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This attribute exposes mesh vertex normals as a `vertex_normal` attribute for use with nodes. Since the normal vector stored in vertices is only a cache of data computable from the surrounding faces, the attribute is read-only. A proper error message for attempting to write this attribute is part of T85749. A write-only normal attribute will likely come later, most likely called `corner_normal`. The normals are recomputed before reading if they are marked dirty. This involves const write-access to the mesh, protected by the mutex stored in `Mesh_Runtime`. This is essential for correct behavior after nodes like "Edge Split" or nodes that adjust the position attribute. Ref T84297, T85880, T86206 Differential Revision: https://developer.blender.org/D10541
.. 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 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.