keyboard operations:
	press    'n'      move blue dot to next corner
	press    'p'      move blue dot to previous corner
	press    'o'      move blue dot to opposite corner, if it exist
	press    'r'      move blue dot to right corner, if it exist
	press    'l'      move blue dot to left corner, if it exist
	press  '>' & '<'  move blue dot along the border
	
	press    'c'      toggle circle/select mode
	press  '+' & '-'  adjust the circle size
	
	press    's'      show/hide Smoothing prediction
	press    'S'      perfotm Smoothing
	press  '[' & ']'  adjust smoothing ratio
	
	press    'd'      show/hide displacement vectors
	press    'D'      perfotm interior vertices displacement
	
	press    'v'      toggle 2D/3D mode
	press   ARROWS    rotate mesh in 3D mode
	
	press    'L'      perform 3D Laplace Smoothing
	press    'B'      perform 3D Bi-Laplace Smoothing
	press    'A'      perform volume preserve Smoothing
	press    'E'      perform edge relaxtion volume preserve Smoothing with (see support paper or write up)

	
	press    'w'      save mesh (O-Table and V-Table) to file
	press    '0'      load last saved mesh
	
	press BACKSPACE   To reset, return to one triangle
	press   'ESC'     To exit
	press    'h'      To show this help
	

mouse operations:
	right click to have the state selection menu poped out
	middle click on an interior vertex to displace it and diffuse the volume change to its neighbors