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• Homemaking a 2d soft body physics engine

  - by Griffin

  hey so I've decided to Code my own 2D soft-body physics engine in C++ since apparently none exist and I'm starting only with a general idea/understanding on how physics work and could be simulated: by giving points and connections between points properties such as elasticity, density, mass, shape retention, friction, stickiness, etc. What I want is a starting point: resources and helpful examples/sites that could give me the specifics needed to actually make this such as equations and required physics knowledge. It would be great if anyone out there also would give me their attempts or ideas. finally I was wondering if it was possible to... use the source code of an existing 3D engine such as Bullet and transform it to be 2D based? use the source code of a 2D Rigid body physics engine such as box2d as a starting point?

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• Formatted Ubuntu partition & now grub says "error: no such partition" - can't enter windows

  - by qwBJ

  I had installed Ubuntu (current version: 11.xx) alongside Windows Vista. Now I formatted the Ubuntu partition & merged it with another partition (without thinking, obviously). Now, when I restart the computer, GRUB probably tries to find the old partition (which does no longer exist) and says: error: no such partition. grub rescue> Now I dont know what to do (I'm a total beginner). I tried to re-install Ubuntu on the newly formatted partition but this won't work, because after removing the install-usb (which I am said to do during installation) I find the above error-message again. I guess I need some way to reconfigure grub OR to reinstall grub/ubuntu (on the newly formatted partition) OR to reinstall the windows boot manager (without reinstall. Windows), but I have no idea how to do either of these things.

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• Failed update of Ubuntu 10.10 results in unbootable system

  - by chessweb

  Hi, yesterday I performed an automatic security update suggested by the update manager on my virtualized (with VirtualBox on a Windows 7 host) Ubuntu 10.10 installation. The update somehow failed and left me with an unbootable system. When I try to boot, I am told that various folders, files, and what not are missing. Then the system drops into a busybox and leaves me with an (initramfs) prompt. This happens with all kernels I get offered by GRUB, although the error messages are quite different from kernel to kernel. Well, the short of it is this: I don't have the slightest idea on how to get back to a working system and this site is the final straw I'm willing to grab. A complete disaster like this following an update initiated and executed by the system is unheard of in Windows-land; at least I haven't heard of it, yet, and therefore I am going to abandon Ubuntu and Linux altogeteher, if there is no remedy. Regards, RSel

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• Random map generation

  - by Thomas Owers

  I'm starting/started a 2D tilemap RPG game in Java and I want to implement random map generation. I have a list of different tiles, (dirt/sand/stone/grass/gravel etc) along with water tiles and path tiles, the problem I have is that I have no idea where to start on generating a map randomly. It would need to have terrain sections (Like a part of it will be sand, part dirt, etc.) Similar to how Minecraft is where you have different biomes and they seamlessly transform into each other. Lastly I would also need to add random paths into this as well going in different directions all over the map. I'm not asking anyone to write me all the code or anything, just piont me into the right direction please. tl;dr - Generate a tile map with biomes, paths and make sure the biomes seamlessly go into each other.

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• Server Side Developer Prerequisites

  - by Jking

  I am new to server side development and am currently learning node.js. What sort of networking information should I be familiar with to allow for a smooth learning curve with server side development. Could anyone provide resources pertaining to the information required to get into server programming? To give you a better idea of my standpoint: I do not know how a server interacts with a database [Q: How does a NoSQL database, or database in general, communicate with a server?] I am unsure of how a web stack works [Q: I have heard of LAMP but do not know how Apache, MySQL, and PHP interact. Hopefully this applies to other stacks as well. How do the components of a stack work together? Also, is a MEAN stack an alternative, or is it completely irrelevant to this] I have trivial knowledge of internet protocol [however extremely inefficient][Q: What resources are beneficial when learning about networking, and how much/what knowledge should I acquire to program on the server side] I am unsure of what I am unsure of concerning networking information necessary to start development Information on how the client-server model works would be greatly appreciated

