(SET-FILL-PATTERN fill-pattern color)

This call is similar to SET-FILL-STYLE, except that it sets a user-defined pattern instead of a predefined one. A fill-pattern is an 8x8 matrix used to fill surfaces; at the PCSCHEMElevel, it is a list of 8-bit integers, each coding one row. Normally there will be 8 elements in the list but if you put less, PCS will assume you want to repeat periodically the given ones. For example, the chain pattern
(SET-FILL-PATTERN '(#b01000100
#b00111000
#b01000100
#b01000100
#b01000100
#b00111000
#b01000100
#b01000100) {\itt 'BLUE})
will produce the same result as
(SET-FILL-PATTERN '(#b00111000
#b01000100
#b01000100
#b01000100) {\itt 'BLUE})