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  • Without using a pre-built physics engine, how can I implement 3-D collision detection from scratch?

    - by Andy Harglesis
    I want to tackle some basic 3-D collision detection and was wondering how engines handle this and give you a pretty interface and make it so easy ... I want to do it all myself, however. 2-D collision detection is extremely simple and can be done multiple ways that even beginner programmers could think up: 1.When the pixels touch; 2.when a rectangle range is exceeded; 3.when a pixel object is detected near another one in a pixel-based rendering engine. But 3-D is different with one dimension, but complex in many more so ... what are the general, basic understanding/examples on how 3-D collision detection can be implemented? Think two shaded, OpenGL cubes that are moved next to each other with a simple OpenGL rendering context and keyboard events.

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  • How to install Syngen?

    - by inLoveWithPython
    I'm using Ubuntu 12.04. I found out that there is a near-obsolete program based on the obsolete Caml Special Light by someone at INRIA ( ftp.inria.fr, directory lang/caml-light ). The program is called Syngen. I need it to create Syntax diagrams. But i am not able to run the binaries that come with it, and i'm not able to compile the source because it needs a compiler called cmlc. Somebody help, i find REALLY less documentation about this in internet.

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  • How to Create a Website From Scratch and How to Promote It

    Many people think that they can just make a website upload it to their server and people will visit, this of course is not correct, it is the main reason people fail at making an income online just taking the time to fully research your market can be the difference between success and failure. Choosing your niche and researching your keywords takes time and if done wrong it will be a sure way to failure it is the most important part of building your web site and should be done before buying your domain name and web space, search...

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  • Getting my younger brother started on programming

    - by SmartLemon
    My younger brother is 13 years old, I started programming when I started to develop Android applications when I was 15, last year my brother gained an interest in it and he would always pestering me about letting him make something himself, so I wrote him a few tutorials and he built himself a small application that had a few buttons that did something, I think you put in your dob and it would tell you what day you were born on, he took a couple of days building up to his final application, maybe even a week, learning everything he needed. Since then he hasn't really done much more because I have been engulfed in work and such where I have my own programming problems to sort out. I told him that when he was my age (I am 17) that he should be better then me, he was a bit sceptical about this however. I dont think he has as much logical reasoning as I would think he needs to solve more complex problems, but shouldnt that just develop over time as it did with me? He has been pestering me for the past week or something to write him more tutorials, but I didn't have time. All I had with me was a playlist I had downloaded from the new boston from youtube for C++, it's about 73 videos. He is currently about 20-30 videos in, he has come to ask me a few questions about it and thats it. Should I have really properly started him with C++? Should I stop him now and start him again on python or ruby? I know that C++ shouldn't really be a beginners language, especially for someone who is only 13, by the time this question is answered will probably be up to learning about inheritance or something. Some people may see this as not a real question, but it is, and should be used as a reference for others. I want to know, should I start him on a different language whch is more easy? What language then? And would it be better for me to teach him myself (I would make time) or just continue him with the new boston? There are a few more questions throughout this question but these are the main ones. Part of the question people seem to be neglecting is me asking whether I should change what language he is learning to another, or since he is already pretty far through the tutorials should I just leave him with C++ and he can learn the other languages freely by himself?

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  • How to track users who access an app three times a week in Google Analytics

    - by exceptionerror
    I have an IOS app that is being tracked, and I'm looking to find unique users who use the app 3 or more times a week. I am able to find users who logged three sessions in a particular week, but I'd like to find users who log three sessions every week since a given start period. Similarly, I'd like to find the number of users who use the app 1 time a week and one and 1 time a month. Is this possible through Google Analytics?

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  • How do you refer to the user using the application vs. the user being edited? [closed]

    - by Roman Royter
    Suppose you are developing an administration page where the administrator can edit other users. In your code you want to distinguish between the user sitting in front of the screen, and the user being edited. What do you call the two? User, CurrentUser, EditedUser, CurrentEditUser, etc? Note that the admin user isn't necessarily real admin, they can be just an ordinary user given rights to edit other users.

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  • iptables change destination address base on result from mysql

    - by user1812225
    I need to change destination address of tcp/ip packets based on result of execution mysql query... SELECT `score` FROM `reputation` WHERE `ip` = packet.source_ip if (score < a) then packet.destination_ip = ... else packet.destination_ip = ... What ways of solving this problem do you see? Thanks. P.S. this is important that destination host knows REAL ip address where packet came from, not IP address of firewall.