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• deciphering columnar transposition cipher

  - by Arfan M

  I am looking for an idea on how to decipher a columnar transposition cipher without knowing the key or the length of the key. When I take the cipher text as input to my algorithm I will guess the length of the key to be the factors of the length of the cipher text. I will take the first factor suppose the length was 20 letters so I will take 2*10 (2 rows and 10 columns). Now I want to arrange the cipher text in the columns and read it row wise to see if there is any word forming and match it with a dictionary if it is something sensible. If it matches the dictionary then it means it is in correct order or else I want to know how to make other combinations of the columns and read the string again row wise. Please suggest another approach that is more efficient.

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• Flash video streaming choppy for Chrome, alright for Firefox

  - by Ben

  I'm using Ubuntu 12.04.1, Chrome 21 and Firefox 15. Flash player 11.2 has been installed, and I've just started using Ubuntu... yesterday. And I'm using a Lenovo T61. The problem is that it doesn't matter if it's youtube or vimeo or some other flash player, it streams fine on chrome but every 30 seconds or so, there is a pause in video playback (with audio continuing) before it catches up, skipping quite a few seconds of video. It works perfectly fine in Firefox, and I've tried disabling PepperFlash/libpepflashplayer.so in Chrome but it doesn't seem to affect the performance. Anyone know how to work around this? It's more a problem of convenience because I don't like the idea of having to switch between Chrome and Firefox just to watch videos.

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• Do you actively look for a better job?

  - by Ace

  ...Even though you're basically happy where you are? I've been thinking for a while that it might be a good idea to look around, but how do you go about doing it? Do you hide the fact from your employer? What do you tell the recruiters? Can you play your current employer out against the new recruiter or vice versa, and how do you do that? Any pitfalls? Edit: I've bolded the questions that people haven't really answered yet.

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• minidlna and samsung tv file format doesn't support

  - by Vasya

  I have PC with XUbuntu 12.04 and Samsung 27A950, so I want to use my PC like dlna server. But I can run file of any format on my TV, get error: "File format doesn't support". I try to open *.avi, *.mkv and *.jpg files the same result. In error log I can see: [2013/06/27 12:34:03] upnphttp.c:1907: error: Error opening /home/family/media/file1.mkv [2013/06/27 12:34:06] upnphttp.c:1907: error: Error opening /home/family/media/file2.avi So, I have no idea why it doesn't work. Any suggestions? miniDLNA version: Version 1.24.1-stedy Config file is default, only few directories added. With version of the default Ubuntu repository was the same. Some time ago I tried mediatomb, had the same error.

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• alternative to environment variables

  - by tonyl7126

  The amount of servers and the complexity of our application is growing and we now have servers in different regions (hosted on AWS). Certain database operations require low latency so we have stuck a database in each region (which is basically a user cache) to keep the network latency low. The way the application server currently knows which user cache/database to make its call to depends on an environemnt variable set in it. This has been working fine, but it seems hacky and not optimal. Is there any way for this to be done automatically? I was considering using a package like fping and pinging each database when the app server reloads (or caching it the first time) and using the corresponding latencies to decide which database has the lowest latency for each app server. Not sure if this is the best idea though.

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• How to get paid and figure out if I want to keep this client [migrated]

