SYNOPSIS:
    class: a common field in Eccet that carries segmentation information.

DESCRIPTION:
    Many /renderer/s in Eccet can visualize different parts of the
    volume in different colors, if the class /field/ is present.

    The field has a type of (see /fieldtype/) U8, i.e. an unsigned
    byte with an allowed value range of 0-255 and is called "Class".
    The values 0-31 are normally reserved for grey values, while
    32-255 mark surfaces (see /norm/al and /grey/ for an explanation
    of this overloading).

    The field can be allocated using /VOL_ALLOC_CLASS/, if needed.

SEE ALSO:
    grey, norm, depth, VOL_ALLOC_CLASS
