SYNOPSIS:
    CLASS_FINDCOLOR set [direction] [checkrep]

DESCRIPTION:
    Find the next voxel that carries a color mentionet in set,
    starting at the current view position (which is clipped into
    the volume, if required).
    It seeks towards higher x/y/z coordinates if direction is
    not given or 1, towards lower, if it is -1.
    The current view position is wrapped to the middle of the found
    voxel on return and its coordinates are given in $rc.
    If no voxels are found, view position is unchanged and -1/-1/-1
    is returned.

SEE ALSO:
    CLASS_FILLCONNECTED
