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• bump mapping with 2 normal maps

  - by DorkMonstuh

  I was wondering if its actually possible to do bump mapping with 2 normal maps... I have tried doing it this way however I get a function overload on max and dot. uniform sampler2D n_mapTex; uniform sampler2D n_mapTex2; uniform sampler2D refTex; varying mediump vec2 TexCoord; varying mediump float vTime; void main() { mediump vec4 wave = texture2D(n_mapTex, TexCoord - vTime); mediump vec4 wave2 = texture2D(n_mapTex2, TexCoord + vTime); mediump vec4 bump = mix(wave2, wave, 0.5); //this extracts the normals from the combined normal maps mediump vec4 normal = normalize(bump.xyzw * 2.0 - 1.0); //determines light position mediump vec3 lightPos = normalize(vec3(0.0, 1.0, 3.0)); mediump float diffuse = max(dot(normal, lightPos),0.0); gl_FragColor = mix(texture2D(refTex, TexCoord), bump, 0.5); }

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• Syncing properties across a game server

  - by Vaughan Hilts

  I'm beginning to implement a simple scripting system into my networked server, and I've hit a snag. Before, I've been wrapping my calls into functions on objects that manipulate objects, but lately I've been finding this to be a pain for simple things. For example, if I set 'player.HP = 1'.. this works server-side. But the player side never sees this change unless I explicitly send a packet to inform the client. For many things like map swapping that require more complicated changes, like change X, Y, Map and do this.. I have a function. That's fine. But what about these small properties I want to sync?

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• How can I enable audio system on Envy 15t-3200

  - by Dean Howell

  I just received my HP Envy 15 (June 2012 model) and I cannot get my audio system to fully function. This laptop has 6 speakers. 1.) 2 speakers on the front of the laptop (Stereo). 2.) 2 speakers above the keyboard, just before the LCD hinges. 3.) 2 Subwoofer speakers underneath the battery cover facing downward. Only the 2 speakers in the front are working. This is a "Beats" audio system. There have been many beats audio laptops before this one, so maybe if someone has experience with those, it might translate to this device.

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• Creating a 2D Line Branch (Part 2)

  - by Danran

  Yesterday i asked this question on how to create a 2D line branch; Creating a 2D Line Branch And thanks to the answered provided, i now have this nice looking main branch; *coloured to show the different segments in the final item. Now is the time now to branch things off as discussed in the article; http://drilian.com/2009/02/25/lightning-bolts/ Again however i am confused as to the meaning of the following pseudo code; splitEnd = Rotate(direction, randomSmallAngle)*lengthScale + midPoint; I'm unsure how to actually rotate this correctly. In all honesty i'm abit unsure what to-do completely at this part, "splitEnd" will be a Vector3, so whatever happens in the rotate function must then return some form of directional rotation which is then * by a scale to create length and then added to the midPoint. I'm not sure. If someone could explain what i'm meant to be doing in this part that would be really grateful.

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• Writing a basic shader for large input files

  - by Zoltan Varadi

  I started writing a shader for my iOS app and instead of starting from scratch i used this tutorial here: http://www.raywenderlich.com/3664/opengl-es-2-0-for-iphone-tutorial I wrote an import function, first to import wavefront .obj models. My problem is that with I can't handle larger inputs (with a simple cube it was working). I realized that the indices array is an array of GLubyte values, which is unsigned char, so as a result i cant have more than 256 indexes. I modified it to GLuint, but then only get a blank screen. What else needs to me modified? p.s.: the source can be downloaded from here: http://d1xzuxjlafny7l.cloudfront.net/downloads/HelloOpenGL.zip

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• Is there such a thing as having too many private functions/methods?

  - by shovonr

  I understand the importance of well documented code. But I also understand the importance of self-documenting code. The easier it is to visually read a particular function, the faster we can move on during software maintenance. With that said, I like to separate big functions into other smaller ones. But I do so to a point where a class can have upwards of five of them just to serve one public method. Now multiply five private methods by five public ones, and you get around twenty-five hidden methods that are probably going to be called only once by those public ones. Sure, it's now easier to read those public methods, but I can't help but think that having too many functions is bad practice.

