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I'm David Llewellyn-Jones and this is my homepage. I'm a researcher in network security who's also interested in programming and graphics. You might be interested in my research, my software or my random musings.

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17 Dec 2014 : Makeover # has had a style makeover to make it a bit cleaner. It's just a fresh layer of CSS so it's easy to switch back if the change is too painful. There are also some swively social icons on the homepage now too. If you notice any problems with the redesign (I wasn't able to check it on iOS or Android) please let me know.
15 Dec 2014 : Constantia certified as being Constantia #
Time to renew Constantia's SSL certificate! I've used StartSSL's free service again, which is always a bit tense as you only get once chance, but after a bit of wrangling everything's now back in place for another year.
2 Nov 2014 : Functy 0.33 released #
This version allows you to export function animations as a series of PNG frames. It also allows models to be exported in Simple Voxel SVX format which is unusual since it outputs as a volume rather than a surface and can be used to upload models to Shapeways for 3D printing, like this. There are also some UI improvements, like a progress bar for long exports, and some info/documentation options. Installers and source are available from the Functy site or Sourceforge.
4 Oct 2014 : Functy 0.32 released #
A rapid release with a few new changes, the latest version of Functy is now up to version 0.32. It now supports STL export of models and animations. There have also been some important bugfixes, especially to fix PLY export that sometimes resulted in corrupted output under Windows. The new installers and source are available from the Functy site or Sourceforge.
28 Sep 2014 : Functy 0.31 released #
Functy version 0.31 is now available from the Functy site and Sourceforge. It has a couple of UI improvements, allowing the left and lower panel to be toggled on and off. Shadows can also be turned on and off, and the focus blur depth of field can be controlled.