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  • Exceptions handling in SQL?

    - by Vineet
    Is there any way to handle exceptions in sql(ORACLE 9i)? Since I was trying to divide values of a column that contains both numbers and literals ,I need to fetch out only numbers from it ,as if it divisible by any number then its number else if contains literals it would not get divided it will generate error. how to handle those errors? Please suggest!!

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  • Bridging two networks

    - by Jukodan
    I'm hoping you may be able to offer some advice as I'm not very familiar with setting up routers/access points. I have a network of computers on an active directory domain on the 192.NET. I then have another network on the 10.NET that needs to have access to the domain on the 192.NET. I am using cisco/linksys routers. What methodology would you suggest so that these two can communicate and I can add the computers form the 10.NET to the domain? Edit: Basically, I'm having trouble figuring out how to setup a static route

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  • SQL running slow when i executes thru java

    - by user270885
    I am trying to execute a query in oracle db. When i try to run thru SQLTools the query is executing in 2 seconds and when i run the same query thru JAVA it is exectuting in more than a minute. I am using a hint /*+ordered use_nl (a, b)*/ I am using ojdbc6.jar Is it because of any JARS? Please help whats causing this?

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  • nginx location pathing issue

    - by Michael Jefferys
    I've got a pretty much default sites-enabled set up in my nginx on debian squeeze and i'm now trying to get it to serve up my munin graphs on myhost/munin/ Heres the location i've added to the config location /munin { root /var/cache/munin/www/; index index.htm index.html; } And here is the error I recieve: 2012/07/09 23:52:03 [error] 3598#0: *13 "/var/cache/munin/www/munin/index.htm" is not found (2: No such file or directory), client: 93.*.*.*, server: , request: "GET /munin/ HTTP/1.1", host: "" This set up used to 'just work' in apache. I'm new to nginx so a bit lost as to why its adding the extra /munin when looking for the path. Any advice?

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  • Apache 2.4 subdomain setup fails

    - by Grashopper
    I am struggling with this all the day, no answer i found here as well. Please advice how to setup proper a subdomain i need. My Apache config has 2 domains configured (on same IP), for the domain2.com i need to setup a sub-domain. Here is what i have so far, but the subdomain keeps redirecting me to domain2.com (main site). <VirtualHost 11.11.11.11:80> ServerName domain1.com ServerAlias domain1.com *.domain1.com DocumentRoot "C:/wwwmap/domain1.com" </VirtualHost> <VirtualHost 11.11.11.11:80> ServerName domain2.com ServerAlias domain2.com *.domain2.com DocumentRoot "C:/wwwmap/domain2.com" </VirtualHost> <VirtualHost 46.4.24.4:80> ServerName projects.domain2.com DocumentRoot "C:/wwwmap/projects" </VirtualHost> The DNS entry is: projects in CNAME domain2.com Trying to remove ServerAlias domain2.com *.domain2.com worked so far, but then domain2.com is redirecting to domain1.com What am i doing wrong?

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  • asp code for excel upload

    - by vicky
    i want to upload an excel file from the client to the server using asp .then it shud check the field name of the file with the oracle database table and then save its content in the database. can somebody help me with this....??

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  • asp.net selecting a checkbox from the grid view

    - by baburam
    i am trying to get checkbox value ,using c# In grid view the datasource is from oracle i have added the checkbox but the value is not coming please help me in checking the value of check box this is for selecting the candidate if the checkbox is selected the particular candidate name is selected and the candidate names are appended in a string

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  • Why did Sun develop the Java platform? [closed]

    - by nic28
    Why did Sun (now owned by Oracle, I know) develop the Java Plaform? How does it make business sense? It seems to me like it would be a very expensive project (also, any ideas on how much they spent/are spending to develop/maintain the platform?). Are they making money by selling support or something?

