GYOTOY(1)

💫 GYOTOY(1) — the manual, but make it cute 💫

okay bestie, welcome to the User Manuals section, this one's filed under Science, and it's all about a lil utility called Gyotoy 🎀

✨ NAME ✨

Gyotoy — visualize one geodesic in Kerr metric 🌀✨

🌸 SYNOPSIS 🌸

gyotoy [input.xml]

💖 DESCRIPTION 💖

okay so first things first: Gyoto is a framework for computing geodesics in curved space-times. and the gyotoy utility program uses this framework to compute and display a single geodesic — that's the trajectory of a massive or mass-less particle — in Kerr metric. just one. one singular lil guy. main character geodesic energy fr 💅

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. no biggie, it's got you 🫶

then the user can interactively select initial parameters and redraw the geodesic as many times as needed. the Projection parameters let you rotate the view, and various menu entries are rather self-explanatory (they really are, iykyk). entries in the File menu let you:

• save the display as an image file 📸
• save the parameters as an XML description
• save the geodesic's coordinates in an ASCII file

ngl gyotoy is only a small utility to visualise a single geodesic. but plot twist — 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.

and a companion program, gyoto(1), can be used to compute an entire Gyoto scenery using relativistic ray-tracing. iconic behavior, different job though 🌈

🌿 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.

⚠️ bestie listen: if GYOTO_PLUGINS is set and "stdplug" isn't in there, gyotoy is not gonna run properly. it's giving "no notes, just vibes" except the vibes are broken. set it right 💀

🦋 AUTHOR 🦋

Thibaut Paumard <thibaut.paumard@obspm.fr> wrote this manual. king behavior 👑

⭐ SEE ALSO ⭐

• gyoto(1)
• yorick(1)

and that's the whole vibe check 🎀 this was the Science manual page for GYOTOY(1), dated AUGUST 2011, and honestly? it ate. periodt 💅✨🦋🌸💜