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tetrahedron_volume

EXPRESS specification:

ENTITY tetrahedron_volume
SUBTYPE OF ( volume);
point_1  :  cartesian_point;
point_2  :  cartesian_point;
point_3  :  cartesian_point;
point_4  :  cartesian_point;
WHERE
WRT10  :  point_1.dim = 3;
WRT11  :  above_plane(point_1, point_2, point_3, point_4) <> 0.0 ;
END_ENTITY;

References (1):

Name Type Referred through Express-G
volume Entity
Subtype
No Diagram

Inheritance graph

ENTITY tetrahedron_volume;
ENTITY representation_item;
name  :  label;
ENTITY geometric_representation_item;
DERIVE
dim  :  dimension_count :=  dimension_of(SELF);
ENTITY volume;
ENTITY tetrahedron_volume;
point_1  :  cartesian_point;
point_2  :  cartesian_point;
point_3  :  cartesian_point;
point_4  :  cartesian_point;
END_ENTITY;