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  • windows7 cant get to internet( cable connection)

    - by user29297
    I'm using a window 7 with wireless & cable equipments to connect to internet, it's been fine for moths. But Three days ago, the local connection ran out of control and i can no longer use the cable to get access to internet. But fortunately the wireless equipment still works. I reinstalled the driver, took off/inserted in the cable, the computer still didn't work. And every time I let the computer diagnose itself, it told me that :"Default gateway is not valid"(or something else, forgive my terrible english XD). If anyone could give any advice, i will be very appreciated. And I'm in california, but i don't know the gateway of this area.

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  • What factors should be taken into consideration before buying a computer Moniter (display/screen)?

    - by coding crow
    I work on computer for most of waking day and have been using a 13.3" laptop. I was planning to buy a good monitor/screen/display for sometime now but was lazy. Now I have developed Computer Vision Syndrome and buying a monitor has become immediate priority. I have spend some time on net and trying to understand what should I buy and why? I could only zero down on the size (20") and LED and looking for advice on many other factors like resolution, pixel density, panel technology and so forth. It will be great help if someone experienced can show shed some light on computer monitor best for the programmers spending 8 to 10 hours in front of the screen.

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  • SQL Server 2008 (64-bit)

    - by Grace09
    I have transaction log backup failures randomly. SQL Server Log says 'Memory constraints resulted reduced backup/restore buffer sizes. Proceding with 6 buffers of size 64KB.', and the SQL Server Agent Error Log has quite a few errors like 'Unable to start Job Manager thread for job xxx', '[298] SQLServer Error: 768, Client unable to establish connection [SQLSTATE 08001]', [298] SQLServer Error: 768, SSL Provider: Not enough memory is available to complete this request [SQLSTATE 08001]'. I am really low on the memory? It has total of 32 GB, but I set maximum to 20. Task manager shows it is using 99% of physical memory. Memoryclerk-sqlbufferpool has 32GB for the Virtual Memory Reserved, and 20 GB for the Virtual Memory Committed. From the perfmon, SQLServer:Memory Manager/Total ServerMemory shows 21GB of memory in use, that's what I set the maximum to. I don't where the rest of memory go. Can anyone advice? Thanks in advance.

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  • ODBC in SSIS 2012

    - by jamiet
    In August 2011 the SQL Server client team published a blog post entitled Microsoft is Aligning with ODBC for Native Relational Data Access in which they basically said "OLE DB is the past, ODBC is the future. Deal with it.". From that blog post:We encourage you to adopt ODBC in the development of your new and future versions of your application. You don’t need to change your existing applications using OLE DB, as they will continue to be supported on Denali throughout its lifecycle. While this gives you a large window of opportunity for changing your applications before the deprecation goes into effect, you may want to consider migrating those applications to ODBC as a part of your future roadmap.I recently undertook a project using SSIS2012 and heeded that advice by opting to use ODBC Connection Managers rather than OLE DB Connection Managers. Unfortunately my finding was that the ODBC Connection Manager is not yet ready for primetime use in SSIS 2012. The main issue I found was that you can't populate an Object variable with a recordset when using an Execute SQL Task connecting to an ODBC data source; any attempt to do so will result in an error:"Disconnected recordsets are not available from ODBC connections." I have filed a bug on Connect at ODBC Connection Manager does not have same funcitonality as OLE DB. For this reason I strongly recommend that you don't make the move to ODBC Connection Managers in SSIS just yet - best to wait for the next version of SSIS before doing that.I found another couple of issues with the ODBC Connection Manager that are worth keeping in mind:It doesn't recognise System Data Source Names (DSNs), only User DSNs (bug filed at ODBC System DSNs are not available in the ODBC Connection Manager)  UPDATE: According to a comment on that Connect item this may only be a problem on 64bit.In the OLE DB Connection Manager parameter ordinals are 0-based, in the ODBC Connection Manager they are 1-based (oh I just can't wait for the upgrade mess that ensues from this one!!!)You have been warned!@jamiet

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  • Installation stuck on "Installation Type" screen

