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From simple physics with a ball, to a more complicated shape

- by Maximus

Hello fellow game devs and stack overflowers... I recently made a transition from OpenGL ES 1.1 to 2.0 (on Android via NDK) and things are going well so far. I'm working on doing a dice rolling application (gaming dice up to 20 sided, not just regular 6 sided die) as a way to learn more about how physics is implemented in a gaming environment. I've explored implementing existing engine options (such as Bullet) and I don't think I need to implement something quite so sophisticated. I've found several tutorials that handle a lot of the general physics involved with initial trajectory, velocity, angle of contact and reflection angle, etc. I'm confident that I'd be able to implement ball-like behavior without much trouble. My question lies in when I attempt to make the interaction of the die shape with another surface more "realistic," for example... the die strikes the floor surface at such an angle where only one corner makes contact with the floor. In my mind, the center of gravity of the object would play a part in determining how the die bounces away, possibly even spinning it it faster, etc... but I am not sure what the actual math involved is. Are there any recommended resources for getting into this level of detail? Initial searches haven't turned up much... Thanks to everyone in the community, -Jeremiah

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Koans, now available in Python flavor

- by Greg Malcolm

Recently a Python developer friend with whom I was pair programming with suggested that I show him how to write a little Ruby. I responded by telling him to check out Ruby Koans as a starting point. However I wanted to try that in reverse at the same time with me learning some Python. I did a bit of googling, and sure enough someone had started writing some Python Koans. It just needed finishing... So, a few weeks later Python Koans is now complete and ready for action! It is available through Mercurial on Bitbucket: http://bitbucket.org/gregmalcolm/python_koans/wiki/Home It is also mirrored on Github: http://wiki.github.com/gregmalcolm/python_koans/ Converting it was fairly easy. Aside from the differing philosophical approaches behind the two languages, Ruby and Python are fairly similar. We had to come up with completely new material for a few subjects like multiple inheritance and decorators, but for most features in Ruby there is something roughly comparable in Python. I highly recommend writing tests (or koans) as a means to lean a new language or framework. I've learned a lot from doing this.

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Mac OS X - Quickly change voices for Text-to-Speech

- by Roman Geber

I love the text to Speech feature of Mac OS X. Since I'm not a native English speaker I'm very happy about all the additional languages added since Lion came out. However, I do use English as well as my native language (German). Changing voices is a bit of a pain. It just requires too many steps to be comfortable. Is there any way to make this easy? I was looking for shortcuts, maybe a drop down menu somwhere up in the right corner, anything would be fine. Since my search was not successful, I hope to find some advice here on SuperUser. Thanks a lot! cu Roman

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Basic clarification about Limited FTP/sFTP users

- by mattewre

I would like to get some clarification about the correct way to create limited users to access to my VPS user as WEBSERVER with Nginix. I'm used to NOT install FTP and access via SFTP only. It is ok for every set up? this is what I usually do from to create a limited user called "admin" that should be able to have access via SFTP to the folder with the website data mkdir -p /var/www/mysite.com/ adduser admin adduser admin www-data chown -R root:root /var/www chmod -R 755 /var/www chmod -R 755 /var/www/mysite.com chown -R admin:www-data /var/www/mysite.com/ It seems not to be the correct way, I always have problems with permission when I upload some files (for example with Wordpress in general). I would like to create an user that does work exactly as the one that the "provides" give to their client when they buy an Hosting service (that is a FTP, I would prefer SFTP access). It is for personal user, but I think that a limited user is a lot safer to use then the "root" via SFTP.

