def line_side(start_vector, end_vector, position_vector):
    """
    Find out what side a position_vector is on given a line defined by start_vector and end_vector.
    
    Args:
        start_vector (list): eg. [0,0,0] vector\
        end_vector (list): eg. [0,0,0] vector
        position_vector (list): eg. [0,0,0] vector
        
    Returns:
        float: If positive it's on one side of the line, if negative its on the other side.
    """
    
    return ((end_vector.x - start_vector.x)*(position_vector.y - start_vector.y) - (end_vector.y - start_vector.y)*(position_vector.x - start_vector.x)) > 0