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• Using Instance Nodes, worth it?

  - by Twitch

  I am making a 2d game where there are various environments with lots and lots of objects. There is a forest scene with like 1200 objects in total(trees mainly), of which around 100 are visible on the camera at any given time, as you move through the level. These are comprised of around 20 different kind of trees and other props. Each object is usually 2-6 triangles with a transparent texture. My developer asked me to replace each object in the scene with a node, and keeping only a minimal amount of actual objects which would be 300+ or so(?), since there are a few modified unique meshes. So he can instantiate the actual objects to keep the game light. Is this actually effective? And if so how much? I 've read about draw calls and such and I suppose that if I combine each texture (10 kinds of trees) in 1 mesh it will have the same effect?

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• When JDeveloper IDE doesn't render the visual editor

  - by Frank Nimphius

  Though with Oracle JDeveloper 11g the problem of the IDE not rendering JSF pages properly in the visual editor has become rare, there always is a way for the creative to break IDE functionality. A possible reason for the visual editor in JDeveloper to break is a failed dependency reference, which often is in a custom JSF PhaseListener configured in the faces-config.xml file. To avoid this from happening, surround the code in your PhaseListener class with the following statement (for example in the afterPhase method) public void afterPhase(PhaseEvent phaseEvent) {   if(!ADFContext.getCurrent().isDesigntime()){ ... listener code here ... } } The reason why the visual editor in Oracle JDeveloper fails rendering the WYSIWYG view has to do with how the live preview is created. To produce the visual display of a view, JDeveloper actually runs the ADF Faces view in JSF, which then also invokes defined PhaseListeners. With the code above, you check whether the PhaseListener code is executed at runtime or design time.If it is executed in design time, you ignore all calls to external resources that are not available at design time.

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• Getting data from a webpage in a stable and efficient way

  - by Mike Heremans

  Recently I've learned that using a regex to parse the HTML of a website to get the data you need isn't the best course of action. So my question is simple: What then, is the best / most efficient and a generally stable way to get this data? I should note that: There are no API's There is no other source where I can get the data from (no databases, feeds and such) There is no access to the source files. (Data from public websites) Let's say the data is normal text, displayed in a table in a html page I'm currently using python for my project but a language independent solution/tips would be nice. As a side question: How would you go about it when the webpage is constructed by Ajax calls?

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• Windows 7/ 12.04 Dual Boot Mess

  - by Ben

  I am certainly new to ubuntu (linux in general)... I added ubuntu 12.04 as a dual boot to a brand new desktop which had win 7 pre-installed. Both work well Then I tried to change the order of the boot menu to make Ubuntu first and Win7 second... I did this from the windows side (it seems that my setup is relying on windows bootloader, which I don't think I need to change) using the built-in startup manager (I think that's what windows calls it- it's in the control panel). I set Ubuntu as first (default if no user input). then... I ACCIDENTALLY ("hmmm...I wonder what this button does?") set the menu timeout to "0" Now, I cannot change the menu timeout (because I cannot get into windows) and without doing so, I cannot select windows as the OS I would like to boot(I cannot get into windows). Any Ideas?

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• Creating a DrawableGameComponent

  - by Christian Frantz

  If I'm going to draw cubes effectively, I need to get rid of the numerous amounts of draw calls I have and what has been suggested is that I create a "mesh" of my cubes. I already have them being stored in a single vertex buffer, but the issue lies in my draw method where I am still looping through every cube in order to draw them. I thought this was necessary as each cube will have a set position, but it lowers the frame rate incredibly. What's the easiest way to go about this? I have a class CubeChunk that inherits Microsoft.Stuff.DrawableGameComponent, but I don't know what comes next. I suppose I could just use the chunk of cubes created in my cube class, but that would just keep me going in circles and drawing each cube individually. The goal here is to create a draw method that draws my chunk as a whole, and to not draw individual cubes as I've been doing.

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• Dynamic content realoding

  - by Kikaimaru

  Is there a relatively simple way to dynamicaly reload content files? (ie: effect files) I know i can do following: Detect change of file Run content pipeline to rebuild that specific file Unload ALL content that was loaded Load All content And use double references to reference content files. Problem is with step 3 (and step 2 isn't that nice too). But i need to unload everything because if i have model Hero.x which references Model.fx effect, and i change Model.fx file, i need to reload Hero.x file which will then call LoadExternalReference on Model.fx. So I guess question is, did someone mange to make this work without rewriting whole ContentManager (and every ContentReader) and tracking calls to LoadExternalReference?

