Contribute correction: The Ray Tracing Demo

           _    _     _____      ___    
  ____    | || | ||  |__  //    / _ \\  
 |    \\  | || | ||    / //    / //\ \\ 
 | [] ||  | \\_/ ||   / //__  |  ___  ||
 |  __//   \____//   /_____|| |_||  |_||
 |_|`-`     `---`    `-----`  `-`   `-` 
 `-`