octomap laser scannaer + kinect [closed]

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hi,

i ve build a system(ros groovy) with a kinect and laserscanner. i can create maps also just with kinect or hokuyo scanner( converted laser scans to pcl2).

I gave same publish topic names to my pcl2 topics at kinect and laser scanner, octomap can subscribe at the moment. but topics can not be subscribed at the same time. is there any way to make it simultaneously or should i assemble both pcl2 topics before i subscribe it to octomap ?