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• Abandoment to blame?

  - by Larsenal

  I have a code snippet for an app that users are loading as a 3rd party script on their site. The general sequence is as follows: Site loads "http://www.example.com/foo.js" foo.js does stuff 1 to 2 seconds later, foo.js loads bar.js Now in a perfect world, I'd want to see matching counts for the calls to foo.js and bar.js. However, bar.js loads only about 94% of the time. I'm wondering how much of this discrepancy might be attributable to site abandonment given the fact that bar.js is delayed by 1 or 2 seconds. I posted here instead of StackOverflow since I think it's more a question about what would be typical time on page when users abandon the page.

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• How to reduce noise in Skype?

  - by tkc

  According to Alsamixer I do have a HDA Intel soundcard with Nvidia MCP77/78 HDMI chip (Realtek sound card on MSI notebook). When I use Skype under Ubuntu 12.04 for video calls, the other side hears background noise such as in Windows when you have your microphone boosted. In fact they can hear everything, even the fans turning on. There is nothing tweaked on Ubuntu's fresh installation. Also tried this site: https://code.launchpad.net/~ubuntu-audio-dev/+archive/alsa-daily/+packages , but there are no *.deb files that I can test if any fix the problem. The question is if there is a way to add/tweak something to enable on software level the noise cancellation like the Windows sound drivers have that option. I use my build in mic.

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• Selective bandwidth shaping

  - by the_candyman

  I was searching something for bandwidth shaping. I found trickled and wondershaper which works on the total bandwidth. I would like to know if there exists a selective bandwidth shaping. I mean, I run 2 application which uses internet. I would like to limit the bandwidth of one of these 2 in real time (just like a sound equalizer). For example, I'm downloading something. Meanwhile, someone calls me on skype. So I want to slow the downloading to have more band in my video calling. Is this possible?

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• Java Phones: How to set up JTAPI?

  - by Adam Tannon

  I want to use JTAPI (1.4 - latest) to create an app that will call my phone whenever I need it to. I downloaded JSR043 (JTAPI specification) and have been reading the API docs and it seems pretty straight forward with respect to how to code JTAPI. However I seriously doubt that getting a Java app on my laptop to call my cell phone doesn't require some 3rd party or middle man service provider and possibly other entities/configurations as well. So I ask: besides using the JTAPI in my Java code, what do I need to install or set up to have a Java app that calls my phone? Thanks in advance!

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• Lua and multi-paradigm programming: scope and capabilities

  - by Ef Es

  Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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• How To Delete Your Skype Call and Chat History

  - by Gopinath

  Just like every other modern application, Skype also records all the communications we exchange using it. It records instant messages, calls, file transfers, SMS, etc. and makes it easy to view using the Conversation tab. If you ever feel like getting rid of these history information, then you need to delete them. Skype provides a single click option to clear all the history from you account, but the feature is buried deep under options menu.Really deep!. To clear history follow the menu Tools –> Options, switch to Privacy Settings tab available on the left side, click on Show advanced options button and finally hit the button Clear history. Ah! You are almost done. Just confirm a popup it displays on screen and your history is vanished from your account. Join us on Facebook to read all our stories right inside your Facebook news feed.

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• Getting the front buffer into a gfx mem surface (Dx9)

  - by lapin

  I'm using DirectX 9 to acquire the frontbuffer. There are a couple of ways I know of to get at the front buffer: GetRenderTargetData() GetFrontBufferData() The MSDN page on both of these API calls state that the data is copied from device memory to system memory. I'd like to copy the front buffer surface directly to another graphics memory surface, as I have other manipulations to perform on the acquired surface before returning it to system memory. I'm creating a D3DUSAGE_DYNAMIC texture (gfx mem texture) and calling GetFrontBufferData() to write the front buffer to my textures surface0. Is this valid? Will the operation remain in gfx memory, or will it need to move to system memory and then back to graphics memory? If this is the case, is what I'm trying to achieve possible?

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• Tester/Doer pattern: Assume the caller conforms to the pattern or be defensive and repeat the check?