  - by Heiner Fawkes

  I have a client who is not paying on time, but it looks like the specifics don't match similar questions on this SE site. I got a call from a client I did website work for years ago. I had not done this kind of work for many years and frankly I'm not sure I want to now, but nevertheless about a month ago I agreed to bring his website, SEO, social media, and overall marketing for his small business up to speed. Why? He has told me many times how I'm the most honest, most well-informed contractor he's had experience with. And I personally kind of like him too. So I started working on an hourly basis. I sent one very small invoice and got paid. Then we talked a whole lot about all sorts of feature he would like me to implement. I started that work, and sent a second invoice on the first of the month (one of my two stated billing days). I didn't get paid. On every invoice it states that I charge a whopping ten percent per week late. I sent many voicemails and emails asking to please let me know what's going on with payment, and didn't get replies. Then the 15th of the month rolled around (which I stated initially as one of my invoicing dates). Since I hadn't been paid for the last invoice, I simply didn't send him an invoice at that time but emailed him and said that I will combine it with the next scheduled invoice for this reason (probably a bad idea I realize). Eventually he sent a portion of the invoice payment. I emailed back to let him know that he's three weeks late and what the remaining balance is. Finally we got in touch via phone. He basically told me that he thought I hadn't done all of the work I said I did. He looked at the page source code and it didn't look complete to him. I explained why his perception would be different and what work I had done as specified. He accepted this and said that part of the reason he didn't pay in full is that he's been swamped with personal family stuff, and part of the reason is that he didn't think I did all the work. That struck me as pretty weird. He also expressed concern that he has no idea now how much all the changes he has asked for are going to cost. And once again, he told me how honest and high-quality my services are compared to others he has dealt with. He also said he would pay me more (but not all) of the now three weeks overdue invoice that day. I didn't receive any payment. Basically this is how the client relationship strikes me: He's not good at communication. He's very busy and English isn't his first language. He almost never replies to emails but phone calls are fine. He's asked me to avoid emails for communication and I've asked him to please use email. He might not have enough money to afford all the things he has asked for. But so far I have been working for an hourly fee (which is quite high). He also has started paying monthly for hosting and social media services from me. What seems very abnormal is for a client to be so overdue on payments and to actually withhold payment of an invoice without any communication because he didn't think the work was done. I told him that I will send dollar estimates of each module of remaining work so that we can decide which ones are the highest priority if he cannot afford them all. I also reiterated that in the future if he has doubts about the work or an inability to pay, he must contact me immediately to say so. I basically plan to state the following to him: I would like to work for him and help his business. I also have sympathy for his recent family difficulties. I am happy to figure out payment plans that would work better for him, but first I need to be paid in full for all outstanding invoices, especially given that I skipped one of them just to be nice. The most crucial thing I need is communication about any problems with my work or his ability to pay. Once again, he heeds to pay in full immediately before we negotiate anything else. Does the above seem like an appropriate communication? Is anything missing from it? Is anything I'm doing here really abnormal?

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• adding noindex on pagination

  - by Damodar Bashyal

  I find few conflicts on people's reactions about adding noindex on paginations. What does pro webmasters has to say about this? I am planning to add noindex meta for all paginations with a hope to increase website value, so I would like some pro's feedback on this. e.g. here: http://w3tut.org/blog 3 posts' first few paragraphs are displayed and meta is taken from first post from that page, which will cause duplicate meta issue. Also, 3 posts in a page could be unrelated to each other as well. Is it a good idea to add noindex for these pages, so full article posts get more value?

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• How much is modern programming still tied to underyling digital logic?

  - by New Talk

  First of all: I've got no academic background. I'm working primarily with Java and Spring and I'm also fond of web programming and relational databases. I hope I'm using the right terms and I hope that this vague question makes some sense. Today the following question came to my mind: How much is modern programming still tied to the underlying digital logic? With modern programming I mean concepts like OOP, AOP, Java 7, AJAX, … I hope you get the idea. Do they no longer need the digital logic with which computers are working internally? Or is binary logic still ubiquitous when programming this way? If I'd change the inner workings of a computer overnight, would it matter, because my programming techniques are already that abstract? P. S.: With digital logic I mean the physical representation of everything "inside" the computer as zeroes and ones. Changed "binary" to "digital".

