@Kévin Dietrich (kevindietrich) I would love to have some quick feedback on this, as it's quite a major feature.
This patch introduces support for an Alembic feature: instancing
- On export: for objects that share their data, the data is written only once. Subsequent writes reference the first object's data.
- On import: mesh and camera instances are properly handled. Once the approach to handle those is fleshed out, we can add support for other types relatively easily.
I've attached a blend file that's suitable for writing instanced mesh data and camera data, but please also test with wild ideas of your own ;-)