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  • How should I generate and store the boundries of a cave?

    - by Bob Roberts
    I am making a small cave copter game (seriously, where did this type of game come from anyway) and I am trying to figure out how to make and store the procedural generated walls. I am thinking about creating the walls by randomly picking two points away from the center of the screen. They will be no closer than the height of helicopter and no further than the edge of the screen, weighted to prefer to go in the same direction as the point prior so I end up with stalactites and stalagmites and not just noise, at set intervals of distance. To store, perhaps parallel arrays/lists, one for distance from center to top screen and one for distance from center to bottom. Am I way off base with my thinking? I just want the cave to be varied and challenging, I just have never worked with generating data like this. Edit: Woah, I just realized that my idea would lead to a player being able to stay in the middle of the screen and win. That isn't right at all. So the very basis of how I was going to generate is wrong. Edit 2: I also realized I left out a very crucial point. Part of the mechanics of the game will let the player go backwards therefor the data structure should be continuous.

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  • Antenna Aligner part 1: In the beginning.

    - by Chris George
    Picture the scene, it's 9pm, I'm in my caravan (yes I know, I've heard all the jokes!) with my family and I'm trying to tune the tv by moving the aerial, retuning, moving the aerial again, retuning... 45 mins and much cursing later I succeed. Surely there must be an easier way than this? Aha, an app; there must be an app for that? So I search in the AppStore for such an app, but curiously drew a blank. Then the seeds of the idea started to grow. I can code, I work in a software house with lots of very clever people, surely I can make an app that points to the nearest digital tv transmitter! Not having looked into app development before, I investigated how one goes about making an iPhone app and was quickly greeted by a now familiar answer "Buy a mac!". That was not an option for many reasons, mostly wife related! My dreams were starting to fade until one of my colleagues pointed out that within Red Gate, the very company I work for, there was on-going development on a piece of software that would allow me to write an app using Visual Studio on a Windows machine, Nomad! Once I signed up for the beta program I got to work learning the Jquery mobile / Phonegap framework. Within a couple of hours I had written (in Visual Studio), built in the cloud (using Nomad) and published (via TestFlight) my first iPhone app onto my iPhone ! It didn't do much, but it was a step in the right direction. To be continued...

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  • After login I only get a terminal window

    - by Ambidex
    First of, let me tell you I'm a n00b at ubuntu. I have updated my Ubuntu mediacenter to a later version of ubuntu, currently at 12.04. I'm working through a lot of updates to get to the latest. But since my first update I got the new login screen (lightdm?) and my autologin wasen't working anymore. So I Googled how I could make lightdm autologin. I've managed this by making my /etc/lightdm/lightdm.conf look as follows: [SeatDefaults] greeter-session=unity-greeter user-session=ubuntu autologin-user=my_user autologin-userutologin-user=-timeout=0 Which seemed to work... But now that it automatically logs in, I seem to get the following type of screen (through nomachine remote desktop client): Sorry... I am unable to post my screenshot here because I do not have the 10 reputation points in askubuntu yet.... darn it... But the screen has a terminal at the top left of the screen (not an actual "window"), and the ubuntu loading screen is still behind it. I've tried running startx as you can see. But, this seems to actually be x server. But if I run unity --reset, it seems that a lot of the desktop gets restored, but... with a lot of errors and warnings and the next time I boot, it's the same story all over again. Also, when I close the terminal window after getting my desktop back, I get thrown back at the login screen. Please bear with my lack of knowledge of ubuntu and it's underlying unix. I thank you in advance.

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  • Which reference provides your definition of "elegant" or "beautiful" code?

