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• Google I/O 2010 - Google Wave Media APIs

  Google I/O 2010 - Google Wave Media APIs Google I/O 2010 - Google Wave Media APIs: Attachments can surf too! Wave 201 Seth Covitz, Jimin Li, Phil Liao Google Wave is used by diverse groups to communicate and collaborate on projects from work to school to plain old having fun. To make users even more productive, we are providing capabilities that enable them to collaborate on and around any piece of third-party content (eg attachments). In this session, we will introduce the Wave Media APIs which enable robots and gadgets to create, access, and modify third-party content in Wave. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 5 0 ratings Time: 41:04 More in Science & Technology

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• Google I/O 2010 - Keynote Day 1

  Google I/O 2010 - Keynote Day 1 Google I/O 2010 - Keynote Day 1 Video footage from Day 1 keynote at Google I/O 2010 Vic Gundotra, Engineering Vice President, Google Sundar Pichai, Vice President, Product Management, Google Charles Pritchard, Founder, MugTug Jim Lanzone, CEO, Clicker Mike Shaver, VP Engineering, Mozilla Corporation Håkon Wium Lie, CTO, Opera Software Kevin Lynch, CTO, Adobe Systems Terry McDonell, Editor, Sports Illustrated Group Lars Rasmussen, Manager, Google Wave David Glazer, Engineering Director, Google Paul Maritz, President & CEO, VMware Ben Alex, Senior Staff Engineer, SpringSource Division of VMware, Bruce Johnson, Engineering Director, Google Kevin Gibbs, Software Engineer, Google For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 2 1 ratings Time: 02:05:08 More in Science & Technology

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• Calculating collision force with AfterCollision/NormalImpulse is unreliable when IgnoreCCD = false?

  - by Michael

  I'm using Farseer Physics Engine 3.3.1 in a very simple XNA 4 test game. (Note: I'm also tagging this Box2D, because Farseer is a direct port of Box2D and I will happily accept Box2D answers that solve this problem.) In this game, I'm creating two bodies. The first body is created using BodyFactory.CreateCircle and BodyType.Dynamic. This body can be moved around using the keyboard (which sets Body.LinearVelocity). The second body is created using BodyFactory.CreateRectangle and BodyType.Static. This body is static and never moves. Then I'm using this code to calculate the force of collision when the two bodies collide: staticBody.FixtureList[0].AfterCollision += new AfterCollisionEventHandler(AfterCollision); protected void AfterCollision(Fixture fixtureA, Fixture fixtureB, Contact contact) { float maxImpulse = 0f; for (int i = 0; i < contact.Manifold.PointCount; i++) maxImpulse = Math.Max(maxImpulse, contact.Manifold.Points[i].NormalImpulse); // maxImpulse should contain the force of the collision } This code works great if both of these bodies are set to IgnoreCCD=true. I can calculate the force of collision between them 100% reliably. Perfect. But here's the problem: If I set the bodies to IgnoreCCD=false, that code becomes wildly unpredictable. AfterCollision is called reliably, but for some reason the NormalImpulse is 0 about 75% of the time, so only about one in four collisions is registered. Worse still, the NormalImpulse seems to be zero for completely random reasons. The dynamic body can collide with the static body 10 times in a row in virtually exactly the same way, and only 2 or 3 of the hits will register with a NormalImpulse greater than zero. Setting IgnoreCCD=true on both bodies instantly solves the problem, but then I lose continuous physics detection. Why is this happening and how can I fix it? Here's a link to a simple XNA 4 solution that demonstrates this problem in action: http://www.mediafire.com/?a1w242q9sna54j4

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• Google I/O 2010 - Exploring the Google PowerMeter API

  Google I/O 2010 - Exploring the Google PowerMeter API Google I/O 2010 - Knowledge is (less) power: Exploring the Google PowerMeter API Google APIs 101 Srikanth Rajagopalan, Rus Heywood In this session we will discuss interesting ways to make users understand and manage their home energy use through Google PowerMeter. The Google PowerMeter API currently available allows devices to integrate with Google PowerMeter. Come learn how you can build with the API and about exciting developments ahead. We will dig into the implementation details for integrations and open up the floor for other ideas that may be relevant. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 5 0 ratings Time: 58:20 More in Science & Technology

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• SQL SERVER – Storing Variable Values in Temporary Array or Temporary List

