hiding? I'd like to implement this so I don't have to change variables in the code and recompile every time while playtesting.

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• Is Ruby on Rails' Active Record an example of Aspect-Oriented Programming?

  - by B Seven

  From Clean Code, about Cross-Cutting Concerns: Note that concerns like persistence tend to cut across the natural object boundaries of a domain. You want to persist all your objects using generally the same strategy, for example, using a particular DBMS... Is Active Record an example of aspect-oriented programming? In AOP, modular constructs called aspects specify which points in the system should have their behavior modified in some consistent way to support a particular concern. This specification is done using a succinct declarative or programmatic mechanism. If Active Record is an example of AOP, what is the "aspect"? Is it the class declaration that inherits from Active Record? class Foo < ActiveRecord::Base

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• Why is JavaScript not used for classical application development (compiled software)?

  - by Jose Faeti

  During my years of web development with JavaScript, I come to the conclusion that it's an incredible powerful language, and you can do amazing things with it. It offers a rich set of features, like: Dynamic typing First-class functions Nested functions Closures Functions as methods Functions as Object constructors Prototype-based Objects-based (almost everything is an object) Regex Array and Object literals It seems to me that almost everything can be achieved with this kind of language, you can also emulate OO programming, since it provides great freedom and many different coding styles. With more software-oriented custom functionalities (I/O, FileSystem, Input devices, etc.) I think it will be great to develop applications with. Though, as far as I know, it's only used in web development or in existing softwares as a scripting language only. Only recently, maybe thanks to the V8 Engine, it's been used more for other kind of tasks (see node.js for example). Why until now it's only be relegated only to web development? What is keeping it away from software development?

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• Open .doc file from my website in browser

  - by seth

  What's the best way to give the end-user of my web application the ability to open, edit and save (via browser) word documents that are stored in my database? I have this working by doing an html conversion of the file (via Aspose Words) but this method seems not even close to flawless and i'm trying to improve this. Is integrating with google docs possible/good? Their edition seems awesome and very powerful. I can't use any Microsoft Word objects (and this is even discouraged by MS). EDIT: The application is developed in .NET and currently uses the .NET framework 2.0. However, as this is fairly obsolete the idea is to restart from scratch and therefore use the 4.0 framework and C# or VB.

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• XNA: Runtime differences in ClickOnce install versus development version

  - by Sean Colombo

  I have a game written in XNA, and I use ClickOnce installers to distribute the game to testers. I keep once computer as a test machine which does NOT have development environments installed, so that I can test the installed version. We've found a reproducible bug in our game, but the bug ONLY occurs on the non-development machines that use the ClickOnce installer. The bug is related to some of our code for moving around 3D objects and is not tied to Networking or GamerServices. Are there known differences in the ClickOnce runtime and the version on dev? Are there any best-practices for debugging something like this?

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• Grid based collision - How many cells?

  - by Fibericon

  The game I'm creating is a bullet hell game, so there can be quite a few objects on the screen at any given time. It probably maxes out at about 40 enemies and 200 or so bullets. That being said, I'm splitting up the playing field into a grid for my collision checking. Right now, it's only 8 cells. How many would be optimal? I'm worried that if I use too many, I'll be wasting CPU power. My main concern is processing power, to make the game run smoothly. RAM is not a big concern for me.

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• In OpenGl ES 2, should I allocate multiple transformation matrices?

  - by thm4ter

  In OpenGl ES 2, should I declare just one transformation matrix, and share it across all objects or should I declare a transformation matrix in each object that needs it? for clarification... something like this: public class someclass{ public static float[16] transMatrix = new float[16]; ... public static void translate(int x, int y){ //do translation here } } public class someotherclass{ ... void draw(GL10 unused){ someclass.translate(10,10); //draw } } verses something like this: public class obj1{ public static float[16] transMatrix = new float[16]; ... void draw(GL10 unused){ //translate //draw } } public class obj2{ public static float[16] transMatrix = new float[16]; ... void draw(GL10 unused){ //translate //draw } }

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• Test Doubles : Do they go in "source packages" or "test packages"?

  - by sbrattla

  I've got a couple of data access objects (DefaultPersonServices.class, DefaultAddressServices.class) which is responsible for various CRUD operations in a database. A few different classes use these services, but as the services requires that a connection is established with a database I can't really use them in unit tests as they take too long. Thus, I'd like to create a test doubles for them and simply do FakePersonServices.class and FakeAddressService.class implementations which I can use throughout testing. Now, this is all good (I assume)...but my question relates to where I put the test doubles. Should I keep them along with the default implementations (aka "real" implementations) or should I keep them in a corresponding test package. The default implementations are found in Source Packages : com.company.data.services. Should I keep the test doubles here too, or should the test doubles rather be in Test Packages : com.company.data.services?

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• Does FP mess up your OOP skills?

