Union

Learning targets

• Use Boolean operation to form union of two objects

This example unites two circles by means of the Boolean union operator.

Surely, we could also create this geometry by a simple overlay. However, a Boolean operation allows to apply shape manipulating operations such as corner rounding to the resulting shape.

.jcm Input File

• layout.jcm [ASCII]

  Layout2D {  
    UnitOfLength = 1  
    Objects {
      Parallelogram {
        Priority = ComputationalDomain
        DomainId = 1
        BoundingBox {
          Offset = [1 1 1 1]
        }
      }
      
      BooleanOperation {
        DomainId = 2 
        Operator = Union
        A { 
          Circle {
            Radius = 6
            GlobalPosition = [-4.0 0.0]
            RefineAll = 2
          }
        }
        
        B {
          Circle {
            Radius = 4
            GlobalPosition = [1.75 0.0]
            RefineAll = 2
          }
        }
      }
    }  
  }
  

To apply a corner rounding we add the following definitions

BooleanOperation {
  A {
    ...
  }
  B {
    ...
  }
  CornerRounding {
    Radius = 0.5
    MaxAngle = 140
    NPoints = 5
  }
}

which yields the following geometry