  - by pinaldave

  SQL Server does not support arrays or a dynamic length storage mechanism like list. Absolutely there are some clever workarounds and few extra-ordinary solutions but everybody can;t come up with such solution. Additionally, sometime the requirements are very simple that doing extraordinary coding is not required. Here is the simple case. Let us say here are the values: a, 10, 20, c, 30, d. Now the requirement is to store them in a array or list. It is very easy to do the same in C# or C. However, there is no quick way to do the same in SQL Server. Every single time when I get such requirement, I create a table variable and store the values in the table variables. Here is the example: For SQL Server 2012: DECLARE @ListofIDs TABLE(IDs VARCHAR(100)); INSERT INTO @ListofIDs VALUES('a'),('10'),('20'),('c'),('30'),('d'); SELECT IDs FROM @ListofIDs; GO When executed above script it will give following resultset. Above script will work in SQL Server 2012 only for SQL Server 2008 and earlier version run following code. DECLARE @ListofIDs TABLE(IDs VARCHAR(100), ID INT IDENTITY(1,1)); INSERT INTO @ListofIDs SELECT 'a' UNION ALL SELECT '10' UNION ALL SELECT '20' UNION ALL SELECT 'c' UNION ALL SELECT '30' UNION ALL SELECT 'd'; SELECT IDs FROM @ListofIDs; GO Now in this case, I have to convert numbers to varchars because I have to store mix datatypes in a single column. Additionally, this quick solution does not give any features of arrays (like inserting values in between as well accessing values using array index). Well, do you ever have to store temporary multiple values in SQL Server – if the count of values are dynamic and datatype is not specified early how will you about storing values which can be used later in the programming. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• Bullet Physic: Transform body after adding

  - by Mathias Hölzl

  I would like to transform a rigidbody after adding it to the btDiscreteDynamicsWorld. When I use the CF_KINEMATIC_OBJECT flag I am able to transform it but it's static (no collision response/gravity). When I don't use the CF_KINEMATIC_OBJECT flag the transform doesn't gets applied. So how to I transform non-static objects in bullet? DemoCode: btBoxShape* colShape = new btBoxShape(btVector3(SCALING*1,SCALING*1,SCALING*1)); /// Create Dynamic Objects btTransform startTransform; startTransform.setIdentity(); btScalar mass(1.f); //rigidbody is dynamic if and only if mass is non zero, otherwise static bool isDynamic = (mass != 0.f); btVector3 localInertia(0,0,0); if (isDynamic) colShape->calculateLocalInertia(mass,localInertia); btDefaultMotionState* myMotionState = new btDefaultMotionState(); btRigidBody::btRigidBodyConstructionInfo rbInfo(mass,myMotionState,colShape,localInertia); btRigidBody* body = new btRigidBody(rbInfo); body->setCollisionFlags(body->getCollisionFlags()|btCollisionObject::CF_KINEMATIC_OBJECT); body->setActivationState(DISABLE_DEACTIVATION); m_dynamicsWorld->addRigidBody(body); startTransform.setOrigin(SCALING*btVector3( btScalar(0), btScalar(20), btScalar(0) )); body->getMotionState()->setWorldTransform(startTransform);

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• Google I/O 2010 - Porting v2 JavaScript Maps API apps to v3

  Google I/O 2010 - Porting v2 JavaScript Maps API apps to v3 Google I/O 2010 - Stepping up: Porting v2 JavaScript Maps API applications to v3 Geo 201 Daniels Lee The JavaScript Maps API v3 is the future of the Google Maps API. To take advantage of the many great features coming to the API you will need to migrate existing v2 applications to v3. This session will guide you through the process, illustrating how easy it is to start reaping the benefits in features and performance. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 10 0 ratings Time: 01:04:07 More in Science & Technology

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• Google I/O 2010 - BigQuery and Prediction APIs

  Google I/O 2010 - BigQuery and Prediction APIs Google I/O 2010 - BigQuery and Prediction APIs App Engine 101 Amit Agarwal, Max Lin, Gideon Mann, Siddartha Naidu Google relies heavily on data analysis and has developed many tools to understand large datasets. Two of these tools are now available on a limited sign-up basis to developers: (1) BigQuery: interactive analysis of very large data sets and (2) Prediction API: make informed predictions from your data. We will demonstrate their use and give instructions on how to get access. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 57:48 More in Science & Technology

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• Google I/O 2010 - Optimizing apps with the GWT Compiler