  - by Daniel Hilgarth

  Assume a simple class that implements the Tester/Doer pattern: public class FooCommandHandler : ICommandHandler { public bool CanHandle(object command) { return command is FooCommand; } public void Handle(object command) { var fooCommand = (FooCommand)command; // Do something with fooCommand } } Now, if someone doesn't conform to the pattern and calls Handle without verifying the command via CanHandle, the code in Handle throws an exception. However, depending on the actual implementation of Handle this can be a whole range of different exceptions. The following implementation would check CanHandle again in Handle and throw a descriptive exception: public void Handle(object command) { if(!CanHandle(command)) throw new TesterDoerPatternUsageViolationException("Please call CanHandle first"); // actual implementation of handling the command. } This has the advantage that the exception is very descriptive. It has the disadvantage that CanHandle is called twice for "good" clients. Is there a consensus on which variation should be used?

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• What options are there for splitting UI layout from code logic using a markup language?

  - by Daenyth

  What tools similar to GWT's UIBinder exist in other languages? By this I mean a system where you can define your UI layout in a markup language (preferably html+css) and attach the functionality to the layout using the code. I'm most interested in anything for python, but answers in other languages would interest me as well. I'm interested because the benefits of having a non-programmer work directly on the layout without needing to touch the code and adjust a bunch of UI toolkit method calls is very productive. I'm aware of Flex for flash, but is there anything else out there? What search terms might I use to find such frameworks? I've looked around but I haven't found anything concrete.

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• Futures/Monads vs Events

  - by c69

  So, the question is quite simple: in an application framework, when performance impact can be ignored (10-20 events per second at max), what is more maintainable and flexible to use as a preferred medium for communication between modules - Events or Futures/Promices/Monads ? Its often being said, that Events (pub/sub, mediator) allow loose-coupling and thus - more maintainable app... My experience deny this: once you have more that 20+ events - debugging becomes hard, and so is refactoring - because it is very hard to see: who, when and why uses what. Promices (i'm coding in javascript) are much uglier and dumber, than Events. But: you can clearly see connections between function calls, so application logic becomes more straight-forward. What i'm afraid. though, is that Promices will bring more hard-coupling with them... p.s: the answer does not have to be based on JS, experience from other functional languages is much welcome.

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• Abandoment to blame for the last JavaScript file not always being loaded?

  - by Larsenal

  I have a code snippet for an app that users are loading as a 3rd party script on their site. The general sequence is as follows: Site loads http://www.example.com/foo.js foo.js does stuff 1 to 2 seconds later, foo.js loads bar.js Now in a perfect world, I'd want to see matching counts for the calls to foo.js and bar.js. However, bar.js loads only about 94% of the time. I'm wondering how much of this discrepancy might be attributable to site abandonment given the fact that bar.js is delayed by 1 or 2 seconds. I posted here instead of StackOverflow since I think it's more a question about what would be typical time on page when users abandon the page.

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• Using static in PHP

  - by nischayn22

  I have a few functions in PHP that read data from functions in a class readUsername(int userId){ $reader = getReader(); return $reader->getname(userId); } readUserAddress(){ $reader = getReader(); return $reader->getaddress(userId); } All these make a call to getReader() { require_once("Reader.php"); static $reader = new Reader(); return $reader; } An overview of Reader class Reader{ getname(int id) { //if in-memory cache exists for this id return that //else get from db and cache it } getaddress(int id) { $this->getname(int id); //get address from name here } /*Other stuff*/ } Why is class Reader needed The Reader class does some in-memory caching of user details. So, I need only one object of class Reader and it will cache the user details instead of making multiple db calls. I am using static so that it the object gets created only once. Is this the right approach or should I do something else?

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• OpenGL VBOs are slower then glDrawArrays.

  - by Arelius

  So, this seems odd to me. I upload a large buffer of vertices, then every frame I call glBindbuffer and then the appropriate gl*Pointer functions with offsets into the buffer, then I use glDrawArrays to draw all of my triangles. I'm only drawing about 100K triangles, however I'm getting about 15FPS. This is where it gets weird, if I change it to not call glBindBuffer, then change the gl*Pointer calls to be actual pointers into the array I have in system memory, and then call glDrawArrays the same, my framerate jumps up to about 50FPS. Any idea what I weird thing I could be doing that would cause this? Did I maybe forget to call glEnable(GL_ALLOW_VBOS_TO_RUN_FAST) or something?

