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Any point in a path may be followed by one of the specifications

FILLET(radius)
BEVEL(length)  

The point will be replaced by a circular arc of the specified radius, or by a bevel of the specified length. FILLETS and BEVELS should not be applied to points which are the intersection of several segments, or confusion may ensue.

Example:

LINE TO (1,1) FILLET(0.01)

 

Example problem:

Samples | Usage | Misc | Fillet.pde

Samples | Usage | 3D_Domains | 3D_Fillet.pde