Text this: Quantitative analysis of visibility determinations for networked virtual environments

 __   __     ___     _    _      ___     _    _   
 \ \\/ //   / _ \\  | |  | ||   / _ \\  | \  / || 
  \   //   / //\ \\ | |/\| ||  | / \ || |  \/  || 
  / . \\  |  ___  |||  /\  ||  | \_/ || | .  . || 
 /_//\_\\ |_||  |_|||_// \_||   \___//  |_|\/|_|| 
 `-`  --` `-`   `-` `-`   `-`   `---`   `-`  `-`