Octomap in moveit is like a mass.

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I use this 3D Perception tutorial to input octomap to moveit. But the octomap in moveit is like a mass. Octomap just generated in a constant area. Here is the picture of fail octomap. I read some article also tutorial of TF. I think maybe i should add TF between /map to /odom. But i just have concept of TF. I don't know how to do it. Or maybe i am wrong,i don't need TF? By the way,I just know the concept of /map -> /odom -> /base_link,but i don't know how to achieve. Could anyone help me. I am very new in ROS. Any help would be great.