    - by Andrew Latham
    I am trying to install Ubuntu 11.10 with Windows 7 from a CD. I am using an HP Pavilion dm4. I've never used Ubuntu (or any Linux) before. Everything goes alright until I get to the "Installation Type" screen. Instead of giving me options, it just has a blank menu, and all the buttons are disabled. When I click "Continue", it gives me an error saying that it can't find the root or something like that. The trial version works fine, but I can't actually install it. Everything on the trial version is really slow, presumably because everything is on the CD or the Windows partition. I did some research, but the only post I could find was http://ubuntuforums.org/showthread.php?t=1870478 Where the only advice is to format the entire drive, which I'm not willing to do. Any suggestions? I'm downloading 10.04 right now and I'm going to try with that instead. EDIT: 10.04 didn't work either. I got to the partitioning screen and got the same problem. I read some more forums, loaded up 11.10 trial from the disk, opened the Terminal and typed sudo apt-get remove dmraid and then y. Then I was actually able to see something on the "Installation type" page: "Erase disk and install Ubuntu" or "Something else". Which is weird, since Windows 7 should be installed. When I click Something Else, I get: /dev/sda /dev/sdb /dev/sdb1 (ntfs) (208 MB) (69 MB used) /dev/sdb2 (ntfs) (477542 MB) (unknown used) /dev/sdb3 (ntfs) (18085 MB) (16094 MB used) /dev/sdb4 (fat32) (4265 MB) (3084 MB used) I have no idea what any of this means. Also, my device for boot loader installation changed from /dev/sda to /dev/sda ATA SAMSUNG MZMPA032 (32.0 GB)

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  • Microsoft guarantees the performance of SQL Server

    - by simonsabin
    I have recently been informed that Microsoft will be guaranteeing the performance of SQL Server. Yes thats right Microsoft will guarantee that you will get better performance out of SQL Server that any other competitor system. However on the flip side there are also saying that end users also have to guarantee the performance of SQL Server if they want to use the next release of SQL Server targeted for 2011 or 2012. It appears that a recent recruit Mark Smith from Newcastle, England will be heading a new team that will be making sure you are running SQL Server on adequate hardware and making sure you are developing your applications according to best practices. The Performance Enforcement Team (SQLPET) will be a global group headed by mark that will oversee two other groups the existing Customer Advisory Team (SQLCAT) and another new team the Design and Operation Group (SQLDOG). Mark informed me that the team was originally thought out during Yukon and was going to be an independent body that went round to customers making sure they didn’t suffer performance problems. However it was felt that they needed to wait a few releases until SQL Server was really there. The original Yukon Independent Performance Enhancement Team (YIPET) has now become the SQL Performance Enforcement Team (SQLPET). When challenged about the change from enhancement to enforcement Mark was unwilling to comment. An anonymous source suggested that "..Microsoft is sick of the bad press SQL Server gets for performance when the performance problems are normally down to people developing applications badly and using inadequate hardware..." Its true that it is very easy to install and run SQL, unlike other RDMS systems and the flip side is that its also easy to get into performance problems due to under specified hardware and bad design. Its not yet confirmed if this enforcement will apply to all SKUs or just the high end ones. I would personally welcome some level of architectural and hardware advice service that clients would be able to turn to, in order to justify getting the appropriate hardware at the start of a project and not 1 year in when its often too late.

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  • Xcode 3 or Xcode 4

    - by Randolf
    Hi. I'm starting to learn development for the mac (then I'll learn iOS development). I just buy an iOS developer program, and I see there are 2 IDEs available for download: Xcode 3.x and Xcode 4 (GM Status). So I don't know where to start. Site's says that Xcode 4 its now "integrated" so there is one app instead of 3, and that it's better for small screen because tabs and other features (I'm using a 13" macbook). But looking for books I see books only for 3.X. I'm a C# & .NET programmer, I know that the fundamental is the language and the framework (Cocoa) but I've been told that getting proficient with Mac Dev is getting proficient with Xcode. I think that if I start with Xcode 4, then I'll learn on the "next" IDE and since I have no hurry I can wait until apps made with Xcode 4 are deployable (on the app store). But, maybe I'm wrong and I should start with Xcode 3 and the largest set of books and references available. Any advice?

