SYNOPSIS:
    SPLINE_CMARK from to zstart zend [steps] [name]

DESCRIPTION:
    Remark classes near the spline surface.
    This will remark a thick surface starting at the spline
    surface plus zstart times the spline normal, and ending
    at surface plus zend times the normal.

SEE ALSO:
    spline, MARKCC, SPLINE_MARK