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• Quadratic Programming with Oracle R Enterprise

  - by Jeff Taylor-Oracle

       I wanted to use quadprog with ORE on a server running Oracle Solaris 11.2 on a Oracle SPARC T-4 server For background, see: Oracle SPARC T4-2 http://docs.oracle.com/cd/E23075_01/ Oracle Solaris 11.2 http://www.oracle.com/technetwork/server-storage/solaris11/overview/index.html quadprog: Functions to solve Quadratic Programming Problems http://cran.r-project.org/web/packages/quadprog/index.html Oracle R Enterprise 1.4 ("ORE") 1.4 http://www.oracle.com/technetwork/database/options/advanced-analytics/r-enterprise/ore-downloads-1502823.html Problem: path to Solaris Studio doesn't match my installation: $ ORE CMD INSTALL quadprog_1.5-5.tar.gz * installing to library \u2018/u01/app/oracle/product/12.1.0/dbhome_1/R/library\u2019 * installing *source* package \u2018quadprog\u2019 ... ** package \u2018quadprog\u2019 successfully unpacked and MD5 sums checked ** libs /opt/SunProd/studio12u3/solarisstudio12.3/bin/f95 -m64   -PIC  -g  -c aind.f -o aind.o bash: /opt/SunProd/studio12u3/solarisstudio12.3/bin/f95: No such file or directory *** Error code 1 make: Fatal error: Command failed for target `aind.o' ERROR: compilation failed for package \u2018quadprog\u2019 * removing \u2018/u01/app/oracle/product/12.1.0/dbhome_1/R/library/quadprog\u2019 $ ls -l /opt/solarisstudio12.3/bin/f95 lrwxrwxrwx   1 root     root          15 Aug 19 17:36 /opt/solarisstudio12.3/bin/f95 -> ../prod/bin/f90 Solution: a symbolic link: $ sudo mkdir -p /opt/SunProd/studio12u3 $ sudo ln -s /opt/solarisstudio12.3 /opt/SunProd/studio12u3/ Now, it is all good: $ ORE CMD INSTALL quadprog_1.5-5.tar.gz * installing to library \u2018/u01/app/oracle/product/12.1.0/dbhome_1/R/library\u2019 * installing *source* package \u2018quadprog\u2019 ... ** package \u2018quadprog\u2019 successfully unpacked and MD5 sums checked ** libs /opt/SunProd/studio12u3/solarisstudio12.3/bin/f95 -m64   -PIC  -g  -c aind.f -o aind.o /opt/SunProd/studio12u3/solarisstudio12.3/bin/ cc -xc99 -m64 -I/usr/lib/64/R/include -DNDEBUG -KPIC  -xlibmieee  -c init.c -o init.o /opt/SunProd/studio12u3/solarisstudio12.3/bin/f95 -m64  -PIC -g  -c -o solve.QP.compact.o solve.QP.compact.f /opt/SunProd/studio12u3/solarisstudio12.3/bin/f95 -m64  -PIC -g  -c -o solve.QP.o solve.QP.f /opt/SunProd/studio12u3/solarisstudio12.3/bin/f95 -m64   -PIC  -g  -c util.f -o util.o /opt/SunProd/studio12u3/solarisstudio12.3/bin/ cc -xc99 -m64 -G -o quadprog.so aind.o init.o solve.QP.compact.o solve.QP.o util.o -xlic_lib=sunperf -lsunmath -lifai -lsunimath -lfai -lfai2 -lfsumai -lfprodai -lfminlai -lfmaxlai -lfminvai -lfmaxvai -lfui -lfsu -lsunmath -lmtsk -lm -lifai -lsunimath -lfai -lfai2 -lfsumai -lfprodai -lfminlai -lfmaxlai -lfminvai -lfmaxvai -lfui -lfsu -lsunmath -lmtsk -lm -L/usr/lib/64/R/lib -lR installing to /u01/app/oracle/product/12.1.0/dbhome_1/R/library/quadprog/libs ** R ** preparing package for lazy loading ** help *** installing help indices   converting help for package \u2018quadprog\u2019     finding HTML links ... done     solve.QP                                html      solve.QP.compact                        html  ** building package indices ** testing if installed package can be loaded * DONE (quadprog) ====== Here is an example from http://cran.r-project.org/web/packages/quadprog/quadprog.pdf > require(quadprog) > Dmat <- matrix(0,3,3) > diag(Dmat) <- 1 > dvec <- c(0,5,0) > Amat <- matrix(c(-4,-3,0,2,1,0,0,-2,1),3,3) > bvec <- c(-8,2,0) > solve.QP(Dmat,dvec,Amat,bvec=bvec) $solution [1] 0.4761905 1.0476190 2.0952381 $value [1] -2.380952 $unconstrained.solution [1] 0 5 0 $iterations [1] 3 0 $Lagrangian [1] 0.0000000 0.2380952 2.0952381 $iact [1] 3 2 Here, the standard example is modified to work with Oracle R Enterprise require(ORE) ore.connect("my-name", "my-sid", "my-host", "my-pass", 1521) ore.doEval(   function () {     require(quadprog)   } ) ore.doEval(   function () {     Dmat <- matrix(0,3,3)     diag(Dmat) <- 1     dvec <- c(0,5,0)     Amat <- matrix(c(-4,-3,0,2,1,0,0,-2,1),3,3)     bvec <- c(-8,2,0)    solve.QP(Dmat,dvec,Amat,bvec=bvec)   } ) $solution [1] 0.4761905 1.0476190 2.0952381 $value [1] -2.380952 $unconstrained.solution [1] 0 5 0 $iterations [1] 3 0 $Lagrangian [1] 0.0000000 0.2380952 2.0952381 $iact [1] 3 2 Now I can combine the quadprog compute algorithms with the Oracle R Enterprise Database engine functionality: Scale to large datasets Access to tables, views, and external tables in the database, as well as those accessible through database links Use SQL query parallel execution Use in-database statistical and data mining functionality

