=
"Class hierarchy: :class:`freestyle.types.UnaryFunction0D` > "
":class:`freestyle.types.UnaryFunction0DVec3f` > :class:`VertexOrientation3DF0D`\n"
"\n"
".. method:: __init__()\n"
"\n"
" Builds a VertexOrientation3DF0D object.\n"
"\n"
".. method:: __call__(it)\n"
"\n"
" Returns a three-dimensional vector giving the 3D oriented tangent to\n"
" the 1D element to which the :class:`freestyle.types.Interface0D`\n"
" pointed by the Interface0DIterator belongs. The 3D oriented tangent\n"
" is evaluated at the pointed Interface0D.\n"
"\n"
" :arg it: An Interface0DIterator object.\n"
" :type it: :class:`freestyle.types.Interface0DIterator`\n"
" :return: The 3D oriented tangent to the 1D element evaluated at the\n"
" pointed Interface0D.\n"
" :rtype: :class:`mathutils.Vector`\n"