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### **NonDesignDomain3D**
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**Description**:
In the two-dimensional analysis, define a non-designed area (only valid in two-dimensional analysis).
(This component must be used after generating the mesh.)
**Usage**:
Right-click on **ShowSelElement** to display cells that are not designed, and use cell center points to represent cells.
**Input**:
D: Enter the area of a load. You can input lines, surfaces or closed soilds.
Tol: The tolerance for area determination. This parameter will be invalid when you input closed soilds.
**Output**:
NonD: Output non-design area.
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