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IIM Calcutta – EPBM 14 – Campus Visit – Day 2 – IS_Strategy and Internationa

- by Ram Shankar Yadav

Hey Guys~ So the second day of the week starts, and we were all set for coming sessions on : - IS & Strategy and, - Changing Geo-politics & Business Environment We did our daily chores, rushed for breakfast, and reached Auditorioum, almost on time. IS & Strategy session was quite informative and interactive, and the prof. gave lot of examples, and it really gives us solid understanding by relating things with examples. Then goes the lunch, but the IS session over shoot for 15 minutes so our idea of taking a nap in lunch was not working out, but anyway we did our lunch and tried to sleep for 10-15 minutes. We got back and session on International Business started. Frankly, it’s a great topic, but we had tough time to be attentive, and it was hard to keep ourselves awake :P Anyhow the session came to an end, and we went to Library, and roamed around campus. Got back, had dinner, and went for a night walk, and ice-cream party. Lastly we did went to the platform inside the lake, and had a gag session, got back and did “ITC eChaupal” case study. We have planned to visit Kali Mandir tomorrow, so I’ve to sleep for few hours…GN! Stay tuned for more… ram :)

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Mouse wheel speed, a permanent solution?

- by Logan

I would like to address an issue that has been around for a while now. The wireless mouse's wheel speed is abnormally fast on Ubuntu (as well as Mac Osx, as I have read) and the way to fix this temporarily is to unplug and plug the wireless adapter. A solution for this have been asked for in various forum topics on Ubuntu forums and also askubuntu. However the best solution for this is to re-plug the wireless adapter for the mouse. This fixes the mouse wheel speed until the next reboot. My question is, what can be done to make this permanent? Can a shell script be written, or firstly what can be causing this? If you could give me some ideas on why this problem is occurring I would happily write a shell script for it... (I am thinking if this is fixed by a simple re-plug of the adapter, maybe a shell script to disable device and re-enable it or something like that... could do the trick) I appreciate any discussions and ideas on the subjects. Here are some already discussed topics on the same subject that I've researched: Mouse wheel jumpy on scrolling Mouse wheel scrolling too fast There's a lot more than that on the net, all of them ends with re-plug solution.

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An Oracle's Interns Story by Samarth Varshney

- by user769227

I have written a short write-up about my experience at Oracle and am attaching some pics along: I joined Oracle on 5th January 2011 as part of my internship program in BITS Pilani Goa Campus. In the short period of six months, I had the most beautiful and interesting time of my life. It was fun to work in Oracle, thanks to the whole team. I had an excellent manager, simple and sophisticated, who gave me the utmost enthusiasm to work. I gained a lot of knowledge during my internship, thanks to my colleagues. They were very helpful and motivated us (interns) in every possible way. In the initial stages of work, in which you know almost nothing, they helped me gain knowledge at a rapid speed. Thanks to the vast database of study material at the Oracle site, that I could start on with my project in a very short time. For me, the time flew like anything and made the 6 months look like a few days. It was probably due to the team, that the work was so much fun. We had our deadlines but had full freedom as to how to work and when to work. I don't remember a single instance, in which I was working and not listening to songs. I mean it will always be a time to remember. I hope to join this company and make this time last forever. Samarth

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Outlook 2007 GAL Phone List

- by s15199d

I just spent a lot of time populating Phone Numbers and Fax Numbers in our GAL/Active Directory. The goal of which was to replace our static *.xlsx file that we use as a corporate phone directory. I know I can see the GAL by clicking on the To... button, and I can see more specific info for a particular user, by adding them as a recipient and double-clicking their name in the To: field. Is there any way (inside Outlook) to have a laundry-list view of all users and phone/fax/mobile/address similar to the phone list view for contacts? Are there any other tools that might provide this functionality. I've used a GAL web interface before, but that cost $ and as I recall was challenging to manage.

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Efficient coding in Visual Studio (or another IDE), with touch typing

- by cheeesus

Moving the cursor to another position in code is one of the most frequent actions when coding. I don't write my programs from the beginning to the end, like a letter. However, moving the cursor requires me to move my right hand to the key arrows or to the mouse, which feels like an interruption to my writing rhythm, since I'm using touch typing. I want my hands to rest on the keyboard. It's difficult to explain what I mean, but I think every coder using touch typing knows what I mean. I tried many things, like defining some shortcuts as surrogate arrow keys (Shift+Alt+J, K, L, I), or buying a keyboard with a Trackpoint, Trackpad, or Trackball on it, but I have not yet found a satisfying solution to the problem. What is the best solution you know of, regardless of which IDE you use? Edit: Thank you for your answers. I am using a lot of shortkeys, but I think using a Vim plugin in Visual Studio would interfere too much with the shortkeys I am used to. Also, I have a keyboard with a built-in mouse, but I'm still looking for a better solution.

