SYNOPSIS:

FILTB_NLG sx sy sz sw [fx] [fy] [fz]

DESCRIPTION:

Do a nonlinear gaussian filtering into the backbuffer (B).

SEE ALSO:

FILTB_NLC, FILTB_NLC2, FILTB_NLD, NLGS,
backingstore, COPY_BACKTOGREY, XCHG_GREYANDBACK, ERASE_BACK