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The issue is caused by the combination of the following factors: - There is a driver from custom property to the subdivision surface modifier. - Active material index tags the ID for the copy-on-write update. Dependency graph currently does not fully distinguish between copy-on-write tag and properties-update tag, so the copy-on-write tag makes the dependency graph believe that it is property which actually affects evaluation has been changed. The simple solution is to treat the active material slot index as an interface data which does not need to trigger copy-on-write tag. The possible downside of this solution is that if someone has a driver from this property the driver will stop working. Whether there is such a real-life setup or not is not clear. Is not something advisable to do anyway. Possible alternative would be to introduce more granularity into the way how property tagging is done. This is something that would be nice to implement eventually, but it is a much bigger refactor. Differential Revision: https://developer.blender.org/D16613
.. 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.