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What's so bad about pointers in C++?

- by Martin Beckett

To continue the discussion in Why are pointers not recommended when coding with C++ Suppose you have a class that encapsulates objects which need some initialisation to be valid - like a network socket. // Blah manages some data and transmits it over a socket class socket; // forward declaration, so nice weak linkage. class blah { ... stuff TcpSocket *socket; } ~blah { // TcpSocket dtor handles disconnect delete socket; // or better, wrap it in a smart pointer } The ctor ensures that socket is marked NULL, then later in the code when I have the information to initialise the object. // initialising blah if ( !socket ) { // I know socket hasn't been created/connected // create it in a known initialised state and handle any errors // RAII is a good thing ! socket = new TcpSocket(ip,port); } // and when i actually need to use it if (socket) { // if socket exists then it must be connected and valid } This seems better than having the socket on the stack, having it created in some 'pending' state at program start and then having to continually check some isOK() or isConnected() function before every use. Additionally if TcpSocket ctor throws an exception it's a lot easier to handle at the point a Tcp connection is made rather than at program start. Obviously the socket is just an example, but I'm having a hard time thinking of when an encapsulated object with any sort of internal state shouldn't be created and initialised with new.

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About can't export the performance problems.

- by kyrathy

At first,let me describe my environment My VirtualCenter is install on window 2008 ,and theDataBase that VC used is SQL 2008 I really want to ask is ..... When I use vsphere clinet to connect VC.....I got a problem. the performance chart only can show "realtime "...... whatever I only want to view the chart , or I want to export the performance log . when i manually want to export performance, and I select the time to 1 hour ,1 day ,1 month, or from a to b. it showed "No performance data to report for selected objects" only select realtime can export data normally. Before I install Vsphere 4 , I install the SQL 2008 , used the schema in the install CD(I follow the step to create SQL DB for vSphere) Could anybody help me how to solve this problem? And if need any information ,just tell me to provide. Thanks a lot.

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amazon aws, rds

- by b0x0rz

just need a quick info on two questions but very related. 1 if we use rds on amazon aws, what happens if some of the machines rds is running on crash? i mean what happens with the data? is it gone? 2 if we use rds on amazon aws via beanstalk, and decide to stop them is the database gone, i mean data, is it gone? thnx a lot, simple yes/no will do, but if you can give more info or a solution to mitigate these issues if any of the answers is unfavorable, that would be great.

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Why is my CPU fan so loud?

- by tiiquu

I bought an old PC to use as a second PC. Everything is fine, except for one thing. The CPU fan is terribly loud! I did a lot with PCs but I never did much with CPU fans. If I want to replace it, what do I have to look for? The fan is 8cm long on each side and 11cm diameter. It is just clipped to the cooler. The PC is a P4 3 GHz. I don't want to spend much money, as I only paid 50 euro for the whole PC. I would prefer to buy a fan for 1-3 dollar or something at eBay but I am not quite sure which one I should buy (which fits). Can you advise?

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Usage of repository between EF model and code consumer

