Set-Theoretic Modelling

• Also widely known as computational solid geometry (CSG).
  
• Model is composed of primitive shapes, such as rectangular boxes, spheres, cylinders and cones,
  
• Assembled with set operators
  
• Represent model as a tree structure (Fig. 48).

 

Fig. 48 A set-theoretic model

• Set operators used similar to those of Boolean logic.
  
• Operators used are:
  
  
  • union -- Boolean OR,
    
  • intersection -- Boolean AND,
    
  • difference -- Boolean NOT,

 

Fig. 49 Set operators