  Google I/O 2010 - Optimizing apps with the GWT Compiler Google I/O 2010 - Faster apps faster - Optimizing apps with the GWT Compiler GWT 201 Ray Cromwell The GWT compiler isn't just a Java to JavaScript transliterator. It performs many optimizations along the way. In this session, we'll show you not only the optimizations performed, but how you can get more out of the compiler itself. Learn how to speed up compiles, use -draftCompile, compile for only one locale/browser permutation, and more. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 7 0 ratings Time: 56:17 More in Science & Technology

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• Google I/O 2010 - GWT's UI overhaul

  Google I/O 2010 - GWT's UI overhaul Google I/O 2010 - GWT's UI overhaul: UiBinder, ClientBundle, and Layout Panels GWT 201 Joel Webber, Ray Ryan There have been some really huge improvements in GWT's UI fundamentals over the past year. We've introduced features such as UiBinder, ClientBundle, CssResource, and über layout panels that allow you to build fast UIs in a sane manner. Come see how fun/easy/fast it can be to use these technologies in harmony to overhaul your UI. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 9 1 ratings Time: 01:00:11 More in Science & Technology

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• Why is a small fixed vocabulary seen as an advantage to RESTful services?

  - by Matt Esch

  So, a RESTful service has a fixed set of verbs in its vocabulary. A RESTful web service takes these from the HTTP methods. There are some supposed advantages to defining a fixed vocabulary, but I don't really grasp the point. Maybe someone can explain it. Why is a fixed vocabulary as outlined by REST better than dynamically defining a vocabulary for each state? For example, object oriented programming is a popular paradigm. RPC is described to define fixed interfaces, but I don't know why people assume that RPC is limited by these contraints. We could dynamically specify the interface just as a RESTful service dynamically describes its content structure. REST is supposed to be advantageous in that it can grow without extending the vocabulary. RESTful services grow dynamically by adding more resources. What's so wrong about extending a service by dynamically specifying a per-object vocabulary? Why don't we just use the methods that are defined on our objects as the vocabulary and have our services describe to the client what these methods are and whether or not they have side effects? Essentially I get the feeling that the description of a server side resource structure is equivalent to the definition of a vocabulary, but we are then forced to use the limited vocabulary in which to interact with these resources. Does a fixed vocabulary really decouple the concerns of the client from the concerns of the server? I surely have to be concerned with some configuration of the server, this is normally resource location in RESTful services. To complain at the use of a dynamic vocabulary seems unfair because we have to dynamically reason how to understand this configuration in some way anyway. A RESTful service describes the transitions you are able to make by identifying object structure through hypermedia. I just don't understand what makes a fixed vocabulary any better than any self-describing dynamic vocabulary, which could easily work very well in an RPC-like service. Is this just a poor reasoning for the limiting vocabulary of the HTTP protocol?

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• Google I/O 2010 - Testing techniques for Google App Engine

  Google I/O 2010 - Testing techniques for Google App Engine Google I/O 2010 - Testing techniques for Google App Engine App Engine 201 Max Ross We typically write tests assuming that our development stack closely resembles our production stack. What if our target environment only lives in the cloud? We will highlight the key differences between typical testing techniques and Google App Engine testing techniques. We will also present concrete strategies for testing against local and cloud-based implementations of App Engine services. Finally, we will explain how to use App Engine as a highly parallel test harness that runs existing test suites without modification. For all I/O 2010 sessions, please go to code.google.com/events/io/2010/sessions.html From: GoogleDevelopers Views: 6 1 ratings Time: 54:29 More in Science & Technology

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• /etc/resolv.conf nameserver fd00::1

