visualize points rviz python

edit

Hello. I am trying to visualize a set o points in rviz. I have a node who subscribes to a topic to get some data and and publishes a Marker msg on a topic.

#!/usr/bin/env python 
import rospy 
from std_msgs.msg import String
import time 
import numpy as np
import math 
from time import sleep 
from laser_line_extraction.msg import LineSegment 
from laser_line_extraction.msg import LineSegmentList 
from box_finder_var import *

from visualization_msgs.msg import Marker 
from geometry_msgs.msg import Quaternion, Pose, Point, Vector3 
from std_msgs.msg import Header, ColorRGBA

rospy.init_node('box_finder', anonymous=True)

marker_publisher = rospy.Publisher('box_visual', Marker, queue_size=100) 
rospy.sleep(1)

def callback(data):

    # calculate some points...

    ### Visualize the L-shape elements in rviz ###

    show_points_in_rviz(marker_publisher)

def show_points_in_rviz(marker_publisher):
    marker = Marker(
                ns='box_finder',
                type=Marker.POINTS,
                action=Marker.ADD,
                id=0,
                lifetime=rospy.Duration(),
                pose=Pose(Point(1.5, 1.5, 0.0), Quaternion(0, 0, 0, 1)),
                scale=Vector3(0.5, 0.5, 0.0),
                header=Header(frame_id='base_link'),
                color=ColorRGBA(0.0, 0.0, 1.0, 0.8),
                # lifetime=0,
                frame_locked=False)
    marker_publisher.publish(marker)

def box_finder():

    rospy.Subscriber("/line_segments", LineSegmentList, callback)
    rospy.spin()

if __name__ == '__main__':
    box_finder()

When I run the node I check with rostopic echo what is published and I see this:

But when I add the Marker element in rviz I don't see any point there. It's clear that I'm missing something here. Can anyone help or give a hint?

I use Ubuntu 16.04, ROS kinetic, gazebo 7

Thank you in advance!