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  • Designing spawning system

    - by Vlad
    I played this game recently http://www.kongregate.com/games/JuicyBeast/knightmare-tower and I am amazed by the way how different monsters are beign spawned. I personally developed my own shooter game and I added time based but also count based spawing system. By count based I mean when there are 5 enemies on stage stop spawning. But this is one example. My question is how are these spawning mechanism built, is there some pattern or some theory how they are built? Are there some online materials/pages where I can improve my knowledge? To sumarize, let just say we have 6 types of monsters. I start the game and kill of monsters of type 1,2 and 3 all the time. Once I pass the first ceiling, like in the game above, monster type 4 appear. ANd so on. As I progress trough the game, the same system of 6 types of monsters stay, but they become more and more resilient and dangerous. So I must also improve to be able to destroy the same monsters but now stronger. My question is simple, are there some theories built or written for developing this type of inteligent systems? Note: This is a general question, not tied up with some game or how exactly should the game work. I am capable to program my own mechanisms but I think I need some help. Thanks.

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  • Proper updating of GeoClipMaps

    - by thr
    I have been working on an implementation of gpu-based geo clip maps, but there is a section of the GPU Gems 2 article that i just can't seem to understand, specifically this paragraph and more precisely the bolded part: The choice of grid size n = 2k-1 has the further advantage that the finer level is never exactly centered with respect to its parent next-coarser level. In other words, it is always offset by 1 grid unit either left or right, as well as either top or bottom (see Figure 2-4), depending on the position of the viewpoint. In fact, it is necessary to allow a finer level to shift while its next-coarser level stays fixed, and therefore the finer level must sometimes be off-center with respect to the next-coarser level. An alternative choice of grid size, such as n = 2k-3, would provide the possibility for exact centering Let's take an example image from the article: My "understanding" of the way the clip maps were update was that you floor the position of the viewpoint to an int, and such get the center vertex point if this is not the same as the previous center point, you update the entire map. Now, this obviously is not the case - but what I am failing to understand is this: If you look at the image above, if the viewpoint was to move one unit to the right, then the inner ring (the one just around the view point + white center square) would end up getting a 1 unit space on both the left and right side of itself. But there is nothing in the paper that deals with this, what i mean is that it would end up looking like this (excuse my crummy cut-and-paste editing of the above image): This is obviously not a valid state of the. So, would the solution be that a clip ring (layer) can only move in increments of the ring/layer it's contained within? Wouldn't this end up being very restrictive? I feel like I am missing some crucial understanding of parts of the algorithm, but I have been over both this paper and the original paper from 2004 and I just can't see what I am not getting.

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  • VPN within a VM to allow for internet access on the host

    - by David Durrant
    I have a network connection (created under Networks and Sharing) that I use to connect to a customer's site. But when I use this to connect to the site, I loose all access to the public internet, and can only access customer specific items. I want to circumvent this issue by creating a VM and then utilizing the VM to connect to the network location and interact within the customer's domain, while leaving my host machine open to the internet. I'm not extremely familiar with networking, but I have a few basic skills. Please let me know if this is possible and what the correct procedures are. I already have a VM created with VirtualBox, and both the host and guest are running Windows 7 x64. I have created duplicate VPNs already, but can only connect successfully on the host machine.

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  • Trouble with SAT style vector projection in C#/XNA

    - by ssb
    Simply put I'm having a hard time working out how to work with XNA's Vector2 types while maintaining spatial considerations. I'm working with separating axis theorem and trying to project vectors onto an arbitrary axis to check if those projections overlap, but the severe lack of XNA-specific help online combined with pseudo code everywhere that omits key parts of the algorithm, googling has left me little help. I'm aware of HOW to project a vector, but the way that I know of doing it involves the two vectors starting from the same point. Particularly here: http://www.metanetsoftware.com/technique/tutorialA.html So let's say I have a simple rectangle, and I store each of its corners in a list of Vector2s. How would I go about projecting that onto an arbitrary axis? The crux of my problem is that taking the dot product of say, a vector2 of (1, 0) and a vector2 of (50, 50) won't get me the dot product I'm looking for.. or will it? Because that (50, 50) won't be the vector of the polygon's vertex but from whatever XNA calculates. It's getting the calculation from the right starting point that's throwing me off. I'm sorry if this is unclear, but my brain is fried from trying to think about this. I need a better understanding of how XNA calculates Vector2s as actual vectors and not just as random points.

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  • Linux: How to break a large file into smaller files?