  - by user88631

  My /etc/resolv.conf constantly get a mysterious entry, i run a home network with ipv6 provided by ravd, the interface is auto-configured by Network manager (all name server lookups are lost when this line is first in my /etc/resolv.conf) . Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) **# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN** nameserver fd00::1 nameserver 192.168.1.1 search home.int When ping is working cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 192.168.1.1 search home.int So something is putting fd00::1 at start of file, not if I ping6 fd00::1 I get Destination unreachable: Administratively prohibited To diagnose this I ran the router with single cable to connected to ubuntu machine. Ran tcpdump + restarted network on ubuntu. "tcpdump ip6 -e -i eth0 | grep fd00" finds nothing, it's not being advertised via the network.. The only hit I got was when an upstream router refused a connection attempt from the ubuntu machine to fd00::1. I have also switched on debug for network manager & it appears to set the mystery line.. 15:22:14 storage-pc NetworkManager[349]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete. 15:22:14 storage-pc NetworkManager[349]: <warn> dnsmasq exited with error: Other problem (5) 15:22:14 storage-pc NetworkManager[349]: <debug> [1346822534.281528] [nm-dns-manager.c:598] update_dns(): updating resolv.conf 15:22:14 storage-pc NetworkManager[349]: <debug> [1346822534.281875] [nm-dns-manager.c:719] update_dns(): DNS: plugin dnsmasq ignored (caching disabled) 15:22:14 storage-pc NetworkManager[349]: <info> ((null)): writing resolv.conf to /sbin/resolvconf 15:22:14 storage-pc dbus[2184]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher' 15:22:14 storage-pc dnsmasq[2875]: reading /etc/resolv.conf 15:22:14 storage-pc dnsmasq[2875]: using nameserver 192.168.1.1#53 15:22:14 storage-pc dnsmasq[2875]: using nameserver fd00::1#53 Any suggestions on how to find out where this comes from?

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• Google I/O 2010 - Scripting Google Apps for business

  Google I/O 2010 - Scripting Google Apps for business Google I/O 2010 - Scripting Google Apps for business process automation Enterprise 201 Evin Levey Learn how to use Google Apps for business process automation, and custom work-flow. We'll introduce the powerful scripting service along with several easy-to-use interfaces including Spreadsheets, Calendar, Sites and the Document List. We'll also demonstrate interoperability with third party web services and showcase exciting new developments in Google Apps Script. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 8 0 ratings Time: 53:16 More in Science & Technology

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• Google I/O 2010 - Connecting users w/ places

  Google I/O 2010 - Connecting users w/ places Google I/O 2010 - Where you at? Connecting your users with the places around them Geo 201 Marcelo Camelo, Chris Lambert, Dave Wang (Booyah) With the proliferation of GPS-enabled mobile devices, the locations of your users are now readily accessible to applications. This session will illustrate how to manage this location data and exploit the rich local information that Google offers to place your users in the context of their surroundings. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 65 0 ratings Time: 01:01:55 More in Science & Technology

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• Google I/O 2010 - Appstats - instrumentation for App Engine

  Google I/O 2010 - Appstats - instrumentation for App Engine Google I/O 2010 - Appstats - RPC instrumentation and optimizations for App Engine App Engine 201 Guido van Rossum Appstats is a pure userland library (for Python and Java) that inserts instrumentation hooks into the App Engine runtime at the interface between the runtime and services like the datastore. The collected statistics can be browsed in a rich UI which allows drilling down to various levels of detail. The talk will also discuss common optimizations to address typical findings. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 19 0 ratings Time: 59:31 More in Science & Technology

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• Google I/O 2010 - Bringing Google to your site

  Google I/O 2010 - Bringing Google to your site Google I/O 2010 - Bringing Google to your site Google APIs 101 DeWitt Clinton, Jeff Scudder This is an overview session about some of the many ways that a developer can enrich their site and more fully engage their visitors using Google products. We will cover a variety of products and APIs designed to quickly and easily improve and monetize your site, from AdSense and Custom Search to Feeds and Web Elements. We'll include announcements for several eye-popping new features. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 8 0 ratings Time: 57:26 More in Science & Technology

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• Google I/O 2010 - Customizing Google Apps

  Google I/O 2010 - Customizing Google Apps Google I/O 2010 - Customizing Google Apps & integrating with customer environments Enterprise 201 Mike O'Brien, Matt Pruden (Appirio), Adam Graff (Genentech), Don Dodge (moderator) Learn from real life examples of customizing Google Apps to meet customer requirements. Hear from the customer (Genentech) and the System Integrator (Appirio). Explore integration issues and deployment best practices with people who have done it. Get your questions answered in this session. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 52:00 More in Science & Technology

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• Google I/O 2010 - Launch your app in Google Apps w/ gadgets

  Google I/O 2010 - Launch your app in Google Apps w/ gadgets Google I/O 2010 - Launch your app inside of Google Apps with gadgets Enterprise 201 Dan Holevoet Gadgets represent a valuable opportunity to get in front of the many Google Apps users who use Gmail, Google Calendar, and Google Sites throughout the day. This session will talk about how you can write gadgets as natural extensions of your existing products and take advantage of the unique opportunities available to gadgets in Google Apps. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 14 0 ratings Time: 41:55 More in Science & Technology