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  • Letter to Ballmer: Making Better Consumer Devices

    - by andrewbrust
    Last year, I wrote Steve Ballmer an email, and he was kind enough to write me back.  The email contained a scan of a column I wrote praising Microsoft’s BI strategy.  His reply contained three simple words: “Super nice  thanks.” Well, now I’d like to write to Steve again, in an open letter format, and this time the love may be a bit tougher.  But I’m still super earnest. The past two days have been eventful ones for Microsoft: The company announced the departure of company veterans Robbie Bach and J Allard and the market announced Apple is now besting Microsoft in market capitalization. Plus, announcements were made that make it plain that Ballmer will, in effect, be running Microsoft’s Entertainment & Devices division himself. With that in mind, I’d like to offer my list of a dozen things I think Microsoft’s CEO should do to improve that division’s offerings and, hopefully, its bottom line. So here goes:   1. On Windows Phone 7, Stay the Course The press is teeming with headlines and reader comments proclaiming the death-before-arrival of Windows Phone 7.  That’s plain silly.  You’ve got the makings of a great and unique SmartPhone platform, and you’re the only company (even considering RIM) that can offer full fidelity Exchange integration, not to mention implementing Office on the device.  Let the existing team finish this puppy and ship it. And then have them pump out a few updates, over-the-air, quickly.  Show them that Google Android’s not the only product that can do good, rapid dot releases. And another thing: make sure your OEMs’ devices have flawless touch screens.  If they don’t, then you shouldn’t certify them for delivery to customers.  Period. Oh, and kill the Kin, quietly.  It was DOA, and you know it.   2. Move Media Center to the Xbox Platform Media Center is, at its core, a good product.  But delivering a media distribution and DVR platform on a sophisticated PC operating system like Windows 7 just creates too many moving parts.  Xbox already functions as the best Media Center extender device – it should actually be the hub as well. Media Center is mostly based on .NET code – and XNA is a .NET environment for Xbox – find a way to bridge that small gap and make Media Center a joy to work with instead of a frustration.  Beating Apple TV out of this sub-market is the lowest hanging fruit on the tree (goofy pun, but it’s true).   3. Integrate Media Center with Mediaroom, or Kill the Latter You have two media products with almost identical names.  One is for standalone DVRs and the other is for IPTV cable set tops with DVR capabilities.  Can we merge these please?  My previous request of putting Media Center on Xbox would seem to tie into this nicely, since you’ve announced plans to do that with Mediaroom already.   4. Fix the Red Ring of Death People love the Xbox, but they really don’t love sending their consoles back every 18-24 months, when they get a bunch of red lights flashing on power up.  You’ve handled this defect about as gracefully as possible, but it’s been around for a long time now and it doesn’t seem to be fixed yet.  You can do better.  In fact, you must do better, or you insult your customers.   5. Add Blu Ray to Xbox I know, streaming movies are the future; physical media is legacy technology.  So if that’s true, why did you back HD DVD so hard?  You know why: for now, the film studios won’t allow a large selection of new release, HD, surround sound content be distributed on any medium other than Blu Ray or cable pay per view/on-demand.  Don’t you want home theater buffs to see the Xbox as a fantastic device for their rigs?  Don’t you want to put PlayStation 3 out of its misery?  And if you follow my suggestions above (move Media Center to the Xbox and fix the Red Ring problem), you’d have it all sewn up.  Do I think Blu Ray functionality will move a lot of units?  No.  Do I think that it would move more units with desperately needed influential home theater consumers?  You bet.  And you might sell more ZunePass subscriptions in the process. But while you’re at it, make the fan quieter, please.   6. Make More of Windows Home Server Home Server is a fantastic product.  And for reasons unknown to me, it seems like you’re letting it languish.  Development of the add-in ecosystem seems underfunded.  WHS’ unparalleled ease of use and reliability for home PC backup (and emergency restores) goes unsung.  Product cycles are slow.  