how to visualize 3d Map in RViz using Octomap ?

edit

hello I am learning octomap to create 3d maps . I cloned this link into my system and used these steps:

1. rosbag play<my point="" cloud="" file="">
2. cloned link

3. Edited launch file to change remap <cloud_in> to <>

   <launch> <node pkg="octomap_server" type="octomap_server_node" name="octomap_server">

       <!-- fixed map frame (set to 'map' if SLAM or localization running!) -->
       <param name="frame_id" type="string" value="odom_combined" />
   
       <!-- maximum range to integrate (speedup!) -->
       <param name="sensor_model/max_range" value="5.0" />
   
       <!-- data source to integrate (PointCloud2) -->
       <remap from="cloud_in" to="/sensor_msgs/PointCloud2" />
   
   </node>
   

   </launch>

4. catkin_make

5. roslaunch octomap_server octomap_mapping.launch It ran successfully but no output.

Now, i want to see my map created using point cloud data into Rviz. How can i do that ?

SOlutions tried:

Installed rviz-plugin

rostopic echo /sensor_msgs/PoinCloud2
WARNING: topic [/sensor_msgs/PoinCloud2] does not appear to be published yet

after launching file I checked topics list

rostopic list available

/free_cells_vis_array
/occupied_cells_vis_array
/octomap_binary
/octomap_full
/octomap_point_cloud_centers
/octomap_server/parameter_descriptions
/octomap_server/parameter_updates
/projected_map
/rosout
/rosout_agg
/sensor_msgs/PointCloud2
/tf
/tf_static

in my launch file I remapped cloud_in to /octomap_point_cloud_centers then also it was not working then I tried /sensor_msgs/PointCloud2