  - by bonomo

  I've been learning functional programming in Haskell and F# for awhile and now when I got some skills it gets harder for me to think in OOP way and program in C# and JavaScript. Everything seems to be ass-backwards there with classes, interfaces, objects and I often stare at the screen trying to think of a better way around without using them. This is something that scares me, because I didn't have problems like that before (not knowing that the same stuff can be done in a different way). So I am concerned as I don't want to loose myself as a OOP developer, because this is what I do for living. Is it a normal thing? Shall I rather stop doing FP? How did you manage to cope with it?

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• XNA Drag Gestures - fractional delta values

  - by Den

  I have an issue with objects moving roughly twice as far as expected when dragging them. I am comparing my application to the standard TouchGestureSample sample from MSDN. For some reason in my application gesture samples have fractional positions and deltas. Both are using same Microsoft.Xna.Framework.Input.Touch.dll, v4.0.30319. I am running both apps using standard Windows Phone Emulator. I am setting my break point immediately after this line of code in a simple Update method: GestureSample gesture = TouchPanel.ReadGesture(); Typical values in my app: Delta = {X:-13.56522 Y:4.166667} Position = {X:184.6956 Y:417.7083} Typical values in sample app: Delta = {X:7 Y:16} Position = {X:497 Y:244} Have anyone seen this issue? Does anyone have any suggestions? Thank you.

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• Deforming surfaces

  - by Constantin

  I try to accomplish an deforming physic behaviour for levelsurfaces, but don't get an idea how to start with the implemenation so far. Regardless of the shape from the surface (planes, cubes, spheres…), I want to have small indentations at the positions from game-entitys (players, enemys, objects…). It's kind of complicated to explain, so I illustrated what I'm talking about (here is an example with an sphere): So, the surfaces should be able to deforming themselfs a little bit (to apear like an really soft bed or sofa). My surfaces need probably an high vertices count to get an smooth deforming, but my big problem is the math for calculating this deforming… I'm programming in C/C++ with OpenGL, but will be fine with any advices in the right direction. Any help would be highly appreciated,

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• Material usage, one per model or per object?

  - by WSkid

  Is it better (memory, time (of developer), space) to use single model that is unwrapped and uses a single material or to break a model down into appropriate bits, each with their own smaller texture/material? Or does it depend on the target platform as to what is acceptable - ie PC vs tablet? An example: Say you have a typical house with a tiled roof. Model it, make sure everything is attached, unwrap the walls/roof so in your UV template the walls and roof would be in one texture file, side-by-side in say a 512x512 file. Model the roof/walls as separate objects, unwrap them individually and have two UV templates. You could then have a 256x256 file for each one.

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• Why do we use networking libraries instead of plain NSURLRequests and NSURLConnection ?

  - by Amogh Talpallikar

  in iOS development, I have often seen people creating a networking module to interact with their APIs. This module generally sits on top of a networking framework like MKNetWorkKit or AFNetWorking. In most of the cases, It's all about sending GET,POST request and parsing the response which is in most cases JSON. What extra practical benefits that these libraries provide that an iOS developer should be leveraging which the plain Cocoa Networking APIs lack ? I can understand RESTKit as one exception where it takes care of the conversion of JSON to native objects and also interfaces with Core Data but what about others ?

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• How to render a retro-like pixel graphics from 3d models?

  - by momijigari

  I was wondering if there's a possibility to render a retro-pixel-like graphics from 3d model in real time? I'm talking about the Starfarer-like graphics. I know it's hand drawn, and it's 2d. But if I need a 3d objects with the same aesthetics? I'm currently working with Flash. But I don't need any ready-solutions, I just want to understand the principle from any other platform if there is one. So if anybody met anything like this I would appreciate your help. (If it's not possible to do in real time, I could at least pre-render a sequence of sprites. It would be much better than creating hundreds of hand-drawn ones)

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• How important is to avoid name collisions between libraries belonging to different domains?

  - by Sergio

  I have written a small open source Java library for facilitating conversions between different types of objects (in the style of Google's gson, but quite more general). It seems to me that a nice natural name for my library is JConverter, after browsing in the web to see if another library with the same name already exists, I found a library with the same name for Joomla. My concrete question is: How important is to avoid naming collisions when creating an open source library if an existing library with the chosen name already exists in a complete different domain ? (in my concrete case, these are libraries even implemented for different languages).

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• How best to merge/sort/page through tons of JSON arrays?

  - by Joshiatto

  Here's the scenario: Say you have millions of JSON documents stored as text files. Each JSON document is an array of "activity" objects, each of which contain a "created_datetime" attribute. What is the best way to merge/sort/filter/page through these activities via a web UI? For example, say we want to take a few thousand of the documents, merge them into a gigantic array, sort the array by the "created_datetime" attribute descending and then page through it 10 activities at a time. Also keep in mind that roughly 25% of these JSON documents are updated every day, and updates have to make it into the view within 5 minutes. My first thought is to parse all of the documents into an RDBMS table and then it would just be a simple query such as "select top 10 name, created_datetime from Activity where user_id=12345 order by created_datetime desc". Some have suggested I use NoSQL techniques such as hadoop or map/reduce instead. How exactly would this work? For more background, see: Why is NoSQL better for this scenario?

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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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