Support for your OEMs, who are doing great work, especially in the green space with Atom CPUs, seems lacking.  You’ve married a trophy girl and you keep her cloistered at home!  That’s cruel, unusual and, um, incredibly ill-advised.  Make use of this ace card, and while you’re at it, give it real integration with Media Center.  The integration thus far proof-of-concept quality.  You should go way past that – both products will benefit immeasurably.   7. Set Up a Partner Platform for Custom Installers There’s a whole sub-industry of companies that install, integrate and configure home theater, security and connected home products.  They have an industry group. They are influential in the high-end of the consumer electronics industry, and so are their customers.  They love Media Center and they love Windows Home Server.  But I have talked to several of them at the Consumer Electronics Show and they tell me you don’t love them.  They find it very difficult to do business with Microsoft, even though they want nothing more than to sell and evangelize your platform.  This is a travesty.  Please fix it.  Get Allison Watson and the Microsoft Partner Network on board and have her hire someone who knows how to run a channel program for consumer electronics companies.  Problem solved.  Markets expanded.   8. Make Your Own Hardware In other areas, I know you love your partners.  I help run one, so I appreciate that.  But when it came to Xbox and Zune you built them it yourself (albeit on a contract basis, which is fine).  Windows Phone 7 has a chance to work as an OEM play, but it would work better if you produced the devices.  At least consider building a reference device that sells alongside your OEMs’ offerings.  That’s what Google did with the Nexxus One.  And while that phone was not itself a big seller, it catalyzed two wonderful things : (1) a quality bar was set and (2) partners exceeded it.  Before the Nexxus One, the best Android handset out there was the Motorola Droid. The Nexxus One was better, and the HTC Droid Incredible and Evo 4G are now even better than Google’s phone, which is why Verizon and Sprint decided not to carry it.  Imagine if all Windows Phone 6.x devices were on par with the HTC HD2.  I tend to believe you’d have a lot bigger market share than you do now.   9. Continue with Your Retail Initiative From what I hear, it sounds like it’s going well.  And this goes right along with making your own hardware.  When you build it, they will come.  And then it makes the likes of Best Buy and Staples do better.   10. Make an Acquisition (or Two) TiVo and/or Moxi look ripe for the picking.  With their ability to build stuff people love and your ability to run a business, you might just have something.  But do a better job than you did when you bought Danger.  Buy the ideas, not just the customers, eh?   11. Make Beautiful Stuff You’ve heard this one before, I know.  But I have some head-shrinking advice on this one.  You know that Apple obsesses over its industrial design.  You know that appeals to consumers.  But it seems you think doing so is Apple’s game exclusively and so you shouldn’t even try.  Bull dinky.  Come to New York and visit the Museum of Modern Art’s Architecture and Design gallery.  You’ll see that lots of companies and product categories have had very high design value well before Apple existed.  You can do this, and the Zune HD was a great start.  Now run with that.  Find those negative voices in your head that are telling you that you can’t and shut them up.  For good.   12. Burst the Bubble Some of the products you’ve built seem like they were conceived in a bizarro world.  That would appear to be the result of groupthink.  You must do better.  And there’s lots of people willing to advise you.  This includes just about everyone in the Regional Director program, and probably a bunch of MVPs.  Heck, I bet the guys at Engadget could help out too.  Imagine if you let them see the Kin before it shipped.  Talk to high-end gear consumers.  Talk to Best Buy and CostCo customers too.   Signing Off I hope this was of value to you.  As I wrote this I kept telling myself how obvious, even trite, some of these pieces of advice were and then, because of that, doubting they’d really help.  But I decided that they must not be obvious to Microsoft.  Sometimes when you get wrapped up in stuff, it’s hard to clear your head.  I think my head’s pretty clear here though (I’m wrapped up in other stuff), so maybe my perspective can help.  If not, well, then, I guess they all can’t be super nice.