    - by Donnied
    This question is phrased in a very specific way - it asks for references. There was a similar question posted which was closed because it was considered a duplicate to a good code question. The Programmers FAQ points out that answers should have references - or its just an unproductive sharing of (seemingly) baseless opinions. There is a difference between shortest code and most elegant code. This becomes clear in several seminal texts: Dijkstra, E. W. (1972). The humble programmer. Communications of the ACM, 15(10), 859–866. Kernighan, B. W., & Plauger, P. J. (1974). Programming style: Examples and counterexamples. ACM Comput. Surv., 6(4), 303–319. Knuth, D. E. (1984). Literate programming. The Computer Journal, 27(2), 97–111. doi:10.1093/comjnl/27.2.97 They all note the importance of clarity over brevity. Kernighan & Plauger (1974) provide descriptions of "good" code, but "good code" is certainly not synonymous with "elegant". Knuth (1984) describes the impo rtance of exposition and "excellence of style" to elegant programs. He cites Hoare - who describes that code should be self documenting. Dijkstra (1972) indicates that beautiful programs optimize efficiency but are not opaque. This sort of conversation is qulaitatively different than a random sharing of opinions. Therefore, the question - Which reference provides your definition of "elegant" or "beautiful" code? "Which *reference*" is not subjective - anything else will most likely shut the thread down, so please supply *references* not opinions.

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  • How to start a high school Java/Android development club for 13-17 year olds

    - by PaulHurleyuk
    My wife is a high school maths teacher, and is considering starting a programming club for 13-17 years olds who show an interest. Their interest seems to be around Apps and Android which I have little experience of. The kids would be (presumably) interested in programming, and have a fairly high level of computing knowledge. We would provide them with resources and some knowledge, but hopefully a lot would be self guided. I'm hoping stack overflow'ers can provide some tips or starting points. Specific things I think I'll need are; A development Environment; Currently I'm looking towards Java and Android, developed in Eclipse, probably installed on donated older hardware Some initial direction; There seem to be a plethora or 'start android' tutorials, so some recommendations for good ones are valuable, as are recommended paper books A Target; Some final project they should be shooting for A Route; This is where I'm most stuck, how to lead them through the required Java concepts and learning they would need Some related questions already out there Language+IDE for teaching high school students? Teaching "web design/development" to high-school home-school group. Good sources? How can I bootstrap a software development community at my school?

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  • IoT Wearables

    - by Tom Caldecott-Oracle
    A Reprint from The Java Source Blog By Tori Wieldt on Aug 20, 2014 Wearables are a subset of the Internet of Things that has gained a lot of attention. Wearables can monitor your infant's heartrate, open your front door, or warn you when someone's trying to hack your enterprise network. From Devoxx UK to Oracle OpenWorld to Devoxx4kids, everyone seems to be doing something with wearables.  In this video, John McLear introduces the NFC Ring. It can be used to unlock doors, mobile phones, transfer information and link people. The software for developers is open source, so get coding! If you are coming to JavaOne or Oracle OpenWorld, join us for Dress Code 2.0, a wearables meetup. Put on your best wearables gear and come hang out with the Oracle Applications User Experience team and friends at the OTN Lounge. We'll discuss the finer points of use cases, APIs, integrations, UX design, and fashion and style considerations for wearable tech development. There will be gifts for attendees sporting wearable tech, while supplies last. What: Dress Code 2.0: A Wearables Meetup When: Tuesday, 30-September-2014, 4-6 PM Where: OTN Lounge at Oracle OpenWorld IoT - Wearable Resources The IoT Community on Java.net Wearables in the World of Enterprise Applications? Yep. The Paradox of Wearable Technologies Conference: Wearable Sensors and Electronics (Santa Clara, USA) Devoxx4Kids Workshop for Youth: Wearable tech! (Mountain View, USA)

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  • How do I render only part of a texture to a point sprite in OpenGL ES for Android?

