Boxing (BOXI)

Components whose GTYPE attribute is TUBE can use BOXI elements to give, for example, implied tube of rectangular cross-section. BOXI elements can be used for modelling ducting, trunking and cable trays.

BOXI has the following particular attributes:

•

PXLE - cross-section X-direction length

•

PZLE - cross-section Z-direction length

•

PAXI - position and orientation of normal to centre of end face

•

TVISI - visibility of top face

•

BVISI - visibility of bottom face

Figure 7:3.

BOXI Catalogue Primitive

When implied tube is drawn using BOXI elements, the Y axis of the implied BOXI is set to the PLeave direction of the preceding component. The X axis of the BOXI is set to be mutually orthogonal to the PLeave and the Z axis of the preceding component (which usually corresponds to the X axis of the component). The Z axis of the BOXI is then derived from its X and Y axes (and usually corresponds to the Z axis of the component).

A 3D Geomset may contain more than one BOXI element and corresponding P-points may be offset in the X or Z directions.

Note:

for Pipework Designers: If there is no preceding component (that is, if the implied BOXI forms the Head of a Branch), the Y axis will be set to the Parrive of the following component (that is, the first component in the Branch). If there are no components, the BOXI will be set to the orientation of the Zone. (Since Pipe and Branch elements have no coordinate system, this is the lowest level in the design hierarchy from which an orientation can be derived.)