- by jim

I have binary data in my database that I'll have to convert to bitmap at some point. I was thinking whether or not it's appropriate to use a repository and do it there. My consumer, which is a presentation layer, will use this repository. For example: // This is a class I created for modeling the item as is. public class RealItem { public string Name { get; set; } public Bitmap Image { get; set; } } public abstract class BaseRepository { //using Unity (http://unity.codeplex.com) to inject the dependancy of entity context. [Dependency] public Context { get; set; } } public calss ItemRepository : BaseRepository { public List<Items> Select() { IEnumerable<Items> items = from item in Context.Items select item; List<RealItem> lst = new List<RealItem>(); foreach(itm in items) { MemoryStream stream = new MemoryStream(itm.Image); Bitmap image = (Bitmap)Image.FromStream(stream); RealItem ritem = new RealItem{ Name=item.Name, Image=image }; lst.Add(ritem); } return lst; } } Is this a correct way to use the repository pattern? I'm learning this pattern and I've seen a lot of examples online that are using a repository but when I looked at their source code... for example: public IQueryable<object> Select { return from q in base.Context select q; } as you can see no behavior is added to the system by their approach, so I was confused that maybe repository is something else and I got it all wrong. At the end there should be extra benifits of using them right?

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Customize Colors for Sprites in Web Game

- by NateDSaint

So I'm working on an html5/javascript/css3-based game. Without going into too much detail, I'm thinking of having the characters be simple 8 or 16-bit style sprites, but I'd like to allow the user to customize the colors of their character. Here are some examples of what I'm talking about : http://jsfiddle.net/simurai/CGmCe/light/ http://www.splashnology.com/article/sprite-animation-in-css3/1485/ So the problem I'm having is two-fold: 1) Should I use something other than a sprite map for my characters, like actually draw them as shapes and animate them in a canvas element? That way I can fill the sprite with colors of the user's choosing? My fear there is that this would be inefficient as far as resources and also waste a lot of time hand-drawing everything, but could allow other customization (like height/width etc). 2) Are there potentially some web apis that would allow you to alter colors inside of a sprite? I suppose I could do it on the back-end with GD, but I'm trying to make it entirely in-browser (including local storage). It's not a definitive one-answer only question, but I'm hoping someone can suggest something they've seen that approaches the same problem from another angle or gives us a way to customize the sprites or manipulate them in some manner. Or avoid them altogether, and use a different method.

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Linux stretch cluster: MD replication, DRBD or Veritas?

- by PieterB

For the moment there's a lot of choices for setting up a Linux cluster. For cluster manager: you can use Red Hat Cluster manager, Pacemaker or Veritas Cluster Server. The first one has the most momentum, the second one comes by default with RH subscriptions and the last one is very expensive and has a very good reputation ;-) For storage: - You can replicate LUN's using software raid / md device - You can use the network using DRBD replication, which offers a bit more flexibility - You can use Veritas Storage Foundation technology to talk to your SANs replication technology. Anyone has any recommandations or experience with these technologies?

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How to reduce the fan noise and how to increase battery life?

- by mehdi

I have a brand new Sony Vaio S series laptop.(VPCSA2DGX) It came factory installed with Windows 7 professional Edition 64bit. Runs Intel core i5, 500 GB HDD , 4GB Ram. First I installed ubuntu 11.10 64 bit along side Windows to dual boot. Later,since the problem did not solve, I installed ubuntu 12.04 64bit along side Windows to dual boot. However the problem keeps annoying me. Problem: When running ubuntu 11.10/12.04, the battery lasts only about 1.5 hours. The Fan runs loud and continuously. And there is a lot of heat generated. System monitor shows less than 5% CPU used. My laptop enjoys hybrid graphic and I tried turning off ADM graphic card and keep Intel graphic card on. However I can not get the Fan noise or heat to go away and consequently the battery drain continues. BTW, in windows, the laptop gives 4-5 hours of battery power, Fan is silent and there is no heat problem. Any ideas on how to reduce the fan noise and how to increase battery life in ubuntu 11.10/12.04?

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How to view bad blocks on mounted ext3 filesystem?

- by Basilevs

I've ran fsck -c on the (unmounted) partition in question a while ago. The process was unattended and results were not stored anywhere (except badblock inode). Now I'd like to get badblock information to know if there are any problems with the harddrive. Unfortunately, partition is used in the production system and can't be unmounted. I see two ways to get what I want: Run badblocks in read-only mode. This will probably take a lot of time and cause unnecessary bruden on the system. Somehow extract information about badblocks from the filesystem iteself. How can I view known badblocks registered in mounted filesystem?