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• PeopleTools 8.54 Pre-Release Notes Available

  - by Matthew Haavisto

  PeopleSoft's PeopleTools recently published pre-release notes for PeopleTools 8.54.  Pre-release notes provide more functional and technical details than the release value proposition. This document describes how enhancements function within the context of the greater business process. This added level of detail should enable project teams to answer the following questions: What delivered functionality will change? How will an upgrade or new implementation affect other systems? How will these changes affect the organization? After the project team has reviewed and analyzed the pre-release notes, business decision makers should be able to determine whether to allocate budget and initiate implementation plans. This document covers the following subjects: Platform support enhancements Development tools enhancements System administration tools enhancements Reporting and analytic tools enhancements Integration tools enhancements Lifecycle management tools enhancements Accessibility PeopleSoft Interaction Hub enhancements.

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• How to solve linear recurrences involving two functions?

  - by Aditya Bahuguna

  Actually I came across a question in Dynamic Programming where we need to find the number of ways to tile a 2 X N area with tiles of given dimensions.. Here is the problem statement Now after a bit of recurrence solving I came out with these. F(n) = F(n-1) + F(n-2) + 2G(n-1), and G(n) = G(n-1) + F(n-1) I know how to solve LR model where one function is there.For large N as is the case in the above problem we can do the matrix exponentiation and achieve O(k^3log(N)) time where k is the minimum number such that for all km F(n) does not depend on F(n-k). The method of solving linear recurrence with matrix exponentiation as it is given in that blog. Now for the LR involving two functions can anyone suggest an approach feasible enough for large N.

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• Futures/Monads vs Events

  - by c69

  So, the question is quite simple: in an application framework, when performance impact can be ignored (10-20 events per second at max), what is more maintainable and flexible to use as a preferred medium for communication between modules - Events or Futures/Promices/Monads ? Its often being said, that Events (pub/sub, mediator) allow loose-coupling and thus - more maintainable app... My experience deny this: once you have more that 20+ events - debugging becomes hard, and so is refactoring - because it is very hard to see: who, when and why uses what. Promices (i'm coding in javascript) are much uglier and dumber, than Events. But: you can clearly see connections between function calls, so application logic becomes more straight-forward. What i'm afraid. though, is that Promices will bring more hard-coupling with them... p.s: the answer does not have to be based on JS, experience from other functional languages is much welcome.

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• Should I leave href empty when implementing click events via jQuery?

  - by dreza

  Is it preferable to have # in a link's href attribute when I am implementing the click event via jQuery, or is it ok to leave href empty? i.e. <a id="myLink" href="#" /> vs <a id="myLink" href="" /> When I'm doing $("#myLink").on('click', function() { // do ajaxy stuff }); Although I understand the click event could be on a span or other such element I'm interested in this case for particular best practices when using an a tag.

