<< Click to Display Table of Contents >> Navigation:  Problem Descriptor Reference > The Sections of a Descriptor > Boundaries > Regions > Empty Layers in 3D

In three dimensional problems, it is sometimes necessary to define holes or excluded regions in the extruded domain.  This may be done using the VOID qualifier. VOID has the syntax of a parameter redefinition.

For example, the following descriptor fragment defines a 3-unit cube with a 1-unit cubical hole in the center:

EXTRUSION  Z=0,1,2,3

BOUNDARIES

REGION 1

START(0,0) LINE TO (3,0) TO (3,3) TO (3,0) TO CLOSE

REGION 2

LAYER 2 VOID

START(1,1) LINE TO (2,1) TO (2,2) TO (1,2) TO CLOSE

 

Examples:

Samples | Usage | 3D_Domains | 3D_Void.pde