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

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Text this: Shading-based surface detail recovery under general unknown illumination