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• Graphics problems: noise-like glitch, and screen freezes in Ubuntu 13.04

  - by user207253

  I have recently upgraded to 13.04 and am using unity. I am experiencing two intermittent problems with the graphics: 1) All or part of the screen is taken up by 'noise', which lasts for about a second, see screenshot: 2) The launcher panel freezes. I can still move the mouse and the keyboard responds to function keys (I can dim the screen), but I cannot select anything. At the moment I recover by ctr-alt-f1, and restarting lightdm. My computer is a Samsung Chronos 7 laptop, model NP700Z5C, with Intel HD 4000 graphics The same problems occur with lightdm and gdm. I have attempted to install the intel drivers (as the screenshot hints) but these are not indicated as additional drivers in software & updates so I'm not sure whether they are in use. Any suggestions?

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• Wordpress plugin installation error.

  - by Steve

  I'm trying to upload secure-wordpress.1.0.6, and I receive the following error: Warning: touch() [function.touch]: open_basedir restriction in effect. File(/abs_path/wordpress/tmp/secure-wordpress.tmp) is not within the allowed path(s): (/abs_path/:/abs_path/:/usr/local/lib/php:/tmp/php_upload) in /abs_path/public/www/wordpress/wp-admin/includes/file.php on line 199 Download failed. Could not create Temporary file. The /wp-content folder and all it's subfolders have 777 permission. I've added the following two lines to wp-config.php: putenv('TMPDIR='.ini_get('upload_tmp_dir') ); define('WP_TEMP_DIR', ABSPATH .'wp-content/uploads/'); What else should I try? I am using Wordpress 3.04 in a PHP 4.49 environment.

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• How to loop through a javascript object and check each key exists in a separate multidimensional object

  - by Paul Atkins

  I have 2 javascript objects and I am trying to loop through one object and check whether the key exists in a second multidimensional object going one level deeper each time. Here are the two objects var check = {'scope':'instance', 'item':'body', 'property': 'background'}; var values = {'instance': {'body' : {'background': '000000'}}}; b.map(check, function(key){ console.log(values[key]); }); How am I able to check 1 level deeper in the values object each time? What I am trying to do is check the values object as follows: 1st values['instance'] 2nd values['instance']['body'] 3rd values['instance']['body']['background'] Thanks

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• Sometimes my page can't access PHP session varible

  - by Anusha

  I am working on E-commerce Web Application, which is having users and permissions to them.. So according to their permission, For Ex: I am storing variable $chk = 'write' or $chk = 'read' on session and my condition is if ($chk == 'write') { // some function here to modify the page & its content // If true, then display SAVE button to save all changes made. } But, Sometimes my page cant access this variable, the value of $chk is unknown hence its not displaying SAVE button. But, it shows the button after refreshing the page or visiting sometime later. Can anyone help me to solve this.. Thanks in advance

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• HTML5 clicking objects in canvas

  - by Dave

  I have a function in my JS that gets the user's mouse click on the canvas. Now lets say I have a random shape on my canvas (really its a PNG image which is rectangular) but i don't want to include any alpha space. My issue lies with lets say i click some where and it involves a pixel of one of the images. The first issue is how do you work out the pixel location is an object on the map (and not the grass tiles behind). Secondly if i clicked said image, if each image contains its own unique information how do you process the click to load the correct data. Note I don't use libraries I personally prefer the raw method. Relying on libraries doesn't teach me much I find.

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• most efficient AABB vs Ray collision algorithms

  - by Asher Einhorn

  Is there a known 'most efficient' algorithm for AABB vs Ray collision detection? I recently stumbled accross Arvo's AABB vs Sphere collision algorithm, and I am wondering if there is a similarly noteworthy algorithm for this. One must have condition for this algorithm is that I need to have the option of querying the result for the distance from the ray's origin to the point of collision. having said this, if there is another, faster algorithm which does not return distance, then in addition to posting one that does, also posting that algorithm would be very helpful indeed. Please also state what the function's return argument is, and how you use it to return distance or a 'no-collision' case. For example, does it have an out parameter for the distance as well as a bool return value? or does it simply return a float with the distance, vs a value of -1 for no collision? (For those that don't know: AABB = Axis Aligned Bounding Box)

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• Mysql not starting - innodb not found

