CG_MakeSolid — Cast the geometry into a solid. No check is performed. To obtain a valid solid, the input geometry must be a closed Polyhedral Surface or a closed TIN.
geometry CG_MakeSolid(geometry geom1);
Availability: 3.5.0
            
 Questo metodo richiede il backend SFCGAL. 
            
 Questa funzione supporta il 3d e non distrugge gli z-index. 
            
 Questa funzione supporta le Polyhedral Surface. 
            
 Questa funzione supporta i Triangoli e le Triangulated Irregular Network Surfaces (TIN).