may you add some comment in the header?

[yeliu-deepmirror]

It will be clearer to have more comment (as in cuda-pcl).

while in cuda-octree it is harder. I found the distance result for approxNearestSearch is 1e9 times the real sqr_distance. but for radiusSearch it is directly the result.

[Haoyu-NV]

Will do, thx