    - by nbolton
    Using the libgdx framework, I've figured out how to render a texture to a point sprite. The problem is, it renders the entire texture to the point sprite, where I only want a small part of it (since it's an isometric tile image). Here's a snippet from some demo code I wrote... create() { renderer = new ImmediateModeRenderer(); tiles = Gdx.graphics.newTexture( Gdx.files.internal("data/tiles2.png"), TextureFilter.MipMap, TextureFilter.Linear, TextureWrap.ClampToEdge, TextureWrap.ClampToEdge); Gdx.gl.glClearColor(0.6f, 0.7f, 0.9f, 1); Gdx.gl.glEnable(GL10.GL_TEXTURE_2D); Gdx.gl.glEnable(GL11.GL_POINT_SPRITE_OES); Gdx.gl11.glTexEnvi( GL11.GL_POINT_SPRITE_OES, GL11.GL_COORD_REPLACE_OES, GL11.GL_TRUE); Gdx.gl10.glPointSize(s); tiles.bind(); } render() { Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); renderer.begin(GL10.GL_POINTS); // render 3 point sprites at various 3d points renderer.vertex(-.1f, 0, -.1f); renderer.vertex(0, 0, 0); renderer.vertex(.1f, 0, .1f); // ... more vertices here if needed (one for each sprite) ... renderer.end(); }

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  • White screen with pointer after removing Unity

    - by Sameer Pandit
    I have the same problem . I am a newbie. I added the repository with sudo add apt-get-repository ppa:canonical-dx-team/une then i went to ubuntu software center and installed "unity interface of ubuntu netbook edition" . after installing i found a problem with User interface as it kept on flashing when mouse points to side panel . so i decided to remove it . I removed it form Ubuntu software center . there were other unity related apps installed , but i did not remove then as i had no idea what they were about . Now i ended up with a blank white screen with mouse pointer whenever i login. though i m able to login using gdm , but the screen is blank white. I tried to these commands also sudo apt-get remove gnome-shell sudo apt-get remove unity sudo restart gdm but they did not work at all i also tried sudo dpkg-reconfigure xserver-xorg it too did not work. Note:I donot have any sort of graphics card or video card on my pc please help !!!

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  • Does F# kill C++?

    - by MarkPearl
    Okay, so the title may be a little misleading… but I am currently travelling and so have had very little time and access to resources to do much fsharping – this has meant that I am right now missing my favourite new language. I was interested to see this post on Stack Overflow this evening concerning the performance of the F# language. The person posing the question asked 8 key points about the F# language, namely… How well does it do floating-point? Does it allow vector instructions How friendly is it towards optimizing compilers? How big a memory foot print does it have? Does it allow fine-grained control over memory locality? Does it have capacity for distributed memory processors, for example Cray? What features does it have that may be of interest to computational science where heavy number processing is involved? Are there actual scientific computing implementations that use it? Now, I don’t have much time to look into a decent response and to be honest I don’t know half of the answers to what he is asking, but it was interesting to see what was put up as an answer so far and would be interesting to get other peoples feedback on these questions if they know of anything other than what has been covered in the answer section already.

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  • How to write constructors which might fail to properly instantiate an object

    - by whitman
    Sometimes you need to write a constructor which can fail. For instance, say I want to instantiate an object with a file path, something like obj = new Object("/home/user/foo_file") As long as the path points to an appropriate file everything's fine. But if the string is not a valid path things should break. But how? You could: 1. throw an exception 2. return null object (if your programming language allows constructors to return values) 3. return a valid object but with a flag indicating that its path wasn't set properly (ugh) 4. others? I assume that the "best practices" of various programming languages would implement this differently. For instance I think ObjC prefers (2). But (2) would be impossible to implement in C++ where constructors must have void as a return type. In that case I take it that (1) is used. In your programming language of choice can you show how you'd handle this problem and explain why?

