Man pages matching name pcl_openni_planar_convex_hull in section 1:

pcl_openni_planar_convex_hull.1.en	debian 10 / pcl-tools
pcl_openni_planar_convex_hull.1.en	debian 11 / pcl-tools
pcl_openni_planar_convex_hull.1.en	debian 12 / pcl-tools