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  • SQL SERVER – GUID vs INT – Your Opinion

    - by pinaldave
    I think the title is clear what I am going to write in your post. This is age old problem and I want to compile the list stating advantages and disadvantages of using GUID and INT as a Primary Key or Clustered Index or Both (the usual case). Let me start a list by suggesting one advantage and one disadvantage in each case. INT Advantage: Numeric values (and specifically integers) are better for performance when used in joins, indexes and conditions. Numeric values are easier to understand for application users if they are displayed. Disadvantage: If your table is large, it is quite possible it will run out of it and after some numeric value there will be no additional identity to use. GUID Advantage: Unique across the server. Disadvantage: String values are not as optimal as integer values for performance when used in joins, indexes and conditions. More storage space is required than INT. Please note that I am looking to create list of all the generic comparisons. There can be special cases where the stated information is incorrect, feel free to comment on the same. Please leave your opinion and advice in comment section. I will combine a final list and update this blog after a week. By listing your name in post, I will also give due credit. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Constraint and Keys, SQL Data Storage, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, SQLServer, T SQL, Technology

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  • Unavailable repository

    - by katrina
    I am new to Ubuntu and keep butting up against errors, such as this: Package libpng12-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: libpng12-0 E: Unable to locate package subversion E: Package 'git-core' has no installation candidate E: Package 'build-essential' has no installation candidate E: Package 'autoconf' has no installation candidate E: Package 'libtool' has no installation candidate E: Unable to locate package libxml2-dev E: Unable to locate package libgeos-dev E: Unable to locate package libpq-dev E: Unable to locate package libbz2-dev E: Package 'proj' has no installation candidate E: Unable to locate package munin-node E: Unable to locate package munin E: Unable to locate package libprotobuf-c0-dev E: Unable to locate package protobuf-c-compiler E: Unable to locate package libfreetype6-dev E: Package 'libpng12-dev' has no installation candidate E: Unable to locate package libtiff4-dev E: Unable to locate package libicu-dev E: Unable to locate package libboost-all-dev E: Unable to locate package libgdal-dev E: Unable to locate package libcairo-dev E: Unable to locate package libcairomm-1.0-dev E: Couldn't find any package by regex 'libcairomm-1.0-dev' E: Unable to locate package apache2 E: Unable to locate package apache2-dev E: Unable to locate package libagg-dev when I want to do this: sudo apt-get install subversion git-core tar unzip wget bzip2 build-essential autoconf libtool libxml2-dev libgeos-dev libpq-dev libbz2-dev proj munin-node munin libprotobuf-c0-dev protobuf-c-compiler libfreetype6-dev libpng12-dev libtiff4-dev libicu-dev libboost-all-dev libgdal-dev libcairo-dev libcairomm-1.0-dev apache2 apache2-dev libagg-dev. Any help or advice would be greatly appreciated. Or referrals to other questions...

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  • Box 2d basic questions

    - by philipp
    I am a bit new to box2d and I am developing an game with type and letters. I am using an svg font and generate the box2d bodies direct from the glyphs path definition, using the convex hull of them. I also have an decomposition routine the decomposes this hull if necessary. All this it is more or less working, except that I got some strange errors which definitely are caused by the scale factors. The problem is caused by two factors: first: the world scale of box2d, second: the the precision of curve-approximation of the glyph vectors. So through scaling down the input vertices for box2d, it happens that they become equal caused by numerical precision, what causes errors in box2d. Through scaling the my glyphs a bit up, this goes away. I also goes away if I chose a different world scale factor, but this slows down the whole animation quite much! So if my view port is about 990px * 600px and i want to animate Glyphs in box2d which should have a size from about 50px * 50px up to 300px * 300px, which scale factor of the b2world should i choose? How small should the smallest distance from on vertex to another be, while approximating the glyph vectors? Thanks for help greetings philipp EDIT:: I continued reading the docs of box2d and after rethinking of the units system, which is designed to handle object from 0.1 up to 10 meters, I calculated a scale factor of 75. So Objects 600px width will are 8 meters wide in box2d and even small objects of about 20px width will become 0.26 meters width in box2d. I will go on trying with this values, but if there is somebody out there who could give me a clever advice i would be happy!

