Reference/Release Notes/3.3/Pipeline Assets IO

= Pipeline, Assets & I/O =

General

 * Improved performance when importing USD, Alembic, OBJ files with massive amounts of objects . Importing a production USD scene with 260 thousand objects went from 3.5 hours down to 1.5 minutes.

Alembic

 * The export operator can now have presets

OBJ

 * Importer and exporter support .obj vertex colors now . Importer can import both "xyzrgb" and "#MRGB" vertex color formats; exporter optionally writes "xyzrgb" format.
 * The Python based OBJ importer/exporter is marked as "legacy" in the menu item now; the new C++ based one got "experimental" label removed. Addons using `bpy.ops.import_scene.obj` and `bpy.ops.export_scene.obj` APIs are strongly encouraged to switch to `bpy.ops.wm.obj_import` and `bpy.ops.wm.obj_export`.

STL

 * New experimental STL (.stl) importer . The new importer is written in C++ and is about 8 times faster than the Python importer.

USD

 * OpenVDB volumes can now be exported to USD.

glTF 2.0
glTF I/O is an python addon, change logs can be retrieved on Addon page