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• Live examples of the Windows Azure Platform running Java and Ruby on Rails

  - by Eric Nelson

  At QCon in March we had a booth focused on interoperability out of which came the idea to create an application implemented in both Java and Ruby on Rails, running on top of the Windows Azure Platform. Nothing fancy, just an application to capture attendees view on Microsoft and Interoperability. It was implemented by Active Web Solutions, long time fans of Azure. Wroth a quick squint :-) Check out the related links below for info to get you up and running. Check out The Java version http://ukinterop.cloudapp.net/  The Ruby on Rails version http://rubyukinterop.cloudapp.net/ (run out of time to finish this one) Related Links: Tomcat Solution Accelerator http://code.msdn.microsoft.com/winazuretomcat AzureRunMe http://azurerunme.codeplex.com/ UK Azure Online Community – join today. UK Windows Azure Site Start working with Windows Azure

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• How do I play a Blu Ray disc?

  - by hugocreal

  Hello All, I want play a Blu Ray Video from my hard drive with Boxee, but it chokes all the time, i try play with others video players but is the same. I think that is a 10gb .mkv file with 10Gb. Stuttering video with VLC , mplayer, and the default video player on ubuntu... I read in many Forums just can´t put this to work. Any idea? thanks. Ubuntu 10.10, My PC specs: Single Core 2Ghz ATI HD 4350 (i have installed the drivers from "Hardware Drivers"), 2G Memory

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• What datastructure would you use for a collision-detection in a tilemap?

  - by Solom

  Currently I save those blocks in my map that could be colliding with the player in a HashMap (Vector2, Block). So the Vector2 represents the coordinates of the blog. Whenever the player moves I then iterate over all these Blocks (that are in a specific range around the player) and check if a collision happened. This was my first rough idea on how to implement the collision-detection. Currently if the player moves I put more and more blocks in the HashMap until a specific "upper bound", then I clear it and start over. I was fully aware that it was not the brightest solution for the problem, but as said, it was a rough first implementation (I'm still learning a lot about game-design and the data-structure). What data-structure would you use to save the Blocks? I thought about a Queue or even a Stack, but I'm not sure, hence I ask.

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• How to integrate game logic in game engines

  - by MahanGM

  Recently I'm working on a 2d game engine example in .Net with C#. My main problem is that I can't figure out how I should include the game logic within the game. Currently I have a base engine which is a set of classes that they are running sub-systems like Render, Sound, Input and Core functionality. There is an editor which helps the user to add resources, build levels, write scripts and other stuffs. I came up with an idea to use Reflection and CSharpCodeProvider from my editor to compile the written code. This way I can get an executable of my product too. This way is quite well but I would like to know what's really the solution and architecture to do this. My engine's role is 2d platform. The scripting language is C# right now because I can't consist any other embeddable language for now. The game needs compilation and CSharpCodeProvider is the only way for me to do it meantime.

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• Mouse pointer size problem

  - by Rasmus Pedersen

  My mouse cursor is double the normal size. Its only the default pointer that is enlarged. Variations like resize, busy and so on are the correct size. The problem persists even when I change cursor theme. If I move the cursor inside a Firefox window it changes to the correct size. My resolution is 2560x1440, its a single screen setup. Nvidia-settings reports my DPI to be: 108x107. I've tired to force that DPI in the LightDM conf, since I figured it must have something to-do with the DPI calculation. I have tried to change the cursor size through dconf but the problem still remains. I haven't seen this problem before, it arrived after the upgrade from Beta 2 to release version of Ubuntu 11.10. Anybody got any idea what the problem might be, its pretty annoying with the huge cursor.

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• Redirect a url to another url in IIS 7.5

  - by Jason White

  I have no idea why this isn't working. I've tried creating map rules and then rewritng and redirecting the url. I've tried just redirecting it with a simple rewrite rule and no matter what, the only time I can get it to work is if I set the match url to match this regex .*. I'm trying to redirect webmail.example.com to mail.example.com. Seemed like it would have taken but a couple seconds; boy was I wrong. I'm thinking I must be doing something wrong with the regex, but I'm not sure what as when I test it it seems to work fine. <rule name="webmail" patternSyntax="ECMAScript" stopProcessing="true"> <match url=".*webmail.*" /> <conditions logicalGrouping="MatchAll" trackAllCaptures="false"> </conditions> <action type="Redirect" url="https://mail.example.com:8000" appendQueryString="false" logRewrittenUrl="true" /> </rule> Thanks

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• I need to sell an almost-complete MMORPG project. How can I do that?