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• Google I/O 2010 - Deep dive on Gmail contextual gadgets

  Google I/O 2010 - Deep dive on Gmail contextual gadgets Google I/O 2010 - Building context-aware extensions for Gmail - Deep dive on Gmail contextual gadgets Enterprise 201 Dan Holevoet How much time do your users spend in email everyday? Wouldn't it be nice if you could seamlessly integrate your apps into the rich context offered by their email and allow them to avoid shifting to new applications for various tasks? Gmail contextual gadgets allow you to register regular expressions and insert gadgets into e-mail messages based on their content. In this session, you'll learn how to create and distribute these powerful gadgets. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 7 0 ratings Time: 52:39 More in Science & Technology

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• Google I/O 2010 - Data migration in App Engine

  Google I/O 2010 - Data migration in App Engine Google I/O 2010 - Data migration in App Engine App Engine 201 Matthew Blain Learn about the App Engine bulk loader and see an example of migrating data from an external data source into the app engine datastore--and back out. Do you have data stored in a traditional, relational DB which you'd like to upload to App Engine? This session will teach you how. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 44:26 More in Science & Technology

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• Google I/O 2010 - Fluid social experiences across sites

  Google I/O 2010 - Fluid social experiences across sites Google I/O 2010 - Bridging the islands: Building fluid social experiences across websites Social Web 201 John Panzer, Joseph Smarr As more sites add social functionality, profiles, friends, and conversations are becoming increasingly fragmented. But an emerging collection of open technologies aim to help bridge these social islands, allowing users to seamlessly move between sites and have unified conversations that span multiple web sites. Learn how OpenID, OAuth, Portable Contacts, ActivityStrea.ms, and Salmon can help you connect to the rest of the Social Web. For all I/O 2010 sessions, please go to code.google.com/events/io/2010/sessions.html From: GoogleDevelopers Views: 2 0 ratings Time: 01:01:42 More in Science & Technology

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• Google I/O 2010 - Making smart & scalable Wave robots

  Google I/O 2010 - Making smart & scalable Wave robots Google I/O 2010 - Making smart & scalable Wave robots Wave 201 David Byttow, Marcel Prasetya A smart robot must be able to store persistent data. Wave robots can store data in wave structures, like wavelets, datadocs, and annotations, instead of traditional datastores. A scalable robot must perform operations with minimal bandwidth. Wave robots can optimize by selecting the appropriate amount of context, the optimal events, and narrow filters for events. In this talk, we'll share best practices on data storage and scaling. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 9 0 ratings Time: 58:25 More in Science & Technology

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• Google I/O 2010 - Cloud computing for geospatial apps

  Google I/O 2010 - Cloud computing for geospatial apps Google I/O 2010 - Unleash your map data: Cloud computing for geospatial applications Geo 101 Tom Manshreck The Google Maps API made geospatial development accessible to all but hosting your data remains complex and time consuming. This session will detail the services Google offers for storing your geospatial data in the cloud, illustrate the ways in which that data can be accessed and visualized, and walk through development of a retail store finder using these technologies. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 322 0 ratings Time: 40:22 More in Science & Technology

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• Physics not synchronizing correctly over the network when using Bullet

  - by Lucas

  I'm trying to implement a client/server physics system using Bullet however I'm having problems getting things to sync up. I've implemented a custom motion state which reads and write the transform from my game objects and it works locally but I've tried two different approaches for networked games: Dynamic objects on the client that are also on the server (eg not random debris and other unimportant stuff) are made kinematic. This works correctly but the objects don't move very smoothly Objects are dynamic on both but after each message from the server that the object has moved I set the linear and angular velocity to the values from the server and call btRigidBody::proceedToTransform with the transform on the server. I also call btCollisionObject::activate(true); to force the object to update. My intent with method 2 was to basically do method 1 but hijacking Bullet to do a poor-man's prediction instead of doing my own to smooth out method 1, but this doesn't seem to work (for reasons that are not 100% clear to me even stepping through Bullet) and the objects sometimes end up in different places. Am I heading in the right direction? Bullet seems to have it's own interpolation code built-in. Can that help me make method 1 work better? Or is my method 2 code not working because I am accidentally stomping that?

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