#####Key function description (Keyboard and mouse)
-keypress 'a' - animate
-keypress 'f' - fullscreen/window toggle
-keypress 'p' - pause
-keypress 'i/I' - move camera in 1/0.1 units
-keypress 'P' - show parentage toggle
-keypress 'l' - light proxy toggle
-keypress 'o/O' - move camera out 1/0.1 units
-keypress 't' - text display toggle
-keypress 'X/x' - turn on the global/local axis markers
-keypress 'v' - draw vertices toggle
-keypress 'g' - turn on the XZ plane grid
-keypress 'n' - turn on the display of normals
-keypress 'q', 'ESC' - quot