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This is a patch from Aras Pranckevicius, D13927. See that patch for full details. On Windows, the many small fprintfs were taking up a large amount of time and significant speedup comes from using snprintf into chained buffers, and writing them all out later. On both Windows and Linux, parallelizing the processing by Object can also lead to a significant increase in speed. The 3.0 splash screen scene exports 8 times faster than the current C++ exporter on a Windows machine with 32 threads, and 5.8 times faster on a Linux machine with 48 threads. There is admittedly more memory usage for this, but it is still using 25 times less memory than the old python exporter on the 3.0 splash screen scene, so this seems an acceptable tradeoff. If use cases come up for exporting obj files that exceed the memory size of users, a flag could be added to not parallelize and write the buffers out every so often.
.. 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.