Mass-Spring-Damper simulation using a model based on Python, Boost or Cython. Coefficient estimation is performed using a number of techniques including linear regression, gradient-based optimisation and sampling.

Second post for 2015! Lmstat Usage Profile.

It's been a long time since the last post! Lately I've been playing around with mapping frameworks and services. Click through for a brief introduction on using Mapbox to create beatutiful layered maps.

Time for another post. This one shows the Selective Bathymetric SLAM approach, detailed in this recent paper, Navigational Error Reduction of Autonomous Underwater Vehicles with Selective Bathymetric SLAM.

I thought I should post something on an area I've been working in more recently, so here is my simulation of the Simultaneous Localisation and Mapping (SLAM) technique, as applied to an autonomous vehicle navigating through waypoints across a feature-rich terrain.

Managed to export my VRML simulation to X3D, and embed it here with the HTML5 X3DOM Framework. Note that you will need to use a supported browser in order to view the model.

I dug up some more old VRML simulation replays created some time ago. These ones demonstrate the dynamic response of CH-47B Chinook and UH-1H helicopters with externally slung loads undergoing a either simple disturbance or manoeuvre. The coupled-body dynamic simulation was performed in Matlab and then exported to VRML for visualisation.

Building on my simple wxPython multiprocessing example, I've extended the design to implement a distributed computing architecture, using Pyro.

Now that the multiprocessing library comes standard in Python 2.6, I thought I'd migrate some of my apps to take full advantage. However, there aren't many examples out there showing how to write a basic multiprocessing program with a graphical front-end. In order to prototype the program design, I wrote a simple wxPython script.

Just tidied up my VRMLtrace python program. This script converts any simulation/pose data (position+orientation) into a VRML model for visualisation. It uses a template file, a VRML model of the vehicle and a data file to generate the VRML.