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MySQL Database synchronizing with local and remote with c#

- by Neo

I've posted this here as its more of a mysql questions than c#, I have written some software that runs a local instance of mysql when it first starts, now once mysql is up I would like to synchronize the data between the remote database table and the local database table that the software runs (it shouldn't sync any other databases / tables as there are a lot). I have replication setup to synchronize the entire database to another server which works unless the server goes down then it never comes back up, so based on that I don't think replication will work as when the software is closed it also closes MySQL. So what would be the best method of synchronizing the remote and local databases?

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Semantic Versioning and splitting apart a library, providing a bundled build

- by Derick Bailey

I've got a nice, fairly popular JavaScript library that is following Semantic Versioning. The current library has a few dependency libraries, which are available either as separate downloads or as part of a single bundled download. I see a need to head down this path further. I want to extract additional, smaller libraries out of the one larger library. Each of these extracted libraries would be available as separate files, or inside of the one bundled build, again. If I go down this path of extracting the libraries, and providing a bundled version of the final code, does this require a full version change in semantic versioning? Would I have to bump from 1.x to 2.x? My first thought it no: I will not change any public API, so I don't have to change the major version number. But then I wonder... well, I am restructuring a lot of things, even though the final API for the bundled version would be the same. Is there a clear answer from semver on something like this? Do I need to bump first, second or third dot? Or something else?

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Hotspotting - tying Visualization into Other applications

- by warren.baird

AutoVue 20 included our first step towards providing a rich hotspotting capability that will allow visualization capabilities to be very tightly integrated into a wide range of applications. The idea is to have a close link between the visual representation of an object or place, and the business objects associated with that object or place. We've been working with our partner Enigma to enable this capability in their parts catalogue - the screenshot above shows what it looks like - the image on the right is a trimmed down version of AutoVue displaying a drawing of the various parts in an interactive way - when you click on item '6' in the AutoVue drawing, the appropriate item is highlighted in the parts catalogue - making it easy to select the parts you need, and to ensure that the correct parts are selected. The integration works in both directions - when you select a part in the part catalogue, the appropriate part is highlighted in the drawing as well. To get slightly technical for a moment, this is a simple javascript integration - the external application provides a javascript callback that AutoVue calls whenever an item is clicked on, and AutoVue provides a javascript function to call when an item is selected in the external application. There are also direct java APIs available. This makes it easy to tie AutoVue into many types of applications - you can imagine in an asset lifecycle management application being able to click on the appropriate asset in a drawing to create a work-order, instead of finding the right asset ID to enter. Or being able to click on a part or sub-assembly to trigger a change order in a product lifecycle management application. We're pretty excited about the possibilities that this capability opens up, and plan on expanding on it a lot in the future. Would this be useful in your enterprise applications? What kinds of integrations like this would be useful for you? Let us know in the comments below!

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What should I learn that I missed by not going to school?

- by BinaryMuse

I'm a software engineer at a local university, and I feel I'm able to competently do my job, but recently I've been interested in "filling in" the gaps in my knowledge. I suspect I would have learned some of this in school; for example, I don't have a lot of knowledge of sorting algorithms (something I feel is pretty common in college). So, what knowledge am I likely missing by not going to college that I could study on my own? Bonus points for listing resources that might put me on the right track! Some background: I've programmed in PHP, Java, and Ruby (more seriously in Java and Ruby than PHP); I have some experience with C/C++, though my workload doesn't really lend itself to those languages; I work mostly (recently) with the web, using frameworks such as CakePHP and Rails. I'm familiar with SQL (though probably not with some of the theory). Note: The university I work for has no technical classes, so taking courses on the university's dime is a great idea but not possible for me. :)

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Creating an expandable, cross-platform compatible program "core".