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  • Moving multiple objects on a map

    - by Dave
    I have multiple objects on my isometric game, for example, NPC's doing path finding automatically to walk around the map. Now there could be any number of them from 0 to infinity (hypthetical as no PC could handle that). My question is: is simply looping each one individually the smartest way to animate them all? Surely as the number of units increases you will notice a lag occuring on units near the end of loop still "waiting" for their next animation movement. The alternative is a swarm algorithm to move all objects together. Is that a smarter idea or do both situations apply depending on the circumstances of the game?

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  • T-SQL Tuesday #34: HELP!

    - by merrillaldrich
    I owe my career to the SQL Server community, specifically the Internet SQL Server community, so this month’s T-SQL Tuesday is especially poignant. I changed careers “cold” about eight years ago, and, while I had some educational background in computer science, I had relatively little real-world DBA experience. Someone gave me a shot in the form of an entry level job, for which I am grateful, but I also had to make the argument to him that I would figure out whatever I needed to do to be successful...(read more)

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  • DevWeek & SQL Server DevCon 2011

    The 14th annual DevWeek conference takes place from 14-18 March 2011, at the Barbican Centre in central London, and once again incorporates two dedicated tracks on SQL Server, alongside seven concurrent tracks aimed at software developers. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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  • Tell us what you want in 6.6

    - by Reggie
    Now that we have finished 6.5 it's time to really start gearing up for 6.6.  We have  many great feature ideas but we want to hear from you.  To help with that, we're running a poll on the website where you can vote on the features you would like to see in the next version of the best MySQL ADO.Net Connector on the planet.  You can find the poll at http://dev.mysql.com and scrolling near the bottom of the page.   Thanks for your time and please go vote.  

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  • How do I revert the Plymouth theme back to default after purging Kubuntu?

    - by Pezhman Karimeh
    I recently installed the KDE Kubuntu desktop but after somehow working with i decided to use pure GNOME Ubuntu desktop again.I remove Kubuntu desktop and its packages completely but Kubuntu background image still running at time of booting the system and shutting down it. I tried the steps below at terminal , it made the shutting down background image correct but still the background image of booting time is kubuntu image. sudo update-alternatives --set default.plymouth /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth How could i change this image to the default Ubuntu image too?

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  • Fedora, Mozilla, and trademarks

    <b>LWN.net:</b> "Trademarks and free software can make a volatile mix. It is understandable that a project would want to ensure that code shipping under its name is "the real McCoy", but modifying the source and distributing the result is a hallmark of free software."

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  • Should debug code be left in place, always, or added only when debugging and removed when the bug has been found?

    - by gablin
    I, for one, only add debug code (such as print statements) when I'm trying to locate a bug. And once I've found it, I remove the debug code (and add a test case which specifically tests for that bug). I feel that it's cluttering the real code and therefore has no place there unless I'm debugging. How do you do it? Do you leave the debug code in place, or remove it when obsolete (which may be difficult to judge when that is)?

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  • Today's Guide to Linux Virtualization

    <b>Linux.com:</b> "There's no question about whether to deploy virtualization; the real question is what virtualization solutions to look at and what workloads to virtualize. We'll help cut through the complexity and help set the options straight."

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  • Online Press Releases Essential For Non-Profits

    An online Press Release has become a powerful tool to convey your message to a large and dispersed target audience. Where advertising serves as a form of direct self-promotion, a Press Release serves the same purpose but in a more subtle and informative manner. A PR for your non-profit should be used judiciously, when there is real newsworthy content to disseminate.

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  • windows 7 virtual wireless adapter keeps going to sleep