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  • Getting beyond basic web programming languages. How to be awesome?

    - by user73962
    I'm a web developer that's done a bunch of projects using PHP, JQuery/JS, Mysql using PhPMyAdmin, CSS, HTML and a tiny bit of XML. Basically lots of work with CMS's and freehand coding. I'm looking to take things to the next level. I've done a lot of freelance and small contract work, but I'm dying to excel. I'm tired of acting as tech support for all these "non-tech" companies that barely know how to use their own computers..."really, you didn't think to backup your files before switching to a new server??". Think of potential employers as amazon, netflix, twitter, google, etc. I don't necessarily want to work for these guys specifically, but potentially organizations like this. I could be wrong, but I feel like a big company like this would laugh at me if I interviewed. For example, how helpful is knowing Ruby, SQL (commands without interface), C++, API's, Oracle, Java, debugging, qa, etc? (I realize this is a very random list). I use Notepad ++, but have heard that the bigger boys use IDE interfaces. I'm not really interested in building desktop apps, only web related stuff. I feel like I've reached my potential and want to really take it up a notch. I see a lot of projects on GitHub and I'm amazed at what people have created. Note - my degree is in economics but I've done web dev since high school. I definitely wish I took more comp sci/programming courses in college. I'm 27 and want to be awesome at web dev before it's too late. Not just decent. Any advice? Book suggestions? Thanks

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  • 3D terrain map with Hexagon Grids

    - by Rob
    I'm working on a hobby project (I'm a web/backend developer by day) and I want to create a 3D Tile (terrain) engine. I'm using XNA, but I can use MonoGame, OpenGL, or straight DirectX, so the answer does not have to be XNA specific. I'm more looking for some high level advice on how to approach this problem. I know about creating height maps and such, there are thousands of references out there on the net for that, this is a bit more specific. I'm more concerned with is the approach to get a 3D hexagon tile grid out of my terrain (since the terrain, and all 3d objects, are basically triangles). The first approach I thought about is to basically draw the triangles on the screen in the following order (blue numbers) to give me the triangles for terrain (black triangles) and then make hexes out of the triangles (red hex). This approach seems complicated to me since i'm basically having to draw 4 different types of triangles. The next approach I thought of was to use the existing triangles like I did for a square grid and get my hexes from 6 triangles as follows This seems like the easier approach to me since there are only 2 types of triangles (i would have to play with the heights and widths to get a "perfect" hexagon, but the idea is the same. So I'm looking for: 1) Any suggestions on which approach I should take, and why. 2) How would I translate mouse position to a hexagon grid position (especially when moving the camera around), for example in the second image if the mouse pointer were the green circle, how would I determine to highlight that hexagon and then translating that into grid coordinates (assuming it is 0,0)? 3) Any references, articles, books, etc - to get me going in the right direction. Note: I've done hex grid's and mouse-grid coordinate conversion before in 2d. looking for some pointers on how to do the same in 3d. The result I would like to achieve is something similar to this video.

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  • Starting a Java activity in Unity3d Android