- by Thomas Clayson

Hi there. Basically the brief is relatively simple. We need to create a program core. An engine that will power all sorts of programs with a large number of distinct potential applications and deployments. The core will be an analytics and algorithmic processor which will essentially take user-specific input and output scenarios based on the information it gets, whilst recording this information for reporting. It needs to be cross platform compatible. Something that can have platform specific layers put on top which can interface with the core. It also needs to be able to be expandable, for instance, modular with developers being able to write "add-ons" or "extensions" which can alter the function of the end program and can use the core to its full extent. (For instance, a good example of what I'm looking to create is a browser. It has its main core, the web-kit engine, for instance, and then on top of this is has a platform-specific GUI and can also have add-ons and extensions which can change the behavior of the program.) Our problem is that the extensions need to interface directly with the main core and expand/alter that functionality rather than the platform specific "layer". So, given that I have no experience in this whatsoever (I have a PHP background and recently objective-c), where should I start, and is there any knowledge/wisdom you can impart on me please? Thanks for all the help and advice you can give me. :) If you need any more explanation just ask. At the moment its in the very early stages of development, so we're just researching all possible routes of development. Thanks a lot

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Given a database table where multiple rows have the same values and only the most recent record is to be returned

- by Jim Lahman

I have a table where there are multiple records with the same value but varying creation dates. A sample of the database columns is shown here: 1: select lot_num, to_char(creation_dts,'DD-MON-YYYY HH24:MI:SS') as creation_date 2: from coil_setup 3: order by lot_num LOT_NUM CREATION_DATE ------------------------------ -------------------- 1435718.002 24-NOV-2010 11:45:54 1440026.002 17-NOV-2010 06:50:16 1440026.002 08-NOV-2010 23:28:24 1526564.002 01-DEC-2010 13:14:04 1526564.002 08-NOV-2010 22:39:01 1526564.002 01-NOV-2010 17:04:30 1605920.003 29-DEC-2010 10:01:24 1945352.003 14-DEC-2010 01:50:37 1945352.003 09-DEC-2010 04:44:22 1952718.002 25-OCT-2010 09:33:19 1953866.002 20-OCT-2010 18:38:31 1953866.002 18-OCT-2010 16:15:25 Notice that there are multiple instances of of the same lot number as shown in bold. To only return the most recent instance, issue this SQL statement: 1: select lot_num, to_char(creation_date,'DD-MON-YYYY HH24:MI:SS') as creation_date 2: from 3: ( 4: select rownum r, lot_num, max(creation_dts) as creation_date 5: from coil_setup group by rownum, lot_num 6: order by lot_num 7: ) 8: where r < 100 LOT_NUM CREATION_DATE ------------------------------ -------------------- 2019416.002 01-JUL-2010 00:01:24 2022336.003 06-OCT-2010 15:25:01 2067230.002 01-JUL-2010 00:36:48 2093114.003 02-JUL-2010 20:10:51 2093982.002 02-JUL-2010 14:46:11 2093984.002 02-JUL-2010 14:43:18 2094466.003 02-JUL-2010 20:04:48 2101074.003 11-JUL-2010 09:02:16 2103746.002 02-JUL-2010 15:07:48 2103758.003 11-JUL-2010 09:02:13 2104636.002 02-JUL-2010 15:11:25 2106688.003 02-JUL-2010 13:55:27 2106882.003 02-JUL-2010 13:48:47 2107258.002 02-JUL-2010 12:59:48 2109372.003 02-JUL-2010 20:49:12 2110182.003 02-JUL-2010 19:59:19 2110184.003 02-JUL-2010 20:01:03

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Does it actually matter whether you have open applications when installing new software?

- by Dan

It seems the norm these days is for installers/setup programs to request that you close all open applications before initiating the install process for a piece of new software. I used to obediently follow these directions without fail, even though it could sometimes be frustrating having to close open documents and stop working on things just to get a new, seemingly unrelated application installed. Then at some point I simply stopped bothering. Nowadays if I have a lot of stuff going on I might even run multiple installers at the same time; I can't even recall a time it has ever posed a problem. Why do setup programs even make this request in the first place, then, when it appears to be unnecessary? Is this just to simplify troubleshooting for companies' support people? Has anyone else ever run into problems as a result of trying to install an app while other apps were open?

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