    - by Runcible
    I have a giant file (20 gigs) sitting on my source machine and I need to transfer it to my target machine. For the purposes of this question, let's assume that I do not have network connectivity between the two machines. I need to break this file into a series of smaller files, write the smaller files to DVD(s), then re-assemble everything on the target machine. Both source and destination machines are Linux boxes. Is there a way to accomplish this using tar? I have a feeling that I need to use the --multi-volume parameter. What are my options? I need to be able to specify the size of the volume files, in order to make sure that each one will fit onto a single DVD. Thanks!

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  • infiniband network between 3 servers

    - by grumpf
    Let's say I have 3 different servers, each one with an infiniband card. Each card has 2 different ports. (I don't know about the model yet) Is it possible to create 3 different networks and to allow the 3 servers to communicate with each other without any problems? (and any spof). I guess I just have to setup the /etc/hosts correctly. I really don't know about infiniband, so please help me :) Thanks in advance. EDIT: Point is to NOT USE a switch!

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  • PHP frameworks - should I use them?

    - by 30secondstosam
    First of all let me explain who I am: I am a PHP Developer working for a company developing their CMS which handles online stores, data feeds and other content like blogs. I have been programming for 6 years and 4 of those have been in PHP. (I used to be a C# developer). My question is regarding PHP frameworks. I see so many jobs asking for zend, cakephp and other MVC types of frameworks. However, even as an experienced developer I have never used a PHP framework. Should I start learning? If so where do I even start as there are so many. I am about to re-write so much of my work's CMS and I'm wondering whether I could help myself a lot by using a framework. What do people think? Considering I will be re-writing a lot of the online store stuff... I am experienced in OO and I have used the .NET framework in the past. Thanks in advance for the replies.

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  • How does trilicense (mpl,gpl,lgpl) work when you want to use it on public website

    - by tomok
    I have tried to search for this answer for quite some time and I have gone through all the various FAQ's and documentation regarding the three licenses; but none of them have been able to answer a question that I have. So I've been working an idea for a website for sometime now and recently I found open source software that has many of components that are similar. It is licensed under the mpl/gpl/lgpl licenses. I think for the most part I understand the ramifications, due to the searches and reading, of what is required if I modify/use and want to distribute the software. But what if I want to modify and not distribute, but use it on a public website that I generate ad revenue from? Is this illegal? It doesn't seem like it is from reading other open source system, say like Drupal, where they allow you to use the software but it's not considered "distribution" if people just go to the website. I know this site may not be the best resource and I've tried some other sites, but I haven't received any clear replies back. If you know some other resource that I could contact also, please let me know. Links for those who don't know: MPL - Wikipedia, Legalese GPL - Wikipedia, Legalese LGPL - Wikipedia, Legalese

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  • How to handle Real Time Data from a database perspective?

    - by balexandre
    I have an idea in mind, but it still confuses me the database area. Imagine that I want to show real time data, and using one of the latest browser technologies (web sockets - even using older browsers) it is very easy to show to all observables (user browser) what everyone is doing. Remy Sharp has an example about the simplicity about this. But I still don't get the database part, how would I feed, let's imagine (using Remy game Tron) that I want to save the path for each connected user in a database and if a client wants to see what is going on with a 5 sec delay, he will see that, not only the 5 sec until that moment but the continuation in time ... how can I query a DB like that? SELECT x, y FROM run WHERE time >= DATEADD(second, -5, rundate); is not the recommended path right? and pulling this x in x time ... this is not real data feed correct? If can someone help me understand the Database point of view, I would greatly appreciate.

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  • How do you motivate peers to become better developers?

    - by Brian Rasmussen
    In my experience there seems to be two kinds of developers (if we simplify matters a great deal of course). On the one hand we have the developers, who may do a perfectly acceptable job, but who do not really care about the computer science part of their craft. They usually know few languages / technologies and are happy to let things stay that way. For whatever reason, they don't try to improve their computer science skills unless this is required in their current position. On the other hand, we have the geeks or the pragmatic programmers if you subscribe to that idea. They play around with other languages and technologies and usually have knowledge about several topics outside the technical domain of their current job. I would like to see more developers, who are enthusiastic about software development. If you share this point of view, what do you do to push your peers in that direction? Edit: follow-up question inspired by one of the answers: As non-managers, should we really care about this? And why/why not?