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• svn-based versioning tool, problem with network timeout

  - by Scarlet

  My dev team was committed a versioning tool based on Subversion to run on Windows (our svn client is sliksvn). We're developing with Delphi XE2, should that matter. We're asked to implement a "check for updates availability" feature, which has to work as follows: Connect to the SVN repo via svn+ssh protocol; See if there are changes to receive and list them; Let the user decide if he wants to receive changes or not. We don't have a great knowledge on svn, so we thought to implement that thing client side by a certain number of CreateProcess calls that wrap directly proper svn commands. Anyways what we perceived is that if network problems should arise, such like a connection drop, svn client hangs forever waiting for the operation to close instead of failing for timeout. We know that CreateProcess can be given a timeout argument, but it wouldn't be correct to use it, as we can't know from outside how long will be the svn operation taking to complete. Is there any way to avoid that deadlock?

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• Is it reasonable for REST resources to be singular and plural?

  - by Evan

  I have been wondering if, rather than a more traditional layout like this: api/Products GET // gets product(s) by id PUT // updates product(s) by id DELETE // deletes (product(s) by id POST // creates product(s) Would it be more useful to have a singular and a plural, for example: api/Product GET // gets a product by id PUT // updates a product by id DELETE // deletes a product by id POST // creates a product api/Products GET // gets a collection of products by id PUT // updates a collection of products by id DELETE // deletes a collection of products (not the products themselves) POST // creates a collection of products based on filter parameters passed So, to create a collection of products you might do: POST api/Products {data: filters} // returns api/Products/<id> And then, to reference it, you might do: GET api/Products/<id> // returns array of products In my opinion, the main advantage of doing things this way is that it allows for easy caching of collections of products. One might, for example, put a lifetime of an hour on collections of products, thus drastically reducing the calls on a server. Of course, I currently only see the good side of doing things this way, what's the downside?

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• Is it wrong to use a boolean parameter to determine behavior?

  - by Ray

  I have seen a practice from time to time that "feels" wrong, but I can't quite articulate what is wrong about it. Or maybe it's just my prejudice. Here goes: A developer defines a method with a boolean as one of its parameters, and that method calls another, and so on, and eventually that boolean is used, solely to determine whether or not to take a certain action. This might be used, for example, to allow the action only if the user has certain rights, or perhaps if we are (or aren't) in test mode or batch mode or live mode, or perhaps only when the system is in a certain state. Well there is always another way to do it, whether by querying when it is time to take the action (rather than passing the parameter), or by having multiple versions of the method, or multiple implementations of the class, etc. My question isn't so much how to improve this, but rather whether or not it really is wrong (as I suspect), and if it is, what is wrong about it.

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• How to cache on CloudFlare images that are served to client as JSON?

  - by Askar Ibragimov

  I am using a gallery on my website that gets list of images from a JSON sent by a php script. So, the javascript gallery calls PHP backend and it replies with complex JSON where images are specified as object fields. These fields not necessarily include full URLs, merely a path to needed images. I'd like to use Cloudflare and want these images to be cached there. How I could learn whether these are cached or not, and make sure that these would be cached and not considered some sort of dynamic content?

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• How to create reproducible probability in map generation?

  - by nickbadal

  So for my game, I'm using perlin noise to generate regions of my map (water/land, forest/grass) but I'd also like to create some probability based generation too. For instance: if(nextInt(10) > 2 && tile.adjacentTo(Type.WATER)) tile.setType(Type.SAND); This works fine, and is even reproduceable (based on a common seed) if the nextInt() calls are always in the same order. The issue is that in my game, the world is generated on demand, based on the player's location. This means, that if I explore the map differently, and the chunks of the map are generated in a different order, the randomness is no longer consistent. How can I get this sort of randomness to be consistent, independent of call order? Thanks in advance :)

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• Steps after SQL Injection detected

  - by Zukas

  I've come across SQL injection vulnerabilities on my companies ecommerce page. It was fairly poorly put together. I believe I have prevented future attempts however we are getting calls about fraudulent credit card charges on our site and others. This leads me to believe that someone was able to get a list of our credit card numbers. What doesn't make sense is that we don't store that information and we use Authorize.net for the transaction. If someone was able to get the CC#s, what should I do next? Inform ALL of our customers that someone broken into our system and stole their information? I have a feeling that will be bad for business.

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