i would parse your mesh into smaller sections, and use a jit.gl.mesh for each section. that will make it easier to isolate the relevant section (proximity to the camera), and should make updating the relevant section easier. you will have to manage the date yourself, e.g. keeping the "seams" joined (by sending duplicate data for those vertices).

That's smart ! But I'd need to have a pre calculated / planned camera path no ?

I'd like to be able to make the camera "flying" randomly, slowly, around the structure

not sure why that would make a difference to what you're asking

Not sure I understood it well, so. I guess the idea is to have a "kind of" octree of the space and depending where my cam is, to alter the part of space.

Thanks for your answer. I'll try this.