  - by Tomasz

  I need your help. We have to sell MMORPG at an advanced stage. The game has a unique engine, written on the need for the game, graphics, sound, map editor, web site etc. As it happens in the play mmorpg we can develop the characters, monsters. We can fight with other characters or to establish cooperation in solving the challenges. We can fight using own monsters, or throwing their own cards with spells. Unfortunately we have no idea how to promote the game. Ended fund and I think the whole team surrendered. How can I find a buyer? Where can I find him? Thank you for your help.

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• MySQL vs. SQL Server Go daddy, What is the difference bewteen hosted DB and App_Data Db

  - by Nate Gates

  I'm using Goddady for site hosting, and I'm currently using MySQL, because there are less limits on size,etc. My question is what is the difference between using a hosted Godaddy Db such as MySQL vs. creating a SQL Serverdatabase in the the App_Data folder? My guess is security? Would it be a bad idea to use a SQL ServerDB thats located in the App_Data folder? Additional Well I am able to create a .mdf (SQL Server DB file) in the App_Data folder, but I'm really unsure if should use that or not, If I did use it it would simplify using some of the Microsoft tools. Like I said my guess is that it would be less secure, but I don't really know. I know I have a 10gb, file system limit, so I'm assuming my db would have to share that space.

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• Can't use PHP extension Mcrypt in Ubuntu 13.10 (Nginx, PHP-FPM)

  - by Marc-François

  I installed a fresh Ubuntu 13.10 on my laptop. Like I usually do, I install the packages I need for Web development, which are nginx, php5-fpm, mysql, php5-mysql, php5-mcrypt and a few others. After editing some configuration files, this usually works. But today, since 13.10, an error appears instead of the Web page I expected. Laravel requires the Mcrypt PHP extension. The package php5-mcrypt has been installed and reinstalled. The command php -m doesn't seem to show mcrypt. Any idea where the problem could come from? I've done this setup many times and it always worked.

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• Installing netcdf c++ interface on ubuntu 12.04.1 LTS

  - by iluvatar

  I am using a code which employs the modern netcdf c++ interface (netcdf namespace, include file is called just netcdf without .h or similar, ncFile class, etc) and have just switched to ubuntu 12.04.1 LTS. I installed netcdf and libnetcdf6 with apt-get, but I still get the "old" headers in /usr/local/include (netcdf.h, netcdfcpp.h, etc). In Ubuntu, the library version for netcdf is 4.1.1, while at my own computer with Mac Os X (where I have the right netcdf include file) the version is 4.2.1.1 . I cannot modify the source code I am using. I would like to know if there is a way to upgrade the netcdf library on ubuntu to support the modern c++ ointerface, or, if I have to manually compile it, if you think that using src2pkg is a good idea. This is my first experience with Ubuntu. Thanks in advance.

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• How should I invoke a physics engine?

  - by ymfoi

  I'm new to writing games. I'm planning to write a 2D battle game which may require an physics engine. Suppose I've written one, but how can I combine it with the main routine of my game? Should I attach it directly to the graphics render routine or put it in an individual thread? I've spent much time looking for some common approach, but found nothing. So can you reveal some basics idea for me, a newbie? Thanks! P.S. There're many other problems I have to deal with if I choose to start a separate thread for the physics engine, for example, the lock problem, while from my intuition, I guess I'd better separate the render and the physics engine.

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• Worst coding standard you've ever had to follow?

  - by finnw

  Have you ever had to work to coding standards that: Greatly decreased your productivity? Were originally included for good reasons but were kept long after the original concern became irrelevant? Were in a list so long that it was impossible to remember them all? Made you think the author was just trying to leave their mark rather than encouraging good coding practice? You had no idea why they were included? If so, what is your least favourite rule and why? Some examples here

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