SolidRegionQ

SolidRegionQ[reg] gives True if the 3D region reg is a solid region and False otherwise.

Examples

Ball is solid:

SolidRegionQ[Ball[]]
(* True *)

Sphere is not solid:

SolidRegionQ[Sphere[]]
(* False *)

Cuboid is solid:

SolidRegionQ[Cuboid[]]
(* True *)

Please visit the official Wolfram Language Reference for more details.