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  • Technical Integration Roadmap for OBI11g and Oracle Hyperion EPM System

    - by Mike.Hallett(at)Oracle-BI&EPM
    There is an excellent technical whitepaper on the integration roadmap for Oracle business intelligence enterprise edition and the Oracle Hyperion enterprise performance management system  (download at this link).  This document lists the integration points among all current releases of Oracle BI EE with EPM System releases: with live links to other relevant documentation also provided. You may also be interested in the overall Hyperion EPM System Documentation Resources which can be found from the Doc Portal. And, there are two new tools for EPM @ MyOracleSupport  {this needs your oracle logon} : Cumulative Feature Overview Tool This new tool offers a simple way to determine the features developed between releases to assist you in your upgrade implementations. The tool helps you to plan your upgrades by providing concise descriptions of new and enhanced solutions and functionality that are added between your current and target releases. With the Cumulative Feature Overview Tool, you can quickly and easily find information about new features for each EPM System product. Defects Fixed Finder Tool This new tool provides an efficient way to review the defects fixed in patch set updates, patch set exceptions, and patch sets for major releases, starting with Release 11.1.1. The tool helps you plan patch implementations by providing concise descriptions of defects fixed after your current release. The Defects Fixed Finder enables you to easily find information about defects fixed for each EPM System product.

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  • Logistics of code reuse (OOP)

    - by Ominus
    One of the driving points behind OOP is code reuse. I am curious about the actual logistics of this and how others both in team or solo handle it. For example lets say you have 5 projects you have worked on and between them you have a ton of classes that you think would be useful in other projects. How do you store them? Are they just in the normal project repository or do you break out the relevant classes and have them (as now copies) in another unique source repository that only houses code pieces that are intended to be reused? How do you go about finding or even knowing that there is a good piece of code out there that you should reuse? It's easier if your solo because you remember that you have coded something similar but even then it becomes kind of a stretch. If there is some way that you are storing these pieces of code do you then also have them indexed and searchable by tag or something. I fear that it just boils down to some tribal knowledge that you just know that for situation A i need solution B and we have a good piece of code that already can help here. A bit verbose but I hope you get what I am aiming at. If you think of a better way to make the question clearer please have at it :) TIA!

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  • How can I pass referrer header from my https domain to http domains?

    - by nutcracker
    My website is 100% https. I have links to other http domains. The referrer header is not set when linking from a https page to a http page. From http://en.wikipedia.org/wiki/HTTP_referrer If a website is accessed from a HTTP Secure (HTTPS) connection and a link points to anywhere except another secure location, then the referer field is not sent. I would prefer that other domains can see the referrer so that they know that traffic comes from my domain. Is there a way to force this header or is there another solution? Update I've done some basic testing using a redirect: http page -- link to http --> 301 redirect --> http page = referrer intact https page -- link to https --> 301 redirect --> http page = referrer blank https page -- link to http --> 301 redirect --> http page = referrer blank https page -- link to http --> 302 redirect --> http page = referrer blank The referrer is lost when linking from a https page to a http redirect page on my own domain. So there is no referrer on the redirect.

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  • An Interview with JavaOne Rock Star Martijn Verburg

    - by Janice J. Heiss
    An interview with JavaOne Rock Star Martijn Verburg, by yours truly, titled “Challenging the Diabolical Developer: A Conversation with JavaOne Rock Star Martijn Verburg,” is now up on otn/java. Verburg, one of the leading movers and shakers in the Java community, is well known for his ‘diabolical developer” talks at JavaOne where he uncovers some of the worst practices that Java developers are prone to. He mentions a few in the interview: * “A lack of communication: Software development is far more a social activity than a technical one; most projects fail because of communication issues and social dynamics, not because of a bad technical decision. Sadly, many developers never learn this lesson.* No source control: Some developers simply store code in local file systems and e-mail the code in order to integrate their changes; yes, this still happens.* Design-driven design: Some developers are inclined to cram every design pattern from the Gang of Four (GoF) book into their projects. Of course, by that stage, they've actually forgotten why they're building the software in the first place.” He points to a couple of core assumptions and confusions that lead to trouble: “One is that developers think that the JVM is a magic box that will clean up their memory and make their code run fast, as well as make them cups of coffee. The JVM does help in a lot of cases, but bad code can and will still lead to terrible results! The other trend is to try to force Java (the language) to do something it's not very good at, such as rapid Web development. So you get a proliferation of overly complex frameworks, libraries, and techniques trying to get around the fact that Java is a monolithic, statically typed, compiled, OO environment. It's not a Golden Hammer!” Verburg has many insightful things to say about how to keep a Java User Group (JUG) going, about the “Adopt a JSR” program, bugathons, and much more. Check out the article here.

