Question about features

I have a segmentation, A 3d array where every value is an integer that corresponds to an object.

Something like this, but in 3d:

I'm interested in either generating meshes for all objects in one pass thru the array, or generating the meshes of one object at the time by using some tree structure so it is fast enogh ( most objects occupies a very small volume, but have a very large bounding box).

Does OpenVDB has any implemantion that could be useful for this?

Start by reviewing OpenVDB's existing mesh-generation and tree-structure APIs against the described 3D integer segmentation. Determine whether they support processing all labeled objects or one object at a time efficiently, and document the applicable implementation or the missing feature; no source files or tests are identified in the issue.

Written by the indexing model from the issue text.