Drawing Gridlines

Plant Design grids (GRIDSYstem and GRIDAXis elements) may now be added to IDLists, but may not be the sole member of the IDList. They are drawn using the Centreline Style/Colour; their GRIDLNs are considered to be of infinite length and so are extended to the VIEW boundary. AUTO commands ignore these elements when calculating the VSCA, THPOS, and SIZE attributes of a VIEW.

For details, please refer to the DRAFT User Guide, section 4.2, 4.3 and 12.9.