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  • FTP restrict user access to a specific folder

    - by Mahdi Ghiasi
    I have created a FTP Site inside IIS 7.5 panel. Now I have access to whole site using administrator username and password. Now, I want to let my friend access a specific folder of that FTP site. (for example, this path: \some\folder\accessible\) I can't create a whole new FTP Site for this purpose, since it says the port is being used by another website. How to create an account for my friend to have access to just an specific folder? P.S: I have read about User Isolation feature of IIS 7.5, but I couldn't find how to create a user just for FTP and set it to a custom path.

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  • Upgrading drives on a MD3000

    - by Anonymouse
    Hello, Our MD3000 array is getting full as our databases are growing and we need more spaces. Currently, we use a MD3000 with a two-servers Windows 2003 cluster and 15x 73GB SAS drives. Disk groups are configured in RAID1 of two drives. The approach we are currently investigating is simply swapping the existing SAS drives with bigger ones (300GB instead of 73GB), one at a time, and let each RAID1 array rebuilt. Is it a good approach? Will we be able to resize the array afterwards? Will we be able to resize the partitions afterwards? Can the Dell M3000 Management software do it or will we have to bring the server offline and use some partition software to do it? Thanks in advance.

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  • Interview Questions in OOP

    - by Fero
    Hi all, I faced the below interview questions in OOP under PHP language. Kindly clear my clarifications regarding this. I am very confused. As i am a beginner to OOP i got too confused. Could anyone clarify these things clearly? Difference between Abstract class and interface. Interviewer : Let us consider abstract class contains three abstract methods such as a,b,c and interface contains three methods a,b,c. In this case these do the same functionality. Then why are going for abstract and why are we going for interface. Me : ? static keyword. Interviewer: We call static method without creating object by using scope resolution operator in PHP. As well as we can able to call concrete methods also. Then what is need of static keyword there? Me : .... final keyword. Interviewer: Give me any scenario of using final keyword. Me : For db connection related method Interviewer: Other than that? Me: ... Constructor. Interviewer: What is the use of constructor? Me : There is no need for object to access this. It will call automatically when the class calls. Interviewer: Other than that? Me : .... Thanks in advance...

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  • Boot ubuntu 12.04 in 3D - nomodeset quiet splash install

    - by rahi
    I would like to enable 3D in Ubuntu 12.04. I recently tried to install ubuntu on a new computer. When the installation was complete and I rebooted the machine, I could only see a blank screen. After some searching, I followed this tutorial which instructed me to boot with "nomodeset" enabled. I choose this on the USB I was installing ubuntu 12.04 from. Fortunately, the ubuntu installation on the new computer was successful. When I tried to change the size of the unity launcher icons, I did not see that option (as I see on my other computer running ubuntu 12.04). I tried installing MyUnity and it told me that the computer I had just installed 12.04 to was running in 2D. To my knowledge. all the software is up to date (as I ran the Software Updater). In addition, when I look for Additional Drivers, I see a message that says "No proprietary drivers are in use on this system". When I look under System Details Graphics, I see the Driver as "VESA:Intel Sandybridge/Ivybridge Graphics. When I hold the shift key on when my machine boots up, and type "e" on the Grub menu, I see the following towards the end, "nomodeset quiet splash $vt_handoff". Does this have anything to do with the plain 2D ubuntu 12.04 experience? Again, what I'd like to do now is get the 3D experience on my new machine running 12.04. Please let me know if you need more information.

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  • Unity Dashboard won't find local files, rearrange icons on two computers

    - by Stanton.Sculpture
    Suddenly I can't move icons around my unity launcher and the Dash won't search for my local files and folders. Was working when I first installed 13.10, but now it won't search for local files, and it won't let me rearrange the icons in any way. I've tried turning on and off all the scopes (lenses?) in multiple combinations, but it won't find any files unless I use nautilus to find them its mostly unresponsive. I can't see my recently used files, or files and folders scope at all. Dragging and dropping the icons on the side dock doesn't work, they only stick to my mouse until I put them back where they were. I cannot unlock any icons from the launcher, it just doesn't do anything when I click it. I tried rebooting both of my computers and its still won't function normally. I used ubuntu-bug -w to report a bug, no one has gotten back to me. Is there some option that I changed to cause this? This is a problem on both my laptop and Desktop. Please Help, Alex

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  • Amazon CloudFormations and Oracle Virtual Assembly Builder

