center of bounding coordinates array

[wirmachenbunt]

i struggle with the array ops, i want to calculate the center of the bounding position from the gltf op.
there are two vec3 coords per sphere, i'd like to sum every two bounding coords and divide by 2, hence getting the center of the spheres. there are so many array ops but nothing works for me. i could write a ops but that would defeat the purpose of patching. i write too many ops because i often dont find the right array workflow.

https://cables.gl/edit/dijr0c

summary, i try to get the center of two points in an array

[wirmachenbunt]