After looking at a flight record in GO4, I realized I could fly a pattern with letters and words. It is too inaccurate to fly manually, so I employed Litchi.
For my first test, the flight path was generated from a 122 Waypoint mission in Litchi on a slave controller, while a flight path was recorded on a master controller running GO4. I then generated a gpx file from the GO4 flight record and loaded it into Google Earth Pro so it could be isolated and recorded in a video clip. The clip was then applied to a separate video clip to simulate skywriting.
Since my first test, I have written software to transform what is essentially a two dimensional flight (with minor variations in altitude) to a three dimensional Litchi mission. So now I can take a flat, 2D Litchi mission and stand it upright, rotate it, and size it at needed. I have several flights I'm currently working on... flowers, a shooting star, a window, a globe. It keeps my 76 year old brain from dying!
Here's a very brief overview of how I did it...