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  • Ways to dynamically render a real world 3d environment in Unity3D

    - by Jake M
    Using Unity3D and C# I am attempting to display a 3d version of a real world location. Inside my Unity3D app, the user will specify the GPS coordinates of a location, then my app will have to generate a 3d plane(anything doesn't have to be a plane) of that location. The plane will show a 500 metre by 500 metre 3d snapshot of that location. How would you suggest I achieve this in Unity3D? What methodology would you use to achieve this? NOTE: I understand that this is a very difficult endevour(to render real world locations dynamically in Unity3d) so I expect to perform many actions to achieve this. I just don't know of all the technologies out there and which would be best for my needs For example: Suggested methodology 1: Prompt user to specify GPS coords Use Google earth API and HTTP to programmatically obtain a .khm file describing that location(Not sure if google earth provides that capability does it?) Unzip the .khm so I have the .dae file Convert that file to a .3ds file using ??? third party converter(is there a converter that exists?) Import .3ds into Unity3D at runtime as a plane(is this possible)? Suggested methodology 2: Prompt user to specify GPS coords Use Google earth API and HTTP to programmatically obtain a .khm file describing that location(Not sure if google earth provides that capability does it?) Unzip the .khm so I have the .dae file Parse .dae file using my own C# parser I will write(do you think its possible to write a .dae parser that can parse the .dae into an array of Vector3 that describe the height map of that location?) Dynamically create a plane in Unity3D and populate it with my array/list of Vector3 points(is it possible to create a plane this way?) Maybe I am meant to create a mesh instead of a plane? Can you think of any other ways I could render a real world 3d environment in Unity3D?

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  • Bounding volume hierarchy - linked nodes (linear model)

    - by teodron
    The scenario A chain of points: (Pi)i=0,N where Pi is linked to its direct neighbours (Pi-1 and Pi+1). The goal: perform efficient collision detection between any two, non-adjacent links: (PiPi+1) vs. (PjPj+1). The question: it's highly recommended in all works treating this subject of collision detection to use a broad phase and to implement it via a bounding volume hierarchy. For a chain made out of Pi nodes, it can look like this: I imagine the big blue sphere to contain all links, the green half of them, the reds a quarter and so on (the picture is not accurate, but it's there to help understand the question). What I do not understand is: How can such a hierarchy speed up computations between segments collision pairs if one has to update it for a deformable linear object such as a chain/wire/etc. each frame? More clearly, what is the actual principle of collision detection broad phases in this particular case/ how can it work when the actual computation of bounding spheres is in itself a time consuming task and has to be done (since the geometry changes) in each frame update? I think I am missing a key point - if we look at the picture where the chain is in a spiral pose, we see that most spheres are already contained within half of others or do intersect them.. it's odd if this is the way it should work.

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  • XNA 4.0 2D sidescroller variable terrain heightmap for walking/collision