    - by llaszews
    Yesterday I blogged about AWS AMIs and Oracle VM templates. These are great mechanisms to stand up an initial cloud environment. However, they don't provide the capability to manage, provision and update an environment once it is up and running. This is where AWS Cloud Formations and Oracle Virtual Assembly Builder comes into play. In a way, these tools/frameworks pick up where AMIs and VM templates leave off. Once again, there a similar offers from AWS and Oracle that compliant and also overlap with each other. Let's start by looking at the definitions: AWS CloudFormation gives developers and systems administrators an easy way to create and manage a collection of related AWS resources, provisioning and updating them in an orderly and predictable fashion. AWS CloudFormations Oracle Virtual Assembly Builder - Oracle Virtual Assembly Builder makes it possible for administrators to quickly configure and provision entire multi-tier enterprise applications onto virtualized and cloud environments. Oracle VM Builder As with the discussion around should you use AMI or VM Templates, there are pros and cons to each: 1. CloudFormation is JSON, Assembly Builder is GUI and CLI 2. VM Templates can be used in any private or public cloud environment. Of course, CloudFormations is tied to AWS public cloud

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  • why the difference in google search result using script for search and using a browser for search

    - by Jayapal Chandran
    I wrote a code to find the position in google search result for a search keyword. I also did the same with the browser. Both the results are different. Let me explain in detail here. I have a website and i wanted to know on which page number my domain appears for a search string. Like when i search for 'code snippets' i wanted to find in google search on which page number a certain domain appears. I wrote a php code to search page by page starting from page 1 to page n. I did the same task using a browser. The script returned page 4 and when browsed i can see the domain appearing in second page. here is the search string i use in my code. /search?hl=en&output=search&sclient=psy-ab&q=code+snippets&start=0&btnG= and for each request i change the start=0 to start=1, start=2, etc... and in the response i will check whether my domain appears in it. any idea for this different in search results?

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  • How to solve: "Connect to host some_hostname port 22: Connection timed out"

    - by Aufwind
    I have two Ubuntu machines. Both have openssh-client and openssh-server installed on them. ssh-ing from machine G (fresh Ubuntu 11.10 installation) to machine K works great. But ssh-ing from machine K to machine G results always in the Error: Connect to host some_hostname port 22: Connection timed out I went through the troubleshooting section of help.ubuntu.com and I got the following results: ps -A | grep sshd # results in 848 ? 00:00:00 sshd - sudo ss -lnp | grep sshd # results in 0 128 :::22 :::* users:(("sshd",848,4)) 0 128 *:22 *:* users:(("sshd",848,3)) - ssh -v localhost # works! - sudo ufw status verbose # yields: "Status: inactive" I haven't change anything in the config file. What can I do to locate the Problem and solve it? Glad about every hint! Edit: ping was succesful in both directions! I did a telnet <machineK> 22 from machin G which resulted in Trying and then in telnet: Unable to connect to remote host: Connection timed out. But telnet the other way around worked just fine! Edit 2: ssh start/running, process 966 # yields: ssh start/running, process 966 /etc/hostname # contains my hostname, let's call it blubb /etc/hosts # contains the following 127.0.0.1 localhost # 127.0.1.1 blubb 129.26.68.74 blubb # I added this! - sudo service ufw status # yields: ufw start/running I installed Gufw and set it to ON. Then I selected from Incoming the option ALLOW. Then I sshed to another machine from where I sshed back to my machine. Still the same error as above: connect to host blubb port 22: Connection timed out Any more hints, what I can check?

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  • Config postGreSQL pg_hba.conf restric role access

    - by Mathias
    Hello postgre experts. I am completely new to the game but need the following: I Create a new role with login. Let's say: User1 I then create a Database 'User1Database' and set User1 as the owner. User1 has no rights to do anything except for access. Now when I connect using User1 it somehow has access to all databases. I then learned I neeed to write something in here. User1 should have global access to User1Database and absolutely no access to anything else. What lines do I need to add to my pg_hba file? Currently it looks like this: # IPv4 local connections: host all all 127.0.0.1/32 md5 # IPv6 local connections: host all all ::1/128 md5 host all all 0.0.0.0/0 md5 Hope someone can write me the exact lines and explain them to me.

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  • networking fails when DNS servers are specified manualy

    - by Matthew Scouten
    When I let Windows-7 use DHCP to find its own DNS server, everything works fine. Then I use ipconfig to get the IPs of the DNS servers in question, and specify them manually. Now the network stops working. (I need to do this because my next step is to restore the router that is going to lie about the proper DNS server. Don't ask why, it is required by my father's work. The IT there are not exactly on the ball.) Why would this make a difference? It is the same set of servers, just obtained differently.

