Blender Git Loki

Alembic: Limit frame update to only group which we're interested in

The idea is simple: make it so scene_update_for_newframe is only doing updates
of the stuff which is really needed for the currently baking group.

Implementation is a bit tricky since we don't have parent relations after the
DAG is built, so doing some graph traversal there.

This code is also now using simplified version of scene_update_for_newframe()
which means in theory we can try de-duplicating some pieces of code, but that
can be done later.

Additionally, the same approach can be used to optimize motion path calculation.