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 __   _      ___     _    _      ___              
| || | ||   / _ \\  | |  | ||   / _ \\    ____    
| '--' ||  | / \ || | |/\| ||  | / \ ||  |    \\  
| .--. ||  | \_/ || |  /\  ||  | \_/ ||  | [] ||  
|_|| |_||   \___//  |_// \_||   \___//   |  __//  
`-`  `-`    `---`   `-`   `-`   `---`    |_|`-`   
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Text this: Geometric model for computer graphics : Disk and Ball B-Spline