    - by JiminyCricket
    I've been fooling around with moving on sloped tiles in XNA and it is semi-working but not completely satisfactory. I also have been thinking that having sets of predetermined slopes might not give me terrain that looks "organic" enough. There is also the problem of having to construct several different types of tile for each slope when they're chained together (only 45 degree tiles will chain perfectly as I understand it). I had thought of somehow scanning for connected chains of sloped tiles and treating it as a new large triangle, as I was having trouble with glitching at the edges where sloped tiles connect. But, this leads back to the problem of limiting the curvature of the terrain. So...what I'd like to do now is create a simple image or texture of the terrain of a level (or section of the level) and generate a simple heightmap (of the Y's for each X) for the terrain. The player's Y position would then just be updated based on their X position. Is there a simple way of doing this (or a better way of solving this problem)? The main problem I can see with this method is the case where there are areas above the ground that can be walked on. Maybe there is a way to just map all walkable ground areas? I've been looking at this helpful bit of code: http://thirdpartyninjas.com/blog/2010/07/28/sloped-platform-collision/ but need a way to generate the actual points/vectors.

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  • Experiencing the New Social Enterprise

    - by kellsey.ruppel
    Social media and networking tools, popularly known as Web 2.0 technologies, are rapidly transforming user expectations of enterprise systems. Many organizations are investing in these new tools to cultivate a modern user experience in an “Enterprise 2.0” environment that unlocks the full potential of traditional IT systems and fosters collaboration in key business processes. Here are some key points and takeaways from some of the keynotes yesterday at the Enterprise 2.0 Conference: Social networks continue to forge complex connections between people, processes, and content, facilitating collaboration and the sharing of information The customer of today lives inside of Facebook, on your web, or has an app for that – and they have a question – and want an answer NOW Empowered employees are able to connect to colleagues, build relationships, develop expertise, self-select projects of interest to them, and expand skill sets well beyond their formal roles A fundamental promise of Enterprise 2.0 is that ideas will be generated and shared by everyone across the organization, leading to increased innovation, agility, and competitive advantage How well is your organizating delivering on these concepts? Are you able to successfully bring together people, processes and content? Are you providing the social tools your employees want and need? Are you experiencing the new social enterprise?

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  • Installing Visual Studio 2010 Service Pack 1

    - by Martin Hinshelwood
    As has become customary when the product team releases a new patch, SP or version I like to document the install. This post seams almost redundant as I had no problems, but I think that is as valuable to other thinking of installing the Service Pack as all the problems that we sometimes get. As per Brian's post I am Installing Visual Studio Team Foundation Server Service Pack 1 first and indeed as this is a single server local deployment I need to install both. If I only install one it will leave the other product broken. Figure: Hopefully this will be more uneventful It takes a little while for your system to be checked to see what components need updating. On my main computer this was pretty quick, but on the laptop it took some time. Figure: There are a lot of components to update With this update also comes an update to .NET as well as many other components. Figure: I downloaded the full 1.5GB’s, but you could do a web install It depends on how good you internet connection is to how long it would take to download, but as I am now in the US I decided not to trust the internet connection speeds. It took around 30-40 minutes to download the full thing which is a little slow. Figure: I did not need to download, but that would increase the install time So on my main computer again this was fast, but again on my netbook this took a little while. Figure: The actual install took around 30-40 minutes (2 hours on netbook) I was pretty impressed with the speed of the install, and as Team Explore is now out of the box with Visual Studio 2010 I don’t get the problem of the SP being installed before Team Explorer and having a disjointed experience Figure: As I suspected, no problems with the install Figure: Checking in Visual Studio shows that all the servicing points were successful This was an easy experience even if the SP was over 1.5GB’s to download Hopefully I will be discovering things that work better for a good while to come, as well as not seeing holes in the product that I had no encountered yet. What were your experiences of installing Visual Studio 2010 Service pack 1?

