F = T ∇ Sτ

During my research for 3D graphics application development I've noticed that a lot of tutorials and advices on the Internet are obsolete, imcomplete or even incorrect. That's why I've decided to create an open source technological demo of OpenGL for Android platform. That's just a demo, so it doesn't have any particular useful purpose, but shows the methods and algorithms to accomplish certain tasks. For now the application reads public NORAD satellite database and shows the satellite positions and altitude related to Earth in the form of beams (the height of the beam represents the relative altitude). The 3D features present:  - OpenGL ES 2;  - rotating, multi-touch zooming and moving the globe;  - stars on a fixed background;  - each satellite is represented by a beam with a unique color;  - identifying the corresponding satellite if a beam has been tapped (based on color picking method). Additionally to 3D features presented the application is:  -