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The cylinder (RCC), cone (TRC), wedge, box, and ellipsoid are defined by the absolute position of one of the vertices and offset vectors from that point. The offset vectors specified for the wedge and box must be mutually perpendicular. Radii are specified for the sphere and for the circular components of the cylinder and cone.
The arbitrary polyhedron is defined as a list of vertex points and connection information. The user should ensure the 4 points defining a face are coplanar.
A tabular surface body is defined as the volume enclosed by rotating tabulated curve about an axis. A tabular cylinder body is the volume between two parallel planes and the surface swept out by a tabulated curve translated perpendicular to the planes.
Body geometry can be considered as geometric macros representing a predefined combination of surfaces which describe a closed convex volume of space. The primitive (i.e. non tabular) bodies in Sabrina have the further restriction that they are not reentrant. A ray passing through a Sabrina body can have only one point of entry and only one point of exit.
A Sabrina body may be redefined at any time. If the body is used in a zone description, the corresponding zone and cell descriptions will be automatically updated to reflect the redefinition. If the AUTO mode is ON, any change in a body description will result in a new line drawing plot reflecting the updated geometry.