Representation of SCTN/GENSEC Ends

The DRGP (Drawing Priority) SCTN/GENSEC attribute is used by Draw to determine how to draw SCTN/GENSEC ends in hidden-lines-removed views. DRGP can be set (in the Design Database) to any integer value between 0 (highest priority) and 50.

The illustration indicates plan views of four GENSECs meeting at a node point. The top flanges of the GENSECs are coplanar and none of the GENSEC ends have been cut back.

(a) the DRGP attributes of all four GENSECs have been left at 0; as a result Draw is unable to determine how to draw the intersection lines between the GENSECs and so draws the full outlines of all GENSECs.

(b) the DRGP attributes of the four GENSECs have been set as indicated, which confers a priority order on them. As a result, Draw is able to determine the representation that is intended.

Note:
Using this functionality in non-orthogonal Views can produce slightly distorted results. When producing the graphics, the SCTNs /GENSECs are 'shifted' slightly in the View direction by an amount relative to the SCTN's/GENSECs DRGP value to allow the hidden-line-removal code to function. Distortion is especially likely to be noticed if large values of DRGP are used. It is recommended that DRGP values are kept as small as possible and preferably less than 10.