API Reference > geometry-core > Polyface > PolyfaceQuery > sumTetrahedralVolumes sumTetrahedralVolumes MethodStatic sum volumes of tetrahedra from origin to all facets. if origin is omitted, the first point encountered (by the visitor) is used as origin. If the mesh is closed, this sum is the volume. If the mesh is not closed, this sum is the volume of a mesh with various additional facets from the origin to facets. sumTetrahedralVolumes(source: Polyface | PolyfaceVisitor, origin?: Point3d): number Parameter Type Description source Polyface | PolyfaceVisitor origin Point3d Returns - number Defined in polyface/PolyfaceQuery.ts Line 103 Last Updated: 12 June, 2024