ST_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 ST_MakeSolid(geometry geom1);
                 
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                 ST_MakeSolid is deprecated as of 3.5.0. Use CG_MakeSolid instead.  | 
            
Availability: 2.2.0
            
            This method needs SFCGAL backend.
        
            
            This function supports 3d and will not drop the z-index.
        
            
            This function supports Polyhedral surfaces.
        
            
            This function supports Triangles and Triangulated Irregular Network Surfaces (TIN).