=
"Class hierarchy: :class:`freestyle.types.UnaryPredicate1D` > :class:`DensityLowerThanUP1D`\n"
"\n"
".. method:: __init__(threshold, sigma=2.0)\n"
"\n"
" Builds a DensityLowerThanUP1D object.\n"
"\n"
" :arg threshold: The value of the threshold density. Any Interface1D\n"
" having a density lower than this threshold will match.\n"
" :type threshold: float\n"
" :arg sigma: The sigma value defining the density evaluation window\n"
" size used in the :class:`freestyle.functions.DensityF0D` functor.\n"
" :type sigma: float\n"
"\n"
".. method:: __call__(inter)\n"
"\n"
" Returns true if the density evaluated for the Interface1D is less\n"
" than a user-defined density value.\n"
"\n"
" :arg inter: An Interface1D object.\n"
" :type inter: :class:`freestyle.types.Interface1D`\n"
" :return: True if the density is lower than a threshold.\n"
" :rtype: bool\n"