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

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