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  • starting up with VPS or cloud hosting? [closed]

    - by FlyOn
    Possible Duplicate: How to find web hosting that meets my requirements? Summary: I want to start hosting my product. I'd like to register domains (at some point). I'm a linux beginner. Thinking about scalability and price, I'm thinking am I better off on a VPN to get started or would some form of cloud hosting be better (not being familiar with either). Full question: I'm creating a product where people can create their own 3D representations of whatever data / info they have, and (re)organise that data. The product is coming along beautifully on my local environment, but it's about time I start getting some form of hosting ready, and I could really use some advice where / how to get started: I'd like people to be able to move/register their own domains on my server. I could start without this just to demo the product, but it would be the very first on the todo list. I'd like to automatically copy some files / install databases etc for each domain. I probably want to see if I can let users manage their own subdomains at some points, but for now: I'd like start as simple as possible. I've always on a windows machine, so my linux experience is quite basic. I really don't mind getting into it, but I'm thinking it's better to get my product out first of all and see where to go from there. Although... I'd like things to be scalable. If I set up some reseller VPN now which only scales to 100 domains or so, which means I have to set up something else / move again when I pass that level, or which means that I'm in trouble if I suddenly get lots of new customers... hmm. Finally, I need to start cheap. I'm putting all I have into starting this company, and live on very little. So before I have any customers, 50 dollars a month is a fair bit and 100 dollars a month may be too much. If anyone has some tips to help get me started I'd be really grateful.

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  • Assigning valid moves on board game

    - by Kunal4536
    I am making a board game in unity 4.3 2d similar to checkers. I have added an empty object to all the points where player can move and added a box collider to each empty object.I attached a click to move script to each player token. Now I want to assign valid moves. e.g. as shown in picture... Players can only move on vertex of each square.Player can only move to adjacent vertex.Thus it can only move from red spot to yellow and cannot move to blue spot.There is another condition which is : if there is the token of another player at the yellow spot then the player cannot move to that spot. Instead it will have to go from red to green spot. How can I find the valid moves of the player by scripting. I have another problem with click to move. When I click all the objects move to that position.But I only want to move a single token. So what can i add to script to select a specific object and then click to move the specific object.Here is my script for click to move. var obj:Transform; private var hitPoint : Vector3; private var move: boolean = false; private var startTime:float; var speed = 1; function Update () { if(Input.GetKeyDown(KeyCode.Mouse0)) { var hit : RaycastHit; // no point storing this really var ray = Camera.main.ScreenPointToRay (Input.mousePosition); if (Physics.Raycast (ray, hit, 10000)) { hitPoint = hit.point; move = true; startTime = Time.time; } } if(move) { obj.position = Vector3.Lerp(obj.position, hitPoint, Time.deltaTime * speed); if(obj.position == hitPoint) { move = false; } } }`

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  • Calculating 3d rotation around random axis

    - by mitim
    This is actually a solved problem, but I want to understand why my original method didn't work (hoping someone with more knowledge can explain). (Keep in mind, I've not very experienced in 3d programming, having only played with the very basic for a little bit...nor do I have a lot of mathematical experience in this area). I wanted to animate a point rotating around another point at a random axis, say a 45 degrees along the y axis (think of an electron around a nucleus). I know how to rotate using the transform matrix along the X, Y and Z axis, but not an arbitrary (45 degree) axis. Eventually after some research I found a suggestion: Rotate the point by -45 degrees around the Z so that it is aligned. Then rotate by some increment along the Y axis, then rotate it back +45 degrees for every frame tick. While this certainly worked, I felt that it seemed to be more work then needed (too many method calls, math, etc) and would probably be pretty slow at runtime with many points to deal with. I thought maybe it was possible to combine all the rotation matrixes involve into 1 rotation matrix and use that as a single operation. Something like: [ cos(-45) -sin(-45) 0] [ sin(-45) cos(-45) 0] rotate by -45 along Z [ 0 0 1] multiply by [ cos(2) 0 -sin(2)] [ 0 1 0 ] rotate by 2 degrees (my increment) along Y [ sin(2) 0 cos(2)] then multiply that result by (in that order) [ cos(45) -sin(45) 0] [ sin(45) cos(45) 0] rotate by 45 along Z [ 0 0 1] I get 1 mess of a matrix of numbers (since I was working with unknowns and 2 angles), but I felt like it should work. It did not and I found a solution on wiki using a different matirx, but that is something else. I'm not sure if maybe I made an error in multiplying, but my question is: this is actually a viable way to solve the problem, to take all the separate transformations, combine them via multiplying, then use that or not?

