Void Compartments
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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  
 

3ex2b00

regionlayervoid

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