  - by Rob Guderian

  I have a fresh install of ubuntu 12.04 server edition and mysql server is not starting properly. I did a simple apt-get install apt-get install mysql-server But, it's failing with this error message root@test:~# mysqld 120618 20:57:32 [Warning] The syntax '--log-slow-queries' is deprecated and will be removed in a future release. Please use '--slow-query-log'/'--slow-query-log-file' instead. 120618 20:57:32 [Note] Plugin 'FEDERATED' is disabled. 120618 20:57:32 InnoDB: The InnoDB memory heap is disabled 120618 20:57:32 InnoDB: Mutexes and rw_locks use GCC atomic builtins 120618 20:57:32 InnoDB: Compressed tables use zlib 1.2.3.4 120618 20:57:32 InnoDB: Unrecognized value fdatasync for innodb_flush_method 120618 20:57:32 [ERROR] Plugin 'InnoDB' init function returned error. 120618 20:57:32 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 120618 20:57:32 [ERROR] Unknown/unsupported storage engine: InnoDB 120618 20:57:32 [ERROR] Aborting I can start the server with the "--skip-innodb --default-storage-engine=myisam" flags, but would like to use innodb. Does anyone know what the issue here is?

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• Redirect error in Google Webmaster Tools report

  - by Aurelio De Rosa

  I built a CMS and I used it to create the following website http://www.tkdmontecatini.com . After some days, Google Webmaster Tools started to give me several "Redirect error" on some pages like the follows: http://www.tkdmontecatini.com/it/photogallery http://www.tkdmontecatini.com/it/pagina/9/Informazioni/Corsi/Chi-Siamo http://www.tkdmontecatini.com/it/pagina/2/Informazioni/Eventi/Eventi The funny things are: If I access those links from a browser, it's all right and I've not redirect loops or other similar issues If I use the "Fetch as Googlebot" function, I get a great "Success" result Question: Any idea of why this happens and how can I fix it?

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• How can I really master a programming language?

  - by cprogcr

  I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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• Dash doesn't recognize that application is installed

  - by Calixte

  I've installed Geary from the software center, but I can't launch it from the Dash nor did I manage to create an app icon on the Launcher. The Software center has no problem seeing that the app is installed (see screenshot) Running the command "geary" will launch the app. Is there any way I can force the Dash to function properly? Thanks, Calixte PS: Does anyone know what this problem is related to? I tried re-installing the app and restarting the computer but that has no effect at all. I have practically installed nothing on this computer, so I can't imagine what app could interfere with the Dash

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• jquery slidetoggle expands and collapses straight away [migrated]

  - by Floran

  Please see here: http://www.wunderwedding.com/weddingvenues/search On the left side there's a filter 'show more cities...' When it's clicked I want to show more cities. But right now when it's clicked the box expands and IMMEDIATELY collapses again. I dont know what Im doing wrong. This is the code for show/hide: $("#toggle_cities").click(function () { if ($("#facets_city").is(":visible")) { $("#toggle_cities").text('toon meer steden...'); } else { $("#toggle_cities").text('toon minder steden...'); } $("#facets_city").slideToggle("slow"); });

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• Interview question ranking FizzBuzz (1), implementing malloc (10)

  - by blrs

  I'd like to have your opinion on the difficulty of the following interview question: Find the subarray with maximum sum in an array of integers in O(n) time. This trivial sounding problem was made famous by Jon Bentley in his Programming Pearls where he uses it to demonstrate algorithm design techniques. On a scale of 1-10, 1 being the FizzBuzz (or HoppityHop) test and 10 being implement the C stdlib function malloc(), how would you rank the above problem? I think the people who can best answer this question are those who have read Programming Pearls and have tried to solve this problem on their own. To motivate those who haven't, 'Programming Pearls' gets featured many times in the 'Top 10 programming books' list.

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• Python lower_case_with_underscores style convention: underscores not popular?

  - by squirrel

  PEP8 recommends using lowercase, with words separated by underscores as necessary to improve readability for variable and function names. I've seen this interpreted as lower_case_with_underscores by most people, although in practice and in Python's native methods it seems like lowercasewithoutunderscores is more popular. It seems like following PEP8 strictly would be awkward since it seems to suggest mixing both lower_case_with_underscores and lowercasewithoutunderscores, which would be inconsistent. What is your interpretation of PEP8's variable names, and what do you actually use in practice? (Personally, I like lowerCamelCase as a compromise between readability and ease of typing.)

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• Unity Search Not Working

  - by greggory.hz

  When I attempt a search after hitting Super, the spinner spins, but no results come up once the spinning stops. I'm not sure what changed that caused this. I had a newer kernel installed, but I have since reverted back to the default kernel. I also followed this guide: http://www.webupd8.org/2011/04/how-to-reset-unity-launcher-icons-or.html Alt+F2 does not work. The packages unity-place-applications and unity-place-files are installed. But search still doesn't function correctly.

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