SYNOPSIS:
    norm: a common field in Eccet that carries normal information.

DESCRIPTION:
    Many /renderer/s in Eccet require precalculated normal direction
    information to work properly. Therefore each /volume/ usually
    has a /field/ attached to carry this normal information.

    As the normal information is usually not required when segmenting
    or in inner areas this field is normally overloaded with the /grey/
    field (see there).

    The field has a type of (see /fieldtype/) U16, i.e. an unsigned
    short integer with an allowed value range of 0-65535 and is called
    "Norm".

SEE ALSO:
    grey, class, depth
