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Some runtime data that stores which sockets can be fields and which can't is not stored in the file, but only calculated when necessary. When opening a file, the node tree update function was called, which recalculated this data, but that was explicily turned off for undo. This exposes a fundamental issue with undo, the ID caching system for undo, and how it relates to node trees in particular. Ideally this call couldn't be necessary at all. In the future it could be removed by adding a runtime struct to node trees, and calculating its contents on-demand instead of preemtively. Differential Revision: https://developer.blender.org/D12699
.. 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.