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The reserved word VOID is treated syntactically the same as a parameter redefinition.  If this word appears in any of the LAYER-qualified positions above, then that (region,layer) compartment will be excluded from the domain.

REGION 2        'blob'        { the embedded blob }

LAYER 'Can' VOID

START 'ring' (R,0)

ARC(CENTER=0,0) ANGLE=360

 

 

 

 

The example problem "Samples | Usage | 3D_Domains | 3D_Void.pde" demonstrates this usage.