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  • design a large scale network for an organization

    - by Essam
    i want to design a large scale network for an organization with HQ and two branches. i want to use a class A subnet. if i am using the network address 30.0.0.0 for the whole organization how can it be different from another organization company or whatever which is using the same address in another country? now i have the three locations for this organization,so i need 5 subnets [one for the HQ,two for branch A and branch B , one for connecting A to HQ and one for connecting branch B with HQ since i will use central DHCP server at the HQ,is that (number of subnetting) right? is it advisable to use class A or class B for this organization it term of address that will be wasted (let's say it is a university with two branches in two different states)?!

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  • Exchange 2007 Email Address Policies

    - by Ryan Migita
    We have recently upgraded to Exchange 2007 (from 2003) and have noticed the change from recipient policies to email address policies. We have two separate domains (let's call them domaina.com and domainb.com) we receive email for, have email address policies and both email address policies are not applied. In our Exchange 2003 environment, domaina.com was the default email address when we created new mailboxes and due to the migration, domainb is the default (and its email address policy is a higher priority). Now, when we create a new mailbox (or edit existing ones), the primary email address becomes domainb.com. Now the question is, is this as simple as putting the email address policies in the correct order? Do I have to apply both policies? What effect will the above changes make to existing mailboxes? Since we do not have any conditions set on the policies, I assume prior to making these changes, I should force all domainb mailboxes to not automatically update email address based on policy? Thanks in advance!

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  • What can be done to decrease the number of live issues with applications?

    - by User Smith
    First off I have seen this post which is slightly similar to my question. : What can you do to decrease the number of deployment bugs of a live website? Let me layout the situation for you. The team of programmers that I belong to have metrics associated with our code. Over the last several months our errors in our live system have increased by a large amount. We require that our updates to applications be tested by at least one other programmer prior to going live. I personally am completely against this as I think that applications should be tested by end users as end users are much better testers than programmers, I am not against programmers testing, obviously programmers need to test code, but they are most of the times too close to the code. The reason I specify that I think end users should test in our scenario is due to the fact that we don't have business analysts, we just have programmers. I come from a background where BAs took care of all the testing once programmers checked off it was ready to go live. We do have a staging environment in place that is a clone of the live environment that we use to ensure that we don't have issues between development and live environments this does catch some bugs. We don't do end user testing really at all, I should say we don't really have anyone testing our code except programmers, which I think gets us into this mess (Ideally, we would have BAs or QA or professional testers test). We don't have a QA team or anything of that nature. We don't have test cases for our projects that are fully laid out. Ok, I am just a peon programmer at the bottom of the rung, but I am probably more tired of these issues than the managers complaining about them. So, I don't have the ability to tell them you are doing it all wrong.....I have tried gentle pushes in the correct direction. Any advice or suggestions on how to alleviate this issue ?

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  • TechEd India Recap

    Last week I spoke at TechEd India and the Visual Studio 2010 launch. It was a great event with over 3,000 attendees, far more than attended the Visual Studio launch in Las Vegas! Senior vice president of the Developer Division at Microsoft, S. Somasegar, did an awesome keynote. I did three sessions: Building applications with OData Building Line of Business Applications with WCF and Silverlight 4.0 Building Silverlight Business Applications with RIA Services Something happened to me that never happened before in my 13+ years of being a professional international speaker: I lost my voice! I was in Indonesia the week before and picked up a small bug and had no voice. This was a new challenge for me, and Microsoft offered to cancel my sessions, but I figured why would I let no voice stop me from delivering my sessions!! So I decided to throw away the slides and just code. I had no voice anyway, ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Apache Prepending Header Information to ALL FILES

    - by Michael Robinson
    We're in the middle of setting up new servers, and have been having some odd problems with Apache. Apache is prepending text that looks like this: $15plðI‚‚?E?ðA™@?@??yeÔ|~Ÿ²?PγZ" zS€?8i³?? ,ÀŠ{ÿBHTTP/1.1 200 OK Date: Mon, 02 Feb 2009 22:28:05 GMT Server: Apache/2.2.3 (CentOS) Last-Modified: Mon, 02 Feb 2009 22:28:05 GMT ETag: W/"1238007d-2224e-fe617f40" Accept-Ranges: bytes Content-Length: 139854 Connection: close Content-Type: application/x-javascript To all files. The file I copied the above text from is the prototype library js file. As loaded from our server. I've searched, but couldn't find much about this problem Maybe I don't know what I'm searching for... Anyway, if anyone has seen this behaviour before, could they please let me know either 1) how to fix it so that this content is not prepended to all files, or 2) where to look for further help. Thanks

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