Ruby 1.8.5 is installed by default in Ubuntu Feisty, this version presents some problems when you try to program with Rails. If you want to debug your application using breakpointers, Webrick will abort showing the following message:

Breakpoints are not currently working with Ruby 1.8.5

RAILS_ROOT: script/../config/..
Application Trace | Framework Trace | Full Trace

vendor/rails/railties/lib/breakpoint.rb:21:in `of_caller'
vendor/rails/railties/lib/breakpoint.rb:543:in `breakpoint'
app/controllers/books_controller.rb:19:in `show'

In order to avoid this problem, I’ve downgraded my ruby version to the one used in Edgy (the previous version of Ubuntu). Concretely, it is necessary to downgrade this packages:
Continue reading Rails’ Breakpoint does not work in Ubuntu Feisty (ruby version problem) →

As you probably know, I am working in a small Czech company doing a demo of a Massively Multiplayer Online Game (MMOG). I am working very hard these days because I want to get some good advances. I am using

OpenTNL: Fantastic library for MMOG, it implements a protocol using UDP that guarantees packet order without lost ones.

OGRE: 3D engine, really nice. Now that I know a little bit about it I am wondering why I did not use it in the past?? I know some University practices where I could use this engine to make it more easy and beautiful.

I have usefull code working with OpenTNL, although I want to improve it. Now I understand how OGRE works, so I need to think about how I can use it in combination with OpenTNL. Tonight I have been thinking in the design and it is not easy work, but I hope I can manage.

It is a pitty that I do not have enough talent to create good 3D models and sounds, but well, for these kind of things we will have another person in the company.

The best part is that I am really enjoying it 🙂

I have just fixed a date for doing a conference in Prague…

Date: 26th May 2005
Time: 16:00
Place: Strahov koleje (Block 7), Prague (Czech Republic)
Language: English
Topic: Free Software
Content:

– History
– Defintion
– Myths
– Free Software in Spain
– Ubuntu

After my presentation, Petr (Czech linux user) will talk about his experiences and how can we develop applications for GNU/Linux. And I do not know if Michal (another Czech linux user) will be able to talk about GNU/Linux games and how can we develop games for that platform.

I do not feel that my English skills have been improved during this period, but I want to try to do it. I think it can be interesting, although I am sure I will be a little bit nervous because it is the first time I do a conference in English 😀

The conference room is very small, capacity is limited to 30 people… and I am not sure if it is going to come too many, so I hope that a relaxed environment will help me 😉

I have been playing with my webcam in GNU/Linux, I have found this web where you can find a list of interesting applications you can use with a TV or webcam (everything is Video4Linux). I have tested several of them, the most insteresting for me:

• webcamserver You can make your camera’s stream available through a Java Applet.
• lives You can insert effects in your videos, I have not tested it too much.
• EffecTV Absolutely fantastic, you can add real time effect to your camera image… as I have see you can play with “video loopback” to try to record the result. I have to search more info about vloopback.
• Camorama GNOME app

The only thing I have not been able to do is recording video with a decent program 🙁 Xawtv does not permit me to use a lower resolution, it takes 640×480 and the frame rate is too low for a good video.

I have started playing around with Beatrix LiveCD, it is based in Ubuntu with Knoppix boot loader and Kanotix installer. It seems that they have integrated part of the desktop into the kernel so it get loaded very very fast. It is oriented to old computers so it comes with little software, but as it is like an Ubuntu… you can install anything you want later. I am now downloading others liveCDs in order to compare them 🙂