    - by conners
    Just a quick question that I can't see mentioned anywhere online. I have a Windows 7 box configured like these guys recommend http://www.itgeekdiary.com/windows-7-as-an-wi-fi-access-point/ simply so that I can have my Windows 7 box as a wifi access point or a wifi emitter. It's also called a Microsoft Virtual WiFi Miniport Adapter. But it powers off and shuts down automatically and stops working. Basically everything works as intended and then - well -it will stopped working when I am not at the Windows 7 PC for a long time. The problem seems to be that every time my PC goes to "power save / sleep" and in the morning the Windows 7 machine "wakes" but blooming heck the wifi has stopped and you have to power cycle the PC (which is very uncool). When I power Cycle I have to do the following as administrator C:\Windows\System32\netsh.exe wlan start hostednetwork I then tried a gazllion things involving services and power management and eventually discovered that if I run the following commands as administrator it will be ok (for a bit) but every 3rd ot 4th time I try this "trick" it simply fails. the trick that seems to work 3 out of 4 times (i.e. "most" of the time) C:\Windows\System32\netsh.exe wlan stop hostednetwork C:\Windows\System32\netsh.exe wlan start hostednetwork But why does this only work "some" of the time? What else I did by myself: on every manage adapter properties (that relates to the wifi) I right clicked [configure] [power management] /disabled/ "allow the computer to power off to save power" <- this made no difference Also (and this is a bit annoying) there is no system tray app/GUI for the Microsoft Virtual WiFi Miniport Adapter output signal ... none... so (lame as it sounds) the ONLY way I can check if it's on is to physically go to another device and SCAN.. lame so my question can probably be solved by any of the following: a) can I stop Windows 7 sleeping this wifi when the machine sleeps b) can I force Windows to force wake this process on wake? if so how? c) what is the service / process REALLY called and how do I restart it if it crashes d) how can I flush the wifi properly rather power cycle the host machine e) anyone have a link to an program or app that can sit in the system tray that shows windows 7 wifi hotspot emission status (on/off/etc etc) Since I am a programmer I can easily write a vbs script / windows exe to fix this (and I will share this solution) and the gui problem if I can work out the actual service that is running that netsh stops/starts

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  • Estimates, constraint and design [closed]

    - by user65964
    For your next two software projects (assuming that you're getting programming assignments, otherwise consider the program to find the min and max of a set of rational numbers) estimate how much effort they would take before doing them, then keep track of the actual time spent. How accurate were your estimates? State the requirements, constraint, design, estimate (your original estimate and the actual time it took), implementation (conventions used, implement/test path followed.

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  • Facing quality issues

    - by juststartedmycareer
    A workforce management software has complex GUI (for example values in a page depends on the status (closed or open) of other pages). Only latest and near past development has test coverage. During our last release, we received lots of bugs from customer in-spite of 2 weeks of testing Sprint . We don't have dedicated test team. The developers does the unit test & User acceptance test. Every day triggers automated regression test. I am afraid the developers are not testing the entire workflow because its time consuming also not able to automate it because of its complexity. Any suggestions ?. The legacy code (15 yrs development) has less code coverage. How can I improve quality ? Note: Now not possible to hire testers to have independent test team!!

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  • Which Provides a better Foundation Java or .Net (C#, ASP.NET)?

    - by Deadlocked_Thread
    I am not asking this question to start arguments (people often consider Java and .Net as religions) but which provides a better foundation and helps to gain real programming skills (of Computer Science and Web Development), I have worked with ASP.NET and C# but most of my time spends on Dragging and Dropping i am a C++ programmer and Drag and Drop irritates me.I haven't tried Java so i want to ask is Java also like .Net family (Drag and Drop)?

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  • Resize/Create a New Partition in GParted

    - by Charlie
    So I've been having some trouble recently with Ubuntu and decided it was time to switch to windows. But I have no ntfs partitions on my hard disk and GParted will not let me resize my one large partition (/dev/sda1) so that I can allocate some ntfs space to install windows on. Any help would be greatly appreciated, I've had this problem for quite some time now and it had just become one big headache. Thanks in advance!

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  • Targeting a vehicle with complex movement?

    - by e100
    Targeting a vehicle with known constant velocity is simple, and collision is guaranteed. Imprecise AI can be modeled by adding a small error factor. But how would one go about targeting a vehicle whose movements are more complex? Perhaps it's evading the AI or another game object. I've been thinking about how I'd do it myself in a FPS (in which bullets have finite speed) and think there might need to be at least couple of targeting modes based on the target's movement in the previous second or so: If it's near linear (peak acceleration in a certain range) target with the linear model If it's highly irregular (perhaps size of bounding box of recent positions could be used?) , target at an average For now I can assume 2d space, AI is stationary and projectile moves linearly.

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  • android game: how to approach mutliplayer

    - by willmer
    I'm making a single player game that is near completion, and I am already starting to think about giving the game multiplayer. The multiplayer would basically be finding someone to play against, likely in a waiting room or just have a match-making function, and then having a pokemon style battle between the people in real time. I think it would be relatively simple as I'm just sending information about each attack(move chosen and damage) and what it did back and forth, but I'm not sure what resources to consult for this. I am very new to Android/Java development and really just learning as I go. I have heard a bit about Skiller, but I'm still unfamiliar with using other SDK's and how easy it may be. Does anyone have any suggestions as to what SDK's or methods for accomplishing this. I currently have no money to spend on software development, but I'd like to get started on learning how to do this.

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