CloudCompare forum

Hello,

I have a question regarding the calculation of bounding box dimensions and the resulting octree levels.

- In my understanding, the bounding box dimensions represent the maximum values of either the x, y, or z coordinate distance of a point cloud. Is that correct?

-As mentioned on the CC Wiki, octree cells are formed by dividing cubes into 8 equivalent sub-cubes from an initial box. By default, octree subdivision is initiated from the square bounding box of a cloud. Does that mean that, by default, the octree distance can be manually calculated as the maximum dimensions of a cloud (x, y, or z) divided by 2 to the power of the octree level? For example, if the distance between the xmin and xmax values equals 10 m and is the biggest dimension of a certain PC, does that mean that the octree distance of octree level 1 equals 10/(2^1)=5 m?

I didn't find any explanation on that. I did some testing by manually calculating the octree distance and came pretty close to the calculation results of CC, but it was not the exact same value.

Best regards,
Michael

I think you answered all of your question.

bounding box correct

number of box = 2^octreeLevel, and each box has the same size. so if you know the bbbeforehand you can calculate the resulting octree box size.