    - by Matthew Pavlinsky
    I wrote a small Java activity extension of UnityPlayerActivity similar to what is described in the Unity docs. It has a method for displaying a song picking interface using an ACTION_GET_CONTENT intent. I start this activity using startActivityForResult() and it absolutely kills the performance of my Unity game when it is finished, it drops to about .1 FPS afterwords. I've changed removed the onActivityResult function and even tried starting the activity from inside an onKeyDown event in Java to make sure my method of starting the activity from Unity was not the problem. Heres the code in a basic sense: package com.company.product; import com.unity3d.player.UnityPlayerActivity; import com.unity3d.player.UnityPlayer; import android.os.Bundle; import android.util.Log; import android.content.Intent; public class SongPickerActivity extends UnityPlayerActivity { private Intent myIntent; final static int PICK_SONG = 1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.i("SongPickerActivity", "OnCreate"); myIntent = new Intent(Intent.ACTION_GET_CONTENT); myIntent.setType("audio/*"); } public void Pick() { Log.i("SongPickerActivity", "Pick"); startActivityForResult(myIntent, PICK_SONG); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); } } This is causing me a bit more of a headache than it should and I would be thankful for any sort of advice. Does anyone have any experience with using custom activities in Unity Android or any insight on why this is happening or how to resolve this?

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  • What's wrong with cplusplus.com?

    - by Kerrek SB
    This is perhaps not a perfectly suitable forum for this question, but let me give it a shot, at the risk of being moved away. There are several references for the C++ standard library, including the invaluable ISO standard, MSDN, IBM, cppreference, and cplusplus. Personally, when writing C++ I need a reference that has quick random access, short load times and usage examples, and I've been finding cplusplus.com pretty useful. However, I've been hearing negative opinions about that website frequently here on SO, so I would like to get specific: What are the errors, misconceptions or bad pieces of advice given by cplusplus.com? What are the risks of using it to make coding decisions? Let me add this point: I want to be able to answer questions here on SO with accurate quotes of the standard, and thus I would like to post immediately-usable links, and cplusplus.com would have been my choice site were it not for this issue. Update: There have been many great responses, and I have seriously changed my view on cplusplus.com. I'd like to list a few choice results here; feel free to suggest more (and keep posting answers). As of June 29, 2011: Incorrect description of some algorithms (e.g. remove). Information about the behaviour of functions is sometimes incorrect (atoi), fails to mention special cases (strncpy), or omits vital information (iterator invalidation). Examples contain deprecated code (#include style). Inexact terminology is doing a disservice to learners and the general community ("STL", "compiler" vs "toolchain"). Incorrect and misleading description of the typeid keyword.

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  • I want to make video games, but I hate coding

    - by hoper
    I know this sounds eally crazy. However, I just want to ask. Now, I am studying C++ code in my school (My major is computer programming). Honestly, my grade is not so good, and assignments are really hard. Sometimes, I feel sad that I will spend 8~10 hours per day for coding (which is stressful) at the future for my job. But, I still want to make video games. Maybe this is the only one reason why I am taking all of stressful courses. I always write down plots, stories, characters, fictional gaming worlds. Once, I thought I should study artistic technology such as game design program not computer technology such as C++, C#, etc. However, most of popular game designers(or directors) such as Kojima, Miyamoto Shigeru, etc used to be good programmers. And, companies actaully assign programmers to directors because they understand how to make a game. I try to find other colleges or universities where teach game design program. However, one article that lists rank 10 game design schools in North America seems untrustful because the survey company only scores it from intervews of students. (Once, I tried to attend Art Institute of Vancouver which is rank 7 according to that article. However, one programmer who used to be an instructor in there told me the truth. That is the employement rate of graduated students is low) Do you guys have any advice for me?

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  • Can I use <link> tags in the body of an HTML document?

    - by Edward Touw
    Can I use <link> tags in the body of an HTML page? I tried to find the answer to this question, but found contradictory information. When adding Schema.org microdata markup to an HTML page, I want to add canonical info in a link tag like this: <div itemscope itemtype="http://schema.org/Book"> <span itemprop="name">The Catcher in the Rye</span>— <link itemprop="url" href="http://en.wikipedia.org/wiki/The_Catcher_in_the_Rye" /> by <span itemprop="author">J.D. Salinger</span> </div> I got the example code above from Schema.org. According to them, this is the way to go for people that want to add a canonical reference to an itemprop, but don't want to place a hyperlink on their website. W3 however clearly states that <link> tags should only be placed within the head section, thus making the Schema.org example invalid. If I want to stick to correct markup, which advice should I follow?

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