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The importer parts that were doing assignment of materials to the imported objects/meshes were essentially having a quadratic complexity in terms of scene object count. For each material assigned to each object, they were scanning the whole scene, checking which other Objects use the same Mesh data, in order to resize their material arrays to match the size. Performance details (Windows, Ryzen 5950X): - Import OBJ Blender 3.0 splash scene (24k objects): 43.0s -> 32.9s - Import USD Disney Moana scene (260k objects): saves two hours (~7400s). Note that later on this crashes when trying to render the imported result; crashes in the same way/place both in master and this patch. Implementation details: The importers were doing "scan the world" basically twice for each object, for each material: once when creating a new material slot (assigns an empty material), and then again when assigning the material. However, all these importers (USD, Alembic, OBJ) always create one Object for one Mesh. So that whole quadratic complexity resulting from "scan the world for possible other users of this obdata" is completely not needed; it just never finds anything. So add a new dedicated function BKE_object_material_assign_single_obdata that skips the expensive part, but should only be used when the caller knows that the obdata has exactly one user (the passed object). Reviewed By: Bastien Montagne, Michael Kowalski Differential Revision: https://developer.blender.org/D15145
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.