About teusje

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Le Petit Chef

In our newest mapping project, a miniature chef turns your plate into a projected grill. Bon appétit!
By Antoon Verbeeck and Filip Sterckx. Contact us if you would like to have this projection or a customized version of this project at your event: skullmapping@gmail.com.
Thanks to Stake5 for the projectors (www.stake5.be)
http://www.skullmapping.com

Computational Hydrographic Printing

by Yizhong Zhang, Chunji Yin, Changxi Zheng and Kun Zhou
Technical Paper at ACM SIGGRAPH 2015
http://www.cs.columbia.edu/~cxz/publi…

Abstract:
Hydrographic printing is a well-known technique in industry for transferring color inks on a thin film to the surface of a manufactured 3D object. It enables high-quality coloring of object surfaces and works with a wide range of materials, but suffers from the inability to accurately register color texture to complex surface geometries. Thus, it is hardly usable by ordinary users with customized shapes and textures.

We present computational hydrographic printing, a new method that inherits the versatility of traditional hydrographic printing, while also enabling precise alignment of surface textures to possibly complex 3D surfaces. In particular, we propose the first computational model for simulating hydrographic printing pro- cess. This simulation enables us to compute a color image to feed into our hydrographic system for precise texture registration. We then build a physical hydrographic system upon off-the-shelf hardware, integrating virtual simulation, object calibration and controlled immersion. To overcome the difficulty of handling complex surfaces, we further extend our method to enable multiple immersions, each with a different object orientation, so the combined colors of individual immersions form a desired texture on the object surface. We validate the accuracy of our computational model through physical experiments, and demonstrate the efficacy and robustness of our system using a variety of objects with complex surface textures.

see also “Water Transfer Printing”

Meet Microsoft Hyperlapse

Introducing Microsoft Hyperlapse, available for download at http://aka.ms/hyperlapse. Microsoft Hyperlapse lets you creates smooth and stabilized time lapses, distilling your experiences into beautiful, shareable videos. Show off footage from your hike, or let your friends experience how it felt to fly down the mountain on skis. Hyperlapse is available as an app for Android or Windows Phone, as well as a pro version in preview for enthusiasts or professionals who want to hyperlapse video from a GoPro or other camera.

Slow performance on ASP.NET MVC application using EntityFramework + SQL Server

Used technologies and software:

  •  ASP.NET MVC 5
  • Entity Framework Code First 6.x
  • SQL Server 2014 Express
  • Windows Server 2012
  • IIS 8.0
  • Hyper-V Virtual Machine (SSD and 8GB RAM set dynamic with 4GB as start up value).
  • Visual Studio 2013

Problem:

Website in production is slow, takes several seconds (+30s) or even minutes to load a page. But this does not always happen.
In development everything works always fast.

Steps taken to figure out the problem:

  • Netword config, NIC, IP, DNS, … –> ok
  • Checking if connection string is set correctly. –> ok
    (tip: see https://teusje.wordpress.com/2012/02/21/how-to-test-an-sql-server-connection/ )
  • Adding caching to the ASP.NET MVC application. –> ok, but still too slow
  • SQL Server 2014 Profiler:
    Trying to figure out if it is the application or the SQL Server, so we ran the Profiler and copy several queries and executed them directly on the SQL Server without any problem.
  • Log files:
    Custom log file in the ASP.NET MVC application gave us a good hint:

    Exceptions:

     sqlexception: Timeout expired EntityCommandExecutionException
    
     SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.
     Stack:    at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
        at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
        at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
        at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
        at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
        at System.Data.SqlClient.SqlDataReader.get_MetaData()
        at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
        at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)
        at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)
        at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
        at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
        at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
        at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
        at Glimpse.Ado.AlternateType.GlimpseDbCommand.ExecuteDbDataReader(CommandBehavior behavior)
        at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
        at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.b__c(DbCommand t, DbCommandInterceptionContext`1 c)<
        at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
        at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext)
        at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior)
        at System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior)
        at System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior)

Start Microsoft SQL Server Management Studio and navigate to:
[Server Instance] –> [Management] –> [SQL Server Logs] –> double click [Current – …] there you select [Windows NT]

There we’ve seen the real problem several times in the logs:

"AppDomain 50 (master.sys[runtime].48) is marked for unload due to memory pressure."

sql server problem

Now we simply started Task Manager on the server and watched the ‘Memory’ in the ‘Performance’ tab.
The memory was constantly at 3.7GB or 3.8GB when we visited the website.

vm memory
Hooray! We found the problem. :-) Now we need to find a solution.

As you might remember from the beginning of this post, we’ve configured our Hyper-V Virtual Machine with the Dynamic Memory option.
This had a start up value of 4GB… and our server was constantly at 3.7GB or 3.8GB…

So why does our server not dynamically increase the RAM of the virtual machine?

It turns out that Hyper-V Dynamic Memory, introduced in Windows Server 2008 R2 SP1, is only supported in SQL Server Enterprise and Datacenter Editions!

Solution:

Don’t enable Hyper-V Dynamic Memory for your virtual machine but set it static with a value of e.g. 8GB RAM.

Voila:

vm memory fixed

:-)

Your Host Operating System needs to be at least Windows Server 2008 R2 SP1 or Microsoft Hyper-V Server 2008 R2 SP1 as your Hyper-V host.
The Guest Operating System edition (= your virtual machine) needs to be Web, Standard, Enterprise or Datacenter.
You need SQL Server Enterprise or Datacenter edition if you want that SQL Server automatically uses more RAM when needed using the Hyper-V Dynamic Memory feature.
In case you just have a Windows Server Standard and SQL Server Express and you have the same symptoms as described above just set your virtual machine RAM to a static value instead of using Hyper-V Dynamic Memory.

Extra information:

Freightliner Inspiration Truck

Platooning technology:

see also:

See also:

Autonomous driving: Mercedes-Benz Future Truck 2025:
https://teusje.wordpress.com/2014/07/05/autonomous-driving-mercedes-benz-future-truck-2025/