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  • Adjust sprite bounds of the visible part of texture

    - by Crazy D0G
    Is there any way to adjust the boundaries of the visible part of the sprite? To make it easier to understand: I have a texture, such as shown at figure 1. Then I break it into pieces and fill the resulting fragments using PRKit (wood texture on figure 2 and 3). But the resulting fragments have the transparent (green color on figure 2 and 3) and when creating a sprite from the fragments they have the size of the initial texture. Is there a way to get rid of this transparency and to adjust the size of the visible part (wood texture), openGL or cocos2d-x means? Maybe it help - draw() method from PRKit: void PRFilledPolygon::draw() { //CCNode::draw(); glDisableClientState(GL_COLOR_ARRAY); // we have a pointer to vertex points so enable client state glBindTexture(GL_TEXTURE_2D, texture->getName()); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ONE_MINUS_SRC_ALPHA); glVertexPointer(2, GL_FLOAT, 0, areaTrianglePoints); glTexCoordPointer(2, GL_FLOAT, 0, textureCoordinates); glDrawArrays(GL_TRIANGLES, 0, areaTrianglePointCount); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); //Restore texture matrix and switch back to modelview matrix glEnableClientState(GL_COLOR_ARRAY);}

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  • How to Deliberately Practice Software Engineering?

    - by JasCav
    I just finished reading this recent article. It's a very interesting read, and it makes some great points. The point that specifically jumped out at me was this: The difference was in how they spent this [equal] time. The elite players were spending almost three times more hours than the average players on deliberate practice — the uncomfortable, methodical work of stretching your ability. This article (if you care not to read it) is discussing violin players. Of course, being a software engineer, my mind turned towards software ability. Granted, there are some very naturally talented individuals out there, but time and time again, it is those folks who stretch their abilities through deliberate practice that really become exceptional at their craft. My question is - how would one go about practicing the "scales" of software engineering and computer science? When I practice the piano, I will spend more of my time on scales and less on a fun song. How can I do the same in developing software? To head off early answers, I don't feel that "work on an open source project," and similar answers, is really right. Sure...that can improve your skills, but you could just as easily get stuck focusing on something that is unimportant to your craft as a whole. It can become the equivalent of learning "Twinkle Twinkle Little Star" and never being able to play Chopin. So, again, I ask - how would you suggest that someone deliberately practice software engineering?

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  • Discovering Your Project

    - by Tim Murphy
    The discovery phase of any project is both exciting and critical to the project’s success.  There are several key points that you need to keep in mind as you navigate this process. The first thing you need to understand is who the players in the project are and what their motivations are for the project.  Leaving out a key stakeholder in the resulting product is one of the easiest ways to doom your project to fail.  The better the quality of the input you have at this early phase the better chance you will have of creating a well accepted deliverable. The next task you should tackle is to gather the goals for the project.  Specifically, what does the company expect to get for the money they are about to layout.  This seems like a common sense task, but you would be surprised how many teams to straight to building the system.  Even if you are following an agile methodology I believe that this is critical. Inventorying the resources that already exists gives you an idea what you are going to have to build and what you can leverage at lower risk.  This list should include documentation, servers, code repositories, databases, languages, security systems and supporting teams.  All of these are “resources” that can effect the cost and delivery schedule of your project. Finally, you need to verify what you have found and documented with the stakeholders and subject matter experts.  Documentation that has not been reviewed is actually a list of assumptions and we all know that assumptions are the mother of all screw ups. If you give the discovery phase of your project the attention that it deserves your project has a much better chance of success. I would love to hear what other people find important for this phase.  Please leave comments on this post so we can share the knowledge. del.icio.us Tags: Project discovery,documentation,business analysis,architecture

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