Name: Lloyd Wood
Member since: 2005-04-04 14:17:52
Last Login: 2016-02-07 07:59:07



You'd rather read
everyone else's diary entries.


Articles Posted by lloydwood

Recent blog entries by lloydwood

SaVi seasonal software development.

It's become my habit to use some of the downtime over the year-end break to... oh, said that about a year ago.

Once again, I did some software work over Christmas and released SaVi 1.4.9, for simulating satellite constellations.

This is mostly a maintenance release, which was needed to remove some old code that used tmpnam(), which modern linkers dislike. But it also adds some approximate simulations of LeoSat and OneWeb, which are "megaconstellations" currently competing to get constructed. (Mega? They're not even kilo...)

I'm having flashbacks to the 1990s, when I first started on SaVi, and big constellations like Teledesic and Skybridge were all the rage.
26 Dec 2014 (updated 4 Jan 2015 at 22:39 UTC) »
SaVi seasonal software development.

It's become my habit to use some of the downtime over the year-end break to work on development of the SaVi satellite software that I maintain.

This Christmas, I added a new multi-colour map projection, which is quite pretty to look at in 3D in Geomview, if not as clear or as informative as other renderings.

It's in development code, and snapshots featuring that and a simulation of the equatorial exclusion zone for geostationary satellites are available. I should do a 1.4.7 release early in the new year.

Update: SaVi 1.4.7 was released on 5 January 2015, and available for download.

SaVi on Raspberry Pi.

Discovered that my SaVi satellite constellation visualization software could be installed easily on a Raspberry Pi, which is far more powerful than what I began working on SaVi on, so many years ago.

And that SaVi is now available for a very wide range of architectures.

My PhD work is running on the big screen in the living room. Looks like I've finally gotten satellite TV.

Learned that there's now a 64-bit Cygwin. And that SaVi and Geomview don't work well under it - OpenGL is disabled to prevent a crash, limiting Geomview to software rendering, and there's something odd in Cygwin's piping support that prevents the two applications communicating, unlike 32-bit Cygwin and 32- and 64-bit everything else.

I discovered this while helping out a Geomview user who had naively installed 64-bit using the installer from Cygwin's site, as there was no warning that it was very new and unproven. Still, the instructions for building Geomview under Cygwin have been updated.

Cygwin's an ever-moving target, without stable fixed-point releases that are a known quantity. Exposing users to development may help development, but it doesn't do much for users.

SaVi 1.4.6 is now released. Minor changes and bugfixes. This was necessary to support Cygwin transitioning away from Insight Tcl 8.4 to unix Tcl 8.5. Documenting how to build this on Mac OS X is a moving target, now that the Xcode app requires checking a box before command and compile tools become available. Hopefully the instructions are clear enough.

101 older entries...


lloydwood certified others as follows:

Others have certified lloydwood as follows:

  • lloydwood certified lloydwood as Journeyer
  • berend certified lloydwood as Journeyer
  • mwh certified lloydwood as Journeyer
  • mirwin certified lloydwood as Master
  • Denny certified lloydwood as Apprentice
  • negative certified lloydwood as Journeyer
  • realblades certified lloydwood as Apprentice
  • wspace certified lloydwood as Apprentice
  • fxn certified lloydwood as Journeyer
  • mpr certified lloydwood as Journeyer
  • fzort certified lloydwood as Master
  • adulau certified lloydwood as Master
  • sye certified lloydwood as Journeyer

[ Certification disabled because you're not logged in. ]

New Advogato Features

New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.

Keep up with the latest Advogato features by reading the Advogato status blog.

If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!

Share this page