NAME¶
Gyotoy - visualize one geodesic in Kerr metric
SYNOPSIS¶
gyotoy [
input.xml]
DESCRIPTION¶
Gyoto is a framework for computing geodesics in curved space-times. The
gyotoy utility program uses this framework to compute and display a
single geodesic (the trajectory of a massive or mass-less particle) in Kerr
metric.
gyotoy takes as optional argument a scenery description in XML format (
input.xml). This scenery must contain a Astrobj section of kind Star.
Alternatively, a default scenery is loaded.
The user can then interactively select initial parameters and redraw the
geodesic as many time as needed. the Projection parameters allow rotating the
view and various menu entries are rather self-explanatory. Entries in the File
menu allow saving the display as an image file, saving the parameters as an
XML description, or saving the geodesic's coordinates in an ASCII file.
gyotoy is only a small utility to visualise a single geodesic. It can
also be invoked from the
yorick(1) prompt for building more complex
graphics and for scripting. Have a look at the gyoto.i and gyotoy.i files in
yorick's Y_SITE directory.
A companion program,
gyoto(1), can be used to compute an entire Gyoto
scenery using relativistic ray-tracing.
ENVIRONMENT¶
- GYOTO_PLUGINS
- The "Star" object in Gyoto is part of the standard plug-in. If
the GYOTO_PLUGINS environment variable is set, it must contain at least
"stdplug" for gyotoy to run properly.
AUTHOR¶
Thibaut Paumard <thibaut.paumard@obspm.fr> wrote this manual.
SEE ALSO¶
gyoto(1),
yorick(1)