This is not spiral
. spiral.cc to compile ./spiral.exe to run (Windows) - works Native/in Wine ./spiral.e to run (Linux X11) - uses GLUT to simplify
rle integration needs shadow drawing because neither buffer is really accessible anyway
This is an early upload because it compiles in Windows XP using mingw32 (and also msys2) and also in Linux (Mint) Linux version spiral.e has no functional keyboard yet Windows version spiral.exe can't read key/mouse at the same time and seems to have lost CTRL/SHIFT zoom but it all needs a rework Next release will be notspiraltoo, and it will be an aggregator
Perspective drawing of lat/log sphere with rotating disc
rotating disc has linear actuators to be configured for inverse kinematics
(resolving the lengths from the angles from the target position)
remove return; in update() for broken auto-centreing
Z-X rotate, C-V actuator1, B-N actuator2