def fill_grid(span: int=1, offset: int=0, use_interp_simple: bool=False):
    """Fill grid from two loops 

    :param span: Span, Number of sides (zero disables) 
    :type span: int
    :param offset: Offset, Number of sides (zero disables) 
    :type offset: int
    :param use_interp_simple: Simple Blending 
    :type use_interp_simple: bool
    """
    pass
